These are representative sample records from Science.gov related to your search topic.
For comprehensive and current results, perform a real-time search at Science.gov.
1

An N-Bit Digitally Variable Ultra Wideband Pulse Generator for GPR and UWB Applications  

E-print Network

An N-Bit Digitally Variable Ultra Wideband Pulse Generator for GPR and UWB Applications Sertac has found military applications such as ground penetrating radar (GPR), wall penetrating radar, secure are generated and the generated time pulses may span of a few GHz bandwidth. It is mostly preferred in the GPR

Yanikoglu, Berrin

2

Ultra Wideband (UWB) communication vulnerability for security applications.  

SciTech Connect

RF toxicity and Information Warfare (IW) are becoming omnipresent posing threats to the protection of nuclear assets, and within theatres of hostility or combat where tactical operation of wireless communication without detection and interception is important and sometimes critical for survival. As a result, a requirement for deployment of many security systems is a highly secure wireless technology manifesting stealth or covert operation suitable for either permanent or tactical deployment where operation without detection or interruption is important The possible use of ultra wideband (UWB) spectrum technology as an alternative physical medium for wireless network communication offers many advantages over conventional narrowband and spread spectrum wireless communication. UWB also known as fast-frequency chirp is nonsinusoidal and sends information directly by transmitting sub-nanosecond pulses without the use of mixing baseband information upon a sinusoidal carrier. Thus UWB sends information using radar-like impulses by spreading its energy thinly over a vast spectrum and can operate at extremely low-power transmission within the noise floor where other forms of RF find it difficult or impossible to operate. As a result UWB offers low probability of detection (LPD), low probability of interception (LPI) as well as anti-jamming (AJ) properties in signal space. This paper analyzes and compares the vulnerability of UWB to narrowband and spread spectrum wireless network communication.

Cooley, H. Timothy

2010-07-01

3

Rat electrocardiogram during acute exposure to synchronized bursts of ultra-wideband pulses  

Microsoft Academic Search

Rats under ketamine anesthesia were exposed to bursts of ultra-wideband (UWB) electromagnetic pulses at two different times during the electrocardiogram (ECG) to investigate possible changes in the ECG immediately after start of exposure. Animals were exposed to UWB pulses in a giga transverse electromagnetic cell (GTEM) with the body axis parallel to the direction of UWB propagation (k-polarization) or the

Ronald L. Seaman; James R. Jauchem

2004-01-01

4

Ultra-wideband (UWB) communication link modeling and characterization  

Microsoft Academic Search

This paper introduces modeling of a ultra-wideband (UWB) communication link, using two monopole antennas, in terms of the singularity expansion method (SEM) via Prony's method. Prony's Method is used to extract poles and residues of the link. By obtaining the poles and residues of the link it is possible to construct a transfer function of the link in both time

Stanislav Licul; William A. Davis; Warren L. Stutzman

2003-01-01

5

Pulse-based ultra-wideband transmitters for digital communication  

E-print Network

Ultra-wideband radio (UWB) is a rapidly developing wireless technology that promises unprecedented data rates for short-range commercial radios, combined with precise locationing and high energy efficiency. These benefits ...

Wentzloff, David D. (David Dale), 1977-

2007-01-01

6

A PPM GAUSSIAN PULSE GENERATOR FOR ULTRA-WIDEBAND COMMUNICATIONS  

E-print Network

A PPM GAUSSIAN PULSE GENERATOR FOR ULTRA-WIDEBAND COMMUNICATIONS Sumit Bagga1 , Giuseppe de Vita2, Pisa, Italy Email: gi.devita@tiscali.it ABSTRACT A Gaussian pulse generator incorporating a pulse position modulator for use in an ultra-wideband or impulse radio system is described. The pulse generator

Serdijn, Wouter A.

7

Microwave (De) Multiplexer for Ultra-Wideband (UWB) Non-Coherent High Data Rates Transceiver  

Microsoft Academic Search

The following topics are dealt with: low-loss planar multiplexer\\/demultiplexers; ultra-wideband high data rate (UWB HDR) transceivers; impulse radio; microstrip passive quadriplexers; 2nd order filters and open-loop resonators

St閜hane Mall間ol; Jean-Philippe Coupez; Christian Person; Thomas Lespagnol; St閜hane Paquelet; Alexis Bisiaux

2006-01-01

8

Ultra-Wideband Imaging Systems for Breast Cancer Detection  

E-print Network

Ultra-Wideband Imaging Systems for Breast Cancer Detection Hossein Kassiri Bidhendi, Hamed Mazhab system design and its advantages for breast cancer detection after reading this chapter. Keywords Breast cancer detection 路 Breast imaging 路 Ultra-wideband imaging 路 UWB transceiver 路 UWB pulsesUWB

Genov, Roman

9

Ultra-wideband short-pulse radar with range accuracy for short range detection  

DOEpatents

An ultra-wideband (UWB) radar transmitter apparatus comprises a pulse generator configured to produce from a sinusoidal input signal a pulsed output signal having a series of baseband pulses with a first pulse repetition frequency (PRF). The pulse generator includes a plurality of components that each have a nonlinear electrical reactance. A signal converter is coupled to the pulse generator and configured to convert the pulsed output signal into a pulsed radar transmit signal having a series of radar transmit pulses with a second PRF that is less than the first PRF.

Rodenbeck, Christopher T; Pankonin, Jeffrey; Heintzleman, Richard E; Kinzie, Nicola Jean; Popovic, Zorana P

2014-10-07

10

Ultra-wideband (UWB) bandpass filters using multiple-mode resonator  

Microsoft Academic Search

A novel microstrip-line ultra-wideband (UWB) bandpass filter is proposed and implemented using a multiple-mode resonator (MMR), aiming at transmitting the signals in the whole UWB passband of 3.1-10.6GHz. In the design, the first three resonant frequencies of this MMR are properly adjusted to be placed quasiequally within the UWB. Then, the parallel-coupled lines at the two sides are longitudinally stretched

Lei Zhu; Sheng Sun; Wolfgang Menzel

2005-01-01

11

Power line communications (PLC) using impulse ultra wideband (UWB) in a microprocessor had been  

E-print Network

Abstract Power line communications (PLC) using impulse ultra wideband (UWB) in a microprocessor had microprocessor increases rapidly and seemingly without bound, testing and debug strategies have to be constantly these variations on a microprocessor die, most of the test circuits are either removed once the chip is deployed

Ha, Dong S.

12

Development of an ultra wideband ground penetrating radar (UWB GPR) for nondestructive testing of underground objects  

Microsoft Academic Search

A compact ground penetrating radar (GPR) using an impulse waveform is developed. The UWB GPR system is composed of an impulse generator, ultra wideband transmitting and receiving antennas, high speed digitizer, and a laptop computer for data storage and image processing. By considering the maximum measuring depth and soil properties, a proper impulse generator is made and then a novel

Younp-Jin Park; Sung-Bae Cho; Kwan-Ho Kim; Dong-Gi Youn

2004-01-01

13

Microwave (De)Multiplexer for Ultra-Wideband (UWB) Non-Coherent High Data Rates Transceiver  

Microsoft Academic Search

This paper deals with the investigation of a low-loss planar multiplexer\\/demultiplexer with adjacent frequency bands for the implementation of an ultra-wideband high data rates (UWB HDR) transceiver (3.1-10.6 GHz) based on impulse radio. A 3.1-4.25 GHz microstrip passive quadriplexer built upon 2nd order filters using open-loop resonators is first designed and implemented to initiate the transceiver prototype, as well as

St閜hane Mall間ol; Jean-Philippe Coupez; Christian Person; Thomas Lespagnol; St閜hane Paquelet; Alexis Bisiaux

2006-01-01

14

Clutter reduction methods in ultra wideband (UWB) radar and time\\/performance evaluation on ARM processors  

Microsoft Academic Search

In this study, principal component analysis (PCA), singular value decomposition (SVD) and independent component analysis (ICA), which are statistical signal processing methods for clutter reduction, are explained in ultra wideband (UWB) radars. In addition, how to use these methods in through wall imaging (TWI) and time\\/performance relationship on ARM Cortex A-8 processors which have floating-point mathematical operation support is examined

E. Ozturk; A. V. Atli; M. S. Mercan; A. Caliskan; I. Y. Erer

2012-01-01

15

Hyperactivity caused by a nitric oxide synthase inhibitor is countered by ultra-wideband pulses.  

PubMed

Potential action of ultra-wideband (UWB) electromagnetic field pulses on effects of N(G)-nitro- L-arginine methyl ester (L-NAME), an inhibitor of nitric oxide synthase (NOS), on nociception and locomotor activity was investigated in CF-1 mice. Animals were injected IP with saline or 50 mg/kg L-NAME and exposed for 30 min to no pulses (sham exposure) or UWB pulses with electric field parameters of 102+/-1 kV/m peak amplitude, 0.90+/-0.05 ns duration, and 160+/-5 ps rise time (mean+/-S.D.) at 600/s. Animals were tested for thermal nociceptive responses on a 50 degrees C surface and for spontaneous locomotor activity for 5 min. L-NAME by itself increased mean first-response (paw lift, shake, or lick; jump) and back-paw-lick response latencies and mean locomotor activity. Exposure to UWB pulses reduced the L-NAME-induced increase in back-paw-lick latency by 22%, but this change was not statistically significant. The L-NAME-induced hyperactivity was not present after UWB exposure. Reduction and cancellation of effects of L-NAME suggest activation of opposing mechanism(s) by the UWB pulses, possibly including increase of nitric oxide production by NOS. The action, or actions, of UWB pulses appears to be more effective on locomotor activity than on thermal nociception in CF-1 mice. PMID:10495308

Seaman, R L; Belt, M L; Doyle, J M; Mathur, S P

1999-10-01

16

Ultra-wideband transmitter research  

Microsoft Academic Search

The generation of ultra-wideband (UWB) pulses is a challenging problem that involves generating pulses with fast rise times on the order of 100 ps and voltages of more than 500 kV. Pulsewidths from 130 ps to a few nanoseconds (ns) are possible. A critical step involves switching high voltages with precision. The use of both gas and oil for the

Forrest J. Agee; Carl E. Baum; William D. Prather; Jane M. Lehr; J. P. O'Loughlin; J. W. Burger; J. S. H. Schoenberg; D. W. Scholfield; R. J. Torres; J. P. Hull; J. A. Gaudet

1998-01-01

17

Photonic generation of ultra-wideband pulses using a fiber delay interferometer  

NASA Astrophysics Data System (ADS)

We demonstrate a novel scheme to generate ultra wideband (UWB) doublet pulses by inputting a dark return-to-zero (RZ) signal into a fiber delay interferometer (FDI). When a dark RZ pulse train with a repetition rate of 0.625 GHz and a pulse width of 120 ps was inputted into a FDI with a free spectrum range (FSR) of 0.16 nm (~20 GHz, according time delay is ~50 ps) and an extinction ratio (ER) of 9 dB, by adjusting the control temperature of the FDI, the phase difference of the input light on the both fiber arms of the FDI is changed and controlled, UWB doublet pulse is directly generated at the output port of the FDI. The system parameters effects on the output signal were also discussed. Moreover, we numerically demonstrated that, by carefully optimizing system parameters, UWB quadruplet pulses also can be generated. This scheme has some distinct advantages including easy integration, convenient tuning, good stability, and so on. Presented method also accords with the general features in future applied UWB system, namely, single optical source input, simple configuration and passive device.

Wang, Fei; Zhang, Xinliang; Zhang, Yin; Xu, Enming

2011-11-01

18

Photonic generation of ultra-wideband pulses using a fiber delay interferometer  

NASA Astrophysics Data System (ADS)

We demonstrate a novel scheme to generate ultra wideband (UWB) doublet pulses by inputting a dark return-to-zero (RZ) signal into a fiber delay interferometer (FDI). When a dark RZ pulse train with a repetition rate of 0.625 GHz and a pulse width of 120 ps was inputted into a FDI with a free spectrum range (FSR) of 0.16 nm (~20 GHz, according time delay is ~50 ps) and an extinction ratio (ER) of 9 dB, by adjusting the control temperature of the FDI, the phase difference of the input light on the both fiber arms of the FDI is changed and controlled, UWB doublet pulse is directly generated at the output port of the FDI. The system parameters effects on the output signal were also discussed. Moreover, we numerically demonstrated that, by carefully optimizing system parameters, UWB quadruplet pulses also can be generated. This scheme has some distinct advantages including easy integration, convenient tuning, good stability, and so on. Presented method also accords with the general features in future applied UWB system, namely, single optical source input, simple configuration and passive device.

Wang, Fei; Zhang, Xinliang; Zhang, Yin; Xu, Enming

2012-02-01

19

Ultra-wideband receiver  

DOEpatents

An ultra-wideband (UWB) receiver utilizes a strobed input line with a sampler connected to an amplifier. In a differential configuration, .+-.UWB inputs are connected to separate antennas or to two halves of a dipole antenna. The two input lines include samplers which are commonly strobed by a gating pulse with a very low duty cycle. In a single ended configuration, only a single strobed input line and sampler is utilized. The samplers integrate, or average, up to 10,000 pulses to achieve high sensitivity and good rejection of uncorrelated signals.

McEwan, Thomas E. (Livermore, CA)

1996-01-01

20

Ultra-wideband receiver  

DOEpatents

An ultra-wideband (UWB) receiver utilizes a strobed input line with a sampler connected to an amplifier. In a differential configuration, .+-.UWB inputs are connected to separate antennas or to two halves of a dipole antenna. The two input lines include samplers which are commonly strobed by a gating pulse with a very low duty cycle. In a single ended configuration, only a single strobed input line and sampler is utilized. The samplers integrate, or average, up to 10,000 pulses to achieve high sensitivity and good rejection of uncorrelated signals.

McEwan, Thomas E. (Livermore, CA)

1994-01-01

21

Ultra-wideband receiver  

DOEpatents

An ultra-wideband (UWB) receiver utilizes a strobed input line with a sampler connected to an amplifier. In a differential configuration, [+-] UWB inputs are connected to separate antennas or to two halves of a dipole antenna. The two input lines include samplers which are commonly strobed by a gating pulse with a very low duty cycle. In a single ended configuration, only a single strobed input line and sampler is utilized. The samplers integrate, or average, up to 10,000 pulses to achieve high sensitivity and good rejection of uncorrelated signals. 16 figs.

McEwan, T.E.

1994-09-06

22

Ultra-wideband receiver  

DOEpatents

An ultra-wideband (UWB) receiver utilizes a strobed input line with a sampler connected to an amplifier. In a differential configuration, {+-}UWB inputs are connected to separate antennas or to two halves of a dipole antenna. The two input lines include samplers which are commonly strobed by a gating pulse with a very low duty cycle. In a single ended configuration, only a single strobed input line and sampler is utilized. The samplers integrate, or average, up to 10,000 pulses to achieve high sensitivity and good rejection of uncorrelated signals. 21 figs.

McEwan, T.E.

1996-06-04

23

Emerging Communication Technologies (ECT) Phase 2 Report. Volume 3; Ultra Wideband (UWB) Technology  

NASA Technical Reports Server (NTRS)

The Emerging Communication Technology (ECT) project investigated three First Mile communication technologies in support of NASA s Second Generation Reusable Launch Vehicle (2nd Gen RLV), Orbital Space Plane, Advanced Range Technology Working Group (ARTWG) and the Advanced Spaceport Technology Working Group (ASTWG). These First Mile technologies have the purpose of interconnecting mobile users with existing Range Communication infrastructures. ECT was a continuation of the Range Information System Management (RISM) task started in 2002. RISM identified the three advance communication technologies investigated under ECT. These were Wireless Ethernet (Wi-Fi), Free Space Optics (FSO), and Ultra Wideband (UWB). Due to the report s size, it has been broken into three volumes: 1) Main Report 2) Appendices 3) UWB

Bastin, Gary L.; Harris, William G.; Chiodini, Robert; Nelson, Richard A.; Huang, PoTien; Kruhm, David A.

2003-01-01

24

Lack of effects on heart rate and blood pressure in ketamine-anesthetized rats briefly exposed to ultra-wideband electromagnetic pulses  

Microsoft Academic Search

Fourteen Sprague-Dawley rats were exposed to pulses produced by a Bournlea ultra-wideband (UWB) pulse generator (rise time, 318-337 ps; maximum E field, 19-21 kV\\/m). Exposures at a repetition frequency of 1 kHz for 0.5 s or to repetitive pulse trains (2-s exposure periods alternating with 2 s of no exposure, for a total of 2 min) resulted in no significant

James R. Jauchem; Melvin R. Frei; Kathy L. Ryan; James H. Merritt; Michael R. Murphy

1999-01-01

25

Model-based sub-Nyquist sampling and reconstruction technique for ultra-wideband (UWB) radar  

NASA Astrophysics Data System (ADS)

The Army Research Lab has recently developed an ultra-wideband (UWB) synthetic aperture radar (SAR). The radar has been employed to support proof-of-concept demonstration for several concealed target detection programs. The radar transmits and receives short impulses to achieve a wide-bandwidth from 300 MHz to 3000 MHz. Since the radar directly digitizes the wide-bandwidth receive signals, the challenges is to how to employ relatively slow and inexpensive analog-to-digital (A/D) converters to sample the signals with a rate that is greater than the minimum Nyquist rate. ARL has developed a sampling technique that allows us to employ inexpensive A/D converters (ADC) to digitize the widebandwidth signals. However, this technique still has a major drawback due to the longer time required to complete a data acquisition cycle. This in turn translates to lower average power and lower effective pulse repetition frequency (PRF). Compressed Sensing (CS) theory offers a new approach in data acquisition. From the CS framework, we can reconstruct certain signals or images from much fewer samples than the traditional sampling methods, provided that the signals are sparse in certain domains. However, while the CS framework offers the data compression feature, it still does not address the above mentioned drawback, that is the data acquisition must be operated in equivalent time since many global measurements (obtained from global random projections) are required as depicted by the sensing matrix ? in the CS framework. In this paper, we propose a new technique that allows the sub-Nyquist sampling and the reconstruction of the wide-bandwidth data. In this technique, each wide-bandwidth radar data record is modeled as a superposition of many backscatter signals from reflective point targets. The technique is based on direct sparse recovery using a special dictionary containing many time-delayed versions of the transmitted probing signal. We demonstrate via simulated as well as collected data that our design offers real-time (with single observation as oppose to equivalent-time with many observations) data acquisition of the wide-bandwidth radar signals using the sub-Nyquist sampling rate.

Nguyen, Lam; Tran, Trac D.

2010-04-01

26

Lack of effects on heart rate and blood pressure in ketamine-anesthetized rats briefly exposed to ultra-wideband electromagnetic pulses.  

PubMed

Fourteen Sprague-Dawley rats were exposed to pulses produced by a Bournlea ultra-wideband (UWB) pulse generator (rise time, 318-337 ps; maximum E field, 19-21 kV/m). Exposures at a repetition frequency of 1 kHz for 0.5 s or to repetitive pulse trains (2-s exposure periods alternating with 2 s of no exposure, for a total of 2 min) resulted in no significant changes in heart rate or mean arterial blood pressure. These results suggest that acute whole-body exposure to UWB pulses does not have a detrimental effect on the cardiovascular system. PMID:9919833

Jauchem, J R; Frei, M R; Ryan, K L; Merritt, J H; Murphy, M R

1999-01-01

27

A technique for the extraction of ultra-wideband (UWB) signals concealed in frequency band folded responses  

NASA Astrophysics Data System (ADS)

Ultra-wideband (UWB) excitation sources in radar systems have allowed for enhancement in capabilities such as target spectral response, clutter suppression, and range resolution. While generation of generic UWB signals has become easily achievable, direct acquisition, or digitization, of these bandwidths (>= 4 GHz) is not. To account for this, many UWB radar systems implement a single or multi-stage band folding technique in the receiver hardware chain which allows for the direct digitization of the UWB waveform at a smaller bandwidth (e.g., 4 GHz into 1 GHz). While the lower bandwidth allows for larger than narrowband capabilities, it reduces desired features such as range resolution (e.g., 3.75 cm to 15 cm). In an effort to address this problem, and allow for utilization of full bandwidth of an UWB waveform, this paper presents a signal processing technique which utilizes hardware band folding to wrap a spectrally unique UWB multi-tone waveform into a lower frequency, lower bandwidth signal allowing for both direct digitization and conservation of UWB features. The signal processing technique utilizes the multi-tone waveform to generate an UWB signal composed of sections whose separate spectral peaks fold into the inner ?F regions of the previous band. It will be shown, that through reassignment of these peaks, as well as the phase, to the individual frequencies, the intended UWB capabilities can be restored.

Vela, Russell; Narayanan, Ram M.; Erisman, David

2011-06-01

28

Ultra-wideband electromagnetic pulses: lack of effects on heart rate and blood pressure during two-minute exposures of rats.  

PubMed

Exposure to fast-rise-time ultra-wideband (UWB) electromagnetic pulses has been postulated to result in effects on biological tissue (including the cardiovascular system). In the current study, 10 anesthetized Sprague-Dawley rats were exposed to pulses produced by a Sandia UWB pulse generator (average values of exposures over three different pulse repetition rates: rise time, 174-218 ps; peak E field, 87-104 kV/m; pulse duration, 0.97-0.99 ns). Exposures to 50, 500 and 1000 pulses/s resulted in no significant changes in heart rate or mean arterial blood pressure measured every 30 s during 2 min of exposure and for 2 min after the exposure. The results suggest that acute UWB whole-body exposure under these conditions does not have an immediate detrimental effect on these cardiovascular system variables in anesthetized rats. PMID:9669547

Jauchem, J R; Seaman, R L; Lehnert, H M; Mathur, S P; Ryan, K L; Frei, M R; Hurt, W D

1998-01-01

29

Photonic generation of background-free millimeter-wave ultra-wideband pulses based on a single dual-drive Mach-Zehnder modulator.  

PubMed

We propose a novel photonic approach for generating a background-free millimeter-wave (MMW) ultra-wideband (UWB) signal based on a conventional dual-drive Mach-Zehnder modulator (DMZM). One arm of the DMZM is driven by a local oscillator (LO) signal. The LO power is optimized to realize optical carrier suppressed modulation. The other arm is fed by a rectangular signal. The MMW UWB pulses are generated by truncating the continuous wave LO signal into a pulsed one in a photodetector (PD). The generated MMW UWB signal is background-free by eliminating the baseband frequency components because the optical power launched to the PD keeps constant all the time. The proposed method is theoretically analyzed and experimentally verified. The generated MMW UWB signal centered at a frequency of 26 GHz meets the Federal Communications Commission spectral mask very well. PMID:24690706

Li, Wei; Wang, Wen Ting; Sun, Wen Hui; Wang, Li Xian; Zhu, Ning Hua

2014-03-01

30

A platform for ultra wideband communication systems  

E-print Network

In this thesis, a web interface for sending and receiving data across an actual UWB channel was designed. In addition, a platform for Ultra Wideband (UWB) communication development was implemented. The UWB communication ...

Ackerman, Nathan (Nathan Joseph)

2005-01-01

31

A 0.17-nJ/Pulse IR-UWB Receiver Based on Distributed Pulse Correlator in 0.18-m Digital CMOS  

E-print Network

A 0.17-nJ/Pulse IR-UWB Receiver Based on Distributed Pulse Correlator in 0.18-碌m Digital CMOS@ece.rochester.edu Abstract-- This paper presents a low power impulse-radio ultra-wideband (IR-UWB) receiver based and circuit complexity of the analog correlation receiver. A chip prototype of the IR-UWB receiver

Wu, Hui

32

Ultra wideband surface wave communications  

NASA Astrophysics Data System (ADS)

Ultra Wideband (UWB), an impulse carrier waveform, was applied at HF-VHF frequencies to utilize surface wave propagation. UWB involves the propagation of transient pulses rather than continuous waves which makes the system easier to implement, inexpensive, low power and small. Commercial UWB for wireless personal area networks is 3.1 to 10.6 GHz band as approved by the FCC with ranges up to 12 ft. The use of surface wave propagation (instead of commercial SHF UWB) extends the communication range. Surface wave is a means of propagation where the wave is guided by the surface of the Earth. Surface wave is efficient at low frequencies, VLF to HF. The UWB HF channel was modeled and also experimentally characterized. The Federal Communications Commission (FCC) defines UWB as a signal with either a fractional bandwidth of 20% of the center frequency or a bandwidth of 500MHz. Designing an antenna to operate over the 20% bandwidth requirement of UWB is one of the greatest challenges. Two different antenna designs are presented, a spoke top antenna and a traveling wave antenna with photonic bandgap. These designs were implemented at the commercial UWB frequencies (3.1--10.6 GHz) due to availability of modeling tools for the higher frequencies, the reduced antenna size and the availability of measurement facilities. The spoke top was optimum for replication of the time domain input signal. The traveling wave antenna with photonic bandgap demonstrated increased impedance bandwidth of the antenna.

Lacomb, Julie Anne

33

Ultra-wideband radar motion sensor  

DOEpatents

A motion sensor is based on ultra-wideband (UWB) radar. UWB radar range is determined by a pulse-echo interval. For motion detection, the sensors operate by staring at a fixed range and then sensing any change in the averaged radar reflectivity at that range. A sampling gate is opened at a fixed delay after the emission of a transmit pulse. The resultant sampling gate output is averaged over repeated pulses. Changes in the averaged sampling gate output represent changes in the radar reflectivity at a particular range, and thus motion.

McEwan, Thomas E. (Livermore, CA)

1994-01-01

34

Ultra-wideband radar motion sensor  

DOEpatents

A motion sensor is based on ultra-wideband (UWB) radar. UWB radar range is determined by a pulse-echo interval. For motion detection, the sensors operate by staring at a fixed range and then sensing any change in the averaged radar reflectivity at that range. A sampling gate is opened at a fixed delay after the emission of a transmit pulse. The resultant sampling gate output is averaged over repeated pulses. Changes in the averaged sampling gate output represent changes in the radar reflectivity at a particular range, and thus motion. 15 figs.

McEwan, T.E.

1994-11-01

35

Optical Frequency Conversion for Millimeter-Wave Ultra-Wideband-Over-Fiber Systems  

Microsoft Academic Search

This letter investigates all-optical frequency conversion of ultra-wideband (UWB) signals for UWB-over-fiber up-link and down-link systems. An electrooptical Mach-Zehnder modulator is used in nonlinear regime to realize frequency up and down conversion of UWB rectangular pulse and monocycle. All-optical frequency up-conversion of rectangular pulse at 18 GHz generates undesired local oscillator centered in the up-converted UWB spectrum, whereas up-conversion of

Yannis Le Guennec; Ren Gary

2007-01-01

36

Impulse radio ultra-wideband DC power modeling  

Microsoft Academic Search

Several IEEE standards for modern Wireless Sensor Network (WSN) radios make use of impulse radio ultra-wideband (IR-UWB). To keep power consumption to a minimum, pulses are grouped together in bursts. This paper presents a model used to analyze the relationship between DC power consumption, burst length and link budget for both peak and average power limited systems. Such a model

Hans W. Pflug; Jac Romme; Kathleen Philips; Harmke de Groot

2011-01-01

37

Low data rate ultra wideband ECG monitoring system.  

PubMed

This paper presents a successfully implemented wireless electrocardiograph monitoring using low data rate ultra wideband (UWB) transmission. Low data rate ultra wideband is currently under consideration for the newly formed wireless body area network (WBAN) group (IEEE802.15.6) to develop a standard for wireless vital sign monitoring. Maximizing the transmission power of the transmitter and reducing the stringent requirements and complexity of the receiver have always been the key considerations for an UWB transceiver. Multiple pulses per bit has been sent in our low data rate UWB prototype system to increase the transmitter power, to reduce the complexity of the receiver and to ease the requirement on the receiver's analog to digital converter. Non-coherent technique has been used for the demodulation of UWB signals at the receiver that reduces the receiver complexity further. PMID:19163442

Keong, Ho Chee; Yuce, Mehmet R

2008-01-01

38

Ultra-wideband directional sampler  

DOEpatents

The Ultra-Wideband (UWB) Directional Sampler is a four port device that combines the function of a directional coupler with a high speed sampler. Two of the four ports operate at a high sub-nanosecond speed, in ``real time``, and the other two ports operate at a slow millisecond-speed, in ``equivalent time``. A signal flowing inbound to either of the high speed ports is sampled and coupled, in equivalent time, to the adjacent equivalent time port while being isolated from the opposite equivalent time port. A primary application is for a time domain reflectometry (TDR) situation where the reflected pulse returns while the outbound pulse is still being transmitted, such as when the reflecting discontinuity is very close to the TDR apparatus. 3 figs.

McEwan, T.E.

1996-05-14

39

Repeated exposure of C3H/HeJ mice to ultra-wideband electromagnetic pulses: lack of effects on mammary tumors.  

PubMed

It has been suggested that chronic, low-level exposure to radiofrequency (RF) radiation may promote the formation of tumors. Previous studies, however, showed that low-level, long-term exposure of mammary tumor-prone mice to 435 MHz or 2450 MHz RF radiation did not affect the incidence of mammary tumors. In this study, we investigated the effects of exposure to a unique type of electromagnetic energy: pulses composed of an ultra-wideband (UWB) of frequencies, including those in the RF range. One hundred C3H/HeJ mice were exposed to UWB pulses (rise time 176 ps, fall time 3.5 ns, pulse width 1.9 ns, peak E-field 40 kV/m, repetition rate 1 kHz). Each animal was exposed for 2 min once a week for 12 weeks. One hundred mice were used as sham controls. There were no significant differences between groups with respect to incidence of palpated mammary tumors, latency to tumor onset, rate of tumor growth, or animal survival. Histopathological evaluations revealed no significant differences between the two groups in numbers of neoplasms in all tissues studied (lymphoreticular tissue, thymus, respiratory, digestive and urinary tracts, reproductive, mammary and endocrine systems, and skin). Our major finding was the lack of effects of UWB-pulse exposure on promotion of mammary tumors in a well-established animal model of mammary cancer. PMID:11175673

Jauchem, J R; Ryan, K L; Frei, M R; Dusch, S J; Lehnert, H M; Kovatch, R M

2001-02-01

40

Antenna design for ultra wideband radio  

E-print Network

The recent allocation of the 3.1-10.6 GHz spectrum by the Federal Communications Commission (FCC) for Ultra Wideband (UWB) radio applications has presented a myriad of exciting opportunities and challenges for design in ...

Powell, Johnna, 1980-

2004-01-01

41

Investigation of the Performance of Microring Lasers as Tunable Transmitters for Application in Future WDM/Ultra Wideband (UWB)-over-Fiber Hybrid Networks  

NASA Astrophysics Data System (ADS)

The performance of tunable directly modulated 1.55-?m InGaAsP/InP microring lasers is investigated for the case of multiband orthogonal frequency division multiplexing (MB-OFDM) signal transmission, for application in ultra wideband (UWB)-over-fiber links. The assessment is based on numerical results derived from a multimode rate equation model. The properties of the microring laser are examined both qualitatively and quantitatively via typical constellation diagrams and error vector magnitude (EVM) calculations, respectively. The results depict a minimum EVM of less than 10% when the modulation ratio is in the order of 0.17 to 0.27.

Karabetsos, S.; Mikroulis, S.; Pikasis, E.; Nassiopoulos, A.; Bogris, A.; Syvridis, D.

2010-11-01

42

Ultra-wideband source research  

Microsoft Academic Search

Ultra-wideband (UWB) microwave sources and antennas are of interest for a variety of applications such as transient radar, mine detection and unexploded ordnance (UXO) location and identification. Much of the current research is being performed at the Air Force Research Laboratory (AFRL) at Kirtland AFB, NM, USA. The approach to high power source development has included high pressure gas switching,

William D. Prather; Carl E. Baum; Jane M. Lehr; J. P. O'Loughlin; S. Tyo; J. S. H. Schoenberg; R. J. Torres; T. C. Tran; D. W. Scholfield; J. W. Burger; J. Gaudet

1999-01-01

43

A fully integrated 19 pJ\\/pulse UWB transmitter for biomedical applications implemented in 65 nm CMOS technology  

Microsoft Academic Search

A fully integrated power-efficient CMOS pulsed ultra-wideband (I-UWB) transmitter for biomedical applications operating in the 3 - 5 GHz band is implemented in a 65 nm CMOS technology. The UWB transmitter adopts a low-complexity ring oscillator-based pulse generator architecture and pulse-position- modulation (PPM) for increased power efficiency and minimal silicon area. The transmitter consumes zero static bias power and achieves

Ondrej Novak; Cameron Charles; Richard B. Brown

2011-01-01

44

Analysis of RSSI based positioning with multiband OFDM UWB  

Microsoft Academic Search

Ultra-wideband (UWB) enables accurate Localization and Tracking (LT) applications. However, the required and sophisticated time of arrival (ToA) ranging procedure relies on accurate synchronization and time measurements. Today, only few UWB devices support the required ranging feature. Examples are pulse based low data rate (LDR) UWB devices. Conventional multiband OFDM based high data rate (HDR) UWB devices do not support

Andreas WAADT; Admir BURNIC; Dong Xu; Christian KOCKS; Shangbo Wang; P. Jung

2010-01-01

45

Positioning in multiband OFDM UWB utilizing received signal strength  

Microsoft Academic Search

Ultra-wideband (UWB) enables accurate Localization and Tracking (LT) applications. However, the required and sophisticated time of arrival (ToA) ranging procedure relies on accurate synchronization and time measurements. Today, only few UWB devices support the required ranging feature. Examples are pulse based low data rate (LDR) UWB devices. Conventional multiband OFDM based high data rate (HDR) UWB devices do not support

A. E. Waadt; S. Wang; C. Kocks; A. Burnic; D. Xu; G. H. Bruck; P. Jung

2010-01-01

46

Multi-pulse frequency shifted (MPFS) multiple access modulation for ultra wideband  

DOEpatents

The multi-pulse frequency shifted technique uses mutually orthogonal short duration pulses o transmit and receive information in a UWB multiuser communication system. The multiuser system uses the same pulse shape with different frequencies for the reference and data for each user. Different users have a different pulse shape (mutually orthogonal to each other) and different transmit and reference frequencies. At the receiver, the reference pulse is frequency shifted to match the data pulse and a correlation scheme followed by a hard decision block detects the data.

Nekoogar, Faranak (San Ramon, CA); Dowla, Farid U. (Castro Valley, CA)

2012-01-24

47

Self Organization of Wireless Sensor Networks Using Ultra-Wideband Radios  

SciTech Connect

Ultra-wideband (UWB) technology has proven to be useful in short range, high data rate, robust, and low power communications. These features can make UWB systems ideal candidates for reliable data communications between nodes of a wireless sensor network (WSN). However, the low powered UWB pulses can be significantly degraded by channel noise, inter-node interference, and intentional jamming. In this paper we present a novel interference suppression technique for UWB based WSNs that promises self-organization in terms of power conservation, scalability, and channel estimation for the entire distributed network.

Nekoogar, F; Dowla, F; Spiridon, A

2004-07-19

48

An Investigation of Bluetooth Mergence with Ultra Wideband  

Microsoft Academic Search

This paper presents an investigation into some merging options between an upper-layer Bluetooth (BT) protocol stack with a lower-layer ECMA-368\\/9 ultra wideband (UWB) radio connection. A Bluetooth over ultra wideband (BToUWB) system is modeled by channeling an existing compliant Bluetooth connection's data over a software implemented UWB medium access control (MAC) and simulated physical (PHY) layer radio channel. The aim

Etienne Van Der Linde; Gerhard P. Hancke

2008-01-01

49

Ray-tracing based modeling of ultra-wideband pulse propagation in railway tunnels  

Microsoft Academic Search

Ray tracing based on geometric optics can be utilized for generating propagation models for arbitrary and com- plex environments. These methods can be employed to determine important wireless channel characteristics such as coherence and delay spread. In this paper, an image theory based ray tracing method is used to study ultra-wideband propagation in complex tunnel environments such as curved tunnels

Neeraj Sood; Liang Liang; Sean V. Hum; Costas D. Sarris

2011-01-01

50

Solid-State Nanopulse Generator: Application in Ultra-wideband Bioeffects Research  

Microsoft Academic Search

This paper describes the design and characterization of an ultra-wideband (UWB) pulse (搉anopulse) generator suitable for biomedical research. The pulser generates nanosecond-long pulses of adjustable rise time, amplitude, and duration, permitting analysis of possible bioeffects over a range of pulse characteristics. Nanopulses of 3.4 kV and 2.4 ns rise time are achieved in a 4-stage pulser circuit using ZTX415 transistors.

Ramana K. Sunkam; Rastko R. Selmic; Donald T. Haynie; Jeremiah S. Hill

2004-01-01

51

Antenna and pulse designs for meeting UWB spectrum density requirements  

Microsoft Academic Search

Antenna design in ultra-wideband (UWB) systems is a major challenge. For, in contrast to conventional systems, wherein waveform distortion by the antenna is negligible, there is potentially significant waveform distortion by UWB antennas. A further challenge to UWB system design is posed by mandated limits on power spectrum density, such as the FCC emission mask. In this paper, we join

Guofeng Lu; Predrag Spasojevic; Larry Greenstein

2003-01-01

52

Micro-Doppler processing for ultra-wideband radar data  

NASA Astrophysics Data System (ADS)

In this paper, we describe an operational pulse Doppler radar imaging system for indoor target localization and classification, and show how a target's micro-Doppler signature (?DS) can be processed when ultra-wideband (UWB) waveforms are employed. Unlike narrowband radars where time-frequency signal representations can be applied to reveal the target time-Doppler frequency signatures, the UWB system permits joint range-time-frequency representation (JRTFR). JRTFR outputs the data in a 3D domain representing range, frequency, and time, allowing both the ?DS and high range resolution (HRR) signatures to be observed. We delineate the relationship between the ?DS and the HRR signature, showing how they would form a complimentary joint feature for classification. We use real-data to demonstrate the effectiveness of the UWB pulse-Doppler radar, combined with nonstationary signal analyses, in gaining valuable insights into human positioning and motions.

Smith, Graeme E.; Ahmad, Fauzia; Amin, Moeness G.

2012-06-01

53

IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 45, NO. 1, JANUARY 2010 153 A Pulsed UWB Receiver SoC  

E-print Network

-1.4 nJ/bit and achieves a sensitivity of 76 dBm at a data rate of 16 Mb/s (10 BER). A multi-stage-power electronics, neural interface, pulse-position modulation, receivers, RF, ultra- wideband (UWB). I direction. Compared to existing micro- and nano-air vehicles used by the military and other government

Voldman, Joel

54

Ultra-wideband source and antenna research  

Microsoft Academic Search

Ultra-wideband (UWB) microwave sources and antennas are of interest for a variety of applications, such as transient radar, mine detection, and unexploded ordnance (UXO) location and identification. Much of the current research is being performed at the Air Force Research Laboratory (AFRL) at Kirtland AFB, NM. The approach to high power source development has included high pressure gas switching, oil

William D. Prather; Carl E. Baum; Jane M. Lehr; J. P. O'Loughlin; S. Tyo; J. S. H. Schoenberg; R. J. Torres; T. C. Tran; D. W. Scholfield; J. Gaudet; J. W. Burger

2000-01-01

55

Ultra-Wideband Angle-of-Arrival Tracking Systems  

NASA Technical Reports Server (NTRS)

Systems that measure the angles of arrival of ultra-wideband (UWB) radio signals and perform triangulation by use of those angles in order to locate the sources of those signals are undergoing development. These systems were originally intended for use in tracking UWB-transmitter-equipped astronauts and mobile robots on the surfaces of remote planets during early stages of exploration, before satellite-based navigation systems become operational. On Earth, these systems could be adapted to such uses as tracking UWB-transmitter-equipped firefighters inside buildings or in outdoor wildfire areas obscured by smoke. The same characteristics that have made UWB radio advantageous for fine resolution ranging, covert communication, and ground-penetrating radar applications in military and law-enforcement settings also contribute to its attractiveness for the present tracking applications. In particular, the waveform shape and the short duration of UWB pulses make it possible to attain the high temporal resolution (of the order of picoseconds) needed to measure angles of arrival with sufficient precision, and the low power spectral density of UWB pulses enables UWB radio communication systems to operate in proximity to other radio communication systems with little or no perceptible mutual interference.

Arndt, G. Dickey; Ngo, Phong H.; Phan, Chau T.; Gross, Julia; Ni, Jianjun; Dusl, John

2010-01-01

56

Remote Monitoring and Tracking of UF6 Cylinders Using Long-Range Passive Ultra-wideband (UWB) RFID Tags  

SciTech Connect

An IAEA Technical Meeting on Techniques for IAEA Verification of Enrichment Activities identified 'smart tags' as a technology that should be assessed for tracking and locating UF6 cylinders. Although there is vast commercial industry working on RFID systems, the vulnerabilities of commercial products are only beginning to emerge. Most of the commercially off-the-shelf (COTS) RFID systems operate in very narrow frequency bands, making them vulnerable to detection, jamming and tampering and also presenting difficulties when used around metals (i.e. UF6 cylinders). Commercial passive RFID tags have short range, while active RFID tags that provide long ranges have limited lifetimes. There are also some concerns with the introduction of strong (narrowband) radio frequency signals around radioactive and nuclear materials. Considering the shortcomings of commercial RFID systems, in their current form, they do not offer a promising solution for continuous monitoring and tracking of UF6 cylinders. In this paper, we identify the key challenges faced by commercial RFID systems for monitoring UF6 cylinders, and introduce an ultra-wideband approach for tag/reader communications that addresses most of the identified challenges for IAEA safeguards applications.

Nekoogar, F; Dowla, F

2007-06-06

57

Optimal Waveforms Design for Ultra-Wideband Impulse Radio Sensors  

PubMed Central

Ultra-wideband impulse radio (UWB-IR) sensors should comply entirely with the regulatory spectral limits for elegant coexistence. Under this premise, it is desirable for UWB pulses to improve frequency utilization to guarantee the transmission reliability. Meanwhile, orthogonal waveform division multiple-access (WDMA) is significant to mitigate mutual interferences in UWB sensor networks. Motivated by the considerations, we suggest in this paper a low complexity pulse forming technique, and its efficient implementation on DSP is investigated. The UWB pulse is derived preliminarily with the objective of minimizing the mean square error (MSE) between designed power spectrum density (PSD) and the emission mask. Subsequently, this pulse is iteratively modified until its PSD completely conforms to spectral constraints. The orthogonal restriction is then analyzed and different algorithms have been presented. Simulation demonstrates that our technique can produce UWB waveforms with frequency utilization far surpassing the other existing signals under arbitrary spectral mask conditions. Compared to other orthogonality design schemes, the designed pulses can maintain mutual orthogonality without any penalty on frequency utilization, and hence, are much superior in a WDMA network, especially with synchronization deviations. PMID:22163511

Li, Bin; Zhou, Zheng; Zou, Weixia; Li, Dejian; Zhao, Chong

2010-01-01

58

UWB transmitter  

DOEpatents

An ultra-wideband (UWB) dual impulse transmitter is made up of a trigger edge selection circuit actuated by a single trigger input pulse; a first step recovery diode (SRD) based pulser connected to the trigger edge selection circuit to generate a first impulse output; and a second step recovery diode (SRD) based pulser connected to the trigger edge selection circuit in parallel to the first pulser to generate a second impulse output having a selected delay from the first impulse output.

Dallum, Gregory E.; Pratt, Garth C.; Haugen, Peter C.; Romero, Carlos E.

2013-01-15

59

Ultra Wideband Indoor Radio Channel Models: Preliminary Results  

Microsoft Academic Search

ULTRA WIDEBAND RADIO CHAN-NEL MEASUREMENT TECHNIQUES Knowledge of the signal propagation mechanisms in the chan-nel is vital for the radio system design and the system perform-ance analysis. However, currently published wideband or nar-rowband radio channel models do not offer spatial resolution high enough for the ultra wideband (UWB) applications and the real channel measurements are needed. In this paper is

Veikko Hovinen

2002-01-01

60

Simulation of indoor ultra wideband propagation channel modeling  

Microsoft Academic Search

UWB (ultra wideband) propagation channel modeling is very important for UWB communication system designing and its performance optimization. The split-field PML (perfectly matched layer) and unsplit-field PML were combined respectively with PSTD (pseudospectral time-domain) method to model 2-D (two dimensional) and 3-D indoor UWB propagation. The attenuation factor algorithm was applied to simulate realistic UWB propagation under 2-D environment. Channel

Huaibei Zhou; Chunhua Yang; Fan Wang

2005-01-01

61

Modeling of ultra wideband transmission through building walls  

Microsoft Academic Search

The prediction of transmission phenomenon through the building walls is one of the fundamental parts of the ultra wideband (UWB) channel modeling in the indoor propagation environments. Considering the broad variety of the wall materials and the equivalent electric parameters, the need to an accurate method for modeling UWB signal transmission is increased. The objective of this work is to

Narges Noori; Ali Abolghasemi; Masoum Fardis

2008-01-01

62

Ultra wideband indoor radio channel models: preliminary results  

Microsoft Academic Search

Knowledge of the signal propagation mechanisms in the channel is vital for the radio system design and the system performance analysis. However, currently published wideband or narrowband radio channel models do not offer spatial resolution high enough for the ultra wideband (UWB) applications and real channel measurements are needed. The preliminary UWB radio channel model for a selected radio link-configuration

V. Hovinen; Matti Hamalainen; Tinzo Patsi

2002-01-01

63

An Empirical Ultra Wideband Channel Model for Indoor Laboratory Environments  

Microsoft Academic Search

Channel measurement and modeling is an im- portant issue when designing ultra wideband (UWB) com- munication systems. In this paper, the results of some UWB time-domain propagation measurements performed in modern laboratory (Lab) environments are presented. The Labs are equipped with many electronic and measurement devices which make them different from other indoor loca- tions like office and residential environments.

Narges NOORI; Roghieh KARIMZADEH-BAEE; Ali ABOLGHASEMI

64

Compact ultra-wideband metamaterial antenna  

Microsoft Academic Search

A negative index metamaterial antenna is presented in this paper for ultra-wideband (UWB) applications; which operates in C and X-bands. The proposed antenna is composed of three-unit cells of left-handed metamaterial (LHM) where these LHM unit cells are composed of a combination of modified octagonal spiral resonator (OSR), octagonal split-ring resonator (OSRR), capacitance-loaded strip (CLS), and wire that exhibit negative

A. R. H. Alhawari; A. Ismail; M. A. Mahdi

2010-01-01

65

A novel approach for Ultra-wideband MIMO channel modeling  

Microsoft Academic Search

Channel models used for analysis of narrowband systems are inadequate for Ultra-wideband (UWB) systems. In addition, the combination of UWB signals with multiple-input multiple-output (MIMO) technology increase the necessity of developing new channel models appropriate for wideband transmissions. In this paper we determine a new channel transfer function (CTF) for UWB channels and using this expression we calculate the space-time-frequency

Ana-Maria Pistea; Tudor Palade; Anca Moldovan

2010-01-01

66

Cyclic Prefix Signaling for Pulse Shape Modulation UWB RAKE Receivers  

NASA Astrophysics Data System (ADS)

Combining transmission of ultra wideband pulses, organized in blocks, with the inclusion of cyclic prefixing pulses yields a pulsewidth periodic signal at the receiver. Although unknown, this signal fits perfectly the diversity exploitive architecture of a RAKE receiver. Aiming to profit from this signal arrangement, we propose a pulse shape modulation system employing a RAKE receiver that estimates this periodic signal during a training interval and uses the estimated values for detection of data symbols. Our proposal relies on the invariability of the multipath propagation channel during the transmission of a UWB packet, the adequate application of the cyclic prefix, and the fact that different transmitted pulses result in different periodic signals at the receiver. This system is equivalent to transforming the multipath nature of the UWB propagation channel into a multichannel digital communications affected solely by additive noise. Our proposal is important because it ameliorates the performance of a pulse shape modulation RAKE receiver. On the other hand, the cost of our proposed system resides in the inefficiencies product of the cyclic prefix inclusion.

Cartagena Gordillo, Alex; Kohno, Ryuji

67

UWB communication using SAW correlators  

Microsoft Academic Search

A simple approach to ultra-wideband (UWB) communication has been demonstrated using surface acoustic wave (SAW) correlators to provide direct RF-to-baseband conversion. The SAW correlators used are bi-phase shift key (BPSK) coded devices that can directly generate or detect an RF signal. This continuous wave (CW) approach to UWB communication is markedly different from the prevailing pulse-based techniques and offers advantages

Robert Brocato; Edwin Heller; J. Wendt; J. Blaich; G. Wouters; E. Gurule; G. Omdahl; D. Palmer

2004-01-01

68

Robust range-based localization and motion planning under uncertainty using ultra-wideband radio  

E-print Network

The work presented in this thesis addresses two problems: accurately localizing a mobile robot using ultra-wideband (UWB) radio signals in GPS-denied environments; and planning robot trajectories that incorporate belief ...

Prentice, Samuel J. (Samuel James)

2007-01-01

69

All-optical UWB doublet pulses generation by using a delay interferometer  

NASA Astrophysics Data System (ADS)

We demonstrated a simple scheme to generate ultra wideband (UWB) doublet pulses by inputting a dark return-to-zero (RZ) signal into a fiber delay interferometer (FDI). An 0.625-Gbit/s dark-RZ pulse train where the pulse width is 120 ps was inputted into a FDI where the free spectral range (FSR) is 0.16 nm (20 GHz, according time delay is 50 ps) and the extinction ratio (ER) is 9 dB, and the phase difference of the two fiber arms was changed and controlled by adjusting the operation temperature of the FDI, by do so, UWB doublet pulses were directly generated at an output port of the FDI. The system parameter effects on the output UWB pulses were discussed. Moreover, we also numerically demonstrated that the UWB quadruplet pulses can be generated in the same set by optimizing system parameters. This scheme has some distinct advantages including easy integration, convenient tuning, good stability, and so on. Presented method also accords with the general features in future applied UWB-Over-Fiber communication system, such as, single optical source input, simple configuration and passive device.

Wang, Fei; Xu, En-Ming

2013-06-01

70

A Maximum Entropy Approach to Ultra-Wideband Channel Modeling  

Microsoft Academic Search

In this paper, a unified framework for ultra-wideband channel (UWB channel) modeling based on the maximum entropy approach is provided. For a given set of constraints, a consistent model which takes into account the information at hand is obtained. Two cases are considered: channel power knowledge and knowledge of the covariance matrix. The channel power delay spectrum is also derived

R. L. de Lacerda Neto; A. Menouni; M. Debbah; B. H. Fleury

2006-01-01

71

On ultra wideband channel modeling for in-body communications  

Microsoft Academic Search

Innovative medical applications such as implant wireless sensors for health monitoring, automatic drug deliverance, etc. can be realized with the use of ultra wideband (UWB) radio technology. Nevertheless, for efficient design of wireless systems operating inside the human body a radio communication channel model is essential. Although a lot of research effort has recently been devoted to the characterization of

A. Khaleghi; R. Chavez-Santiago; X. Liang; I. Balasingham; V. C. M. Leung; T. A. Ramstad

2010-01-01

72

Ultra Wideband Indoor Radio Channel Models: Preliminary Results  

Microsoft Academic Search

Knowledge of the signal propagation mechanisms in the chan- nel is vital for the radio system design and the system perform- ance analysis. However, currently published wideband or nar- rowband radio channel models do not offer spatial resolution high enough for the ultra wideband (UWB) applications and the real channel measurements are needed. In this paper is given the preliminary

Veikko Hovinen; Matti H鋗鋖鋓nen; Timo P鋞si

73

Novel approach to ultra-wideband antenna design  

Microsoft Academic Search

A novel approach to ultra-wideband (UWB) antenna design is presented which is based on a general description for the geometry of monopole antennas. This general description is capable of producing almost all possible shapes for monopole antennas and it is compatible with different optimization methods. The general description is used for the optimization of rotationally-symmetric monopole antenna with finite ground

K. Paran; M. Fardis; A. Abolghasemi

2008-01-01

74

Ultra-wideband communication system prototype using orthogonal frequency coded SAW correlators.  

PubMed

This paper presents preliminary ultra-wideband (UWB) communication system results utilizing orthogonal frequency coded SAW correlators. Orthogonal frequency coding (OFC) and pseudo-noise (PN) coding provides a means for spread-spectrum UWB. The use of OFC spectrally spreads a PN sequence beyond that of CDMA; allowing for improved correlation gain. The transceiver approach is still very similar to that of the CDMA approach, but provides greater code diversity. Use of SAW correlators eliminates many of the costly components that are typically needed in the intermediate frequency (IF) section in the transmitter and receiver, and greatly reduces the signal processing requirements. Development and results of an experimental prototype system with center frequency of 250 MHz are presented. The prototype system is configured using modular RF components and benchtop pulse generator and frequency source. The SAW correlation filters used in the test setup were designed using 7 chip frequencies within the transducer. The fractional bandwidth of approximately 29% was implemented to exceed the defined UWB specification. Discussion of the filter design and results are presented and are compared with packaged device measurements. A prototype UWB system using OFC SAW correlators is demonstrated in wired and wireless configurations. OFC-coded SAW filters are used for generation of a transmitted spread-spectrum UWB and matched filter correlated reception. Autocorrelation and cross-correlation system outputs are compared. The results demonstrate the feasibility of UWB SAW correlators for use in UWB communication transceivers. PMID:23475929

Gallagher, Daniel R; Kozlovski, Nikolai Y; Malocha, Donald C

2013-03-01

75

Ultra Wideband Electromagnetic Phantoms for Antennas and Propagation Studies  

NASA Astrophysics Data System (ADS)

Ultra wideband (UWB) technologies are expected to be used in ultra-high-speed wireless personal area networks (WPAN) and wireless body area networks (WBAN). UWB human electromagnetic phantoms are useful for performance evaluation of antennas mounted in the vicinity of a human body and channel assessment when a human body blocks a propagation path. Publications on UWB phantoms, however, have been limited so far. This paper describes the development of liquid UWB phantom material (aqueous solution of sucrose) and UWB arm and torso phantoms. The UWB phantoms are not intended to evaluate a specific absorption rate (SAR) in a human body, because UWB devices are supposed to transmit at very low power and thus should pose no human hazard.

Yamamoto, Hironobu; Zhou, Jian; Kobayashi, Takehiko

76

A systems and network analysis approach to antenna design for UWB communications  

Microsoft Academic Search

Ultra-wideband (UWB) communications is an unconventional radio method whereby information is transmitted using very short pulses having very low duty cycles using time-position based modulation schemes. Recently, the FCC has permitted the commercial deployment of UWB devices under rules incorporated into Part 15 of its regulations (Federal Communications Commission, FCC 02-48, 2002). These rules essentially allow UWB communications devices to

Swn Zwierzchowski; Pouyan Jazayeri

2003-01-01

77

Bandwidth extension for ultra-wideband CMOS low-noise amplifiers  

Microsoft Academic Search

Techniques are proposed to enhance the bandwidth of ultra-wideband (UWB) CMOS low-noise amplifiers (LNA). By using multiple-input-branch technique and resistive shunt- feedback technique, LNA could achieve ultra-wideband input impedance matching with small noise figure degradation. The gain bandwidth is enhanced by an L type inter-stage matching network between the input transistors and the cascode transistor which could enhance both the

Baoyong Chi; Chun Zhang; Zhihua Wang

2008-01-01

78

A Novel Small-Size Printed Tapered Monopole Antenna for UWB WBAN  

Microsoft Academic Search

In this letter, a novel antenna topology based on the printed tapered monopole antenna (PTMA) is investigated in view of ultra-wideband (UWB) wireless body area network (WBAN) applications. First, the bandwidth in the presence of a human arm is studied. Second, the pulse distortion of a modulated Gaussian pulse is investigated, based on measured S21-parameters. We observe that there is

Joeri R. Verbiest; Guy A. E. Vandenbosch

2006-01-01

79

Ultra-wideband channel model for communication around the human body  

Microsoft Academic Search

Using ultra-wideband (UWB) wireless sensors placed on a person to continuously monitor health information is a promising new application. However, there are currently no detailed models describing the UWB radio channel around the human body making it difficult to design a suitable communication system. To address this problem, we have measured radio propagation around the body in a typical indoor

Andrew Fort; Julien Ryckaert; Claude Desset; Philippe De Doncker; Piet Wambacq; Leo Van Biesen

2006-01-01

80

Ultra-wideband outdoor channel modeling using ray tracing techniques  

Microsoft Academic Search

An ultra-wideband (UWB) channel modeling approach using ray tracing techniques is presented. The scenario consists of a farm area with clusters of scatterers over moderately varying terrain. The channel sounding consists of power-scaled distinct frequencies whereby all relevant ray signal descriptors are captured. From this we develop a two-ray and three-ray path loss model with associated parameters. The technique is

Shahriar Emami; Celestino A. Corral; Gregg Rasor

2005-01-01

81

Simulating ultra-wideband imaging for the early detection of tissue injury  

NASA Astrophysics Data System (ADS)

Various medical imaging techniques exist to detect the early development of tissue damage. However, a widely commercialized device that can be easily used and is cost effective is still needed. Through a literature review, we examined ultrasound, microwave tomography, and ultra-wideband (UWB) technology. Out of these techniques, UWB is the most promising since it has the capability to detect small adjustments in dielectric properties, which can change with minor alterations in perfusion and internal pressure. These minor alterations are vital in detecting the onset of ischemia, which precedes many serious conditions affecting tissue health. In addition to its ability in detection, UWB also has the potential to become a widely accessible technology to hospitals. Using software called XFdtd, we simulated ultrawideband pulses propagating through planes designed to resemble tissue in its dielectric properties. After testing several sizes of the horn antenna and configurations for the wire and port, the antenna's near field was finally able to reach the distance necessary to penetrate the tissue model. The resulting graph of voltage versus time was generated from the received antenna signal and it will be compared to the graphs that result after the dielectric properties of the model have been changed to simulate tissue injury. Through this manipulation of the tissue model, the sensitivity and selectivity of UWB in measuring small fluctuations in perfusion can be determined. In this future work with XFdtd, we want to show that UWB is a novel and viable technique in detecting early tissue injury.

Niu, Weihong; Hlavaty, Kelan; Tanska, Daria; Tseng, Nancy; Li, Jia; Penprase, Barbara

2009-02-01

82

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 54, NO. 5, MAY 2006 2169 A Computational Study of Ultra-Wideband Versus  

E-print Network

Study of Ultra-Wideband Versus Narrowband Microwave Hyperthermia for Breast Cancer Treatment Mark (NB) microwave hyperthermia for breast cancer treatment with a recently proposed ultra-wideband (UWB) and thermal simulations with realistic numerical breast phantoms derived from magnetic resonance images (MRIs

Hagness, Susan C.

83

Polarization diverse ultra-wideband antenna technology  

NASA Astrophysics Data System (ADS)

This paper presents an ultra-wideband (UWB) antenna design that is capable of multiple polarizations. The multiple element design provides polarization diversity while maintaining desirable phase and standing wave characteristics. The prospect of replacing multiple single purpose antennas on a modern military platform with a single antenna capable of wideband and multi-function operation is of significant interest. Considering space availability, maintenance simplification and aerodynamics, antenna count is now carefully considered in the planning of each new aircraft and space vehicle and in many modification of existing equipment. The broadband radiation capability of this antenna together with its polarization and phase characteristics suggest the possibility of its service in such applications. This antenna can also be of use in other environments such as satellite communications for both the orbital vehicle and the earthbound receptor functions. In the latter, the earthbound satellite receptor use of this antenna can be supplemented with a parabolic dish or other reflector arrangement.

Wicks, Michael C.; Antonik, Paul

1993-01-01

84

FDTD simulation tools for UWB antenna analysis.  

SciTech Connect

This paper describes the development of a set of software tools useful for analyzing ultra-wideband (UWB) antennas and structures. These tools are used to perform finite difference time domain (FDTD) simulation of a conical antenna with continuous wave (CW) and UWB pulsed excitations. The antenna is analyzed using spherical coordinate-based FDTD equations that are derived from first principles. The simulation results for CW excitation are compared to simulation and measured results from published sources; the results for UWB excitation are new.

Brocato, Robert Wesley

2005-02-01

85

FDTD simulation tools for UWB antenna analysis.  

SciTech Connect

This paper describes the development of a set of software tools useful for analyzing ultra-wideband (UWB) antennas and structures. These tools are used to perform finite difference time domain (FDTD) simulation of a conical antenna with continuous wave (CW) and UWB pulsed excitations. The antenna is analyzed using spherical coordinate-based FDTD equations that are derived from first principles. The simulation results for CW excitation are compared to simulation and measured results from published sources; the results for UWB excitation are new.

Brocato, Robert Wesley

2004-12-01

86

A concept for hip prosthesis identification using ultra wideband radar.  

PubMed

Ultra wideband (UWB) radar has been extensively investigated both theoretically and practically for the identification buried artifacts. Ground probe radar (GPR) concentrates on the identification of lightly buried land mines, unexploded ordnance (UXO) and archeological targets. The same technology is proposed in a similar context for the rapid identification of in vivo implanted metallic prostheses. The technique is based on resonance based target identification and the paper investigates UWB scattering from a metallic hip prosthesis in free space as a first step in the identification process. PMID:17271965

Lui, Hoi-Shun; Shuley, Nicholas; Crozier, Stuart

2004-01-01

87

UWB dual burst transmit driver  

DOEpatents

A dual burst transmitter for ultra-wideband (UWB) communication systems generates a pair of precisely spaced RF bursts from a single trigger event. An input trigger pulse produces two oscillator trigger pulses, an initial pulse and a delayed pulse, in a dual trigger generator. The two oscillator trigger pulses drive a gated RF burst (power output) oscillator. A bias driver circuit gates the RF output oscillator on and off and sets the RF burst packet width. The bias driver also level shifts the drive signal to the level that is required for the RF output device.

Dallum, Gregory E. (Livermore, CA); Pratt, Garth C. (Discovery Bay, CA); Haugen, Peter C. (Livermore, CA); Zumstein, James M. (Livermore, CA); Vigars, Mark L. (Livermore, CA); Romero, Carlos E. (Livermore, CA)

2012-04-17

88

Joint estimation of time of arrival and power profile for UWB localization  

Microsoft Academic Search

In time of arrival (TOA) estimation of received ultra-wideband (UWB) pulses, traditional maximum likelihood (ML) and generalized likelihood estimators become impractical due to their high sampling rate. Sub-nyquist ML-based TOA estimation currently assumes a priori knowledge of the UWB channels in the form of the average power delay profile (APDP). In this paper, instead of assuming a known APDP, we

Fang Shang; Benoit Champagne; Ioannis Psaromiligkos

2010-01-01

89

Ultra-wideband digital baseband  

E-print Network

The FCC approved the use of Ultra-wideband signals for communication purposes in February 2002 in the band from 3.1GHz to 10.6GHz, effectively opening 7.5GHz of free unlicensed bandwidth. There are two main constraints for ...

Bl醶quez-Fern醤dez, Ra鷏, 1975-

2006-01-01

90

A compact LTCC ultra-wideband bandpass filter using semi-lumped parallel-resonance circuits for spurious suppression  

Microsoft Academic Search

A very compact ultra-wideband (UWB) bandpass filter with both high selectivity and suppressed spurious passband is implemented in the low-temperature co-fired ceramic (LTCC) substrate. By using the optimum distributed highpass filter structure of 11th-order, an ultra-wideband filter with the bandwidth from 3.1 GHz to 10.6 GHz is realized. In this study, the semi-lumped parallel resonance circuits are adopted in conjunction

Chung-Hwa Wu; Yo-Shen Lin; Chi-Hsueh Wang; Chun Hsiung Chen

2007-01-01

91

UWB pulse propagation into human tissues  

NASA Astrophysics Data System (ADS)

In this paper the propagation of a UWB pulse into a layered model of the human body is studied to characterize absorption and reflection of the UWB signal due to the different body tissues. Several time behaviours for the incident UWB pulse are considered and compared with reference to the feasibility of breath and heartbeat activity monitoring. Results show that if the UWB source is placed far from the human body, the reflection coming from the interface between air and skin can be used to detect the respiratory activity. On the contrary, if the UWB source is placed close to the human body, a small reflection due to the interface between the posterior lung wall and the bone, which is well distanced in time from the reflections due to the first layers of the body model, can be used to detect lung and heart changes associated with the cardio-respiratory activity.

Cavagnaro, Marta; Pittella, Erika; Pisa, Stefano

2013-12-01

92

INTRODUCTION TO ULTRA-WIDEBAND ANTENNAS Hans Gregory Schantz (h.schantz@ieee.org)  

E-print Network

INTRODUCTION TO ULTRA-WIDEBAND ANTENNAS Hans Gregory Schantz (h.schantz@ieee.org) Next-RF, Inc. 4811Cove Creek Drive Brownsboro, AL 35741 In addition, a UWB antenna is preferentially non- dispersive- periodic antenna is an example of a dispersive antenna. Larger scale components radiate low frequency

Arslan, H眉seyin

93

Ultra-wideband channel modeling on the basis of information-theoretic criteria  

Microsoft Academic Search

We present results of two ultra-wideband (UWB) channel measurement campaigns in the 2-5 GHz frequency band, and use Akaike's Information Criterion (AIC) to determine suitable distributions for the channel impulse response taps. Despite the large bandwidth, AIC supports the complex Gaussian tap distribution, with mean depending on the measurement setting. We estimate the empirical covariance matrix of the channel impulse

Ulrich G. Schuster; H. Bolcskei; G. Durisi

2005-01-01

94

An Emission Strategy of Cognitive Radio-Ultra Wideband Based on Interference Temperature Model  

Microsoft Academic Search

The cognitive radio combining ultra wideband (CRUWB) system will be considered as one of the candidates of the next generation short range wireless communication technology. For no any idle frequency band in the current radio environment, the emission power of CR-UWB must regulate to assure that the licensed users work normally. In this paper, based on the interference temperature model,

Shubin Wang; Zheng Zhou; Kyungsup Kwak

2009-01-01

95

Ultra wideband system outage studies in a square cell with partial Rake receiver and lognormal fading  

Microsoft Academic Search

Ultra wideband (UWB) spread spectrum system performance is analysed in a square-shaped cell with centralised and distributed topologies. Cochannel interference induced outage probability is used as a performance measure. The probability of outage varies depending on the spatial distribution of users (link distances), propagation parameters, user activities, and receiver timing errors. Power sums of multiple lognormal signal components are approximated

Pekka Pirinen

2005-01-01

96

Ultra Wideband Bandpass Filter Using Embedded Stepped Impedance Resonators on Multilayer Liquid Crystal Polymer Substrate  

Microsoft Academic Search

This letter proposes an ultra wideband (UWB) bandpass filter (BPF) based on embedded stepped impedance resonators (SIRs). In this study, broad side coupled patches and high impedance microstrip lines are adopted as quasi-lumped elements for realizing the coupling between adjacent SIRs, which are used to suppress stopband harmonic response. An eight-pole UWB BPF is developed from lump-element bandpass prototype and

Zhang-Cheng Hao; Jia-Sheng Hong

2008-01-01

97

Ultra-Wideband Bandpass Filter Using Multilayer Liquid-Crystal-Polymer Technology  

Microsoft Academic Search

Novel ultra-wideband (UWB) bandpass filters are proposed based on quasi-lumped-element prototypes and implemented with multilayer liquid-crystal-polymer (LCP) technology. In this study, the broadside-coupled microstrip radial stubs and high-impedance microstrip lines are adopted as quasi-lumped elements for realizing compact UWB bandpass filters. By introducing a short-circuited high-impedance microstrip line as a shunt inductor and suitably designing quasi-lumped-element capacitors, a compact six-pole

Zhang-Cheng Hao; Jia-Sheng Hong

2008-01-01

98

Compact Wide Stopband Ultra Wideband Bandpass Filter Using Multilayer Liquid Crystal Polymer Technology  

Microsoft Academic Search

Novel ultra-wideband (UWB) bandpass filters (BPFs) are proposed based on broadside coupled capacitive-loaded transmission line resonators (C-L TLR) in this letter. By utilizing the wideband harmonic suppression behavior of C-L TLR, the proposed UWB BPFs were designed with wide stopband and implemented using multilayer organic liquid crystal polymer (LCP) technology. As demonstrations, a vialess five-pole BPF was designed first, and

Zhang-Cheng Hao; Jia-Sheng Hong

2009-01-01

99

A Vehicular Ultra-Wideband Channel Model for Future Wireless IntraVehicle Communications (IVC) Systems  

Microsoft Academic Search

Future wireless intra-vehicle communications (IVC) systems adopting ultra-wideband (UWB) radio are proposed in this paper, which provide onboard passengers with high-speed duplex data exchange services. In this paper, a vehicular UWB channel model is first developed by modifying the IEEE 802.15.3a indoor model to fit into the vehicular environments with dense and concentrated clusters and rays. The main channel statistical

Weidong Xiang

2007-01-01

100

Cooperative Communications in Ultra-Wideband Wireless Body Area Networks: Channel Modeling and System Diversity Analysis  

Microsoft Academic Search

In this paper, we explore the application of cooperative communications in ultra-wideband (UWB) wireless body area networks (BANs), where a group of on-body devices may collaborate together to communicate with other groups of on-body equipment. Firstly, time-domain UWB channel measurements are presented to characterize the body-centric multipath channel and to facilitate the diversity analysis in a cooperative BAN (CoBAN). We

Yifan Chen; Jianqi Teo; Joshua C. Y. Lai; Erry Gunawan; Kay Soon Low; Cheong Boon Soh; Predrag B. Rapajic

2009-01-01

101

Ultra wideband signal impact on IEEE802.1 lb and Bluetooth performances  

Microsoft Academic Search

This paper presents the results of a co-existence study investigating the impact of ultra wideband (UWB) interference on IEEE802.11b and Bluetooth networks. Results are based on the experimental test measurements made at the University of Oulu, Finland using simple high power UWB transmitter prototypes as interference sources. Preliminary results showed that, under the extreme conditions of this experiment, both IEEE802.11b

M. Hamalainen; J. Saloranta; J.-P. Makela; I. Oppermann; T. Patana

2003-01-01

102

Ultra-Wideband Technology for Short or Medium-Range Wireless Communications  

Microsoft Academic Search

Ultra-Wideband (UWB) technology is loosely defined as any wireless transmission scheme that occupies a bandwidth of more than 25% of a center frequency, or more than 1.5GHz. The Federal Communications Commission (FCC) is currently working on setting emissions limits that would allow UWB communication systems to be deployed on an unlicensed basis following the Part 15.209 rules for radiated emissions

Jeff Foerster; Evan Green; Srinivasa Somayazulu; David Leeper

2001-01-01

103

A lightweight, ultra wideband polarimetric W-band radar with high resolution for environmental applications  

Microsoft Academic Search

A lightweight, ultra wideband (UWB), polarimetric millimetre wave 94 GHz radar with high resolution is described for environmental and other short range applications. UWB and random signal W-band radar technologies are combined with polarimetric and super-resolution processing techniques to provide a compact remote sensing capability that is man-portable. An all-weather capability is provided for accurate and high resolution measurement of

Richard Holliday; Matt Rhys-Roberts; Duncan A. Wynn

2006-01-01

104

UWB Short-Pulse Radar: Combining Trilateration and Back Projection for Through-the-Wall Radar Imaging  

NASA Astrophysics Data System (ADS)

In this chapter, we propose a novel way to combine back projection and trilateration algorithms for through-the-wall imaging using an ultra-wideband (UWB) short-pulse radar system. The combination of the two algorithms increases the detection-localization performance. To accomplish this improvement, the multi-target localization problem of trilateration is addressed by the calculation of the root-mean-square error with regard to the estimated position and those of all possible target positions. The radar system's entire processing pipeline is described, with a focus on the imaging block. The data were acquired using a multistatic radar system with a 3.2 GHz bandwidth. Simulations and experiments indicate that our combined method outperforms other methods. Simulation and experimental results are shown, compared, and discussed.

Daho, O. B.; Khamlichi, J.; M閚ard, M.; Gaugue, A.

105

Neural and behavioral teratological evaluation of rats exposed to ultra-wideband electromagnetic fields.  

PubMed

Several investigators have reported teratologic effects of electromagnetic field exposure. The majority of these studies have been performed at levels of exposure that could produce substantial heating of the animals. New and unique sources of ultra-wideband (UWB) electromagnetic fields are currently being developed and tested that are capable of generating nonthermalizing, high-peak-power, microwave (MW) pulses with nanosecond (ns) pulse widths, picosecond (ps) rise times, and an UWB of frequencies. Our study was performed to determine if teratological changes occur in rat pups as a result of (i) daily UWB exposures during gestation days 3-18, or (ii) as a result of both prenatal and postnatal (10 days) exposures. Dams were exposed either to (i) UWB irradiation from a Kentech system that emitted a 55 kV/m-peak E field, 300 ps rise time, and a 1.8 ns pulse width, average whole-body specific absorption rate 45 mW/kg; (ii) sham irradiation; or (iii) a positive control, lead (Pb) acetate solution (2000 microg/ml) continuously available in the drinking water. Offspring were examined for ontogeny (litter size, sex-ratios, weights, coat appearance, tooth-eruption, eye-opening, air-righting, and ultrasonic stress vocalizations). Male pups were tested on various performance measures (locomotor, water-maze learning, and fertilization capabilities). The pups postnatally exposed were examined for hippocampal morphology and operant behavior. Behavioral, functional, and morphological effects of UWB exposure were unremarkable with these exceptions: (i) The UWB-exposed pups emitted significantly more stress vocalizations than the sham-exposed pups; (ii) the medial-to-lateral length of the hippocampus was significantly longer in the UWB-exposed pups than in the sham-exposed animals; (iii) male offspring exposed in utero to UWB mated significantly less frequently than sham-exposed males, but when they did mate there was no difference in fertilization and offspring numbers from the sham group. There does not appear to be a unifying physiological or behavioral relationship among the significant differences observed, and our findings could be due to the expected spurious results derived when a large number of statistical comparisons are made. Significant effects found between our positive-controls and other groups on numerous measures indicates that the techniques used were sensitive enough to detect teratological effects. Bioelectromagnetics 21:524-537, 2000. Published 2000 Wiley-Liss, Inc. PMID:11015117

Cobb, B L; Jauchem, J R; Mason, P A; Dooley, M P; Miller, S A; Ziriax, J M; Murphy, M R

2000-10-01

106

Performance Analysis of UWB Body Sensor Networks for Medical Applications  

Microsoft Academic Search

\\u000a Wireless sensor networks can be employed in medical healthcare in many tasks such as, monitoring vital signs, controlling\\u000a medical equipment, patient positioning, and in addition for non-medical service such as entertainment, psychophysiological\\u000a detection of deception. Ultra-Wideband (UWB) radio is a revolutionary, power-limited, and rapidly evolving technology, which\\u000a employs short pulses with ultra low power for communication and ranging. Compared to

Abdellah Chehri; Hussein Mouftah

2010-01-01

107

Optical generation of binary-phase-coded, direct-sequence ultra-wideband signals by polarization modulation and FBG-based multi-channel frequency discriminator.  

PubMed

In this paper a novel optical generation approach for binary-phase-coded, direct-sequence ultra-wideband (UWB) signals is experimentally demonstrated. Our system consists of a laser array, a polarization modulator (PolM), a fiber Bragg grating (FBG), a length of single mode fiber, and a photo detector (PD). The FBG, designed based on the superimposed, chirped grating, is used as the multi-channel frequency discriminator. The input electronic Gaussian pulse is modulated on the optical carrier by the PolM and then converted into UWB monocycle or doublet pulses sequence by the multi-channel frequency discriminator. The PolM is used so that the desired binary phase code pattern could be simply selected by adjusting the polarization state of each laser, rather than tuning the laser wavelengths. The desired UWB shape, monocycle or doublet, could be selected by tuning the FBG. Based on our proposed approach, four-chip, binary-phase-coded, DS-UWB sequences with different pulse shapes and code patterns are experimentally demonstrated. The impact of the fiber dispersion on the generated UWB pulses is also discussed in our paper. PMID:18542612

Ou, Pan; Zhang, Ye; Zhang, Chun-Xi

2008-03-31

108

Analysis of a multi-access scheme and asynchronous transmit-only UWB for wireless body area networks.  

PubMed

Ultra Wideband (UWB) has many favorable factors for use in a wireless body area network application. The major drawback is the high power consumption of an UWB receiver. One solution to address this problem is to use a transmit-only UWB sensor node. In this paper, we propose a multi-access scheme that is suitable for asynchronous transmit-only UWB wireless body area networks (UWB-WBAN). Each sensor attached on the patient under monitoring is assigned a unique number of UWB pulses per data bit. The number of UWB pulses assigned to the sensors is optimized to improve the bit error rate and system reliability. Simulation shows that through careful selection of the number of pulses for the sensors, it is possible to maintain almost similar bit error probability, regardless of the distance from the receiver. PMID:19964453

Keong, Ho Chee; Yuce, Mehmet R

2009-01-01

109

Three-dimensional confocal imaging for breast cancer detection using CMOS Gaussian monocycle pulse transmitter and 4 4 ultra wideband antenna array with impedance matching layer  

NASA Astrophysics Data System (ADS)

A time-domain reflectometry breast cancer detection system was developed, which was composed of a Gaussian monocycle pulse (GMP) transmitter circuit fabricated by complementary metal oxide semiconductor (CMOS) 65 nm technology and an ultra wide-band (UWB) planar slot antenna array. The center frequency and bandwidth of the antenna were 6 and 9.2 GHz, respectively. The GMP train having the pulse width of 160 ps was generated by the 65 nm CMOS logic circuit with a core area of 0.0017 mm2 and was emitted by the 4 4 planar slot antenna array. The fabricated planar 4 4 antenna array with the matching layer could resolve the two separate 5 5 5 mm3 breast tumor phantoms, which were located at the depth of 22 mm with the spacing of 8 mm.

Sugitani, Takumi; Kubota, Shinichi; Hafiz, Mohiuddin; Xiao, Xia; Kikkawa, Takamaro

2014-01-01

110

Ultra-Wideband Tracking System Design for Relative Navigation  

NASA Technical Reports Server (NTRS)

This presentation briefly discusses a design effort for a prototype ultra-wideband (UWB) time-difference-of-arrival (TDOA) tracking system that is currently under development at NASA Johnson Space Center (JSC). The system is being designed for use in localization and navigation of a rover in a GPS deprived environment for surface missions. In one application enabled by the UWB tracking, a robotic vehicle carrying equipments can autonomously follow a crewed rover from work site to work site such that resources can be carried from one landing mission to the next thereby saving up-mass. The UWB Systems Group at JSC has developed a UWB TDOA High Resolution Proximity Tracking System which can achieve sub-inch tracking accuracy of a target within the radius of the tracking baseline [1]. By extending the tracking capability beyond the radius of the tracking baseline, a tracking system is being designed to enable relative navigation between two vehicles for surface missions. A prototype UWB TDOA tracking system has been designed, implemented, tested, and proven feasible for relative navigation of robotic vehicles. Future work includes testing the system with the application code to increase the tracking update rate and evaluating the linear tracking baseline to improve the flexibility of antenna mounting on the following vehicle.

Ni, Jianjun David; Arndt, Dickey; Bgo, Phong; Dekome, Kent; Dusl, John

2011-01-01

111

Background-free millimeter-wave ultra-wideband signal generation based on a dual-parallel Mach-Zehnder modulator.  

PubMed

A novel scheme for photonic generation of a millimeter-wave ultra-wideband (MMW-UWB) signal is proposed and experimentally demonstrated based on a dual-parallel Mach-Zehnder modulator (DPMZM). In the proposed scheme, a single-frequency radio frequency (RF) signal is applied to one sub-MZM of the DPMZM to achieve optical suppressed-carrier modulation, and an electrical control pulse train is applied to the other sub-MZM biased at the minimum transmission point, to get an on/off switchable optical carrier. By filtering out the optical carrier with one of the first-order sidebands, and properly setting the amplitude of the control pulse, an MMW-UWB pulse train without the residual local oscillation is generated after photo-detection. The generated MMW-UWB signal is background-free, because the low-frequency components in the electrical spectrum are effectively suppressed. In the experiment, an MMW-UWB pulse train centered at 25 GHz with a 10-dB bandwidth of 5.5 GHz is successfully generated. The low frequency components are suppressed by 22 dB. PMID:24216925

Zhang, Fangzheng; Pan, Shilong

2013-11-01

112

Survey of Ultra-wideband Radar  

NASA Astrophysics Data System (ADS)

The development of UWB radar over the last four decades is very briefly summarized. A discussion of the meaning of UWB is followed by a short history of UWB radar developments and discussions of key supporting technologies and current UWB radars. Selected UWB radars and the associated applications are highlighted. Applications include detecting and imaging buried mines, detecting and mapping underground utilities, detecting and imaging objects obscured by foliage, through-wall detection in urban areas, short-range detection of suicide bombs, and the characterization of the impulse responses of various artificial and naturally occurring scattering objects. In particular, the Naval Research Laboratory's experimental, low-power, dual-polarized, short-pulse, ultra-high resolution radar is used to discuss applications and issues of UWB radar. Some crucial issues that are problematic to UWB radar are spectral availability, electromagnetic interference and compatibility, difficulties with waveform control/shaping, hardware limitations in the transmission chain, and the unreliability of high-power sources for sustained use above 2 GHz.

Mokole, Eric L.; Hansen, Pete

113

Design and Fabrication of Ultra-Wideband Baluns Embedded in Multilayer Liquid Crystal Polymer Flex  

Microsoft Academic Search

In this paper, we present the design and fabrication of ultra-wideband (UWB) baluns embedded in multilayer liquid crystal polymer (LCP) flex. Fabrication techniques are demonstrated for processing these commercially available LCP thin-films by standard PCB equipments. Variations in the LCP thin-film thickness are characterized and compared before and after lamination. Results show good dimensional stability of the material, a critical

Andy C. Chen; Morgan J. Chen; Anh-Vu Pham

2007-01-01

114

An ultra wideband communication channel model for the human abdominal region  

Microsoft Academic Search

Long-term implantable devices communicating with receivers in the outer human body through a wireless interface are one of the most prominent applications of micro\\/nano-technology in medicine. Ultra wideband (UWB) interfaces have great potential for the communication links of these telemedicine applications due to their inherent low power consumption, high transmission rates, and simple electronics. Novel implant medical sensors and actuators

Stig St鴄; Raul Chavez-Santiago; Ilangko Balasingham

2010-01-01

115

Locally Coherent Ultra-Wideband Radio Channel Model for Sensor Networks in Industrial Environment  

Microsoft Academic Search

We describe a new transfer function model for the static ultra-wideband (UWB) radio channel in industrial indoor environments for SPIN (sensor, positioning, and identification network) applications. The model addresses propagation between one or more transmitter and one or more receiver positions. It is locally coherent, i.e., it accounts for small scale displacements of transmitter and receiver. It is a geometry-based

J. Kunisch; J. Pamp

2006-01-01

116

Pseudo-coherent software defined Ultra wideband transmitter for ranging and communication  

Microsoft Academic Search

In this paper a pseudo-coherent software-defined impulse-radio (IR) transmitter for the Ultra wideband (UWB) technology is presented. Due to the large available bandwidth, the transmitter is perfectly suited for implementing and testing high precision ranging and positioning systems in dense multi-path indoor environments. Simultaneously, it can offer reliable and secure communication functionalities. A pseudo-coherent transmitter offers the possibility to evaluate

Christoph J. Eisner; Arndt T. Ott; Jorg Huttner; Andreas Ziroff; Thomas F. Eibert

2012-01-01

117

Optically addressed ultra-wideband phased antenna array  

NASA Astrophysics Data System (ADS)

Demands for high data rate and multifunctional apertures from both civilian and military users have motivated development of ultra-wideband (UWB) electrically steered phased arrays. Meanwhile, the need for large contiguous frequency is pushing operation of radio systems into the millimeter-wave (mm-wave) range. Therefore, modern radio systems require UWB performance from VHF to mm-wave. However, traditional electronic systems suffer many challenges that make achieving these requirements difficult. Several examples includes: voltage controlled oscillators (VCO) cannot provide a tunable range of several octaves, distribution of wideband local oscillator signals undergo high loss and dispersion through RF transmission lines, and antennas have very limited bandwidth or bulky sizes. Recently, RF photonics technology has drawn considerable attention because of its advantages over traditional systems, with the capability of offering extreme power efficiency, information capacity, frequency agility, and spatial beam diversity. A hybrid RF photonic communication system utilizing optical links and an RF transducer at the antenna potentially provides ultra-wideband data transmission, i.e., over 100 GHz. A successful implementation of such an optically addressed phased array requires addressing several key challenges. Photonic generation of an RF source with over a seven-octave bandwidth has been demonstrated in the last few years. However, one challenge which still remains is how to convey phased optical signals to downconversion modules and antennas. Therefore, a feed network with phase sweeping capability and low excessive phase noise needs to be developed. Another key challenge is to develop an ultra-wideband array antenna. Modern frontends require antennas to be compact, planar, and low-profile in addition to possessing broad bandwidth, conforming to stringent space, weight, cost, and power constraints. To address these issues, I will study broadband and miniaturization techniques for both single and array antennas. In addition, a prototype transmitting phased array system is developed and shown to demonstrate large bandwidth as well as a beam steering capability. The architecture of this system can be further developed to a large-scale array at higher frequencies such as mm-wave. This solution serves as a candidate for UWB multifunctional frontends.

Bai, Jian

118

Photonic generation of UWB pulses with pulse position modulation  

E-print Network

a two- or three-tap photonic micro- wave delay-line filter with one negative coefficient for polarity (PMF) with a polariser, which performs as a two-tap photonic microwave delay-line filter with one delay-line filter for UWB monocycle pulse generation, the second subsystem being a pulse

Yao, Jianping

119

Ultra-wideband impedance sensor  

DOEpatents

The ultra-wideband impedance sensor (UWBZ sensor, or Z-sensor) is implemented in differential and single-ended configurations. The differential UWBZ sensor employs a sub-nanosecond impulse to determine the balance of an impedance bridge. The bridge is configured as a differential sample-and-hold circuit that has a reference impedance side and an unknown impedance side. The unknown impedance side includes a short transmission line whose impedance is a function of the near proximity of objects. The single-ended UWBZ sensor eliminates the reference side of the bridge and is formed of a sample and hold circuit having a transmission line whose impedance is a function of the near proximity of objects. The sensing range of the transmission line is bounded by the two-way travel time of the impulse, thereby eliminating spurious Doppler modes from large distant objects that would occur in a microwave CW impedance bridge. Thus, the UWBZ sensor is a range-gated proximity sensor. The Z-sensor senses the near proximity of various materials such as metal, plastic, wood, petroleum products, and living tissue. It is much like a capacitance sensor, yet it is impervious to moisture. One broad application area is the general replacement of magnetic sensors, particularly where nonferrous materials need to be sensed. Another broad application area is sensing full/empty levels in tanks, vats and silos, e.g., a full/empty switch in water or petroleum tanks.

McEwan, Thomas E. (Livermore, CA)

1999-01-01

120

Ultra-wideband impedance sensor  

DOEpatents

The ultra-wideband impedance sensor (UWBZ sensor, or Z-sensor) is implemented in differential and single-ended configurations. The differential UWBZ sensor employs a sub-nanosecond impulse to determine the balance of an impedance bridge. The bridge is configured as a differential sample-and-hold circuit that has a reference impedance side and an unknown impedance side. The unknown impedance side includes a short transmission line whose impedance is a function of the near proximity of objects. The single-ended UWBZ sensor eliminates the reference side of the bridge and is formed of a sample and hold circuit having a transmission line whose impedance is a function of the near proximity of objects. The sensing range of the transmission line is bounded by the two-way travel time of the impulse, thereby eliminating spurious Doppler modes from large distant objects that would occur in a microwave CW impedance bridge. Thus, the UWBZ sensor is a range-gated proximity sensor. The Z-sensor senses the near proximity of various materials such as metal, plastic, wood, petroleum products, and living tissue. It is much like a capacitance sensor, yet it is impervious to moisture. One broad application area is the general replacement of magnetic sensors, particularly where nonferrous materials need to be sensed. Another broad application area is sensing full/empty levels in tanks, vats and silos, e.g., a full/empty switch in water or petroleum tanks. 2 figs.

McEwan, T.E.

1999-03-16

121

Ultra-wideband microwave imaging of breast cancer tumors via Bayesian inverse scattering  

NASA Astrophysics Data System (ADS)

We develop a new algorithm for ultra-wideband (UWB) microwave imaging of breast cancer tumors using Bayesian inverse scattering. A key feature of the proposed algorithm is that constitutive properties of breast tissues are reconstructed from scattered UWB microwave signals together with the confidence level of the reconstruction. Having such confidence level enables minimization of both false alarms and missed detections. Results from the application of the proposed algorithm demonstrate the accuracy in estimating both location and permittivity of breast tumors without the need for a priori knowledge of pointwise properties of the background breast tissue.

Fouda, A. E.; Teixeira, F. L.

2014-02-01

122

Compact electromagnetic bandgap structures for notch band in ultra-wideband applications.  

PubMed

This paper introduces a novel approach to create notch band filters in the front-end of ultra-wideband (UWB) communication systems based on electromagnetic bandgap (EBG) structures. The concept presented here can be implemented in any structure that has a microstrip in its configuration. The EBG structure is first analyzed using a full wave electromagnetic solver and then optimized to work at WLAN band (5.15-5.825 GHz). Two UWB passband filters are used to demonstrate the applicability and effectiveness of the novel EBG notch band feature. Simulation results are provided for two cases studied. PMID:22163430

Rotaru, Mihai; Sykulski, Jan

2010-01-01

123

Compact Electromagnetic Bandgap Structures for Notch Band in Ultra-Wideband Applications  

PubMed Central

This paper introduces a novel approach to create notch band filters in the front-end of ultra-wideband (UWB) communication systems based on electromagnetic bandgap (EBG) structures. The concept presented here can be implemented in any structure that has a microstrip in its configuration. The EBG structure is first analyzed using a full wave electromagnetic solver and then optimized to work at WLAN band (5.155.825 GHz). Two UWB passband filters are used to demonstrate the applicability and effectiveness of the novel EBG notch band feature. Simulation results are provided for two cases studied. PMID:22163430

Rotaru, Mihai; Sykulski, Jan

2010-01-01

124

A 0.13?m CMOS 4-channel UWB timed array transmitter chipset with sub-200ps switches and all-digital timing circuitry  

Microsoft Academic Search

A 4-channel ultra wideband timed array transmitter chipset is reported in 0.13 mum CMOS technology that is suitable for radar and imaging applications. It consists of an all-digital timing control and impulse generation circuitry chip and a set of UWB pulse forming switches. The all-digital chip creates desired delayed versions of an input pulse sequence, which may be coded and\\/or

Zahra Safarian; Ta-Shun Chu; Hossein Hashemi

2008-01-01

125

Ultra-wideband radar sensors and networks  

DOEpatents

Ultra wideband radar motion sensors strategically placed in an area of interest communicate with a wireless ad hoc network to provide remote area surveillance. Swept range impulse radar and a heart and respiration monitor combined with the motion sensor further improves discrimination.

Leach, Jr., Richard R; Nekoogar, Faranak; Haugen, Peter C

2013-08-06

126

Method of remote powering and detecting multiple UWB passive tags in an RFID system  

SciTech Connect

A new Radio Frequency Identification (RFID), tracking, powering apparatus/system and method using coded Ultra-wideband (UWB) signaling is introduced. The proposed hardware and techniques disclosed herein utilize a plurality of passive UWB transponders in a field of an RFID-radar system. The radar system itself enables multiple passive tags to be remotely powered (activated) at about the same time frame via predetermined frequency UWB pulsed formats. Once such tags are in an activated state, an UWB radar transmits specific "interrogating codes" to put predetermined tags in an awakened status. Such predetermined tags can then communicate by a unique "response code" so as to be detected by an UWB system using radar methods.

Dowla, Farid U. (Castro Valley, CA); Nekoogar, Faranak (San Ramon, CA); Benzel, David M. (Livermore, CA); Dallum, Gregory E. (Livermore, CA); Spiridon, Alex (Palo Alto, CA)

2012-05-29

127

Software-Defined Ultra-wideband Radio Communications: A New RF Technology for Emergency Response Applications  

SciTech Connect

Reliable wireless communication links for local-area (short-range) and regional (long-range) reach capabilities are crucial for emergency response to disasters. Lack of a dependable communication system can result in disruptions in the situational awareness between the local responders in the field and the emergency command and control centers. To date, all wireless communications systems such as cell phones and walkie-talkies use narrowband radio frequency (RF) signaling for data communication. However, the hostile radio propagation environment caused by collapsed structures and rubble in various disaster sites results in significant degradation and attenuation of narrowband RF signals, which ends up in frequent communication breakdowns. To address the challenges of reliable radio communication in disaster fields, we propose an approach to use ultra-wideband (UWB) or wideband RF waveforms for implementation on Software Defined Radio (SDR) platforms. Ultra-wideband communications has been proven by many research groups to be effective in addressing many of the limitations faced by conventional narrowband radio technologies. In addition, LLNL's radio and wireless team have shown significant success in field deployment of various UWB communications system for harsh environments based on LLNL's patented UWB modulation and equalization techniques. Furthermore, using software defined radio platform for UWB communications offers a great deal of flexibility in operational parameters and helps the radio system to dynamically adapt itself to its environment for optimal performance.

Nekoogar, F; Dowla, F

2009-10-19

128

A compact ultra wideband antenna with WiMax band rejection for energy scavenging  

NASA Astrophysics Data System (ADS)

Radio Frequency (RF) energy harvesting has been rapidly advancing as a promising alternative to existing energy scavenging system. A well designed broadband antenna such as ultra-wideband (UWB) antenna can be used as one of the major components in an RF energy scavenging system. This paper presents a compact UWB antenna showing good impedance matching over a bandwidth of 2.8 to 11 GHz, suiTable for broadband RF energy scavenging. Nevertheless, the antenna usage in wireless communication has a limitation due to the problem of interference between UWB system and other narrowband systems. Thus, the proposed antenna is successfully designed with a single band-notched at the targeted WiMAX operating band of 3.3 to 3.6 GHz.

Jalil, Y. E.; Kasi, B.; Chakrabarty, C. K.

2013-06-01

129

UTag: Long-range Ultra-wideband Passive Radio Frequency Tags  

SciTech Connect

Long-range, ultra-wideband (UWB), passive radio frequency (RF) tags are key components in Radio Frequency IDentification (RFID) system that will revolutionize inventory control and tracking applications. Unlike conventional, battery-operated (active) RFID tags, LLNL's small UWB tags, called 'UTag', operate at long range (up to 20 meters) in harsh, cluttered environments. Because they are battery-less (that is, passive), they have practically infinite lifetimes without human intervention, and they are lower in cost to manufacture and maintain than active RFID tags. These robust, energy-efficient passive tags are remotely powered by UWB radio signals, which are much more difficult to detect, intercept, and jam than conventional narrowband frequencies. The features of long range, battery-less, and low cost give UTag significant advantage over other existing RFID tags.

Dowla, F

2007-03-14

130

a Novel Small Printed Ultra-Wideband Antenna for Near-Field Imaging  

NASA Astrophysics Data System (ADS)

Ultra-wideband (UWB) antennas have been suggested recently for use in near field imaging systems. A small printed antenna is introduced with L-shaped reduced ground-plane to achieve UWB characteristics. The ground is optimized to allow reconfiguration of the inspection system to various operation sub-bands. Design and optimization of antenna characteristics including matching and bandwidth are performed using FDTD computational modeling of the antenna in free space as well as in the proximity to human head phantom. Effect of tumor model is investigated on field map values. Experimental validation of antenna characteristics is studied using human brain simulating liquid, and implementing a six-degree-of-freedom robot to control the scanning of the measurement sensors. Results of this research should help enhance UWB systems as promising nondestructive and noninvasive imaging tools.

Elshafiey, Ibrahim; Sheta, Abdel-Fattah; Alkanhal, Majeed A.; Alhekail, Zeyad; AlOrainy, Abdullah

2009-03-01

131

Hardware channel model for ultra wideband systems  

Microsoft Academic Search

We present a digital hardware model for ultra wideband channels. The system runs at 80 MHz on a Xilinx Virtex-4 xc4vsx35 FPGA. High-speed arithmetic operations including division, square root, powering and normal random number generator are analyzed and developed for use as basic components in the channel emulator. The design flow is based on Matlab Simulink as the model builder,

Wen-Chih Kan; Gerald E. Sobelman

2006-01-01

132

UWB delay and multiply receiver  

DOEpatents

An ultra-wideband (UWB) delay and multiply receiver is formed of a receive antenna; a variable gain attenuator connected to the receive antenna; a signal splitter connected to the variable gain attenuator; a multiplier having one input connected to an undelayed signal from the signal splitter and another input connected to a delayed signal from the signal splitter, the delay between the splitter signals being equal to the spacing between pulses from a transmitter whose pulses are being received by the receive antenna; a peak detection circuit connected to the output of the multiplier and connected to the variable gain attenuator to control the variable gain attenuator to maintain a constant amplitude output from the multiplier; and a digital output circuit connected to the output of the multiplier.

Dallum, Gregory E.; Pratt, Garth C.; Haugen, Peter C.; Romero, Carlos E.

2013-09-10

133

Radio resource sharing for ad hoc networking with UWB  

Microsoft Academic Search

Ultra-wideband (UWB) radio is becoming a promising field for new generation's digital communication systems. This technique, based mainly on the impulse radio paradigm, offers great flexibility and shows enormous potential in view of a future broadband wireless access. We present the main principles to design a multiaccess scheme based on UWB. The potential of UWB is exploited within a distributed

Francesca Cuomo; Cristina Martello; Andrea Baiocchi; Fabrizio Capriotti

2002-01-01

134

The effects of the human body on UWB signal propagation in an indoor environment  

Microsoft Academic Search

Ultra-wideband (UWB) communication systems are investigated for their ability to operate in dense multipath environments. While a great deal of time and effort has been spent characterizing both the indoor and outdoor UWB channels, the effects of human body interaction with a close proximity UWB antenna remains unexplored. Measurements of a commercially available UWB antenna performance in an anechoic chamber

T. B. Welch; Randall L. Musselman; Bomono A. Emessiene; Phillip D. Gift; Daniel K. Choudhury; Derek N. Cassadine; Scott M. Yano

2002-01-01

135

Signal processing techniques for stepped frequency ultra-wideband radar  

NASA Astrophysics Data System (ADS)

The U.S. Army Research Laboratory (ARL) has developed the impulse-based, ground vehicle-based, forward-looking ultra-wideband (UWB), synthetic aperture radar (SAR) to detect concealed targets. Although the impulse-based architecture offers its own advantages, one of the important challenges is that when using this architecture it is very difficult to transmit a radar signal with an arbitrary bandwidth and shape. This feature is crucial for the radar to be compliant with the local frequency authority. In addition, being able to transmit signals with an arbitrary spectral shape is an important step in creating the next generation of smart (cognitive) radars. Therefore, we have designed a next-generation prototype radar to take advantage of the stepped frequency architecture. The design and building of the radar hardware is underway. In this paper, we study the radar transmit and acquisition scheme; the trade-offs between SAR image performance and various key radar parameters; and data reconstruction techniques for radar signals with an arbitrary spectrum. This study demonstrates performance, provides some guidelines for the radar design, and serves as a foundation for the signal and image processing stage.

Nguyen, Lam

2014-05-01

136

Ultra-wideband horn antenna with abrupt radiator  

DOEpatents

An ultra-wideband horn antenna transmits and receives impulse waveforms for short-range radars and impulse time-of flight systems. The antenna reduces or eliminates various sources of close-in radar clutter, including pulse dispersion and ringing, sidelobe clutter, and feedline coupling into the antenna. Dispersion is minimized with an abrupt launch point radiator element; sidelobe and feedline coupling are minimized by recessing the radiator into a metallic horn. Low frequency cut-off associated with a horn is extended by configuring the radiator drive impedance to approach a short circuit at low frequencies. A tapered feed plate connects at one end to a feedline, and at the other end to a launcher plate which is mounted to an inside wall of the horn. The launcher plate and feed plate join at an abrupt edge which forms the single launch point of the antenna. 8 figs.

McEwan, T.E.

1998-05-19

137

Ultra-wideband horn antenna with abrupt radiator  

DOEpatents

An ultra-wideband horn antenna transmits and receives impulse waveforms for short-range radars and impulse time-of flight systems. The antenna reduces or eliminates various sources of close-in radar clutter, including pulse dispersion and ringing, sidelobe clutter, and feedline coupling into the antenna. Dispersion is minimized with an abrupt launch point radiator element; sidelobe and feedline coupling are minimized by recessing the radiator into a metallic horn. Low frequency cut-off associated with a horn is extended by configuring the radiator drive impedance to approach a short circuit at low frequencies. A tapered feed plate connects at one end to a feedline, and at the other end to a launcher plate which is mounted to an inside wall of the horn. The launcher plate and feed plate join at an abrupt edge which forms the single launch point of the antenna.

McEwan, Thomas E. (Livermore, CA)

1998-01-01

138

Very small UWB antenna for WBAN applications  

Microsoft Academic Search

The increasing demand for lightweight and miniature size of Ultra-Wideband (UWB) applications in wireless communications such as Body Area Network (BAN), requires the design of very small UWB antennas. One of the main element of wireless body area network is an antenna, and there are numerous concerns to consider while designing an on-body antenna, including power consumption, size, frequency, required

Kamya Yekeh Yazdandoost; Kiyoshi Hamaguchi

2011-01-01

139

208 IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, VOL. 11, NO. 5, MAY 2001 Novel Low-Cost Ultra-Wideband, Ultra-Short-Pulse  

E-print Network

generated using spark gaps [1]. Recently, a monocycle pulse generator has been developed using Schottky of this letter was arranged by Associate Editor Dr. Arvind Sharma. J. S. Lee is with Filtronic Solid State, Santa

Arslan, H黶eyin

140

Fiber-distributed Ultra-wideband noise radar with steerable power spectrum and colorless base station.  

PubMed

A fiber-distributed Ultra-wideband (UWB) noise radar was achieved, which consists of a chaotic UWB noise source based on optoelectronic oscillator (OEO), a fiber-distributed transmission link, a colorless base station (BS), and a cross-correlation processing module. Due to a polarization modulation based microwave photonic filter and an electrical UWB pass-band filter embedded in the feedback loop of the OEO, the power spectrum of chaotic UWB signal could be shaped and notch-filtered to avoid the spectrum-overlay-induced interference to the narrow band signals. Meanwhile, the wavelength-reusing could be implemented in the BS by means of the distributed polarization modulation-to-intensity modulation conversion. The experimental comparison for range finding was carried out as the chaotic UWB signal was notch-filtered at 5.2 GHz and 7.8 GHz or not. Measured results indicate that space resolution with cm-level could be realized after 3-km fiber transmission thanks to the excellent self-correlation property of the UWB noise signal provided by the OEO. The performance deterioration of the radar raised by the energy loss of the notch-filtered noise signal was negligible. PMID:24663829

Zheng, Jianyu; Wang, Hui; Fu, Jianbin; Wei, Li; Pan, Shilong; Wang, Lixian; Liu, Jianguo; Zhu, Ninghua

2014-03-10

141

Full-duplex multiband orthogonal frequency division multiplexing ultra-wideband over fiber system  

NASA Astrophysics Data System (ADS)

A full-duplex multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband over fiber (UWBoF) system is proposed, and bidirectional transmission of a 1.28-Gbps MB-OFDM UWB signal over 50-km standard single-mode fiber (SSMF) is demonstrated. An optical remote heterodyning mixing scheme is employed to generate a 60-GHz optical millimeter wave. Meanwhile, an optical carrier without modulation data is extracted by using a fiber Bragg grating for the uplink MB-OFDM UWB signal transmission. After 50-km SSMF transmission at a bit error rate of 110-4, the power penalties are 0.7 dB for a 4 quadrature amplitude modulation (QAM)-uplink and 1.0 dB for a 16QAM-uplink, respectively. The proposed scheme would greatly reduce the cost and significantly improve the spectrum utilization efficiency in the full-duplex MB-OFDM UWBoF systems.

He, Jing; Wen, Xuejie; Chen, Ming; Chen, Lin; Su, Jinshu

2015-01-01

142

Ultra-Wideband Time-Difference-of-Arrival High Resolution 3D Proximity Tracking System  

NASA Technical Reports Server (NTRS)

This paper describes a research and development effort for a prototype ultra-wideband (UWB) tracking system that is currently under development at NASA Johnson Space Center (JSC). The system is being studied for use in tracking of lunar./Mars rovers and astronauts during early exploration missions when satellite navigation systems are not available. U IATB impulse radio (UWB-IR) technology is exploited in the design and implementation of the prototype location and tracking system. A three-dimensional (3D) proximity tracking prototype design using commercially available UWB products is proposed to implement the Time-Difference- Of-Arrival (TDOA) tracking methodology in this research effort. The TDOA tracking algorithm is utilized for location estimation in the prototype system, not only to exploit the precise time resolution possible with UWB signals, but also to eliminate the need for synchronization between the transmitter and the receiver. Simulations show that the TDOA algorithm can achieve the fine tracking resolution with low noise TDOA estimates for close-in tracking. Field tests demonstrated that this prototype UWB TDOA High Resolution 3D Proximity Tracking System is feasible for providing positioning-awareness information in a 3D space to a robotic control system. This 3D tracking system is developed for a robotic control system in a facility called "Moonyard" at Honeywell Defense & System in Arizona under a Space Act Agreement.

Ni, Jianjun; Arndt, Dickey; Ngo, Phong; Phan, Chau; Dekome, Kent; Dusl, John

2010-01-01

143

Ultra-wideband Propagation Loss Around a Human Body in Various Surrounding Environments  

NASA Astrophysics Data System (ADS)

Ultra-wideband (UWB) technologies have been anticipated for use in wireless body area networks (WBAN) because of their low power consumption and anti-multipath capabilities. This chapter presents the UWB (3.1-10.6 GHz) propagation loss in WBAN scenarios between on-body antennas in three different surrounding environments. The measurements were performed in a 3-m radio anechoic chamber, a classroom, and a small room. The propagation paths were roughly divided into line-of-sight (LOS) and non-LOS (NLOS) ones. Small rooms, particularly NLOS, yielded higher reception power than larger rooms. This was attributed to the ample multipath from the nearby floor, walls, and ceiling. The UWB maximum propagation losses in three surrounding environments were smaller than ones of CW (6.85 GHz). This is because nulls caused by interference were cancelled out by the ultra-wide bandwidth. The propagation losses of low-band (3.4-4.8 GHz) and high-band (7.25-10.25 GHz) UWB were also evaluated. In WBAN scenarios, the low-band yielded lower propagation loss than the high-band and approximately the same loss as the full-band UWB (3.1-10.6 GHz).

Yamamoto, H.; Kobayashi, T.

144

An Ultra Wideband Aperture Coupled Bowtie Antenna for Communications  

NASA Astrophysics Data System (ADS)

The application of ultra wideband communications lies mainly in the networking of portable devices like camcorders, digital cameras and personal digital assistants (PDA). This constitutes the need for small ultra-wideband antennas that can be integrated into such devices. With this motivation an investigation of the new aperture coupled bowtie antenna concept is presented together with design rules and measurement results of the frequency domain and time domain characteristics.

S鰎gel, W.; Waldschmidt, C.; Wiesbeck, W.

145

Waveform Analysis of UWB GPR Antennas.  

PubMed

Ground Penetrating Radar (GPR) systems fall into the category of ultra-wideband (UWB) devices. Most GPR equipment covers a frequency range between an octave and a decade by using short-time pulses. Each signal recorded by a GPR gathers a temporal log of attenuated and distorted versions of these pulses (due to the effect of the propagation medium) plus possible electromagnetic interferences and noise. In order to make a good interpretation of this data and extract the most possible information during processing, a deep knowledge of the wavelet emitted by the antennas is essential. Moreover, some advanced processing techniques require specific knowledge of this signal to obtain satisfactory results. In this work, we carried out a series of tests in order to determine the source wavelet emitted by a ground-coupled antenna with a 500 MHz central frequency. PMID:22573965

Rial, Fernando I; Lorenzo, Henrique; Pereira, Manuel; Armesto, Julia

2009-01-01

146

Waveform Analysis of UWB GPR Antennas  

PubMed Central

Ground Penetrating Radar (GPR) systems fall into the category of ultra-wideband (UWB) devices. Most GPR equipment covers a frequency range between an octave and a decade by using short-time pulses. Each signal recorded by a GPR gathers a temporal log of attenuated and distorted versions of these pulses (due to the effect of the propagation medium) plus possible electromagnetic interferences and noise. In order to make a good interpretation of this data and extract the most possible information during processing, a deep knowledge of the wavelet emitted by the antennas is essential. Moreover, some advanced processing techniques require specific knowledge of this signal to obtain satisfactory results. In this work, we carried out a series of tests in order to determine the source wavelet emitted by a ground-coupled antenna with a 500 MHz central frequency. PMID:22573965

Rial, Fernando I.; Lorenzo, Henrique; Pereira, Manuel; Armesto, Julia

2009-01-01

147

A Distributed RF Front-End for UWB Receivers  

Microsoft Academic Search

This paper presents the design and fabrication of a novel silicon-based distributed RF front-end for ultra wideband (UWB) receivers (RX). The proposed UWB distributed RF front-end, called UWB-DRF, is suitable for UWB IF transceiver architectures. The circuit constitutes of combined low-noise amplifier (LNA) and down-conversion mixer cells distributed along the artificial transmission lines (TLs), to achieve wideband conversion gain, noise

A. Safarian; Lei Zhou; P. Heydari

2006-01-01

148

Generalized equivalent circuit model for ultra wideband antenna structure with double steps for energy scavenging  

NASA Astrophysics Data System (ADS)

There are various types of UWB antennas can be used to scavenge energy from the air and one of them is the printed disc monopole antenna. One of the new challenges imposed on ultra wideband is the design of a generalized antenna circuit model. It is developed in order to extract the inductance and capacitance values of the UWB antennas. In this research work, the developed circuit model can be used to represent the rectangular printed disc monopole antenna with double steps. The antenna structure is simulated with CST Microwave Studio, while the circuit model is simulated with AWR Microwave Office. In order to ensure the simulation result from the circuit model is accurate, the circuit model is also simulated using Mathlab program. The developed circuit model is found to be able to depict the actual UWB antenna. Energy harvesting from environmental wirelessly is an emerging method, which forms a promising alternative to existing energy scavenging system. The developed UWB can be used to scavenge wideband energy from electromagnetic wave present in the environment.

>Oon Kheng Heong, Goh Chin; Chakrabarty, Chandan Kumar; >Goh Tian Hock,

2013-06-01

149

UWB medical diagnostic: in-body transmission modeling and applications  

Microsoft Academic Search

The feasibility of medical diagnostic through Ultra Wideband technology is investigated, both from a system point of view and a component design perspective. The characteristics and the properties of the in-body UWB electromagnetic wave propagation are assessed and from them requirements on the system design are derived. Moreover, a system concept for medical diagnostic purposes based on the UWB Radar

Elena Pancera; Xuyang Li; Malyhe Jalilvand; Thomas Zwick; Werner Wiesbeck

2011-01-01

150

Transmission and Reception by Ultra-Wideband (UWB) Antennas  

Microsoft Academic Search

Broadband antennas are very useful in many applications because they operate over a wide range of frequencies. The objective of this paper is to study the transient responses of various well-known antennas over broad frequency ranges. As such, the phase responses of these antennas as a function of frequency are of great interest. In the ensuing analysis, each antenna is

Debalina Ghosh; Arijit de; Mary Taylor; Tapan Sarkar; Michael Wicks; Eric Mokole

2006-01-01

151

Impact of difference in WBAN channel models on UWB system performance  

Microsoft Academic Search

In this paper, the performances of two singleband ultra wideband (UWB) systems, i.e., direct sequence UWB (DS-UWB) and UWB frequency modulation (UWB-FM) are studied in two different channel models to reveal an impact of a channel model on the system's performance. The applied channel models are the experimental wireless body area network (WBAN) channel model developed at the Centre for

Harri Viittala; Matti H鋗鋖鋓nen; Jari Iinatti

2010-01-01

152

Ultra wideband ground penetrating radar imaging of heterogeneous solids  

DOEpatents

A non-invasive imaging system for analyzing engineered structures comprises pairs of ultra wideband radar transmitters and receivers in a linear array that are connected to a timing mechanism that allows a radar echo sample to be taken at a variety of delay times for each radar pulse transmission. The radar transmitters and receivers are coupled to a position determining system that provides the x,y position on a surface for each group of samples measured for a volume from the surface. The radar transmitter and receivers are moved about the surface, e.g., attached to the bumper of a truck, to collect such groups of measurements from a variety of x,y positions. Return signal amplitudes represent the relative reflectivity of objects within the volume and the delay in receiving each signal echo represents the depth at which the object lays in the volume and the propagation speeds of the intervening material layers. Successively deeper z-planes are backward propagated from one layer to the next with an adjustment for variations in the expected propagation velocities of the material layers that lie between adjacent z-planes.

Warhus, John P. (Brentwood, CA); Mast, Jeffrey E. (Livermore, CA)

1998-01-01

153

Ultra wideband ground penetrating radar imaging of heterogeneous solids  

DOEpatents

A non-invasive imaging system for analyzing engineered structures comprises pairs of ultra wideband radar transmitters and receivers in a linear array that are connected to a timing mechanism that allows a radar echo sample to be taken at a variety of delay times for each radar pulse transmission. The radar transmitters and receivers are coupled to a position determining system that provides the x,y position on a surface for each group of samples measured for a volume from the surface. The radar transmitter and receivers are moved about the surface, e.g., attached to the bumper of a truck, to collect such groups of measurements from a variety of x,y positions. Return signal amplitudes represent the relative reflectivity of objects within the volume and the delay in receiving each signal echo represents the depth at which the object lays in the volume and the propagation speeds of the intervening material layers. Successively deeper z-planes are backward propagated from one layer to the next with an adjustment for variations in the expected propagation velocities of the material layers that lie between adjacent z-planes. 11 figs.

Warhus, J.P.; Mast, J.E.

1998-11-10

154

3D positioning scheme exploiting nano-scale IR-UWB orthogonal pulses  

NASA Astrophysics Data System (ADS)

In these days, the development of positioning technology for realizing ubiquitous environments has become one of the most important issues. The Global Positioning System (GPS) is a well-known positioning scheme, but it is not suitable for positioning in in-door/building environments because it is difficult to maintain line-of-sight condition between satellites and a GPS receiver. To such problem, various positioning methods such as RFID, WLAN, ZigBee, and Bluetooth have been developed for indoor positioning scheme. However, the majority of positioning schemes are focused on the two-dimension positioning even though three-dimension (3D) positioning information is more useful especially in indoor applications, such as smart space, U-health service, context aware service, etc. In this paper, a 3D positioning system based on mutually orthogonal nano-scale impulse radio ultra-wideband (IR-UWB) signals and cross array antenna is proposed. The proposed scheme uses nano-scale IR-UWB signals providing fine time resolution and high-resolution multiple signal specification algorithm for the time-of-arrival and the angle-of-arrival estimation. The performance is evaluated over various IEEE 802.15.4a channel models, and simulation results show the effectiveness of proposed scheme.

Kim, Nammoon; Kim, Youngok

2011-10-01

155

3D positioning scheme exploiting nano-scale IR-UWB orthogonal pulses.  

PubMed

In these days, the development of positioning technology for realizing ubiquitous environments has become one of the most important issues. The Global Positioning System (GPS) is a well-known positioning scheme, but it is not suitable for positioning in in-door/building environments because it is difficult to maintain line-of-sight condition between satellites and a GPS receiver. To such problem, various positioning methods such as RFID, WLAN, ZigBee, and Bluetooth have been developed for indoor positioning scheme. However, the majority of positioning schemes are focused on the two-dimension positioning even though three-dimension (3D) positioning information is more useful especially in indoor applications, such as smart space, U-health service, context aware service, etc. In this paper, a 3D positioning system based on mutually orthogonal nano-scale impulse radio ultra-wideband (IR-UWB) signals and cross array antenna is proposed. The proposed scheme uses nano-scale IR-UWB signals providing fine time resolution and high-resolution multiple signal specification algorithm for the time-of-arrival and the angle-of-arrival estimation. The performance is evaluated over various IEEE 802.15.4a channel models, and simulation results show the effectiveness of proposed scheme. PMID:21970578

Kim, Nammoon; Kim, Youngok

2011-01-01

156

3D positioning scheme exploiting nano-scale IR-UWB orthogonal pulses  

PubMed Central

In these days, the development of positioning technology for realizing ubiquitous environments has become one of the most important issues. The Global Positioning System (GPS) is a well-known positioning scheme, but it is not suitable for positioning in in-door/building environments because it is difficult to maintain line-of-sight condition between satellites and a GPS receiver. To such problem, various positioning methods such as RFID, WLAN, ZigBee, and Bluetooth have been developed for indoor positioning scheme. However, the majority of positioning schemes are focused on the two-dimension positioning even though three-dimension (3D) positioning information is more useful especially in indoor applications, such as smart space, U-health service, context aware service, etc. In this paper, a 3D positioning system based on mutually orthogonal nano-scale impulse radio ultra-wideband (IR-UWB) signals and cross array antenna is proposed. The proposed scheme uses nano-scale IR-UWB signals providing fine time resolution and high-resolution multiple signal specification algorithm for the time-of-arrival and the angle-of-arrival estimation. The performance is evaluated over various IEEE 802.15.4a channel models, and simulation results show the effectiveness of proposed scheme. PMID:21970578

2011-01-01

157

Multi-pulse multi-delay (MPMD) multiple access modulation for UWB  

DOEpatents

A new modulation scheme in UWB communications is introduced. This modulation technique utilizes multiple orthogonal transmitted-reference pulses for UWB channelization. The proposed UWB receiver samples the second order statistical function at both zero and non-zero lags and matches the samples to stored second order statistical functions, thus sampling and matching the shape of second order statistical functions rather than just the shape of the received pulses.

Dowla, Farid U.; Nekoogar, Faranak

2007-03-20

158

Technical note: a novel approach to the detection of estrus in dairy cows using ultra-wideband technology.  

PubMed

Detection of estrus is a key determinant of profitability of dairy herds, but estrus is increasingly difficult to observe in the modern dairy cow with shorter duration and less-intense estrus. Concurrent with the unfavorable correlation between milk yield and fertility, estrus-detection rates have declined to less than 50%. We tested ultra-wideband (UWB) radio technology (Thales Research & Technology Ltd., Reading, UK) for proof of concept that estrus could be detected in dairy cows (two 1-wk-long trials; n=16 cows, 8 in each test). The 3-dimensional positions of 12 cows with synchronized estrous cycles and 4 pregnant control cows were monitored continuously using UWB mobile units operating within a network of 8 base units for a period of 7d. In the study, 10 cows exhibited estrus as confirmed by visual observation, activity monitoring, and milk progesterone concentrations. Automated software was developed for analysis of UWB data to detect cows in estrus and report the onset of estrus in real time. The UWB technology accurately detected 9 out of 10 cows in estrus. In addition, UWB technology accurately confirmed all 6 cows not in estrus. In conclusion, UWB technology can accurately detect estrus and hence we have demonstrated proof of concept for a novel technology that has significant potential to improve estrus-detection rates. PMID:23910546

Homer, E M; Gao, Y; Meng, X; Dodson, A; Webb, R; Garnsworthy, P C

2013-10-01

159

Dispersion Limitations of Ultra-Wideband Wireless Links and Their Compensation Via Photonically Enabled Arbitrary Waveform Generation  

Microsoft Academic Search

In this study, we present compression of ultra-wideband RF waveforms via photonic synthesis of phase pre-compensated waveforms. By exciting a dispersive wireless link (employing Archimedean spiral antennas) with variable-bandwidth excitation waveforms, we first demonstrate that such links exhibit a dispersion-limited output pulse duration. Subsequently, we utilize the RF spectral phase extracted from the impulse response of the link to create

Jason D. McKinney; Dimitrios Peroulis; Andrew M. Weiner

2008-01-01

160

Ultra wideband radar for water detection in the human body  

Microsoft Academic Search

In this paper an Impulse Radio Ultra Wideband (IRUWB) radar for detecting water accumulation in the human body is proposed. The method of On-body water detection is investigated both in a simulator with a bladder model and measurement system with a phantom. The Vivaldi antenna is used in the measurement system. The simulation and measurement results show the feasibility of

Xuyang Li; Elena Pancera; Lukasz Zwirello; Huaming Wu; Thomas Zwick

2010-01-01

161

Ultra-wideband EM modeling using DCI-PEEC method  

Microsoft Academic Search

This paper presents the DCI-PEEC method in the application of electromagnetic simulation. The exact full-wave Green's function for multi-layered media from discrete complex image (DCI) makes partial element equivalent circuit (PEEC) method available for the ultra-wideband modeling. An example of S parameter calculation for on-chip spiral inductor verifies this method.

Zhi-Yuan Zong; Wen Wu; Da-Gang Fang

2010-01-01

162

Recent Progress in Ultra-Wideband Microwave Breast Cancer Detection  

E-print Network

Recent Progress in Ultra-Wideband Microwave Breast Cancer Detection Simone A. Winkler, Emily Porter in the field of breast cancer detection research carried out at McGill University. A low-cost time performance. Latest results are shown and presented in comparison to prior experiments. Keywords-breast cancer

Coates, Mark

163

A UWB wireless capsule endoscopy device.  

PubMed

Wireless capsule endoscopy (WCE) presents many advantages over traditional wired endoscopic methods. The performance of WCE devices can be improved using high-frequency communication systems such as Impulse Radio-Ultra-Wideband (IR-UWB) to enable a high data rate transmission with low-power consumption. This paper presents the hardware implementation and experimental evaluation of a WCE device that uses IR-UWB signals in the frequency range of 3.5 GHz to 4.5 GHz to transmit image data from inside the body to a receiver placed outside the body. Key components of the IR-UWB transmitter, such as the narrow pulse generator and up-conversion based RF section are described in detail. This design employs a narrowband receiver in the WCE device to receive a control signal externally in order to control and improve the data transmission from the device in the body. The design and performance of a wideband implantable antenna that operates in the aforementioned frequency range is also described. The operation of the WCE device is demonstrated through a proof-of-concept experiment using meat. PMID:25571601

Thotahewa, Kasun M S; Redoute, Jean-Michel; Yuce, Mehmet Rasit

2014-01-01

164

An analysis of through- wall radar based on UWB impulse technique  

Microsoft Academic Search

Application of through-wall radar requires the ability to detect targets through relatively high-density materials such as concrete, stone and brick. Ultra wideband (UWB) impulse technique is able to penetrate these materials. The capacity to make wall relatively transparent is due to the broad-band nature of the transmitted impulses. First of all, ultra wideband radar system block diagram is depicted. Secondly,

Jiabing Zhu; Yi Hong

2010-01-01

165

Ultra-Wideband Sensors for Improved Magnetic Resonance Imaging, Cardiovascular Monitoring and Tumour Diagnostics  

PubMed Central

The specific advantages of ultra-wideband electromagnetic remote sensing (UWB radar) make it a particularly attractive technique for biomedical applications. We partially review our activities in utilizing this novel approach for the benefit of high and ultra-high field magnetic resonance imaging (MRI) and other applications, e.g., for intensive care medicine and biomedical research. We could show that our approach is beneficial for applications like motion tracking for high resolution brain imaging due to the non-contact acquisition of involuntary head motions with high spatial resolution, navigation for cardiac MRI due to our interpretation of the detected physiological mechanical contraction of the heart muscle and for MR safety, since we have investigated the influence of high static magnetic fields on myocardial mechanics. From our findings we could conclude, that UWB radar can serve as a navigator technique for high and ultra-high field magnetic resonance imaging and can be beneficial preserving the high resolution capability of this imaging modality. Furthermore it can potentially be used to support standard ECG analysis by complementary information where sole ECG analysis fails. Further analytical investigations have proven the feasibility of this method for intracranial displacements detection and the rendition of a tumour抯 contrast agent based perfusion dynamic. Beside these analytical approaches we have carried out FDTD simulations of a complex arrangement mimicking the illumination of a human torso model incorporating the geometry of the antennas applied. PMID:22163498

Thiel, Florian; Kosch, Olaf; Seifert, Frank

2010-01-01

166

Design of an UWB antenna and impact of the resulting pulse shape on the communication  

E-print Network

1 Design of an UWB antenna and impact of the resulting pulse shape on the communication capacity the impact of the antenna design over the capacity of a IR-UWB system in a Multi-User Interference environment. A new antenna design is proposed and it is showed using a new performance criterion

Paris-Sud XI, Universit de

167

Ultra-wideband Radar Data Models and Target Detection with Adaptive Rank-Order Filters  

Microsoft Academic Search

ABSTRACT A number,of aspects of ultra-wideband radar target detection analysis and algorithm development,are addressed. The first portion of the paper describes a bi-modal technique for modeling ultra-wideband radar clutter. This technique was developed based on an analysis of ultra-wideband radar phenomenology.,Synthetic image,samples,that were generated by this modeling,process are presented. This sample set is characterized by a number,of physical parameters. The

Patterson Afb; Atindra K. Mitra; Thomas L. Lewis; Anindya S. Paul; Arnab K. Shaw

168

Design and Simulation of Ultra-wideband Quad-Ridged Horn Antenna  

Microsoft Academic Search

An ultra-wideband quad-ridged horn antenna in ultra-wideband communication system is described in which offer unique advantages its own structure characters. By simulation and optimization, the 2-18 GHz quad-ridged horn antenna can realize high gain and dual polarization operations, and the operating bandwidth is enough for practical operation. The simulation results and analyses of the ultra-wideband quad-ridged horn antenna are presented.

Jinghui Qiu; Ying Suo; Wei Li

2007-01-01

169

A novel DHT-based ultra-wideband system  

Microsoft Academic Search

In this paper, a low complexity orthogonal frequency division multiplexing (OFDM) system is proposed for use in high-speed ultra-wideband physical links. Discrete Hartley transform (DHT) and its inverse are employed to perform modulation\\/demodulation. A data-aided channel estimation algorithm is derived. Both the computational complexity and hardware cost of this system are much lower than that of conventional DFT-based OFDM. The

Deqiang Wang; Danpu Liu; Fang Liu; Guangxin Yue

2005-01-01

170

Performance Evaluation of a UWB-RFID System for Potential Space Applications  

NASA Technical Reports Server (NTRS)

This talk presents a brief overview of the ultra-wideband (UWB) RFID system with emphasis on the performance evaluation of a commercially available UWB-RFID system. There are many RFID systems available today, but many provide just basic identification for auditing and inventory tracking. For applications that require high precision real time tracking, UWB technology has been shown to be a viable solution. The use of extremely short bursts of RF pulses offers high immunity to interference from other RF systems, precise tracking due to sub-nanosecond time resolution, and robust performance in multipath environments. The UWB-RFID system Sapphire DART (Digital Active RFID & Tracking) will be introduced in this talk. Laboratory testing using Sapphire DART is performed to evaluate its capability such as coverage area, accuracy, ease of operation, and robustness. Performance evaluation of this system in an operational environment (a receiving warehouse) for inventory tracking is also conducted. Concepts of using the UWB-RFID technology to track astronauts and assets are being proposed for space exploration.

Phan, Chan T.; Arndt, D.; Ngo, P.; Gross, J.; Ni, Jianjun; Rafford, Melinda

2006-01-01

171

Localization and Tracking for LDR-UWB Systems  

Microsoft Academic Search

Localization and tracking (LT) algorithms for low data rate (LDR) ultra wideband (UWB) systems developed within the Integrated Project PULSERS Phase II are reviewed and compared. In particular, two localization algorithms, designed for static networks with mesh topologies, and one Tracking Algorithm, designed for dynamic network with star topologies are described and\\/or compared. Each of the localization algorithms adopts a

Giuseppe Destino; Davide Macagnano; Giuseppe Abreu; B. Denis; L. Ouvry

2007-01-01

172

A new FSS design proposal for UWB applications  

Microsoft Academic Search

This work presents a new proposal for Frequency Selective Surface (FSS) design for Ultra-Wideband (UWB) applications. The new FSSs consist of an array composed by the association of two patch elements per cell: a square loop and a crossed dipole. These structures are called Crossed Loops and have the objective of increasing the bandwidth of the square loop and the

R. M. S. Cruz; A. G. D'Assunao; P. H. da F Silva

2010-01-01

173

An accurate and robust algorithm for detection of heart and respiration rates using an impulse based UWB signal  

Microsoft Academic Search

The purpose of this paper is to introduce an accurate algorithm to detect respiration rate and heart beat using an Ultra-Wideband (UWB) signal. One important issue to consider for obtaining precise results is the right selection of measurement parameters in UWB system. In this work the impact of these parameters in detecting respiration rate and heart beat are studied and

Mehran Baboli; Azadeh Sharafi; Alireza Ahmadian; M. S. Nambakhsh

2009-01-01

174

Design Of Ultra Wideband Coplanar Waveguide Fed Rectangular Slot Antenna With Tuning Stub  

E-print Network

Design Of Ultra Wideband Coplanar Waveguide Fed Rectangular Slot Antenna With Tuning Stub antenna tuned by a patch stub is designed and presented for ultra wideband band applications simulation and analysis for this class of antennas are performed using the Momentum software package

Elsherbeni, Atef Z.

175

Ultra-wideband microwave photonic phase shifter with a 360 tunable phase shift based  

E-print Network

Ultra-wideband microwave photonic phase shifter with a 360掳 tunable phase shift based on an erbium-ytterbium photonic approach to implementing an ultra-wideband microwave phase shifter based on an erbium颅 ytterbium-light effects in a semiconductor optical amplifier (SOA) [9] or in a tilted fiber Bragg gra- ting [10

Yao, Jianping

176

Design of Compact Logarithmically Periodic Antenna Structures for Polarization-Invariant UWB Communication  

Microsoft Academic Search

Ultra Wideband (UWB) communication systems seem promising in order to establish a new standard for short-range data transmission with enhanced data rates in a frequency range from 3.1-10.6 GHz. The antenna design for UWB signal radiation is one of the main challenges, especially when low-cost geometri- cally small and efficients structures are required, serving as air-interfaces to the UWB transmission

Oliver Klempa; Hermann Eul

177

Amplify-and-Forward Cooperative Diversity for Green UWB-Based WBSNs  

PubMed Central

This paper proposes a novel green cooperative diversity technique based on suboptimal template-based ultra-wideband (UWB) wireless body sensor networks (WBSNs) using amplify-and-forward (AF) relays. In addition, it analyzes the bit-error-rate (BER) performance of the proposed nodes. The analysis is based on the moment-generating function (MGF) of the total signal-to-noise ratio (SNR) at the destination. It also provides an approximate value for the total SNR. The analysis studies the performance of equally correlated binary pulse position modulation (EC-BPPM) assuming the sinusoidal and square suboptimal template pulses. Numerical results are provided for the performance evaluation of optimal and suboptimal template-based nodes with and without relay cooperation. Results show that one relay node provides ~23?dB performance enhancement at 1e ? 3 BER, which mitigates the effect of the nondesirable non-line-of-sight (NLOS) links in WBSNs. PMID:24307880

2013-01-01

178

Design and Performance Evaluation on Ultra-Wideband Time-Of-Arrival 3D Tracking System  

NASA Technical Reports Server (NTRS)

A three-dimensional (3D) Ultra-Wideband (UWB) Time--of-Arrival (TOA) tracking system has been studied at NASA Johnson Space Center (JSC) to provide the tracking capability inside the International Space Station (ISS) modules for various applications. One of applications is to locate and report the location where crew experienced possible high level of carbon-dioxide and felt upset. In order to accurately locate those places in a multipath intensive environment like ISS modules, it requires a robust real-time location system (RTLS) which can provide the required accuracy and update rate. A 3D UWB TOA tracking system with two-way ranging has been proposed and studied. The designed system will be tested in the Wireless Habitat Testbed which simulates the ISS module environment. In this presentation, we discuss the 3D TOA tracking algorithm and the performance evaluation based on different tracking baseline configurations. The simulation results show that two configurations of the tracking baseline are feasible. With 100 picoseconds standard deviation (STD) of TOA estimates, the average tracking error 0.2392 feet (about 7 centimeters) can be achieved for configuration Twisted Rectangle while the average tracking error 0.9183 feet (about 28 centimeters) can be achieved for configuration Slightly-Twisted Top Rectangle . The tracking accuracy can be further improved with the improvement of the STD of TOA estimates. With 10 picoseconds STD of TOA estimates, the average tracking error 0.0239 feet (less than 1 centimeter) can be achieved for configuration "Twisted Rectangle".

Ni, Jianjun; Arndt, Dickey; Ngo, Phong; Dusl, John

2012-01-01

179

All-optical binary phase-coded UWB signal generation using DWDM-based multi-channel frequency discriminator  

NASA Astrophysics Data System (ADS)

A simple all-optical binary phase-coded ultra-wideband (UWB) signal generation scheme only using a DWDM-based multi-channel optical frequency discriminator is proposed and demonstrated. In the proposed scheme, the CW lights emitted from a laser array are modulated in a phase modulator driven by electrical Gaussian pulses, and then are sent to a DWDM used as a multi-channel optical frequency discriminator, in which phase modulation to intensity modulation (PM-IM) conversions are performed, and by locating the phase-modulated light wavelengths at the positive or negative slopes of the DWDM transmission spectra, delaying and recombining each channel signal, binary phase-coded UWB codes are generated. We numerically demonstrate encode and decode process of binary phase-coded UWB signals with a code length of 4, operating at 625 Mbit/s. In addition, binary phase-coded UWB signal transmission in fiber link was also numerically investigated. Our proposed system has potential application in future multi-user UWB-over-fiber communication systems.

Tan, Long-Sheng; Wang, Fei; Ma, Huan; Hu, Qiang; Zhao, Xiao-Fang

2014-02-01

180

QUAD RIDGED HORN ANTENNA FOR UWB APPLICATIONS  

Microsoft Academic Search

Abstract桾his paper describes a novel design of a dual-polarized ultra wideband horn antenna. Based on a VSWR ? 2.6, the bandwidth of the designed UWB horn antenna is from 818 GHz, most suitable for radar systems. A newcoaxial line to quadruple-ridged waveguide transition and a newtechnique for tapering the flared section of the horn is introduced to improve the return

Ramin Dehdasht-Heydari; Hamid Reza Hassani; Ali Reza Mallahzadeh

2008-01-01

181

Performance analysis of an over-sampling multi-channel equalization for a multi-band uwb system  

Microsoft Academic Search

This paper proposes an over-sampling multi-channel equalizer per sub-band for multi-band ultra-wideband (UWB) system and compares its performance with conventional RAKE receiver when operating in practical UWB channel models. Three transmission modes have been considered, and inter-symbol interference (ISI) is found to be inherent to certain transmission modes due to the large UWB channel delay spreads. Through detailed analytical and

Sai Ho Wong; Xiaoming Peng; Francois P. S. Chin; A. S. Madhukumar

2006-01-01

182

Three-Dimensional Planetary Surface Tracking Based on a Simple Ultra-Wideband Impulse-Radio Infrastructure  

NASA Technical Reports Server (NTRS)

Several prototype ultra-wideband (UWB) impulse-radio (IR) tracking systems are currently under development at NASA Johnson Space Center (JSC). These systems are being studied for use in tracking of Lunar/Mars rovers and astronauts during early exploration missions when satellite navigation systems (such as GPS) are not available. To date, the systems that have been designed and tested are intended only for two-dimensional location and tracking, but these designs can all be extended to three-dimensional tracking with only minor modifications and increases in complexity. In this presentation, we will briefly review the design and performance of two of the current 2-D systems: one designed specifically for short-range, extremely high-precision tracking (approximately 1-2 cm resolution) and the other designed specifically for much longer range tracking with less stringent precision requirements (1-2 m resolution). We will then discuss a new multi-purpose system design based on a simple UWB-IR architecture that can be deployed easily on a planetary surface to support arbitrary three-dimensional localization and tracking applications. We will discuss utilization of this system as an infrastructure to provide both short-range and long-range tracking and analyze the localization performance of the system in several different configurations. We will give theoretical performance bounds for some canonical system configurations and compare these performance bounds with both numerical simulations of the system as well as actual experimental system performance evaluations.

Barton, Richard J.; Ni, David; Ngo, Phong

2010-01-01

183

Ultra-wideband Location Authentication for Item Tracking  

SciTech Connect

International safeguards is increasingly utilizing unattended and remote monitoring methods to improve inspector efficiency and the timeliness of diversion detection. Item identification and tracking has been proposed as one unattended remote monitoring method, and a number of radio-frequency (RF) technologies have been proposed. When utilizing location information for verification purposes, strong assurance of the authenticity of the reported location is required, but most commercial RF systems are vulnerable to a variety of spoofing and relay attacks. ORNL has developed a distance bounding method that uses ultra-wideband technology to provide strong assurance of item location. This distance bounding approach can be coupled with strong symmetric key authentication methods to provide a fully authenticable tracking system that is resistant to both spoofing and relay attacks. This paper will discuss the overall problems associated with RF tracking including the common spoofing and relay attack scenarios, the ORNL distance bounding approach for authenticating location, and the potential applications for this technology.

Rowe, Nathan C [ORNL; Kuhn, Michael J [ORNL; Stinson, Brad J [ORNL; Holland, Stephen A [ORNL

2012-01-01

184

Ultra-wideband Radar Methods and Techniques of Medical Sensing and Imaging  

SciTech Connect

Ultra-wideband radar holds great promise for a variety of medical applications. We have demonstrated the feasibility of using ultra-wideband sensors for detection of internal injuries, monitoring of respiratory and cardiac functions, and continuous non-contact imaging of the human body. Sensors are low-power, portable, and do not require physical contact with the patient. They are ideal for use by emergency responders to make rapid diagnosis and triage decisions. In the hospital, vital signs monitoring and imaging application could improve patient outcomes. In this paper we present an overview of ultra-wideband radar technology, discuss key design tradeoffs, and give examples of ongoing research in applying ultra-wideband technology to the medical field.

Paulson, C N; Chang, J T; Romero, C E; Watson, J; Pearce, F J; Levin, N

2005-10-07

185

DESIGN OF A BAND-NOTCHED MICROSTRIP CIRCU- LAR SLOT ANTENNA FOR UWB COMMUNICATION  

Microsoft Academic Search

In this paper, a novel band-notched circular slot (BNCS) antenna for ultra-wideband (UWB) communication is proposed. This antenna is comprised of a circular stub that excite similar-shaped slot aperture. The proposed antenna is designed on the RO4350B substrate with thickness of 500\\

A.-A. Kalteh; R. Fallahi; M. G. Roozbahani

2010-01-01

186

A SOFTWARE DEFINED RADIO RECEIVER ARCHITECTURE FOR UWB COMMUNICATIONS AND POSITIONING  

E-print Network

A SOFTWARE DEFINED RADIO RECEIVER ARCHITECTURE FOR UWB COMMUNICATIONS AND POSITIONING Yanyang Zhao.zhao@polymtl.ca, J-F.frigon@polymtl.ca, ke.wu@polymtl.ca, Renato.bosisio@polymtl.ca Abstract A software defined radio operating band. Keywords: Software defined radio, Ultra-wideband, six-port, demodulation, positioning 1

Frigon, Jean-Fran鏾is

187

Low Complexity Low Data Rate UWB Devices - Architecture and Performance Comparison  

Microsoft Academic Search

In this work the performance of low data rate Ultra-Wideband (UWB) devices is studied. The most important design constraint is low complexity and low power consumption. Four different architectures of different complexity are built in a modular approach from functional blocks. The trade-offs of these architectures between performance and complexity are shown. I. I NTRODUCTION In the last years Ultra

Michael Schmidt; Djordje Simic; Rainer Moorfeld

188

Cramer-Rao Lower Bounds for the Synchronization of UWB Signals  

E-print Network

1 Cram麓er-Rao Lower Bounds for the Synchronization of UWB Signals J. Zhang, R. A. Kennedy, T. D. Abhayapala Abstract-- In this paper, we present Cram麓er-Rao lower bounds (CRLBs) for the synchronization is quantified. Index Terms-- Ultra Wideband, Synchronization, Cram麓er-Rao lower bounds I. INTRODUCTION Ultra

Abhayapala, Thushara D.

189

Ultra wideband indoor channel modeling for personal area networking  

Microsoft Academic Search

This paper investigates the Line of Sight (LOS) path loss characteristics of the UWB channel by explicitly focusing on a very short range of 15 m. A vector network analyzer was used to measure the channel transfer function in the frequency band of 68 GHz. It has been observed that the published path loss models for UWB communications report a

Ranjan Bose

2006-01-01

190

Ultra-wideband radar target modeling using triangular patch model  

Microsoft Academic Search

To understand the UWB radar system, target scattering performance must be studied. As a widely used model in time domain electromagnetics triangular patch model (TPM) is employed to simulate UWB radar targets. But when the scattered fields are treated, singular points would occur of TPM. The singularity analysis is carried out of TPM and a method is proposed to deal

Shi-Wei Dong; Wei Ma; Hong-Tai Zhang; Le-De Qiu

2008-01-01

191

Low-profile, Ultra-wideband, Cavity-backed Spiral Antennas  

NASA Astrophysics Data System (ADS)

Spiral antennas are a popular class of antennas that demonstrate exceptionally large bandwidths, uniform input impedance, stable gains and the ability to radiate circularly polarized waves over their entire frequency coverage. Circularly polarized radiators are integral components of all space-based communication, SATNAV and SATCOM services, microwave direction finding systems, GPS applications, in-flight connectivity etc. As a result, spiral and helical elements have become a distinctive branch in the field of antenna engineering. Spiral antennas are often configured with a metallic cavity that restricts the radiation to one hemisphere for unidirectional operation. With ever-decreasing dimensions of communication devices and to focus on issues concerning space constraints arising from installation of numerous antenna elements, low-profile geometries have drawn considerable research interest over the years. In this dissertation, we have addressed the problem of designing low-profile, ultra-wideband (UWB), 2-18 GHz cavity-backed spiral antennas. First, we discuss the development of UWB shallow, absorptive cavities from a microwave material characterization standpoint. We then proceed onto geometrically modifying regular spirals to obtain more compact structures that incorporate certain radiation properties. Axial ratio is one the most important bandwidth factors in measuring the performance of a circularly polarized radiator. In developing low-profile geometries, one most often encounters the problem of deterioration of the axial ratio. This is particularly evident in rectangular spiral antennas, where the purity of the circularly polarized waves is highly compromised as a tradeoff with available aperture. It therefore becomes essential to design spiral geometry in such a way so as to preserve the lowest possible antenna aperture with the best possible axial ratio performance. In our work, we have presented a detailed study of slow wave spirals, elliptical spirals and modified Archimedean polygonal spiral antenna designs that address the problem of maintaining high axial ratio performance with low-profile planar geometries. The designed antenna systems have been fabricated and tested for performance validation, and they demonstrate excellent axial ratio characteristics across their bandwidth.

Rahman, Nahid

192

The propagation and scattering characteristics of a forest as measured by coherent ultra-wideband foliage penetration  

NASA Astrophysics Data System (ADS)

Coherent polarimetric synthetic aperture radar (SAR) measurements of a central Ohio forest have been collected, and it is the objective of this research to document and analyze the results. The foliage data presented in this dissertation are unique in several aspects. Primarily, the data are Ultra-Wideband (UWB) in that the bandwidth (200-1600MHz) divided by center frequency is at least 25% and are of a wavelength selected to penetrate the forest canopy. Data of this bandwidth or resolution offer the opportunity to see for the first time at these frequencies scattering components such as branches, tree trunks, and ground-tree interaction terms. Secondly, coherent apertures were collected by precisely moving the antennas within a well-known coordinate system leading to absolute phase calibration and to the generation of fully coherent SAR imagery. Much of the past work performed on foliage propagation and scattering does not include phase information which is crucial for predicting the performance of radars of this type. The underlying goals of this research are to identify the fundamental scattering mechanisms associated with the forest backscatter at these frequencies and to assess UWB usage for the concealed target detection and identification problems. To this end, methods are developed to analyze the above measurements and extract modeling parameters such as the propagation loss, phase defect, and backscatter per unit area (sigmasp{o}). The analysis of these data provide the insight needed to statistically model the forest in both forward scatter and backscatter and to determine the ability of these UWB frequencies to penetrate the forest canopy.

Gwynne, John Scott

193

Planar half-disk antenna structures for ultra-wideband communications  

Microsoft Academic Search

Printed antennas are cheap, lightweight, easy to-fabricate with high precision, and adaptable to mass production. These features are desirable for both indoor and outdoor handheld UWB antenna applications. In this paper, we consider planar versions of the half-disk antenna with different feed structures. These versions are compared with respect to radiated pulse width (to get higher data throughput), pulse amplitude

Taeyoung Yang; William A. Davis

2004-01-01

194

Radiated Emission of Breath Monitoring System Based on UWB Pulses in Spacecraft Modules  

NASA Astrophysics Data System (ADS)

The paper describes some EMC aspects related to a UWB radar for monitoring astronauts breathing activity. Compliance to EMC space standards forces some design aspects, in particular the peak voltage and the pulse waveform. Moreover some simulations were carried out to consider realistic operating condition. In the first case the interference towards a victim wifi circuit was analyzed, in the second case the effect of the environment on the radiated pulse was studied.

Russo, P.; Mariani Primiani, V.; De Leo, A.; Cerri, G.

2012-05-01

195

A time domain spherical near-field measurement facility for UWB antennas employing a hardware gating technique  

NASA Astrophysics Data System (ADS)

A spherical near-field antenna measurement facility employing a time domain hardware gating technique is presented. On-off keyed sinusoidal impulses are used as stimuli requiring wideband antennas with a bandwidth in excess of 400 MHz. The received signal is evaluated in the time interval after reaching the steady state and before multipath components arising in the non-ideal anechoic chamber distort the signal. An application specific pulse generator synthesizing sinusoidal impulses with a sub-nanosecond settling time and a low-cost equivalent time (ET) sampling receiver developed and optimized for this particular purpose are described. Measurement results of typical ultra-wideband (UWB) antennas show a significant improvement of the measured antenna pattern compared to conventional techniques.

Blech, M. D.; Leibfritz, M. M.; Hellinger, R.; Geier, D.; Maier, F. A.; Pietsch, A. M.; Eibert, T. F.

2010-10-01

196

A Comparative Study of Wireless Protocols: Bluetooth, UWB, ZigBee, and Wi-Fi  

Microsoft Academic Search

Bluetooth (over IEEE 802.15.1), ultra-wideband (UWB, over IEEE 802.15.3), ZigBee (over IEEE 802.15.4), and Wi-Fi (over IEEE 802.11) are four protocol standards for short- range wireless communications with low power consumption. From an application point of view, bluetooth is intended for a cordless mouse, keyboard, and hands-free headset, UWB is oriented to high-bandwidth multimedia links, ZigBee is designed for reliable

Jin-Shyan Lee; Yu-Wei Su; Chung-Chou Shen

2007-01-01

197

5GHz band-notched UWB elliptical slot antenna fed by microstrip line  

Microsoft Academic Search

In this paper a novel band-notched elliptical slot antenna for ultra-wideband (UWB) communication is proposed which is comprised of elliptical stub that excite similar-shaped slot aperture. The proposed antenna is designed on a substrate RT\\/duroid 6006 with thickness of 1.27 mm and relative permittivity (?r) of 6.0 to operate in UWB band released by FCC in 2002 (i.e., 3.1-10.6 GHz).

A. A. Kalteh; R. Fallahi; M. Golparvar Roozbahani

2010-01-01

198

UWB Tracking Software Development  

NASA Technical Reports Server (NTRS)

An Ultra-Wideband (UWB) two-cluster Angle of Arrival (AOA) tracking prototype system is currently being developed and tested at NASA Johnson Space Center for space exploration applications. This talk discusses the software development efforts for this UWB two-cluster AOA tracking system. The role the software plays in this system is to take waveform data from two UWB radio receivers as an input, feed this input into an AOA tracking algorithm, and generate the target position as an output. The architecture of the software (Input/Output Interface and Algorithm Core) will be introduced in this talk. The development of this software has three phases. In Phase I, the software is mostly Matlab driven and calls C++ socket functions to provide the communication links to the radios. This is beneficial in the early stage when it is necessary to frequently test changes in the algorithm. Phase II of the development is to have the software mostly C++ driven and call a Matlab function for the AOA tracking algorithm. This is beneficial in order to send the tracking results to other systems and also to improve the tracking update rate of the system. The third phase is part of future work and is to have the software completely C++ driven with a graphics user interface. This software design enables the fine resolution tracking of the UWB two-cluster AOA tracking system.

Gross, Julia; Arndt, Dickey; Ngo, Phong; Phan, Chau; Dusl, John; Ni, Jianjun; Rafford, Melinda

2006-01-01

199

75 FR 62476 - Ultra-Wideband Transmission Systems  

Federal Register 2010, 2011, 2012, 2013, 2014

...Systems proceeding and thus provides certainty for the continued development of UWB equipment, including ground penetrating radars for underground imaging, through wall imaging systems, short- range high capacity data links, and other applications....

2010-10-12

200

High-order UWB pulses scheme to generate multilevel modulation formats based on incoherent optical sources.  

PubMed

We present a high-order UWB pulses generator based on a microwave photonic filter which provides a set of positive and negative samples by using the slicing of an incoherent optical source and the phase inversion in a Mach-Zehnder modulator. The simple scalability and high reconfigurability of the system permit a better accomplishment of the FCC requirements. Moreover, the proposed scheme permits an easy adaptation to pulse amplitude modulation, bi phase modulation, pulse shape modulation and pulse position modulation. The flexibility of the scheme for being adaptable to multilevel modulation formats permits to increase the transmission bit rate by using hybrid modulation formats. PMID:24514405

Bolea, Mario; Mora, Jos; Ortega, Beatriz; Capmany, Jos

2013-11-18

201

Ultra-wideband VHF SAR -- Design and measurements  

SciTech Connect

CARABAS, an acronym for ``Coherent All Radio Band Sensing``, is an airborne, horizontal-polarization SAR operating across the frequency band 20--90 MHz, conceived, designed and built by FOA in Sweden. The original motivation for designing such a low frequency system was that a large relative or fractional bandwidth could be achieved at low frequencies. For reasons to be explained, a large fractional bandwidth was considered to be of potential benefit for radar detection in severe clutter environments. A feasibility study of a short wave ultra-wideband radar started at FOA in 1985. Actual construction of the CARABAS system commenced 1987, aircraft integration took place during 1991 and the first radar tests were conducted in early 1992. From the fall of 1992 onwards, field campaigns and evaluation studies have been conducted as a joint effort between FOA and MIT Lincoln Laboratory in the US. This article will focus on experiences concerning foliage penetration with the system. First the authors touch upon the CARABAS system characteristics, outline the arguments behind a large-fractional-bandwidth VHF-band SAR approach to foliage penetration, and finally present some early experimental results. The authors refer to other papers, for a fuller explanation of the system, for more details of image calibration and for results concerning underground imaging.

Hellsten, H.; Froelind, P.O.; Gustavsson, A.; Jonsson, T.; Larsson, B.; Stenstroem, G. [National Defense Research Establishment, Linkoeping (Sweden); Binder, B.T.; Mirkin, M.; Ayasli, S. [Massachusetts Inst. of Technology, Lexington, MA (United States)

1994-12-31

202

Group Delay in THz Spectroscopy with Ultra-Wideband Log-Spiral Antennae  

NASA Astrophysics Data System (ADS)

We report on the group delay observed in continuous-wave terahertz spectroscopy based on photomixing with phase-sensitive homodyne detection. We discuss the different contributions of the experimental setup to the phase difference ? ?( ?) between transmitter arm and receiver arm. A simple model based on three contributions yields a quantitative description of the overall behavior of ? ?( ?). Firstly, the optical path-length difference gives rise to a term linear in frequency ?. Secondly, the ultra-wideband log-spiral antennae effectively radiate and receive in a frequency-dependent active region, which in the most simple model is an annular area with a circumference equal to the wavelength. The corresponding term changes by roughly 6 ? between 100 GHz and 1 THz. The third contribution stems from the photomixer impedance. In contrast, the derivative ?? ?/ ? ? is dominated by the contribution of periodic modulations of ? ?( ?) caused by standing waves, e.g., in the photomixers' Si lenses. Furthermore, we discuss the Fourier-transformed spectra, which are equivalent to the waveform in a time-domain experiment. In the time domain, the group delay introduced by the log-spiral antennae gives rise to strongly chirped signals, in which low frequencies are delayed. Correcting for the contributions of antennae and photomixers yields sharp peaks or "pulses" and thus facilitates a time-domain-like analysis of our continuous-wave data.

Langenbach, M.; Roggenbuck, A.; C醡ara Mayorga, I.; Deninger, A.; Thirunavukkuarasu, K.; Hemberger, J.; Gr黱inger, M.

2014-11-01

203

Interference Analysis and Sensing Threshold of Detect and Avoid (DAA) for UWB Coexistence with WiMax  

Microsoft Academic Search

Although ultra wideband (UWB) is a promising wireless technology for the future due to its high data rate, low power consumption, and low cost, its worldwide acceptance is conditioned by coexistence issues because of the frequency overlap with other wireless standards such as WiMax. In many countries, a detect and avoid (DAA) scheme has been promoted as a means to

Kwan-woo Kim; Jongmin Park; Jinyoun Cho; Kyutae Lim; Charles J. Razzell; Kihong Kim; Chang-ho Lee; Haksun Kim; Joy Laskar

2007-01-01

204

Monopole-like slot UWB antenna on LTCC  

Microsoft Academic Search

A compact monopole-like slot antenna is presented for ultra-wideband (UWB) applications. The proposed antenna is printed onto a piece of low temperature co-fired ceramic (LTCC) and fed by a microstrip fork-shaped feeding structure. The characteristics of the proposed antenna are investigated numerically and validated experimentally. The prototype with overall size of 25 mm times 25 mm times 0.58 mm achieves

Xianming Qing; Zhi Ning Chen

2008-01-01

205

Studies of Scattering, Reflectivity, and Transmitivity in WBAN Channel: Feasibility of Using UWB  

PubMed Central

The Wireless Personal Area Network (WPAN) is one of the fledging paradigms that the next generation of wireless systems is sprouting towards. Among them, a more specific category is the Wireless Body Area Network (WBAN) used for health monitoring. On the other hand, Ultra-Wideband (UWB) comes with a number of desirable features at the physical layer for wireless communications. One big challenge in adoption of UWB in WBAN is the fact that signals get attenuated exponentially. Due to the intrinsic structural complexity in human body, electromagnetic waves show a profound variation during propagation through it. The reflection and transmission coefficients of human body are highly dependent upon the dielectric constants as well as upon the frequency. The difference in structural materials such as fat, muscles and blood essentially makes electromagnetic wave attenuation to be different along the way. Thus, a complete characterization of body channel is a challenging task. The connection between attenuation and frequency of the signal makes the investigation of UWB in WBAN an interesting proposition. In this paper, we study analytically the impact of body channels on electromagnetic signal propagation with reference to UWB. In the process, scattering, reflectivity and transmitivity have been addressed with analysis of approximate layer-wise modeling, and with numerical depictions. Pulses with Gaussian profile have been employed in our analysis. It shows that, under reasonable practical approximations, the human body channel can be modeled in layers so as to have the effects of total reflections or total transmissions in certain frequency bands. This could help decide such design issues as antenna characteristics of implant devices for WBAN employing UWB. PMID:22219673

Kabir, Md. Humaun; Ashrafuzzaman, Kazi; Chowdhury, M. Sanaullah; Kwak, Kyung Sup

2010-01-01

206

Studies of scattering, reflectivity, and transmitivity in WBAN channel: feasibility of using UWB.  

PubMed

The Wireless Personal Area Network (WPAN) is one of the fledging paradigms that the next generation of wireless systems is sprouting towards. Among them, a more specific category is the Wireless Body Area Network (WBAN) used for health monitoring. On the other hand, Ultra-Wideband (UWB) comes with a number of desirable features at the physical layer for wireless communications. One big challenge in adoption of UWB in WBAN is the fact that signals get attenuated exponentially. Due to the intrinsic structural complexity in human body, electromagnetic waves show a profound variation during propagation through it. The reflection and transmission coefficients of human body are highly dependent upon the dielectric constants as well as upon the frequency. The difference in structural materials such as fat, muscles and blood essentially makes electromagnetic wave attenuation to be different along the way. Thus, a complete characterization of body channel is a challenging task. The connection between attenuation and frequency of the signal makes the investigation of UWB in WBAN an interesting proposition. In this paper, we study analytically the impact of body channels on electromagnetic signal propagation with reference to UWB. In the process, scattering, reflectivity and transmitivity have been addressed with analysis of approximate layer-wise modeling, and with numerical depictions. Pulses with Gaussian profile have been employed in our analysis. It shows that, under reasonable practical approximations, the human body channel can be modeled in layers so as to have the effects of total reflections or total transmissions in certain frequency bands. This could help decide such design issues as antenna characteristics of implant devices for WBAN employing UWB. PMID:22219673

Kabir, Md Humaun; Ashrafuzzaman, Kazi; Chowdhury, M Sanaullah; Kwak, Kyung Sup

2010-01-01

207

The GIMLI: A Compact High-Power UWB Radiation Source  

NASA Astrophysics Data System (ADS)

This chapter presents the design and performances of a compact, general-purpose, high-power ultra-wideband (UWB) source named GIMLI. The system was designed for dual use, homeland security and military applications. It is powered by a compact, coaxial 12-stage Marx generator with a rise time lower than 25 ns and an operating voltage up to 360 kV. A fast monocycle pulse is sharpened using a pulse former (MPF). The shaper stage comprises a switching module including a peaking and a grounding multi-channel spark gap under a N2 pressure of 6 MPa. The module is followed by a monopulse-to-monocycle converter based on a coaxial Blumlein pulse forming line. The bipolar signal measured at the output of the MPF has a duration shorter than 2 ns with a rise time of 250 ps. The peak-to-peak output voltage is 250 kV on a 50 ? resistive load. Repetitive operation of the MPF has been experienced with a 200 Hz Tesla transformer developed by the CEA (Commissariat l'Energie Atomique). Electromagnetic energy is focused by a dedicated antenna. The designed antenna is a TEM half-horn with two ridges which improve the low-frequency focusing. High-power radiation tests show that the field measured at a distance of 9 m from the TEM Horn-antenna is higher than 120 kV/m.

Delmote, P.; Martin, B.

208

Transient analysis of the human body with a mobile phone subject to intense UWB pulses  

Microsoft Academic Search

Self-consistent 3-D FDTD analysis of a bounded-wave EMP simulator with a human model in the presence of a complex electrical environment is performed. The designed EMP simulator could be directly applied to the optimization of EMP for a desired level of the field intensity and risetime in UWB pulsed applications. Using a fine mesh and an Itanium II 160 processor

Shahid Ahmed; David Linton

2007-01-01

209

Ultra-Wideband Optical Modulation Spectrometer (OMS) Development  

NASA Technical Reports Server (NTRS)

The optical modulation spectrometer (OMS) is a novel, highly efficient, low mass backend for heterodyne receiver systems. Current and future heterodyne receiver systems operating at frequencies up to a few THz require broadband spectrometer backends to achieve spectral resolutions of R approximately 10(exp 5) to 10(exp 6) to carry out many important astronomical investigations. Among these are observations of broad emission and absorption lines from extra-galactic objects at high redshifts, spectral line surveys, and observations of planetary atmospheres. Many of these lines are pressure or velocity broadened with either large half-widths or line wings extending over several GHz. Current backend systems can cover the needed bandwidth only by combining the output of several spectrometers, each with typically up to 1 GHz bandwidth, or by combining several frequency-shifted spectra taken with a single spectrometer. An ultra-wideband optical modulation spectrometer with 10 - 40 GHz bandwidth will enable broadband ob- servations without the limitations and disadvantages of hybrid spectrometers. Spectrometers like the OMS will be important for both ground-based observatories and future space missions like the Single Aperture Far-Infrared Telescope (SAFIR) which might carry IR/submm array heterodyne receiver systems requiring a spectrometer for each array pixel. Small size, low mass and small power consumption are extremely important for space missions. This report summarizes the specifications developed for the OMS and lists already identified commercial parts. The report starts with a review of the principle of operation, then describes the most important components and their specifications which were derived from theory, and finishes with a conclusion and outlook.

Gardner, Jonathan (Technical Monitor); Tolls, Volker

2004-01-01

210

Design and development of a small compact ultra wideband antenna  

NASA Astrophysics Data System (ADS)

In this paper the design of a novel and compact U slot UWB printed monopole microstrip antenna of size 19.2 28.8 mm2 has been presented for wireless applications. The planar, small and thin UWB antenna design consists of a U slot radiator fed by a single 50? microstrip line with truncated ground plane is excited by a coaxial SMA connector. The simulations are done using the Ansoft High Frequency Structure Simulator (HFSS) software tool. The simulated results of impedance bandwidth are well supported by measurement. The measured group delay and radiation pattern results are also presented and performance of the antenna is analyzed/discussed.

Qurratulain; Chattoraj, Neela

2013-04-01

211

Ultra-wideband polarization conversion metasurfaces based on multiple plasmon resonances  

NASA Astrophysics Data System (ADS)

We propose to realize ultra-wideband polarization conversion metasurfaces in microwave regime through multiple plasmon resonances. An ultra-wideband polarization conversion metasurface is designed using a double-head arrow structure and is further demonstrated both numerically and experimentally. Four plasmon resonances are generated by electric and magnetic resonances, which lead to bandwidth expansion of cross-polarization reflection. The simulated results show that the maximum conversion efficiency is nearly 100% at the four plasmon resonance frequencies and a 1:4 3 dB bandwidth can be achieved for both normally incident x- and y-polarized waves. Experimental results agree well with simulation ones.

Chen, Hongya; Wang, Jiafu; Ma, Hua; Qu, Shaobo; Xu, Zhuo; Zhang, Anxue; Yan, Mingbao; Li, Yongfeng

2014-04-01

212

Capacity Bounds for an Ultra-Wideband Channel Model  

Microsoft Academic Search

There is an ongoing effort by the IEEE 802.15.3a subcommittee to reach a UWB personal area network standard. We estimate the achievable rates for such networks using a channel model spec- ified by the same group. The analysis of this chan- nel model is of interest in light of recent information- theoretic work on multipath fading channels which show that

Erdal Ar鮧an

213

UWB Tracking System Design for Free-Flyers  

NASA Technical Reports Server (NTRS)

This paper discusses an ultra-wideband (UWB) tracking system design effort for Mini-AERCam (Autonomous Extra-vehicular Robotic Camera), a free-flying video camera system under development at NASA Johnson Space Center for aid in surveillance around the International Space Station (ISS). UWB technology is exploited to implement the tracking system due to its properties, such as high data rate, fine time resolution, and low power spectral density. A system design using commercially available UWB products is proposed. A tracking algorithm TDOA (Time Difference of Arrival) that operates cooperatively with the UWB system is developed in this research effort. Matlab simulations show that the tracking algorithm can achieve fine tracking resolution with low noise TDOA data. Lab experiments demonstrate the UWB tracking capability with fine resolution.

Ni, Jianjun; Arndt, Dickey; Phan, Chan; Ngo, Phong; Gross, Julia; Dusl, John

2004-01-01

214

Inkjet Printed Ultra Wideband Spiral Antenna Using Integrated Balun on Liquid Crystal Polymer (LCP)  

E-print Network

Inkjet Printed Ultra Wideband Spiral Antenna Using Integrated Balun on Liquid Crystal Polymer (LCP, integrated balun is inkjet printed on liquid crystal polymer (LCP) substrate and operates successfully from 1 and the spiral arms are inkjet printed on LCP. The fabricated antenna covers a wideband frequency range (1~8GHz

Tentzeris, Manos

215

Fingerprinting Localization based on Neural Networks and Ultra-wideband signals  

E-print Network

Fingerprinting Localization based on Neural Networks and Ultra-wideband signals Lei Yu, Mohamed Abstract--Fingerprinting techniques have been proved as an effective techniques for determining (RSS) are subject to big positioning errors. In this paper, a fingerprinting based localization

Paris-Sud XI, Universit茅 de

216

Towards contrast enhanced breast imaging using ultra-wideband microwave radar system  

Microsoft Academic Search

In this paper we present numerical results of contrast-enhanced breast imaging using ultra-wideband microwave radar system. Due to low contrast in electrical properties between dense breast tissues and malignant tissues, tumor detection using microwave might be extremely challenging. To overcome this problem, we propose here a radar imaging technique based on a localized contrast enhancement. Our results show that microwave

M. Klemm; J. Leendertz; D. Gibbins; I. J. Craddock; A. Preece; R. Benjamin

2010-01-01

217

A Compact Ultra-Wideband Antenna for Time-and Frequency-Domain Applications  

E-print Network

is large. 2. ANTENNA DESIGN The topology ofthe proposed antenna is shown in Fig. l(b). The antenna simulated using a FDTD based simulation software. The antennas were then fabricated and their responses wereA Compact Ultra-Wideband Antenna for Time- and Frequency- Domain Applications Nader Behdad

Sarabandi, Kamal

218

Design of Compact Dual-Polarized Printed-Circuit Antenna for Ultra-Wideband Applications  

E-print Network

Design of Compact Dual-Polarized Printed-Circuit Antenna for Ultra-Wideband Applications K. Rambabu.2 and a gain better than 2 dBi. The design is verified by commercially available software and measurements design strategies for the patch antenna with overlapping squares (Fig. 1) in order to present the design

Bornemann, Jens

219

Development of an Ultra-Wideband Radar System for Vehicle Detection at Railway Crossings  

E-print Network

Development of an Ultra-Wideband Radar System for Vehicle Detection at Railway Crossings Stephen P in a railway crossing. Once fully developed, the detection performance of the system is to be compared against the loop the impedance changes and this change is sensed. Most railways companies prefer not to use buried

Kansas, University of

220

NOVEL ULTRA-WIDEBAND DISCONE Jinu Kim and Seong-Ook Park  

E-print Network

antenna [2]. Such a discone antenna's feeding structure can be overcome by using a small ball-type skirt untruncated structure is the skeletal biconical an- tenna. The skeletal biconical antennas for EMCNOVEL ULTRA-WIDEBAND DISCONE ANTENNA Jinu Kim and Seong-Ook Park School of Engineering Information

Park, Seong-Ook

221

RF Front-end for Impulse UWB Communication Systems Y.Y. Zhao, J.F. Frigon, K.Wu and R.G. Bosisio  

E-print Network

, Phase modulation, Six-port, Ultra-wideband. I. INTRODUCTION UWB technology has attracted interest from Chemin de Polytechnique, Montreal, QC, Canada, H3T 1J4 Abstract -- In this paper, we propose a multi(six)-port scheme by using a six-port phase modulator and demodulator. Both the modulator and demodulator adopt

Frigon, Jean-Fran鏾is

222

Capacity bounds for an ultra-wideband channel model  

Microsoft Academic Search

There is an ongoing effort by the IEEE 802.15.3a subcommittee to reach a UWB personal area network standard. We estimate the achievable rates for such networks using a channel model specified by the same group. The analysis of this channel model is of interest in light of recent information-theoretic work on multipath fading channels which show that in order to

Erdal Arikan

2004-01-01

223

UWB micro-doppler radar for human gait analysis using joint range-time-frequency representation  

NASA Astrophysics Data System (ADS)

In this paper, we present a novel, standalone ultra wideband (UWB) micro-Doppler radar sensor that goes beyond simple range or micro-Doppler detection to combined range-time-Doppler frequency analysis. Moreover, it can monitor more than one human object in both line-of-sight (LOS) and through wall scenarios, thus have full human objects tracking capabilities. The unique radar design is based on narrow pulse transceiver, high speed data acquisition module, and wideband antenna array. For advanced radar post-data processing, joint range-time-frequency representation has been performed. Characteristics of human walking activity have been analyzed using the radar sensor by precisely tracking the radar object and acquiring range-time-Doppler information simultaneously. The UWB micro-Doppler radar prototype is capable of detecting Doppler frequency range from -180 Hz to +180 Hz, which allows a maximum target velocity of 9 m/s. The developed radar sensor can also be extended for many other applications, such as respiration and heartbeat detection of trapped survivors under building debris.

Wang, Yazhou; Fathy, Aly E.

2013-05-01

224

UWB Technology and Applications on Space Exploration  

NASA Technical Reports Server (NTRS)

Ultra-wideband (UWB), also known as impulse or carrier-free radio technology, is one promising new technology. In February 2002, the Federal Communications Commission (FCC) approved the deployment of this technology. It is increasingly recognized that UWB technology holds great potential to provide significant benefits in many terrestrial and space applications such as precise positioning/tracking and high data rate mobile wireless communications. This talk presents an introduction to UWB technology and some applications on space exploration. UWB is characterized by several uniquely attractive features, such as low impact on other RF systems due to its extremely low power spectral densities, immunity to interference from narrow band RF systems due to its ultra-wide bandwidth, multipath immunity to fading due to ample multipath diversity, capable of precise positioning due to fine time resolution, capable of high data rate multi-channel performance. The related FCC regulations, IEEE standardization efforts and industry activities also will be addressed in this talk. For space applications, some projects currently under development at NASA Johnson Space Center will be introduced. These include the UWB integrated communication and tracking system for Lunar/Mars rover and astronauts, UWB-RFID ISS inventory tracking, and UWB-TDOA close-in high resolution tracking for potential applications on robonaut.

Ngo, Phong; Phan, Chau; Gross, Julia; Dusl, John; Ni, Jianjun; Rafford, Melinda

2006-01-01

225

UWB multi-burst transmit driver for averaging receivers  

DOEpatents

A multi-burst transmitter for ultra-wideband (UWB) communication systems generates a sequence of precisely spaced RF bursts from a single trigger event. There are two oscillators in the transmitter circuit, a gated burst rate oscillator and a gated RF burst or RF power output oscillator. The burst rate oscillator produces a relatively low frequency, i.e., MHz, square wave output for a selected transmit cycle, and drives the RF burst oscillator, which produces RF bursts of much higher frequency, i.e., GHz, during the transmit cycle. The frequency of the burst rate oscillator sets the spacing of the RF burst packets. The first oscillator output passes through a bias driver to the second oscillator. The bias driver conditions, e.g., level shifts, the signal from the first oscillator for input into the second oscillator, and also controls the length of each RF burst. A trigger pulse actuates a timing circuit, formed of a flip-flop and associated reset time delay circuit, that controls the operation of the first oscillator, i.e., how long it oscillates (which defines the transmit cycle).

Dallum, Gregory E

2012-11-20

226

Short-Range Wireless Communications for Next-Generation Networks: UWB, 60 GHz Millimeter-Wave WPAN, And ZigBee  

Microsoft Academic Search

This article presents standardization, regulation, and development issues associated with short-range wireless technologies for next-generation personal area networks (PAN). Ultra-wideband (UWB) and 60 GHz millimeter-wave communication technologies promise unprecedented short-range broadband wireless communication and are the harbingers of multigigabit wireless networks. Despite the huge potential for PAN, standardization and global spectrum regulations challenge the success of UWB. On the other

Theordore Rappaport

2007-01-01

227

IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 21, NO. 17, SEPTEMBER 1, 2009 1253 Polarity-and Shape-Switchable UWB Pulse  

E-print Network

-Switchable UWB Pulse Generation Based on a Photonic Microwave Delay-Line Filter With a Negative Tap Coefficient as a two- or three-tap microwave delay-line filter with one negative coefficient realized by operating a two- or three-tap photonic microwave delay-line filter with tap coefficients of (1, 1) or (1, 2, 1) [4

Yao, Jianping

228

A tapped delay line model of ground reflection for UWB MS-MIMO body area networks  

Microsoft Academic Search

Body Area Networks connect low-power wireless bio-sensors, which are placed in close proximity of the human body. In order to reduce energy consumption, a promising solution is to use the ultra-wideband (UWB) technology in a multiple-sensor multiple-antenna (MS-MIMO) system. This paper deals with a new empirical space-time channel model of the ground reflection. I. INTRODUCTION Recent research and advances in

Stephane Van Roy; Claude Oestges; Jean-Michel Dricot; Francois Horlin; Philippe De Doncker

2011-01-01

229

Design and implementation of advanced algorithms for MIMO-UWB wireless communications  

Microsoft Academic Search

This paper describes the design and implementa- tion of low-complexity multiple-input multiple-output (MIMO) signal processing techniques suitable for ultra-wideband (UWB) wireless communications. It provides the general system concept, description of the measurement set-up and modular FPGA plat- form for test and verification of the proposed multiple antenna schemes under real air-interface environment. We validate the performance of selected spatial multiplexing

Emil Dimitrov; Claus Kupferschmidt; Thomas Kaiser; Juha Korpi; Risto Nordman; Antti Anttonen; Andrea Giorgetti; Marco Chiani

2011-01-01

230

CMOS Distributed Active Power Combiners and Splitters for Multi-Antenna UWB Beamforming Transceivers  

Microsoft Academic Search

This paper presents the design of the first CMOS distributed active power combiners and splitters with wideband variable delay and gain. These circuits are the key components for use in multi-antenna (MA) ultra-wideband (UWB) point-to-point beamforming communication systems with multiple transmit and receive antennas. Two broadband circuit topologies for each active power combiner and splitter are proposed, one of which

Aminghasem Safarian; Lei Zhou; Payam Heydari

2007-01-01

231

Design of a high-spectral-efficiency MIMO MB-OFDM UWB baseband transceiver  

Microsoft Academic Search

A multiple-input multiple-output (MIMO) baseband transceiver for multi-band orthogonal frequency-division multiplexing (MB-OFDM) ultra-wideband (UWB) communications is proposed in the paper. In the transceiver, a spatial multiplexing scheme with four transmit and four receive antennas is utilized to increase spectrum efficiency and achieve 1.92-Gbps data rate. Performance of both the MIMO and single-input single-output (SISO) schemes is investigated through simulations under

Jian-Chen Liao; Yuan-Wei Wu; Hsi-Pin Ma

2010-01-01

232

Achieving High Data Rate in Multiband-OFDM UWB Over Power-Line Communication System  

Microsoft Academic Search

Theoretical studies indicate that a transmission data rate of up to gigabits per second can be achieved over low-voltage (LV) indoor power-line cables. Achieving a very high data rate (up to 480 Mb\\/s) is expected by applying WiMedia multiband-orthogonal frequency-divison multiplexing (MB-OFDM) standard for wireless ultra-wideband (UWB) communication over the power-line channel. However, the viability of this concept needs to

Masood Ur Rehman; Shihua Wang; Yanchao Liu; Shuxian Chen; Xiaodong Chen; Clive G. Parini

2012-01-01

233

A UWB WBAN channel model based on a pseudo-dynamic measurement  

Microsoft Academic Search

In this paper, we expand the knowledge of the ultra-wideband (UWB) channel in the frequency range of 3.110燝Hz in close proximity\\u000a of a human body. The channels under dynamic conditions due to the effect of body motions are studied through the pseudo-dynamic\\u000a measurement method. Firstly, the first-order statistics of the channels, namely, amplitude distributions are investigated.\\u000a Secondly, the dynamic features

Attaphongse Taparugssanagorn; Bin Zhen; Raffaello Tesi; Matti H鋗鋖鋓nen; Jari H. Iinatti; Ryuji Kohno

2011-01-01

234

Low power, non invasive UWB systems for WBAN and biomedical applications  

Microsoft Academic Search

Ultra-wideband (UWB) technology has received great attention in recent short-range communication systems and been considered one of the potential candidates for upcoming IEEE 802.15.6 body area network (BAN) standard. High penetration capability and high precision ranging with a wide bandwidth of up to 7.5GHz (from 3.1GHz to 10.6GHz) make it easy to image the organs of human body for biomedical

Woogeun Rhee; Ni Xu; Bo Zhou; Zhihua Wang

2010-01-01

235

Fully integrated distributed power amplifier in CMOS technology, optimized for UWB transmitters  

Microsoft Academic Search

A power amplifier (PA) using the distributed amplifier technique for the ultra wideband (UWB) standard is presented. The amplifier is fabricated in a standard 0.13 ?m CMOS technology and comes with on-chip biasing circuitry and a non-distributed input stage. Measurement results are given for a chip-on-board module to take any influence of product assembly into account. It achieves a transmission

Christian Grewing; Kay Winterberg; Stefan van Waasen; Martin Friedrich; Giuseppe Li Puma; A. Wiesbauer; C. Sandner

2004-01-01

236

Ranging in a dense multipath environment using an UWB radio link  

Microsoft Academic Search

A time-of-arrival (ToA)-based ranging scheme using an ultra-wideband (UWB) radio link is proposed. This ranging scheme implements a search algorithm for the detection of a direct path signal in the presence of dense multipath, utilizing generalized maximum-likelihood (GML) estimation. Models for critical parameters in the algorithm are based on statistical analysis of propagation data and the algorithm is tested on

Joon-Yong Lee; Robert A. Scholtz

2002-01-01

237

Technical challenges in ultra-wideband radar development for target detection and terrain mapping  

Microsoft Academic Search

This paper describes two ultra-wideband synthetic radars (SAR) currently being developed. One, the Foliage Penetration Advanced Technology Demonstration, will be installed on an Army C-12 and eventually the Global Hawk Unmanned Aerial Vehicle. It is designed to detect stationary military vehicles, which are camouflaged or hidden in forests and tree-lines. It employs a VHF SAR for screening and a UHF

Mark E. Davis; Philip G. Tomlinson; R. Paul Maloney

1999-01-01

238

Modeling the ultra-wideband outdoor channel: model specification and validation  

Microsoft Academic Search

In this paper we establish a geometry-based stochastic ultra-wideband channel model for gas stations. We statistically describe the two-dimensional spatial location and power of clustered scatterers, and the shape of their visibility and shadowing regions. We also separately model the diffuse part of the impulse response (i.e., the part that cannot be explained by the scatterers' multipath components), and show

Telmo Santos; Fredrik Tufvesson; Andreas F. Molisch

2010-01-01

239

Research and design on ultra-wideband dielectric hemispheric lens loaded quad-ridged horn antenna  

Microsoft Academic Search

Based on the ultra-wideband ridged horn antenna theory in communication system, a new quad-ridged horn antenna with a lens is described in this paper, which consists of a quad-ridged horn and a dielectric hemispheric lens. By simulation and optimization with CST MWS software which is based on the finite integration technique, a dual polarization dielectric lens loaded quad-ridged horn antenna

Jinghui Qiu; Ying Suo; Wei Li

2007-01-01

240

The Impact of Physical Layer Frontend Characteristics on Ultra-Wideband Radio  

Microsoft Academic Search

Ultra-wideband communications systems use signals with very large bandwidths and very low power-spectral densities to achieve high data-rate communications at short ranges. The frequency-dependent characteristics of system components at such large frequency ranges pose system design challenges not encountered in narrowband communications. This paper highlights some of the distortive effects on signal propagation introduced by transceiver frontend components, and their

Wasim Q. Malik; David J. Edwards; Christopher J. Stevens

2005-01-01

241

UWB Pulse Generation in the 3.1-5.1GHz band David Marchaland, Martine Villegas, Genevi`eve Baudoin, Carlo Tinella and Didier Belot  

E-print Network

generator and antenna dedi- cated to UWB radio communication in 3.1-5.1GHz band and targeting sensor and BAN generator architecture is proposed followed by a study of radiated pulse through wideband and narrowband

Baudoin, Genevi鑦e

242

Prototype ultra wideband-based wireless body area network--consideration of CAP and CFP slot allocation during human walking motion.  

PubMed

This paper presents an experimental evaluation of communication during human walking motion, using the medium access control (MAC) evaluation system for a prototype ultra-wideband (UWB) based wireless body area network for suitable MAC parameter settings for data transmission. Its physical layer and MAC specifications are based on the draft standard in IEEE802.15.6. This paper studies the effects of the number of retransmissions and the number of commands of GTS (guaranteed time slot) request packets in the CAP (contention access period) during human walking motion by varying the number of sensor nodes or the number of CFP (contention free period) slots in the superframe. The experiments were performed in an anechoic chamber. The number of packets received is decreased by packet loss caused by human walking motion in the case where 2 slots are set for CFP, regardless of the number of nodes, and this materially decreases the total number of packets received. The number of retransmissions and the GTS request commands increase according to increases in the number of nodes, largely reflecting the effects of the number of CFP slots in the case where 4 nodes are attached. In the cases where 2 or 3 nodes are attached and 4 slots are set for CFP, the packet transmission rate is more than 95%. In the case where 4 nodes are attached and 6 slots are set for CFP, the packet transmission rate is reduced to 88% at best. PMID:23366429

Takei, Yuichiro; Katsuta, Hiroki; Takizawa, Kenichi; Ikegami, Tetsushi; Hamaguchi, Kiyoshi

2012-01-01

243

A Hybrid Deterministic-Stochastic Propagation Model for Short-Range MIMO-UWB Communication Systems  

NASA Astrophysics Data System (ADS)

This paper presents a computationally effective approach for including dense multipath components in ray tracing simulations of ultra wideband (UWB) channels. Through a combination of a standard ray tracing model with a simple geometric-stochastic model realistic scenario-specific simulations are possible. The frequency and direction selectivity of the channel are reproduced accurately by the model. The structure and parameters of the stochastic part of the model are derived from measurements in the FCC-UWB frequency range. Compared to conventional ray tracing simulations the proposed model reduces considerably the differences between simulated and measured channel characteristics.

Janson, Malgorzata; Pontes, Juan; F黦en, Thomas; Zwick, Thomas

2012-06-01

244

An iterative procedure for ultra-wideband imagery of space objects from distributed multi-band radar data  

NASA Astrophysics Data System (ADS)

A novel technique is proposed for ultra-wideband imagery of space objects from distributed multi-band radar data. The complex exponential (CE) model is used for representation of ultra-wideband radar signals, where an iterative procedure is developed for optimized model parameter estimation. A subband coherent processing technique is developed which combines the de-noising cross-correlation (DNCC) algorithm with statistical method to obtain the phase and amplitude incoherent parameters (ICP) between subbands. Ultra-wideband data fusion via two-dimensional gapped-data state space approach (2-D GSSA) is then applied to multiple subband signals for supper-resolution imagery. Experiments using computational electromagnetic data from the method of moment (MoM) as well as anechoic chamber measurement data are used to validate the proposed technique and demonstrate its applications.

Xu, Xiaojian; He, Feiyang

2014-09-01

245

A 128Channel 6 mW Wireless Neural Recording IC With Spike Feature Extraction and UWB Transmitter  

Microsoft Academic Search

This paper reports a 128-channel neural recording integrated circuit (IC) with on-the-fly spike feature extraction and wireless telemetry. The chip consists of eight 16-channel front-end recording blocks, spike detection and feature extraction digital signal processor (DSP), ultra wideband (UWB) transmitter, and on-chip bias generators. Each recording channel has amplifiers with programmable gain and bandwidth to accommodate different types of biological

Moo Sung Chae; Zhi Yang; Mehmet R. Yuce; Linh Hoang; Wentai Liu

2009-01-01

246

Single section Wilkinson type UWB power divider with bandpass filter and DC block characteristics in LTCC technology  

Microsoft Academic Search

This paper introduces a novel 1:2 U.S. ultra-wideband (UWB: 3.1-10.6 GHz) power divider with sharp roll-off bandpass filtering and DC blocking functions. The circuit consists of a ?\\/4 Y resonator, three capacitively coupled ?\\/2 short-circuited lines, and a resistor between the two output ports. The divider\\/bandpass filter (BPF) structure is simulated with ADS and HFSS, and realized with low-temperature co-fired

Thai Hoa Duong; Ihn S. Kim

2010-01-01

247

Single section Wilkinson type UWB power divider with bandpass filter and DC block characteristics in LTCC technology  

Microsoft Academic Search

This paper introduces a novel 1?2 U.S. ultra-wideband (UWB: 3.110.6 GHz) power divider with sharp roll-off bandpass filtering and DC blocking functions. The circuit consists of a lambda\\/4 Y resonator, three capacitively coupled lambda\\/2 short-circuited lines, and a resistor between the two output ports. The divider\\/bandpass filter (BPF) structure is simulated with ADS and HFSS, and realized with low-temperature co-fired

T. Duong; I. Kim

2010-01-01

248

Design and performance of contention based MAC protocols in WBAN for medical ICT using IR-UWB  

Microsoft Academic Search

This paper focuses on wireless body area networks (WBAN) targeted for medical ICT applications. The studied network follows a typical IEEE 802.15.4 beacon-enabled star topology. We simulate the collection of medical data from patients using wireless sensors. Impulse radio ultra wideband (IR-UWB) is chosen as a physical layer technology, in compliance with the IEEE 802.15.4a standard. Two random access methods,

Leena Kynsij鋜vi; Leonardo Goratti; Raffaello Tesi; Jari Iinatti; Matti H鋗鋖鋓nen

2010-01-01

249

A Comprehensive Study of Channel Estimation for WBAN-based Healthcare Systems: Feasibility of Using Multiband UWB  

Microsoft Academic Search

Wireless personal area network (WPAN) is an emerging in wireless technology for short range indoor and outdoor communication\\u000a applications. A more specific category of WPAN is the wireless body area network (WBAN) used for health monitoring. On the\\u000a other hand, multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) comes with a number of desirable\\u000a features at the physical layer for

S. M. Riazul Islam; Kyung Sup Kwak

250

Negative refractive index material-inspired 90-deg electrically tilted ultra wideband resonator  

NASA Astrophysics Data System (ADS)

A negative refractive index material loaded patch antenna is proposed for ultra wideband applications. The wideband operation has been achieved by creating a defected ground plane with a CNC shaped split ring resonator. The defected ground plane CNC resonator also exhibits a 90-deg electrical tilt. Two additional slots are engineered in the patch antenna for further bandwidth enhancement. A -10 dB bandwidth with an order of 57.89% has been achieved with a peak gain of 5.37 dBi at a 5.5 GHz resonant frequency. Measured results demonstrate good agreement with simulated results.

Upadhyaya, Trushit K.; Kosta, Shiv Prasad; Jyoti, Rajeev; Palandoken, Merih

2014-10-01

251

Silicon-Based Ultra-Wideband Beamforming J. Roderick, H. Krishnaswamy, K. Newton, and H. Hashemi  

E-print Network

B BW Tapped Delay Trombone Line Variable Delay d L Incident Wave UWB Beamforming Array UWB Chip Size: 2.5mm x 0.9mm Broadband Variable Gain Amplifier MSB Delay Element Trombone 8-tap Variable 100 200 300 d Ideal Antennas Input Time (ps) Output Time (ps) Performance Result UWB delay resolution

Southern California, University of

252

Ultra-Wideband GPR Imaging of the Vaucluse Karst Aquifer  

NASA Astrophysics Data System (ADS)

In this paper, we present the validation of an Ultra Wide band measurement system which is the first experimental step of the French MAXWELL Research Project devoted to the survey of the karst aquifer located in the Vaucluse in Provence. This radar system employs Exponentially Tapered Slot Antennas (ETSA), with a usable bandwidth from 100 MHz to 2.5 GHz. The antenna is driven by a .01- 26.5 GHz Agilent vector network analyzer (VNA), with a noise floor of -120dB under test conditions and a noise floor of -100 dB in a field setting. A synthetic pulse is applied to the antenna by using a classical step frequency sweeping. The recorded amplitudes and phases of the reflection coefficient (S11 parameter) are filtered and inverse Fourier transformed to obtain the time-domain data. In principal, due to the flat radiation characteristic of the frequency generator, appropriate synthetic pulses can be generated for analysis. The advantages of this approach are mainly, 1) a large depth resolution due to increased bandwidth, 2) a wider dynamic range for detection of weak late underground echoes, 3) a low signal distortion due to absence of pulse deconvolution post-processing. The foregoing system was deployed inside a tunnel in the Low-Noise Underground Laboratory (LSBB) located in Rustrel (France) which allows the use of low power radiation. Minimization of noise interference was accomplished by : 1) using low noise and low-loss cables, 2) using a PVC structure covered with absorbers to shield the ETSA from unwanted tunnel wall reflections and from radiation from the vector network analyzer, 3) an effective calibration of long cables to the antenna connector with careful cable unwinding to reduce phase errors, 4) a power level fixed at 8 dBm in the frequency band of interest to avoid distortion in the mixer of the VNA. Monostatic or multistatic data, were collected by moving manually the antennas along the PVC frame, in 5 cm increments over a length of 6 m. Both parallel and perpendicular polarizations were recorded. Data were obtained from 150 MHz to 2 GHz to reduce any reflections from the connection to the analyzer. Time sections were then processed after an inverse Fourier transform. To validate our results (from a geophysics point of view), reference data were also collected using 100, 250 and 500 MHz RAMAC GPR systems. Results are very promising especially regarding the resolution of the images, depth penetration and low emitting power. In future experiments, our approach could be still improved by using shorter cables, high directive antennas and absorbers to reduce coupling in multistatic configurations.

Dauvignac, J.; Fortino, N.; S閚閏hal, G.; Cresp, A.; Yedlin, M.; Gaffet, S.; Rousset, D.; Pichot, C.

2008-12-01

253

Free-space power combining and beam steering of ultra-wideband radiation using an array of laser-triggered antennas  

Microsoft Academic Search

A mode-locked laser is used to synchronize jitter-free ultrawideband (UWB) pulse generation at an array of UWB antenna elements. The jitter-free pulses radiated by each element add together in free space to produce a radiated field pattern that is steerable via optical true-time-delay techniques. The results from a three element array experiment are presented and used to develop a model

Eric E. Funk; Chi H. Lee

1996-01-01

254

Ultra wideband photonic control of an adaptive phased array antenna  

NASA Astrophysics Data System (ADS)

This paper presents a new concept for a photonic implementation of a time reversed RF antenna array beamforming system. The process does not require analog to digital conversion to implement and is therefore particularly suited for high bandwidth applications. Significantly, propagation distortion due to atmospheric effects, clutter, etc. is automatically accounted for with the time reversal process. The approach utilizes the reflection of an initial interrogation signal from off an extended target to precisely time match the radiating elements of the array so as to re-radiate signals precisely back to the target's location. The backscattered signal(s) from the desired location is captured by each antenna and used to modulate a pulsed laser. An electrooptic switch acts as a time gate to eliminate any unwanted signals such as those reflected from other targets whose range is different from that of the desired location resulting in a spatial null at that location. A chromatic dispersion processor is used to extract the exact array parameters of the received signal location. Hence, other than an approximate knowledge of the steering direction needed only to approximately establish the time gating, no knowledge of the target position is required, and hence no knowledge of the array element time delay is required. Target motion and/or array element jitter is automatically accounted for. This paper presents the preliminary study of the photonic processor, analytical justification, and simulated results. The technology has a broad range of applications including aerospace and defense and in medical imaging.

Cox, Joseph L.; Zmuda, Henry; Li, Jian; Sforza, Pasquale M.

2006-05-01

255

Fine Transmittance\\/Reflectivity Measurement System Using Single-Sideband Frequency Sweeper with Ultra-Wideband Hilbert Transformer  

Microsoft Academic Search

A wideband transmittance\\/reflectivity measurement system for fine-structured components is proposed. The optical single-sideband frequency sweeper with an ultra wideband Hilbert transformer enables excellent frequency sweep range between 2GHz-30GHz. Frequency resolution of 4.7MHz is experimentally obtained.

Tetsuya Kawanishi; Takahide Sakamoto; Daniel Fonseca; Adolfo Cartaxo; Paulo Monteiro; Masayuki Izutsu

2006-01-01

256

Ultra-Wideband Radar Measurements Over Bare and Snow-Covered Saline Ice S. Gogineniand P. Kanagaratnam  

E-print Network

Ultra-Wideband Radar Measurements Over Bare and Snow-Covered Saline Ice S. Gogineniand P. Kanagaratnam Radar Systems & Remote Sensing Laboratory University of Kansas 2291 Irving Hill Rd., Lawrence, KS-We developed an tiltra-wideband radar operating over frequencies from 500 MHz to 18 Ghz and used

Kansas, University of

257

Photonic generation of UWB impulses by using a Fabry-P閞ot semiconductor optical amplifier  

NASA Astrophysics Data System (ADS)

A novel approach to generating ultra-wideband (UWB) impulses based on a Mach-Zehnder modulator (MZM) and a Fabry-P閞ot semiconductor optical amplifier (FP-SOA) is proposed and demonstrated. Both the carrier dynamic behavior of SOA and the feedback of FP cavity are exploited to generate a pair of polarity-reversed doublet-like impulses. Simulations and experiments are carried out to verify the UWB generation. In the experiment, the fractional bandwidths of the negative-doublet-like and the positive-doublet-like impulses are 100% and 108%, respectively. The bit error rate (BER) performance of the UWB before and after a span of 19-km standard single mode fiber (SSMF) transmission is also investigated and error-free performance can be achieved for each condition. Finally the UWB wireless transmission over a span of 10 cm is investigated.

Yu, Yuan; Dong, Jianji; Jiang, Fan; Luo, Bowen; Zhang, Xinliang

2014-03-01

258

30 pJ/b, 67 Mbps, Centimeter-to-Meter Range Data Telemetry With an IR-UWB Wireless Link.  

PubMed

This paper reports an energy-efficient, impulse radio ultra wideband (IR-UWB) wireless link operating in 3-5 GHz for data telemetry over centimeter-to-meter range distances at rates extended to tens of Mbps. The link comprises an all-digital, integrated transmitter (TX) fabricated in 90 nm 1P/9M CMOS that incorporates a waveform-synthesis pulse generator and a timing generator for on-off-keying (OOK) pulse modulation and phase scrambling. The link also incorporates an energy-detection receiver (RX) realized with commercial off-the-shelf (COTS) components that performs radio-frequency (RF) filtering, amplification, logarithmic power detection for data demodulation and automatic level control for robust operation in the presence of distance variations. Employing a miniaturized, UWB, chip antenna for the TX and RX, wireless transmission of pseudo-random binary sequence (PRBS) data at rates up to 50 Mbps over 10 cm-1 m is shown. Further, employing a high-gain horn antenna for the RX, wireless transmission of PRBS data at rates up to 67 Mbps over 50 cm-4 m is shown with a TX energy consumption of 30 pJ/b (i.e., power consumption of 2 mW) from 1.2 V. The measured bit error rate (BER) in both cases is . Results from wireless recording of the background current of a carbon-fiber microelectrode (CFM) in one fast-scan cyclic voltammetry (FSCV) scan using the IR-UWB link are also included, exhibiting excellent match with those obtained from a conventional frequency-shift-keyed (FSK) link at ?433 MHz. PMID:25134088

Ebrazeh, Ali; Mohseni, Pedram

2014-08-12

259

DC-offset effect cancelation method using mean-padding FFT for automotive UWB radar sensor  

NASA Astrophysics Data System (ADS)

To improve road safety and realize intelligent transportation, Ultra-Wideband (UWB) radars sensor in the 24 GHz domain are currently under development for many automotive applications. Automotive UWB radar sensor must be small, require low power and inexpensive. By employing a direct conversion receiver, automotive UWB radar sensor is able to meet size and cost reduction requirements. We developed Automotive UWB radar sensor for automotive applications. The developed receiver of the automotive radar sensor is direct conversion architecture. Direct conversion architecture poses a dc-offset problem. In automotive UWB radar, Doppler frequency is used to extract velocity. The Doppler frequency of a vehicle can be detected using zero-padding Fast Fourier Transform (FFT). However, a zero-padding FFT error is occurs due to DC-offset problem in automotive UWB radar sensor using a direct conversion receiver. Therefore, dc-offset problem corrupts velocity ambiguity. In this paper we proposed a mean-padding method to reduce zero-padding FFT error due to DC-offset in automotive UWB radar using direct conversion receiver, and verify our proposed method with computer simulation and experiment using developed automotive UWB radar sensor. We present the simulation results and experiment result to compare velocity measurement probability of the zero-padding FFT and the mean-padding FFT. The proposed algorithm simulated using Matlab and experimented using designed the automotive UWB radar sensor in a real road environment. The proposed method improved velocity measurement probability.

Ju, Yeonghwan; Kim, Sang-Dong; Lee, Jong-Hun

2011-06-01

260

A SDR ULTRA-WIDEBAND IMPULSE COMMUNICATION SYSTEM FOR LOW AND HIGH DATA RATES  

Microsoft Academic Search

The paper proposes a new way of considering software radio in the specific context of UWB. Due to the extremely wide-band nature of UWB signals, it is shown that a first stage of analog pre-processing is mandatory to make SDR applicable in this context, in other words to obtain flexible or multi-purpose UWB systems. But not any analog front- end

Christophe MOY; St閜hane PAQUELET; Alexis BISIAUX; Apostolos KOUNTOURIS

261

Design, Modeling and Numerical Analysis of Microwave and Optical Devices: The Multi-band Patch Antenna, Ultra Wideband Ring Filter and Plasmonic Waveguide Coupler  

E-print Network

In this dissertation, three devices are studied and devised for the applications in microwave and optical communication: (1) Multiband Patch Antenna, (2) Ultra-Wideband Band Pass Ring Filter and (3) Plasmonic Waveguide Coupler with High Coupling...

Liu, Ya-Chi

2014-01-14

262

Design and performance of an ultra-wideband stepped-frequency radar with precise frequency control for landmine and IED detection  

NASA Astrophysics Data System (ADS)

The Army Research Laboratory (ARL) has developed an impulse-based vehicle-mounted forward-looking ultra- wideband (UWB) radar for imaging buried landmines and improvised explosive devices (IEDs). However, there is no control of the radiated spectrum in this system. As part of ARL's Partnerships in Research Transition (PIRT) program, the above deficiency is addressed by the design of a Stepped-Frequency Radar (SFR) which allows for precise control over the radiated spectrum, while still maintaining an effective ultra-wide bandwidth. The SFR utilizes a frequency synthesizer which can be configured to excise prohibited and interfering frequency bands and also implement frequency-hopping capabilities. The SFR is designed to be a forward-looking ground- penetrating (FLGPR) Radar utilizing a uniform linear array of sixteen (16) Vivaldi notch receive antennas and two (2) Quad-ridge horn transmit antennas. While a preliminary SFR consisting of four (4) receive channels has been designed, this paper describes major improvements to the system, and an analysis of expected system performance. The 4-channel system will be used to validate the SFR design which will eventually be augmented in to the full 16-channel system. The SFR has an operating frequency band which ranges from 300 - 2000 MHz, and a minimum frequency step-size of 1 MHz. The radar system is capable of illuminating range swaths that have maximum extents of 30 to 150 meters (programmable). The transmitter has the ability to produce approximately -2 dBm/MHz average power over the entire operating frequency range. The SFR will be used to determine the practicality of detecting and classifying buried and concealed landmines and IEDs from safe stand-off distances.

Phelan, Brian R.; Sherbondy, Kelly D.; Ranney, Kenneth I.; Narayanan, Ram M.

2014-05-01

263

CCS: a railway corridor control system utilizing ultra wideband radio technology  

Microsoft Academic Search

Ultra wide band (UWB) radio is a unique technology, which combines a megabit wireless local area network with a centimeter-resolution radiolocation (RADAR) capability over, distances less than 100 meters. A linear chain of UWB nodes can be used to create a hop-by-hop data transmission network, which also forms a RADAR \\

Paul A. Flaherty

2004-01-01

264

Ultra-Wideband Printed-Circuit Array Antenna for Medical Monitoring Applications  

E-print Network

structure for medical monitoring purpose is introduced. It consists of one single transmitting antenna would be to detect a person's heart and respiration rates [1] [3]. Figure 1. UWB antenna structure of patients in elder care and health care facilities. The UWB antenna structure in Fig. 1 is designed

Bornemann, Jens

265

Localization via ultra-wideband radios: a look at positioning aspects for future sensor networks  

Microsoft Academic Search

UWB technology provides an excellent means for wireless positioning due to its high resolution capability in the time domain. Its ability to resolve multipath components makes it possible to obtain accurate location estimates without the need for complex estimation algorithms. In this article, theoretical limits for TOA estimation and TOA-based location estimation for UWB systems have been considered. Due to

Sinan Gezici; Zhi Tian; Georgios B. Giannakis; Hisashi Kobayashi; Andreas F. Molisch; H. Vincent Poor; Zafer Sahinoglu

2005-01-01

266

Impact of Mobility on Ranging Estimation using UltraWideband Arturo Guizar*  

E-print Network

.ouni@telecom-paristech.fr 1 Introduction e-Health based on Wireless Body Area Networks (WBAN) is gaining more and more-UWB sensors. 2 System Model and Results We consider a WBAN using IR-UWB technology. For the sake of simplicity

Paris-Sud XI, Universit de

267

UWB Tracking System Design with TDOA Algorithm  

NASA Technical Reports Server (NTRS)

This presentation discusses an ultra-wideband (UWB) tracking system design effort using a tracking algorithm TDOA (Time Difference of Arrival). UWB technology is exploited to implement the tracking system due to its properties, such as high data rate, fine time resolution, and low power spectral density. A system design using commercially available UWB products is proposed. A two-stage weighted least square method is chosen to solve the TDOA non-linear equations. Matlab simulations in both two-dimensional space and three-dimensional space show that the tracking algorithm can achieve fine tracking resolution with low noise TDOA data. The error analysis reveals various ways to improve the tracking resolution. Lab experiments demonstrate the UWBTDOA tracking capability with fine resolution. This research effort is motivated by a prototype development project Mini-AERCam (Autonomous Extra-vehicular Robotic Camera), a free-flying video camera system under development at NASA Johnson Space Center for aid in surveillance around the International Space Station (ISS).

Ni, Jianjun; Arndt, Dickey; Ngo, Phong; Phan, Chau; Gross, Julia; Dusl, John; Schwing, Alan

2006-01-01

268

Single-element based ultra-wideband antenna array concepts for wireless high-precision 2-D local positioning  

NASA Astrophysics Data System (ADS)

We generally categorize the approaches for ultra-wideband antenna array design, and consequently propose simplified concepts for antenna arrays for a high-precision, ultra-wideband FMCW radar 2-D local positioning system to obtain robustness against multi path interference, perform angle of arrival analysis, as well as instantaneous heading estimation. We focus on low-cost and mechanical robust, industrial-application ready antennas. The antenna arrays are optimized for operation in the 5 GHz to 8 GHz frequency range and are designed towards supporting full omnidirectional 360 as well as partial half-plane direction of arrival estimation. Two different concepts for vehicle- as well as wall-mounted antenna array systems are proposed and discussed. We propose a wideband unidirectional bow-tie antenna array element having 97% impedance and 37% pattern bandwidth and a robust vehicle mounted omnidirectional antenna element having more than 85% impedance and pattern bandwidth.

Gardill, M.; Fischer, G.; Weigel, R.; Koelpin, A.

2013-07-01

269

A statistical ultra-wideband indoor channel model and the effects of antenna directivity on path loss and multipath propagation  

Microsoft Academic Search

Ultra-wideband indoor line-of-sight frequency-domain channel measurements have been performed in the 2-6 GHz frequency band using three different transmit\\/receive antenna combination pairs. The effects of antenna directivity on path loss and multipath propagation in the channel are analyzed extensively for various omnidirectional and directional antenna combinations. A statistical model of the path loss in the channel is presented, in which

Jason A. Dabin; Alexander M. Haimovich; Haim Grebel

2006-01-01

270

Ultra-wideband double vertical knife-edge model for obstruction of a ray by a person  

Microsoft Academic Search

We present a novel simple analytical model for the shadowing caused by a person that moves through an ultra-wideband ray. The model uses two vertical knife-edges plus phase and amplitude correction terms to determine the loss caused by the person at different perpendicular distances to the ray. In conjunction with the personpsilas trajectory the time-dependent shadowing loss can be determined,

J. Kunisch; J. Pamp

2008-01-01

271

An Electronic Circuit System for Time-Reversal of Ultra-Wideband Short Impulses Based on Frequency-Domain Approach  

Microsoft Academic Search

In this paper, a compact and low-cost electronic circuit system is designed for time-reversal of ultra-wideband short impulses (with nanosecond and sub-nanosecond temporal durations). A frequency-domain approach is adopted to avoid high sampling rate in time. Specifically, the proposed system obtains the discrete spectra of input impulses first; then realizes time-reversal in frequency domain; and finally synthesizes the time-reversed impulses

Huiqing Zhai; Shaoshu Sha; Varun K. Shenoy; Sungyong Jung; Mingyu Lu; Kyoungwon Min; Sungchul Lee; Dong S. Ha

2010-01-01

272

Ultra-Wideband Bandpass Filters Using Quarter-Wave Short-Circuited Shunt Stubs and Quarter-Wave Series Transformers  

Microsoft Academic Search

This letter introduces a topology of a very wideband filter intended for the use in ultra-wideband 3.1-10.6 GHz applications. Basic filter configuration consists of quarter-wave short-circuited stubs and quarter-wave series transformers. To improve the out-of-band rejection, a low-pass filter is added across the symmetry plane. The proposed component is fabricated in a planar microstrip configuration; however, the topology can be

Manseok Uhm; Kichul Kim; Dejan S. Filipovic

2008-01-01

273

Effect of the antenna-body distance on the on-ext and on-on channel link path gain in UWB WBAN applications.  

PubMed

This paper investigates the effect of the operation distance (i.e., practical use) between an antenna and a human body on wireless body area network (WBAN) channel path gain. Different use cases in WBAN on-external (ext) and on-on links with different antenna-body distances for ultra wideband (UWB) technology are considered. These studies are carried out with two types of planar UWB antennas in the vicinity of a real human body. Corresponding scenarios are repeated by computer simulations, and differences between these environs (i.e., challenges in the modelling of the measurement situation) are analysed and discussed. PMID:24109919

Tuovinen, T; Kumpuniemi, T; Hamalainen, M; Yekeh Yazdandoost, K; Iinatti, J

2013-01-01

274

The New Vector Fitting Approach to Multiple Convex Obstacles Modeling for UWB Propagation Channels  

NASA Astrophysics Data System (ADS)

This chapter presents the new approach to time-domain modeling of UWB channels containing multiple convex obstacles. Vector fitting (VF) algorithm (rational approximation) was used for deriving the closed form impulse response of multiple diffraction ray creeping on a cascade of convex obstacles. VF algorithm was performed with respect to new generalized variables proportional to frequency but including geometrical parameters of the obstacles also. The limits of approximation domain for vector fitting algorithm follow the range of ultra-wideband (UWB) channel parameters that can be met in practical UWB channel scenarios. Finally, the closed form impulse response of a creeping UTD ray was obtained. As the result we obtained impulse response of the channel as a function of normalized, with respect to geometrical parameters of the obstacles, time. It permits for calculation of channel responses for various objects without changing the body of a rational function. In that way the presented approach is general, simple, and effective.

G髍niak, P.; Bandurski, W.

275

Design of CMOS integrated frequency synthesizers for ultra-wideband wireless communications systems  

E-print Network

Ultra瑆ide band (UWB) system is a breakthrough in wireless communication, as it provides data rate one order higher than existing ones. This dissertation focuses on the design of CMOS integrated frequency synthesizer and its building blocks used...

Tong, Haitao

2009-05-15

276

CMOS Integrated Circuit Design for Ultra-Wideband Transmitters and Receivers  

E-print Network

radar, distance sensor, through wall radar to high speed, short distance communications. The CMOS integrated circuit is an attractive, low cost approach for implementing UWB technology. The improving cut-off frequency of the transistor in CMOS process...

Xu, Rui

2010-10-12

277

Self organization of wireless sensor networks using ultra-wideband radios  

DOEpatents

A novel UWB communications method and system that provides self-organization for wireless sensor networks is introduced. The self-organization is in terms of scalability, power conservation, channel estimation, and node synchronization in wireless sensor networks. The UWB receiver in the present invention adds two new tasks to conventional TR receivers. The two additional units are SNR enhancing unit and timing acquisition and tracking unit.

Dowla, Farid U. (Castro Valley, CA); Nekoogar, Franak (San Ramon, CA); Spiridon, Alex (Palo Alto, CA)

2009-06-16

278

Short-Range Ultra-Wideband Systems UMass Antenna Lab USC UltRa Lab UC Berkeley BWRC  

E-print Network

directions that may be interesting UWB Antenna Theory and Design David Pozar Electrical and Computer Recent Results: CAD Software for Modeling Arbitrary UWB Antennas and Links How can antennas and realistic: Practical Antenna Designs for UWB Systems What is the best antenna for UWB radio systems ? The choice

Southern California, University of

279

UWB communication system with pulse interleaving multiple access for active RFID  

Microsoft Academic Search

We present a UWB two-way communication system with novel PHY and MAC layers, for low-rate communications with multitude of low-cost devices in ultra low power consumption. The system features a novel multiple access protocol called interleaved impulse radio. In this simple protocol the transmission is done in short bursts of about 100 ns with large gaps between them. During the

Dani Raphaeli; Gidi Kaplan

2009-01-01

280

Improved Resolution and Reduced Clutter in Ultra-Wideband Microwave Imaging Using Cross-Correlated Back Projection: Experimental and Numerical Results  

PubMed Central

Microwave breast cancer detection is based on the dielectric contrast between healthy and malignant tissue. This radar-based imaging method involves illumination of the breast with an ultra-wideband pulse. Detection of tumors within the breast is achieved by some selected focusing technique. Image formation algorithms are tailored to enhance tumor responses and reduce early-time and late-time clutter associated with skin reflections and heterogeneity of breast tissue. In this contribution, we evaluate the performance of the so-called cross-correlated back projection imaging scheme by using a scanning system in phantom experiments. Supplementary numerical modeling based on commercial software is also presented. The phantom is synthetically scanned with a broadband elliptical antenna in a mono-static configuration. The respective signals are pre-processed by a data-adaptive RLS algorithm in order to remove artifacts caused by antenna reverberations and signal clutter. Successful detection of a 7?mm diameter cylindrical tumor immersed in a low permittivity medium was achieved in all cases. Selecting the widely used delay-and-sum (DAS) beamforming algorithm as a benchmark, we show that correlation based imaging methods improve the signal-to-clutter ratio by at least 10?dB and improves spatial resolution through a reduction of the imaged peak full-width half maximum (FWHM) of about 4050%. PMID:21331362

Jacobsen, S.; Birkelund, Y.

2010-01-01

281

UWB-WBAN sensor node design  

Microsoft Academic Search

In this paper, we discuss the hardware development of a UWB sensor node for wireless body area networks. A few unique UWB pulse generation techniques have been discussed. The sensor node transmits multiple pulses per bit to increase the average power of the transmitted signal in order to improve the bit-error rate (BER) performance. The multiple-pulse per bit technique is

Ho Chee Keong; M. R. Yuce

2011-01-01

282

UWB Tracking System Design for Lunar/Mars Exploration  

NASA Technical Reports Server (NTRS)

This paper describes a design effort for a prototype ultra-wideband (UWB) tracking system that is currently under development at NASA Johnson Space Center (JSC). The system is being studied for use in tracking of lunar/Mars rovers during early exploration missions when satellite navigation systems are not available. The UWB technology is exploited to implement the tracking system due to its properties such as high data rate, fine time resolution, low power spectral density, and multipath immunity. A two-cluster prototype design using commercially available UWB products is proposed to implement the Angle Of Arrival (AOA) tracking methodology in this research effort. An AOA technique using the Time Difference Of Arrival (TDOA) information is utilized for location estimation in the prototype system, not only to exploit the precise time resolution possible with UWB signals, but also to eliminate the need for synchronization between the transmitter and the receiver. After the UWB radio at each cluster is used to obtain the TDOA estimates from the UWB signal sent from the target, the TDOA data is converted to AOA data to find the angle of arrival, assuming this is a far field application. Since the distance between two clusters is known, the target position is computed by a simple triangulation. Simulations show that the average tracking error at a range of 610 meters is 2.7595 meters, less than 0.5% of the tracking range. Outdoor tests to track the SCOUT vehicle (The Science Crew Operations and Utility Testbed) near the Meteor Crater, Flagstaff, Arizona were performed on September 12-13, 2005. The tracking performance was obtained with less than 1% tracking error at ranges up to 2000 feet. No RF interference with on-board GPS, video, voice and telemetry systems was detected. Outdoor tests demonstrated the UWB tracking capability.

Ni, Jianjun; Arndt, Dickey; Ngo, Phong; Phan, Chau; Gross, Julia

2006-01-01

283

Body Area Networks performance analysis using UWB.  

PubMed

The successful realization of a Wireless Body Area Network (WBAN) using Ultra Wideband (UWB) technology supports different medical and consumer electronics (CE) applications but stand in a need for an innovative solution to meet the different requirements of these applications. Previously, we proposed to use adaptive processing gain (PG) to fulfill the different QoS requirements of these WBAN applications. In this paper, interference occurred between two different BANs in a UWB-based system has been analyzed in terms of acceptable ratio of overlapping between these BANs' PG providing the required QoS for each BAN. The first BAN employed for a healthcare device (e.g. EEG, ECG, etc.) with a relatively longer spreading sequence is used and the second customized for entertainment application (e.g. wireless headset, wireless game pad, etc.) where a shorter spreading code is assigned. Considering bandwidth utilization and difference in the employed spreading sequence, the acceptable ratio of overlapping between these BANs should fall between 0.05 and 0.5 in order to optimize the used spreading sequence and in the meantime satisfying the required QoS for these applications. PMID:24109913

Fatehy, Mohammed; Kohno, Ryuji

2013-01-01

284

A circular-shaped time-delay line inspired by CRLH TL unit cell for UWB operation  

NASA Astrophysics Data System (ADS)

This paper presents the design of a circular-shaped ultra-wideband (UWB) time-delay lines inspired by the use of composite right/left-handed transmission line (CRLH TL) unit cells. A rotated version of a conventional CRLH TL unit cell is used as the basic element to achieve UWB operation. For comparison, time-delay lines using the right-handed transmission line (RH TL) and CRLH TL unit cells are also studied, fabricated and tested. Simulation and measurement results show that our proposed time-delay lines have high return loss, low insertion loss, UWB operation and much longer time delays than that of the time-delay line based on RH TL.

Zhang, Jun; Cheung, S. W.; Zhu, Qi; Wu, Long; Zhang, Yong

2014-10-01

285

Multiple Access Interference Reduction Using Received Response Code Sequence for DS-CDMA UWB System  

NASA Astrophysics Data System (ADS)

This paper proposes a combination of novel Received Response (RR) sequence at the transmitter and a Matched Filter-RAKE (MF-RAKE) combining scheme receiver system for the Direct Sequence-Code Division Multiple Access Ultra Wideband (DS-CDMA UWB) multipath channel model. This paper also demonstrates the effectiveness of the RR sequence in Multiple Access Interference (MAI) reduction for the DS-CDMA UWB system. It suggests that by using conventional binary code sequence such as the M sequence or the Gold sequence, there is a possibility of generating extra MAI in the UWB system. Therefore, it is quite difficult to collect the energy efficiently although the RAKE reception method is applied at the receiver. The main purpose of the proposed system is to overcome the performance degradation for UWB transmission due to the occurrence of MAI during multiple accessing in the DS-CDMA UWB system. The proposed system improves the system performance by improving the RAKE reception performance using the RR sequence which can reduce the MAI effect significantly. Simulation results verify that significant improvement can be obtained by the proposed system in the UWB multipath channel models.

Toh, Keat Beng; Tachikawa, Shin'ichi

286

Experimental evaluation of a SAGE algorithm for ultra wideband channel sounding in an anechoic chamber  

Microsoft Academic Search

The paper presents the results of experiments in an anechoic chamber that assessed the reliability of a UWB channel sounding system based on a deterministic approach with a SAGE algorithm. The system could resolve and detect waves separated by 10 in the angle domain, which was near the resolution limit. In the delay domain, waves separated by 0.67 ns could

K. Haneda; J. I. Takada; T. Kobayashi

2004-01-01

287

Performance of an Optimally Spaced PPM Ultra-Wideband System with Direct Sequence  

E-print Network

position modulation (PPM) for data modulation and direct sequence (DS) spreading for multiple access]. Time hopping (TH) has been found to be a good technique for multiple access [1]. Direct sequence (DS signaling for UWB systems with direct sequence spreading for multiple access and compare the performance

Liu, Huaping

288

An all-digital transmitter for pulsed ultra-wideband communication  

E-print Network

Applications like sensor networks, medical monitoring, and asset tracking have led to a demand for energy-efficient and low-cost wireless transceivers. These types of applications typically require low effective data rates, ...

Mercier, Patrick Philip

2008-01-01

289

UWB communication receiver feedback loop  

DOEpatents

A novel technique and structure that maximizes the extraction of information from reference pulses for UWB-TR receivers is introduced. The scheme efficiently processes an incoming signal to suppress different types of UWB as well as non-UWB interference prior to signal detection. Such a method and system adds a feedback loop mechanism to enhance the signal-to-noise ratio of reference pulses in a conventional TR receiver. Moreover, sampling the second order statistical function such as, for example, the autocorrelation function (ACF) of the received signal and matching it to the ACF samples of the original pulses for each transmitted bit provides a more robust UWB communications method and system in the presence of channel distortions.

Spiridon, Alex (Palo Alto, CA); Benzel, Dave (Livermore, CA); Dowla, Farid U. (Castro Valley, CA); Nekoogar, Faranak (San Ramon, CA); Rosenbury, Erwin T. (Castro Valley, CA)

2007-12-04

290

Novel Dual-band Slot Antenna Design for Bluetooth and UWB Applications  

NASA Astrophysics Data System (ADS)

A novel technique to introduce an additional low frequency band to compact ultra wideband (UWB) slot antennas is proposed in this paper. To get an additional Bluetooth band, a parasitic strip is mounted on the back side of the slot edge. Because of the interaction of the strip and the slot edge, the Bluetooth band can be obtained while a notch band between the Bluetooth band and UWB band also appears. Two types of feeding, coplanar waveguide and microstrip line, are investigated. The proposed antennas are both fabricated on a low-cost FR4 substrate and have compact size (24 mm 28 mm 1 mm). The good agreement between measured and simulated results verifies our design.

Huang, Hai-Yan; Shao, Wei; Wang, Bing-Zhong; Ma, Xiao-Liang

2014-05-01

291

Time-Frequency Transform Techniques Applied to Ultra-wideband Ground-Penetrating Radar  

NASA Astrophysics Data System (ADS)

Background Recently, Dauvignac et al [1] utilized a ground penetrating radar unit consisting of an exponentially tapered slot antenna (ETSA) of the Vivaldi type, connected to an Agilent vector network analyzer to obtain a densely-sampled profile in the anti-blast tunnel of LSBB (Low-Noise inter-Disciplinary Underground Science & Technology Laboratory) located in Rustrel, France. The frequency data, from 150 MHz to 2 GHz, was inverse Fourier-transformed to obtain the time dependent data. Simultaneously, the same profile was obtained using a RAMAC 500 MHz ground-penetrating radar unit. Initial comparison of both data sets was done in the time-domain. Data obtained from the ETSA will be inverted using a constrained least squares algorithm, in order that the depth-dependent permittivity can be inferred. As a quality control, the RAMAC data will also be inverted. The resulting permittivity profiles obtained in both inversions will be used to image water content over a depth of several meters. Proposed Research It is well-known, qualitatively in the ground penetrating radar literature that high frequencies appear at early times, but generally are attenuated at later times, essentially due to the skin effect. However, a signal-processing verification of this well-known result is needed. We propose to use the Stockwell or S transform [2] to determine the temporal location of frequencies in both of the foregoing datasets. The S transform, a short-time Fourier transform with a frequency-dependent window, will be described and applied to synthetic data. Then the application of the S transform to the RAMAC and ETSA data will be presented, after each data set has undergone the same pre-processing. The S transform is completely linear and preserves the phase of the data, which allows for easy interpretation of the operations of filtering, due to the linear inverse of the forward S transform. Thus the S transform is ideal for comparing the temporal distribution of frequency in these two datasets. BIBLIOGRAPHY [1] DAUVIGNAC J.-Y., N. FORTINO, G. SENECHAL, A. CRESP, M. YEDLIN, S. GAFFET, D. ROUSSET, and C. PICHOT, "Ultra-Wideband GPR Imaging of the Vaucluse Karst Aquifer", American Geophysical Union, Fall Meeting 2008, Abstract #NS51A-08. [2] STOCKWELL R. G., L. MANSINHA, R. P. LOWE, "Localization of the complex spectrum: the S transform", IEEE Transactions on Signal Processing, vol.44, n4, pp 998-1001, April 1996.

Yedlin, M.; Cresp, A.; Dauviganc, J. Y.; Gaffet, S.; S閚閏hal, G.; Fortino, N.; Pichot, C.; Aliferis, I.

2009-04-01

292

Abstract--We present a statistical model for the path loss of ultra-wideband channels in indoor environments. In contrast to  

E-print Network

Abstract-- We present a statistical model for the path loss of ultra-wideband channels in indoor); and local spatial averaging is included. As before, the center frequency is 5.0 GHz. Separate models) and non-line-of-sight (NLS) paths. All four models have the same mathematical structure, differing only

Kavcic, Aleksandar

293

A 264 MHz CMOS Gm桟 LPF for ultra-wideband standard  

NASA Astrophysics Data System (ADS)

A 264 MHz CMOS 4th Gm桟 LPF target for the UWB standard is presented. The filter is designed by cascading two biquad cells. Compared with the previously published biquad cells, the biquad proposed here saves 1 transconductor, 3 CMFB networks and 2 capacitors. Benefiting from these merits, the power consumption and chip area of the 4th order UWB LPF are reduced dramatically without other characteristics being affected. The LPF is designed and fabricated with TSMC 0.18 ?m 1P6M CMOS technology. The implemented LPF achieves a power gain of -0.5 dB. The measured frequency response matches well with that of the simulating results. The core chip area is only 0.06 mm2, which has a wonderful advantage over those from similar work. The LPF excluding test-buffers dissipates a total current of 3 mA from the 1.8 V power supply.

Zhendong, Gao; Zhiqiang, Li; Hongkun, Li; Haiying, Zhang

2010-11-01

294

A Framework for UWB-Based Communication and Location Tracking Systems for Wireless Sensor Networks  

PubMed Central

Ultra wideband (UWB) radio technology is nowadays one of the most promising technologies for medium-short range communications. It has a wide range of applications including Wireless Sensor Networks (WSN) with simultaneous data transmission and location tracking. The combination of location and data transmission is important in order to increase flexibility and reduce the cost and complexity of the system deployment. In this scenario, accuracy is not the only evaluation criteria, but also the amount of resources associated to the location service, as it has an impact not only on the location capacity of the system but also on the sensor data transmission capacity. Although several studies can be found in the literature addressing UWB-based localization, these studies mainly focus on distance estimation and position calculation algorithms. Practical aspects such as the design of the functional architecture, the procedure for the transmission of the associated information between the different elements of the system, and the need of tracking multiple terminals simultaneously in various application scenarios, are generally omitted. This paper provides a complete system level evaluation of a UWB-based communication and location system for Wireless Sensor Networks, including aspects such as UWB-based ranging, tracking algorithms, latency, target mobility and MAC layer design. With this purpose, a custom simulator has been developed, and results with real UWB equipment are presented too. PMID:22164120

Ch髄iz, Juan; Hern醤dez, 羘gela; Valdovinos, Antonio

2011-01-01

295

An ultra-wideband wire spiral antenna for in-body communications using different material matching layers.  

PubMed

In this work an ultra-wideband wire antenna was designed and fabricated for transmitting/receiving signals to/from inside the human body. The antenna provides high gain and thus high field intensity in its broadside direction; hence, a high energy density wireless can be established with the inner body. The proposed antenna operates in the frequency band of 3-10 GHz with an impedance of 200 Ohms in free space. The antenna was embedded in different materials with permittivity values ranging from 12 to 74 in order to evaluate the matching layer effect on wave propagation from outside to inside the body. The antenna port impedance was adjusted by using matching circuits. The electric field intensity inside the human chest was calculated for different materials and depths. The best improvement in wave penetration was obtained for the frequency band of 750-1000 MHz by embedding the antenna inside a material with permittivity equal to 27. PMID:25571603

Khaleghi, Ali; Balasingham, Ilangko; Chavez-Santiago, Raul

2014-01-01

296

A Hybrid TOA-Fingerprinting Based Localization of Mobile Nodes Using UWB Signaling for Non Line-Of-Sight Conditions  

PubMed Central

Recently, Impulse Radio Ultra Wideband (IR-UWB) signaling has become popular for providing precise location accuracy for mobile and wireless sensor node localization in the indoor environment due to its large bandwidth and high time resolution while providing ultra-high transmission capacity. However, the Non-line-of-sight (NLOS) error mitigation has considerable importance in localization of wireless nodes. In order to mitigate NLOS errors in indoor localization this paper proposes and investigates a novel approach which creates a hybrid combination of channel impulse response (CIR)-based fingerprinting (FP) positioning and an iterative Time of Arrival (TOA) real time positioning method using Ultra Wideband (UWB) signaling. Besides, to reduce the calculation complexities in FP method, this paper also introduces a unique idea for the arrangement of reference nodes (or tags) to create a fingerprinting database. The simulation results confirm that the proposed hybrid method yields better positioning accuracies and is much more robust in NLOS error mitigation than TOA only and FP only and a conventional iterative positioning method. PMID:23112651

Kabir, Md. Humayun; Kohno, Ryuji

2012-01-01

297

An Integrated Ultra-Wideband Timed Array Receiver in 0.13 ?m CMOS Using a Path-Sharing True Time Delay Architecture  

Microsoft Academic Search

A fully integrated CMOS ultra-wideband 4-channel timed array receiver for high-resolution imaging application is presented. A path-sharing true time delay architecture is implemented to reduce the chip area for integrated circuits. The true time delay resolution is 15 ps and the maximum delay is 225 ps. The receiver provides 11 scan angles with almost 9 degrees of spatial resolution for

Ta-Shun Chu; Jonathan Roderick; Hossein Hashemi

2007-01-01

298

On IEEE 802.15.6 IR-UWB receivers - simulations for DBPSK modulation.  

PubMed

In 2002, Federal Communications Commission (FCC) was the first in defining regulations for ultra wideband (UWB) communications followed by Europe and Japan some years later. Focusing on impulse radio (IR) UWB, in 2007 was the time for the first published standard targeting in personal area networks, released by the IEEE. The second IEEE released standard including UWB definitions is targeted for wireless body area networks (WBAN) and was published in 2012. As the wireless communications has been and will be passing through almost any levels in society, the natural step with WBAN is using it in different medical, healthcare and wellbeing applications. The arguments for these are related to the modern lifestyle, in which people have increasingly more free time and are more interested in taking care of their health and wellbeing. Another challenge is the population composition, i.e., aging in developed countries which call for new solutions and procedures, particularly from cost wise. In this paper, we are evaluating UWB receivers based on the IEEE 802.15.6 physical layer definitions and capable of detecting differentially encoded modulation. The evaluation is performed using two different WBAN channel models. PMID:24110027

Niemel, Ville; H鋗鋖鋓nen, Matti; Iinatti, Jari

2013-01-01

299

A comprehensive study of channel estimation for WBAN-based healthcare systems: feasibility of using multiband UWB.  

PubMed

Wireless personal area network (WPAN) is an emerging in wireless technology for short range indoor and outdoor communication applications. A more specific category of WPAN is the wireless body area network (WBAN) used for health monitoring. On the other hand, multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) comes with a number of desirable features at the physical layer for wireless communications, for example, very high data rate. One big challenge in adoption of multiband UWB in WBAN is the fact that channel estimation becomes difficult under the constraint of extremely low transmission power. Moreover, the heterogeneous environment of WBAN causes a dense multipath wireless channel. Therefore, effective channel estimation is required in the receiver of WBAN-based healthcare system that uses multiband UWB. In this paper, we first outline the MB-OFDM UWB system. Then, we present an overview of channel estimation techniques proposed/investigated for multiband UWB communications with emphasis on their strengths and weaknesses. Useful suggestions are given to overcome the weaknesses so that these methods can be particularly useful for WBAN channels. Also, we analyze the comparative performances of the techniques using computer simulation in order to find the energy-efficient channel estimation methods for WBAN-based healthcare systems. PMID:21046206

Islam, S M Riazul; Kwak, Kyung Sup

2012-06-01

300

Development of an electronically tunable ultra-wideband radar imaging sensor and its components  

E-print Network

microstrip quasi-horn antenna was optimized for short pulse transmission with respect to the input return loss and the pulse stretching effect. For signal detection in the signal processing stage, the background subtraction technique and B-scan data format...

Han, Jeongwoo

2006-08-16

301

Standardization on body area network and a prototype system based on UWB.  

PubMed

Body area network (BAN) is a promising wireless technology that realizes wireless connectivity among vital signal sensors deployed on human body. Monitoring various vital signals collected through BAN provides an efficient way to lower disease occurrence rate and reduce medical expenditure. Task Group 6 (TG6) within the IEEE 802 Local and Metropolitan Area Network Standards Committee is developing a BAN standard, i.e., IEEE 802.15.6. In which, specifications of three physical layers (PHYs) and a single common medium access control (MAC) are being drafted. The standardization process has been continuing for several years in the Task Group 6 (TG6) under Working Group 15 (WG). In this paper, we describe the up-to-date status of IEEE 802.15.6 standardization. Some main specifications under drafting are presented. Moreover, as an effort of implementing a BAN model, a prototype BAN system based on the high band of ultra-wideband (UWB) is demonstrated. PMID:21365254

Li, Huan-Bang; Kohno, Ryuji

2011-10-01

302

Feasibility study of a low-cost system-on-a-chip UWB pulse radar on silicon for the heart monitoring  

Microsoft Academic Search

In February 2002 the FCC authorized the marketing of a new class of radiofrequency devices: the ultra-wide-band (UWB) systems. One of the most interesting applications for which the UWB systems are addressed is related to the medical imaging. This paper addresses the feasibility study of a novel fully integrated 3.1-10.6 GHz UWB radar on a standard silicon technology for the

Domenico Zito; Domenico Pepe; Bruno Neri; Danilo De Rossi

2007-01-01

303

Performance evaluation on FPGA-implemented UWB-IR receiver for in-body to out-of-body communication systems.  

PubMed

In order to design an optimized transceiver structure of ultra wideband (UWB) transmission in in-body to out-of-body communications, it is necessary to make the transceiver structure be easily adjustable in order to realize a good communication performance in an experimental environment. For this purpose, we first implement our develop UWB-impulse radio (IR) receiver structure for the in-body to out-of-body communication in a field programmable gate array (FPGA) board, and evaluate the fundamental communication performance of the FPGA-implemented UWB-IR receiver by a biological-equivalent liquid phantom experiment. The FPGA configuration results indicate that our FPGA realization of the UWB-IR receiver has accomplished good communication performance with few FPGA slices. Moreover, the evaluation results in the liquid phantom experiment show that the FPGA-implemented UWB-IR receiver can achieve a bit error rate (BER) of 10(-3) up to a communication distance of 70 mm with ensuring a high data rate of 2 Mbps. PMID:25571602

Shimizu, Yuto; Anzai, Daisuke; Jianqing Wang

2014-01-01

304

Ultra-wideband microwave photonic phase shifter with a 360 tunable phase shift based on an erbium-ytterbium co-doped linearly chirped FBG.  

PubMed

A simple photonic approach to implementing an ultra-wideband microwave phase shifter based on an erbium-ytterbium (Er/Yb) co-doped linearly chirped fiber Bragg grating (LCFBG) is proposed and experimentally demonstrated. The LCFBG is designed to have a constant magnitude response over a reflection band, and a phase response that is linear and nonlinear in two sections in the reflection band. When an optical single-sideband with carrier (OSSB+C) signal is sent to the LCFBG, by locating the optical carrier at the section corresponding to the nonlinear phase response and the sideband at the section corresponding to the linear phase response, a phase shift is introduced to the optical carrier, which is then translated to the microwave signal by beating the optical carrier and the sideband at a photodetector. The tuning of the phase shift is realized by optically pumping the Er/Yb co-doped LCFBG by a 980-nm laser diode. The proposed ultra-wideband microwave photonic phase shifter is experimentally demonstrated. A phase shifter with a full 360 phase shift with a bandwidth from 10 to 40 GHz is experimentally demonstrated. PMID:24562242

Liu, Weilin; Yao, Jianping

2014-02-15

305

UWB-WBAN sensor node design.  

PubMed

In this paper, we discuss the hardware development of a UWB sensor node for wireless body area networks. A few unique UWB pulse generation techniques have been discussed. The sensor node transmits multiple pulses per bit to increase the average power of the transmitted signal in order to improve the bit-error rate (BER) performance. The multiple-pulse per bit technique is also used as the coding scheme to identify the individual sensor nodes when more than one sensor forms a network. The sensors nodes are able to transmit body signals up to 2 m with a BER lower than 10(-5). PMID:22254770

Keong, Ho Chee; Yuce, M R

2011-01-01

306

Abstract--Design of a fully differential sixth order GHz range gm-C lowpass filter for DS-CDMA UWB (ultra wideband)  

E-print Network

-amps with bandwidth in the range of tens of GHz. Transconductor capacitor (gm-C) filters are well suited method for building biquads is to design a highly linear transconductor and then implement the given transfer function using the transconductor. However, for achieving GHz range bandwidths, the complete

Ha, Dong S.

307

A progressive processing method for breast cancer detection via UWB based on an MRI-derived model  

NASA Astrophysics Data System (ADS)

Ultra-wideband (UWB) microwave imaging is a promising method for breast cancer detection based on the large contrast of electric parameters between the malignant tumor and its surrounded normal breast organisms. In the case of multiple tumors being present, the conventional imaging approaches may be ineffective to detect all the tumors clearly. In this paper, a progressive processing method is proposed for detecting more than one tumor. The method is divided into three stages: primary detection, refocusing and image optimization. To test the feasibility of the approach, a numerical breast model is developed based on the realistic magnetic resonance image (MRI). Two tumors are assumed embedded in different positions. Successful detection of a 3.6 mm-diameter tumor at a depth of 42 mm is achieved. The correct information of both tumors is shown in the reconstructed image, suggesting that the progressive processing method is promising for multi-tumor detection.

Xiao, Xia; Song, Hang; Wang, Zong-Jie; Wang, Liang

2014-07-01

308

A human body model for efficient numerical characterization of UWB signal propagation in wireless body area networks.  

PubMed

Wireless body area network (WBAN) is a new enabling system with promising applications in areas such as remote health monitoring and interpersonal communication. Reliable and optimum design of a WBAN system relies on a good understanding and in-depth studies of the wave propagation around a human body. However, the human body is a very complex structure and is computationally demanding to model. This paper aims to investigate the effects of the numerical model's structure complexity and feature details on the simulation results. Depending on the application, a simplified numerical model that meets desired simulation accuracy can be employed for efficient simulations. Measurements of ultra wideband (UWB) signal propagation along a human arm are performed and compared to the simulation results obtained with numerical arm models of different complexity levels. The influence of the arm shape and size, as well as tissue composition and complexity is investigated. PMID:21062677

Lim, Hooi Been; Baumann, Dirk; Li, Er-Ping

2011-03-01

309

An ultra-wideband CMOS LNA for 3.1 to 10.6 GHz wireless receivers  

Microsoft Academic Search

A UWB 3.1 to 10.6 GHz LNA employing an input three-section band-pass Chebyshev filter is reported. Fabricated in a 0.18 ?m CMOS process, -10 dB over the band, a NF of 4 dB, and an IIP3 of -6.7 dBm while consuming the IC achieves a power gain of 9.3 dB with an input match of 9 mW.

A. Bevilacqua; A. M. Niknejad

2004-01-01

310

Applications of UWB Technology  

E-print Network

Recent advances in wideband impulse technology, low power communication along with unlicensed band have enabled ultra wide band (UWB) as a leading technology for future wireless applications. This paper outlines the applications of emerging UWB technology in a private and commercial sector. We further talk about UWB technology for a wireless body area network (WBAN).

Ullah, Sana; Hussain, Asdaque; Kwak, Kyung Sup

2009-01-01

311

Design of UWB monopole antenna with dual notched bands using one modified electromagnetic-bandgap structure.  

PubMed

A modified electromagnetic-bandgap (M-EBG) structure and its application to planar monopole ultra-wideband (UWB) antenna are presented. The proposed M-EBG which comprises two strip patch and an edge-located via can perform dual notched bands. By properly designing and placing strip patch near the feedline, the proposed M-EBG not only possesses a simple structure and compact size but also exhibits good band rejection. Moreover, it is easy to tune the dual notched bands by altering the dimensions of the M-EBG. A demonstration antenna with dual band-notched characteristics is designed and fabricated to validate the proposed method. The results show that the proposed antenna can satisfy the requirements of VSWR < 2 over UWB 3.1-10.6?GHz, except for the rejected bands of the world interoperability for microwave access (WiMAX) and the wireless local area network (WLAN) at 3.5?GHz and 5.5?GHz, respectively. PMID:24170984

Liu, Hao; Xu, Ziqiang

2013-01-01

312

A Novel Compact UWB Monopole Antenna with Bluetooth and Triple Notch Band  

NASA Astrophysics Data System (ADS)

A novel technique to add an extra Bluetooth band and triple notch bands simultaneously to a compact ultra-wideband (UWB) monopole antenna is presented. This scissors-shaped UWB antenna, covering 2.9 GHz-12.5 GHz, is fed by a special microstrip line. To create an extra Bluetooth band centered at 2.45 GHz, an arc-shaped stub is attached to the high concentrated current area right of the feed line and a rectangular slot is etched in the radiation patch. Besides, a notch band for WLAN (5.6 GHz-6.15 GHz) is also obtained. In addition, by connecting two asymmetric stubs to the feed line, two other notch bands in 3.28 GHz-3.8 GHz for WiMAX and 7.1 GHz-7.76 GHz for downlink of X-band satellite communication systems are achieved. The proposed antenna with compact size of 20 mm 26 mm is fabricated and measured, showing stable antenna gain and good omni-directional radiation patterns in H-plane.

Li, Li; Zhou, Zhi-Li; Hong, Jing-Song

2013-01-01

313

Low-power wide-locking-range injection-locked frequency divider for OFDM UWB systems  

NASA Astrophysics Data System (ADS)

This paper describes a divide-by-two injection-locked frequency divider (ILFD) for frequency synthesizers as used in multiband orthogonal frequency division multiplexing (OFDM) ultra-wideband (UWB) systems. By means of dual-injection technique and other conventional tuning techniques, such as DCCA and varactor tuning, the divider demonstrates a wide locking range while consuming much less power. The chip was fabricated in the Jazz 0.18 ?m RF CMOS process. The measurement results show that the divider achieves a locking range of 4.85 GHz (6.23 to 11.08 GHz) at an input power of 8 dBm. The core circuit without the test buffer consumes only 3.7 mA from a 1.8 V power supply and has a die area of 0.38 0.28 mm2. The wide locking range combined with low power consumption makes the ILFD suitable for its application in UWB systems.

Jiangwei, Yin; Ning, Li; Renliang, Zheng; Wei, Li; Junyan, Ren

2009-05-01

314

Design of UWB Monopole Antenna with Dual Notched Bands Using One Modified Electromagnetic-Bandgap Structure  

PubMed Central

A modified electromagnetic-bandgap (M-EBG) structure and its application to planar monopole ultra-wideband (UWB) antenna are presented. The proposed M-EBG which comprises two strip patch and an edge-located via can perform dual notched bands. By properly designing and placing strip patch near the feedline, the proposed M-EBG not only possesses a simple structure and compact size but also exhibits good band rejection. Moreover, it is easy to tune the dual notched bands by altering the dimensions of the M-EBG. A demonstration antenna with dual band-notched characteristics is designed and fabricated to validate the proposed method. The results show that the proposed antenna can satisfy the requirements of VSWR < 2 over UWB 3.110.6?GHz, except for the rejected bands of the world interoperability for microwave access (WiMAX) and the wireless local area network (WLAN) at 3.5?GHz and 5.5?GHz, respectively. PMID:24170984

Xu, Ziqiang

2013-01-01

315

UWB Double polarised phased array  

Microsoft Academic Search

A systematic approach for the design of an ultra wideband (4-18 GHz) radiating element in dual polarized planar phased-array application is presented. Two different radiating elements have been selected: the Vivaldi notch element, fed by strip-line, and the four arms Sinuous element, fed by ultra wide band double printed balun. Return loss, gain and patterns have been simulated and optimized

P. Baldonero; A. Manna; F. Trotta; A. Pantano; M. Bartocci

2009-01-01

316

A 128-channel 6 mW wireless neural recording IC with spike feature extraction and UWB transmitter.  

PubMed

This paper reports a 128-channel neural recording integrated circuit (IC) with on-the-fly spike feature extraction and wireless telemetry. The chip consists of eight 16-channel front-end recording blocks, spike detection and feature extraction digital signal processor (DSP), ultra wideband (UWB) transmitter, and on-chip bias generators. Each recording channel has amplifiers with programmable gain and bandwidth to accommodate different types of biological signals. An analog-to-digital converter (ADC) shared by 16 amplifiers through time-multiplexing results in a balanced trade-off between the power consumption and chip area. A nonlinear energy operator (NEO) based spike detector is implemented for identifying spikes, which are further processed by a digital frequency-shaping filter. The computationally efficient spike detection and feature extraction algorithms attribute to an auspicious DSP implementation on-chip. UWB telemetry is designed to wirelessly transfer raw data from 128 recording channels at a data rate of 90 Mbit/s. The chip is realized in 0.35 mum complementary metal-oxide-semiconductor (CMOS) process with an area of 8.8 x 7.2 mm(2) and consumes 6 mW by employing a sequential turn-on architecture that selectively powers off idle analog circuit blocks. The chip has been tested for electrical specifications and verified in an ex vivo biological environment. PMID:19435684

Chae, Moo Sung; Yang, Zhi; Yuce, Mehmet R; Hoang, Linh; Liu, Wentai

2009-08-01

317

A CPW-Fed Circular Wide-Slot UWB Antenna with Wide Tunable and Flexible Reconfigurable Dual Notch Bands  

PubMed Central

A coplanar waveguide (CPW)-fed circular slot antenna with wide tunable dual band-notched function and frequency reconfigurable characteristic is designed, and its performance is verified experimentally for ultra-wideband (UWB) communication applications. The dual band-notched function is achieved by using a T-shaped stepped impedance resonator (T-SIR) inserted inside the circular ring radiation patch and by etching a parallel stub loaded resonator (PSLR) in the CPW transmission line, while the wide tunable bands can be implemented by adjusting the dimensions of the T-SIR and the PSLR. The notch band reconfigurable characteristic is realized by integrating three switches into the T-SIR and the PSLR. The numerical and experimental results show that the proposed antenna has a wide bandwidth ranging from 2.7?GHz to 12?GHz with voltage standing wave ratio (VSWR) less than 2, except for the two notch bands operating at 3.85.9?GHz and 7.79.2?GHz, respectively. In addition, the proposed antenna has been optimized to a compact size and can provide omnidirectional radiation patterns, which are suitable for UWB communication applications. PMID:24222733

Li, Yingsong; Li, Wenxing; Ye, Qiubo

2013-01-01

318

Design and development of ultra-wideband 3 dB hybrid coupler for Ion cyclotron resonance frequency heating in tokamak.  

PubMed

Design and development of a high power ultra-wideband, 3 dB tandem hybrid coupler is presented and its application in ICRF heating of the tokamak is discussed. In order to achieve the desired frequency band of 38-112 MHz and 200 kW power handling capability, the 3 dB hybrid coupler is developed using two 3-element 8.34 0.2 dB coupled lines sections in tandem. In multi-element coupled lines, junctions are employed for the joining of coupled elements that produce the undesirable reactance called junction discontinuity effect. The effect becomes prominent in the high power multi-element coupled lines for high frequency (HF) and very high frequency(VHF) applications because of larger structural dimensions. Junction discontinuity effect significantly deteriorates coupling and output performance from the theoretical predictions. For the analysis of junction discontinuity effect and its compensation, a theoretical approach has been developed and generalized for n-element coupled lines section. The theory has been applied in the development of the 3 dB hybrid coupler. The fabricated hybrid coupler has been experimentally characterized using vector network analyzer and obtained results are found in good agreement with developed theory. PMID:24784637

Yadav, Rana Pratap; Kumar, Sunil; Kulkarni, S V

2014-04-01

319

A framework for simulation of UWB system for heart rate detection  

Microsoft Academic Search

Ultra-Wide Band (UWB) signals have become attractive for their particular advantage of having narrow pulse width which makes them suitable for remote sensing of vital signals. In this work, a MATLAB framework is presented which simulates an environment whereby the UWB signals can be observed and evaluated at different locations of the simulated channel for wireless measurement of heart rate.

Mehran Baboli; Azadeh Sharafi; Alireza Ahmadian; Saeed KarimiFard

2009-01-01

320

A new wavelet based algorithm for estimating respiratory motion rate using UWB radar  

Microsoft Academic Search

UWB signals have become attractive for their particular advantage of having narrow pulse width which makes them suitable for remote sensing of vital signals. In this paper a novel approach to estimate periodic motion rates, using ultra wide band (UWB) signals is proposed. The proposed algorithm which is based on wavelet transform is used as a non-contact tool for measurement

Mehran Baboli; Seyed Ali Ghorashi; Namdar Saniei; Alireza Ahmadian

2009-01-01

321

Time-lapse imaging of human heart motion with switched array UWB radar.  

PubMed

Radar systems for detection of human heartbeats have mostly been single-channel systems with limited spatial resolution. In this paper, a radar system for ultra-wideband (UWB) imaging of the human heart is presented. To make the radar waves penetrate the human tissue the antenna is placed very close to the body. The antenna is an array with eight elements, and an antenna switch system connects the radar to the individual elements in sequence to form an image. Successive images are used to build up time-lapse movies of the beating heart. Measurements on a human test subject are presented and the heart motion is estimated at different locations inside the body. The movies show rhythmic motion consistent with the beating heart, and the location and shape of the reflections correspond well with the expected response form the heart wall. The spatial dependent heart motion is compared to ECG recordings, and it is confirmed that heartbeat modulations are seen in the radar data. This work shows that radar imaging of the human heart may provide valuable information on the mechanical movement of the heart. PMID:25350945

Brovoll, Sverre; Berger, Tor; Paichard, Yoann; Aardal, 貀vind; Lande, Tor Sverre; Hamran, Svein-Erik

2014-10-01

322

A Multiuser Detector Based on Artificial Bee Colony Algorithm for DS-UWB Systems  

PubMed Central

Artificial Bee Colony (ABC) algorithm is an optimization algorithm based on the intelligent behavior of honey bee swarm. The ABC algorithm was developed to solve optimizing numerical problems and revealed premising results in processing time and solution quality. In ABC, a colony of artificial bees search for rich artificial food sources; the optimizing numerical problems are converted to the problem of finding the best parameter which minimizes an objective function. Then, the artificial bees randomly discover a population of initial solutions and then iteratively improve them by employing the behavior: moving towards better solutions by means of a neighbor search mechanism while abandoning poor solutions. In this paper, an efficient multiuser detector based on a suboptimal code mapping multiuser detector and artificial bee colony algorithm (SCM-ABC-MUD) is proposed and implemented in direct-sequence ultra-wideband (DS-UWB) systems under the additive white Gaussian noise (AWGN) channel. The simulation results demonstrate that the BER and the near-far effect resistance performances of this proposed algorithm are quite close to those of the optimum multiuser detector (OMD) while its computational complexity is much lower than that of OMD. Furthermore, the BER performance of SCM-ABC-MUD is not sensitive to the number of active users and can obtain a large system capacity. PMID:23983638

Liu, Xiaohui

2013-01-01

323

Space-Time Codes for MIMO Ultra-Wideband Communications and MIMO Free-Space Optical Communications with PPM  

Microsoft Academic Search

In this paper, we consider the problem of Space- Time (ST) coding with Pulse Position Modulation (PPM). While all the existing ST block codes necessitate rotating the phase or amplifying the amplitude of the transmitted symbols, the pro- posed scheme can be associated with unipolar PPM constellations without introducing any additional constellation extension. In other words, full transmit diversity can

Chadi Abou-rjeily; Wissam Fawaz

2008-01-01

324

Experimental results for a photonic time reversal processor for the adaptive control of an ultra wideband phased array antenna  

NASA Astrophysics Data System (ADS)

This paper describes a new concept for a photonic implementation of a time reversed RF antenna array beamforming system. The process does not require analog to digital conversion to implement and is therefore particularly suited for high bandwidth applications. Significantly, propagation distortion due to atmospheric effects, clutter, etc. is automatically accounted for with the time reversal process. The approach utilizes the reflection of an initial interrogation signal from off an extended target to precisely time match the radiating elements of the array so as to re-radiate signals precisely back to the target's location. The backscattered signal(s) from the desired location is captured by each antenna and used to modulate a pulsed laser. An electrooptic switch acts as a time gate to eliminate any unwanted signals such as those reflected from other targets whose range is different from that of the desired location resulting in a spatial null at that location. A chromatic dispersion processor is used to extract the exact array parameters of the received signal location. Hence, other than an approximate knowledge of the steering direction needed only to approximately establish the time gating, no knowledge of the target position is required, and hence no knowledge of the array element time delay is required. Target motion and/or array element jitter is automatically accounted for. Presented here are experimental results that demonstrate the ability of a photonic processor to perform the time-reversal operation on ultra-short electronic pulses.

Zmuda, Henry; Fanto, Michael; McEwen, Thomas

2008-04-01

325

Feasibility Study and Design of a Wearable System-on-a-Chip Pulse Radar for Contactless Cardiopulmonary Monitoring  

PubMed Central

A new system-on-a-chip radar sensor for next-generation wearable wireless interface applied to the human health care and safeguard is presented. The system overview is provided and the feasibility study of the radar sensor is presented. In detail, the overall system consists of a radar sensor for detecting the heart and breath rates and a low-power IEEE 802.15.4 ZigBee radio interface, which provides a wireless data link with remote data acquisition and control units. In particular, the pulse radar exploits 3.110.6 GHz ultra-wideband signals which allow a significant reduction of the transceiver complexity and then of its power consumption. The operating principle of the radar for the cardiopulmonary monitoring is highlighted and the results of the system analysis are reported. Moreover, the results obtained from the building-blocks design, the channel measurement, and the ultra-wideband antenna realization are reported. PMID:18389068

Zito, Domenico; Pepe, Domenico; Neri, Bruno; Zito, Fabio; De Rossi, Danilo; Lanat, Antonio

2008-01-01

326

UWB channel estimation using new generating TR transceivers  

DOEpatents

The present invention presents a simple and novel channel estimation scheme for UWB communication systems. As disclosed herein, the present invention maximizes the extraction of information by incorporating a new generation of transmitted-reference (Tr) transceivers that utilize a single reference pulse(s) or a preamble of reference pulses to provide improved channel estimation while offering higher Bit Error Rate (BER) performance and data rates without diluting the transmitter power.

Nekoogar, Faranak (San Ramon, CA); Dowla, Farid U. (Castro Valley, CA); Spiridon, Alex (Palo Alto, CA); Haugen, Peter C. (Livermore, CA); Benzel, Dave M. (Livermore, CA)

2011-06-28

327

SEMICONDUCTOR INTEGRATED CIRCUITS: A low jitter, low spur multiphase phase-locked loop for an IR-UWB receiver  

NASA Astrophysics Data System (ADS)

A low jitter, low spur multiphase phase-locked loop (PLL) for an impulse radio ultra-wideband (IR-UWB) receiver is presented. The PLL is based on a ring oscillator in order to simultaneously meet the jitter requirement, low power consumption and multiphase clock output. In this design, a noise and matching improved voltage-controlled oscillator (VCO) is devised to enhance the timing accuracy and phase noise performance of multiphase clocks. By good matching achieved in the charge pump and careful choice of the loop filter bandwidth, the reference spur is suppressed. A phase noise of -118.42 dBc/Hz at a frequency offset of 1 MHz, RMS jitter of 1.53 ps and reference spur of -66.81 dBc are achieved at a carrier frequency of 264 MHz in measurement. The chip was manufactured in 0.13 ?m CMOS technology and consumes 4.23 mW from a 1.2 V supply while occupying 0.14 mm2 area.

Ke, Shao; Hu, Chen; Yaohua, Pan; Zhiliang, Hong

2010-08-01

328

Predicting the breakdown behavior of microcontrollers under EMP\\/UWB impact using a statistical analysis  

Microsoft Academic Search

Reproducible prediction of damaging effects is one of the main problems in intentional electromagnetic interference (IEMI). In this paper, the susceptibility of different types of single microcontrollers to unipolar fast rise time pulses [electromagnetic pulse (EMP), ultrawide band (UWB)] is determined. Therefore, pulses with rise times as fast as 100 ps and electric field amplitudes of up to 100 kV\\/m

Michael Camp; Hendrik Gerth; Heyno Garbe; Helmut Haase

2004-01-01

329

47 CFR 15.521 - Technical requirements applicable to all UWB devices.  

Code of Federal Regulations, 2012 CFR

...long compared to the nominal pulse repetition interval, measurements shall be made with the pulse train gated on. Alternative...within the UWB device. For measuring emission levels, the spectrum...a) or up to fC + 3/(pulse width in seconds),...

2012-10-01

330

47 CFR 15.521 - Technical requirements applicable to all UWB devices.  

Code of Federal Regulations, 2014 CFR

...long compared to the nominal pulse repetition interval, measurements shall be made with the pulse train gated on. Alternative...within the UWB device. For measuring emission levels, the spectrum...a) or up to fC + 3/(pulse width in seconds),...

2014-10-01

331

47 CFR 15.521 - Technical requirements applicable to all UWB devices.  

Code of Federal Regulations, 2011 CFR

...long compared to the nominal pulse repetition interval, measurements shall be made with the pulse train gated on. Alternative...within the UWB device. For measuring emission levels, the spectrum...a) or up to fC + 3/(pulse width in seconds),...

2011-10-01

332

47 CFR 15.521 - Technical requirements applicable to all UWB devices.  

Code of Federal Regulations, 2013 CFR

...long compared to the nominal pulse repetition interval, measurements shall be made with the pulse train gated on. Alternative...within the UWB device. For measuring emission levels, the spectrum...a) or up to fC + 3/(pulse width in seconds),...

2013-10-01

333

Note on antenna design in UWB wireless communication systems  

Microsoft Academic Search

Requirements for the antennas in wireless communication systems are presented, from a systems point of view. Differences between narrowband and ultrawideband systems in assessing system performance are discussed. Several parameters are introduced for the antennas in ultra-wideband wireless communication systems, to evaluate the performance of antennas based on the system requirements. As an example, a transmitting\\/receiving antenna system comprising two

Xuan Hui Wu; Zhi Ning Chen; M. Y. W. Chia

2003-01-01

334

Aspects of ultrafast spark gap switching UWB HPM generation  

Microsoft Academic Search

The Air Force is interested in compact ultra-wideband systems which utilize a minimum volume of high pressure gas. These desires lead us to look closely at single channel spark gaps, because both the size and volume of gas, for example, hydrogen, under pressure can be much less than needed for sources containing ring gap switches. White single channel spark gap

J. M. Lehr; C. E. Baum; W. D. Prather; F. J. Agee

1997-01-01

335

Dynamics of Continuous, Discrete, and Impulse Systems, Special issue on "Ultra-Wideband Wireless Communications", Vol. 12, No. 3, June 2005 pp. 297-482, ISSN 1492-8760.  

E-print Network

, there would be no controlled wireless propagation of electromagnetic waves. Without an understanding point of view, this understanding may be the most significant milestone in the UWB communication history

Qiu, Robert Caiming

336

47 CFR 15.507 - Marketing of UWB equipment.  

Code of Federal Regulations, 2010 CFR

... 2010-10-01 false Marketing of UWB equipment. 15...Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL RADIO...Operation 15.507 Marketing of UWB equipment...or local government. The marketing of UWB devices must...

2010-10-01

337

Frequency and Time-Domain Performance of Four-Arm Mode2 Spiral Antennas  

Microsoft Academic Search

The performance of simply-fed four-arm Archimedean and equiangular spiral antennas operating in mode-2 (conical beam) and their suitability for pulsed communication applications are investigated. The frequency-domain transfer function of spiral antennas-based ultra-wideband (UWB) link is synthesized using complex far field information measured in a spherical near-field chamber from 2 to 12 GHz. The time-domain performance is obtained by post-processing frequency-domain

Mohamed A. Elmansouri; Matthew J. Radway; Dejan S. Filipovic

2012-01-01

338

Characteristics of trap-filled gallium arsenide photoconductive switches used in high gain pulsed power applications  

SciTech Connect

The electrical properties of semi-insulating (SI) Gallium Arsenide (GaAs) have been investigated for some time, particularly for its application as a substrate in microelectronics. Of late this material has found a variety of applications other than as an isolation region between devices, or the substrate of an active device. High resistivity SI GaAs is increasingly being used in charged particle detectors and photoconductive semiconductor switches (PCSS). PCSS made from these materials operating in both the linear and non-linear modes have applications such as firing sets, as drivers for lasers, and in high impedance, low current Q-switches or Pockels cells. In the non-linear mode, it has also been used in a system to generate Ultra-Wideband (UWB) High Power Microwaves (HPM). The choice of GaAs over silicon offers the advantage that its material properties allow for fast, repetitive switching action. Furthermore photoconductive switches have advantages over conventional switches such as improved jitter, better impedance matching, compact size, and in some cases, lower laser energy requirement for switching action. The rise time of the PCSS is an important parameter that affects the maximum energy transferred to the load and it depends, in addition to other parameters, on the bias or the average field across the switch. High field operation has been an important goal in PCSS research. Due to surface flashover or premature material breakdown at higher voltages, most PCSS, especially those used in high power operation, need to operate well below the inherent breakdown voltage of the material. The lifetime or the total number of switching operations before breakdown, is another important switch parameter that needs to be considered for operation at high bias conditions. A lifetime of {approximately} 10{sup 4} shots has been reported for PCSS's used in UWB-HPM generation [5], while it has exceeded 10{sup 8} shots for electro-optic drivers. Much effort is currently being channeled in the study related to improvements of these two parameters high bias operation and lifetime improvement for switches used in pulsed power applications. The contact material and profiles are another important area of study. Although these problems are being pursued through the incorporation of different contact materials and introducing doping near contacts, it is important that the switch properties and the conduction mechanism in these switches be well understood such that the basic nature of the problems can be properly addressed. In this paper the authors report on these two basic issues related to the device operation, i.e., mechanisms for increasing the hold-off characteristics through neutron irradiation, and the analysis of transport processes at varying field conditions in trap dominated SI GaAs in order to identify the breakdown mechanism during device operation. It is expected that this study would result in a better understanding of photoconductive switches, specifically those used in high power operation.

ISLAM,N.E.; SCHAMILOGLU,E.; MAR,ALAN; LOUBRIEL,GUILLERMO M.; ZUTAVERN,FRED J.; JOSHI,R.P.

2000-05-30

339

Conformal double exponentially tapered slot antenna (DETSA) on LCP for UWB applications  

Microsoft Academic Search

We discuss the use of a double exponentially tapered slot antenna (DETSA) fabricated on flexible liquid crystal polymer (LCP) as a candidate for ultrawideband (UWB) communications systems. The features of the antenna and the effect of the antenna on a transmitted pulse are investigated. Return loss and E and H plane radiation pattern measurements are presented in several frequencies covering

Symeon Nikolaou; George E. Ponchak; John Papapolymerou; Manos M. Tentzeris

2006-01-01

340

Textile UWB Antennas for Wireless Body Area Networks  

Microsoft Academic Search

A new ultrawideband (UWB) textile antenna designed for UWB wireless body area network (WBAN) applications is presented. Unlike previous textile antennas, these antennas offer a direct integration into clothing due to a very small thickness (0.5 mm) and flexibility. We have realized two different designs of textile antennas: coplanar waveguide fed printed UWB disc monopole and UWB annular slot antenna.

Maciej Klemm; Gerhard Troester

2006-01-01

341

Implementation of UWB MIMO Time-reversal Radio Testbed  

E-print Network

of localization. One central issue facing UWB community is to effectively collect energy that is dispersed among the way for experimental research in UWB communications, UWB imaging, remote sensing and physical security communication and sensing applications [1] [2] [3]. Combing UWB transmission with MIMO could overcome the power

Qiu, Robert Caiming

342

A DS-UWB Cognitive Radio System Based on Bridge Function Smart Codes  

NASA Astrophysics Data System (ADS)

This paper proposes a direct-sequence UWB Gaussian pulse of cognitive radio systems based on bridge function smart sequence matrix and the Gaussian pulse. As the system uses the spreading sequence code, that is the bridge function smart code sequence, the zero correlation zones (ZCZs) which the bridge function sequences' auto-correlation functions had, could reduce multipath fading of the pulse interference. The Modulated channel signal was sent into the IEEE 802.15.3a UWB channel. We analysis the ZCZs's inhibition to the interference multipath interference (MPI), as one of the main system sources interferences. The simulation in SIMULINK/MATLAB is described in detail. The result shows the system has better performance by comparison with that employing Walsh sequence square matrix, and it was verified by the formula in principle.

Xu, Yafei; Hong, Sheng; Zhao, Guodong; Zhang, Fengyuan; di, Jinshan; Zhang, Qishan

343

Coarse synchronization of UWB signals in the dense multipath channel based on the golden section  

Microsoft Academic Search

In this paper we address the problem of coarse synchronization of ultra wideband signals in the dense multipath channel, following the widely used hypothesis testing approach in which the uncertainty region for the timing offset is divided into a certain number of cells. We propose a novel strategy for the search of the correct cells, within the constant increment perspective.

Eva Arias-de-Reyna; Jos I. Acha-Catalina

2007-01-01

344

Pulse  

MedlinePLUS

... the pulse rate can help determine if the patient's heart is pumping. Pulse measurement has other uses as well. During or immediately after exercise, the pulse rate gives information about your fitness ...

345

ULTRA WIDEBAND FRACTAL MICROSTRIP ANTENNA DESIGN  

Microsoft Academic Search

Abstract桸ewfractal geometry for microstrip antennas is presented in this paper. This fractal structure is implemented on hexagonal and,several iteration is applied on initial shape.,This antenna has lowprofile, lightw eight and is easy to be fabricated and has successfully demonstrated multiband and broadband characteristics. The simulated results showthat proposed antenna has very good performance in impedance bandwidth and radiation pattern.

Abolfazl Azari; Javad Rowhani

2008-01-01

346

Ultra wideband antenna design for implant applications  

Microsoft Academic Search

Wireless telemetry based secure communication has been extensively worked to improve the life quality of patients having heart problems, diabetic problems and so on. Information of appropriate biosensors could be transferred via implant antennas to which, there are a growing research interests. In the scope of this work, we have designed a wide band antenna for biotelemetry communication. Radiation diagram,

F. Zengin; B. Turetken; E. Akkaya; S. E. San

2010-01-01

347

A deterministic ultra wideband channel modeling  

Microsoft Academic Search

We study the realisation of a deterministic channel modeling which allows the construction of a realistic received waveform from a wireless spread spectrum multiple-access (SSMA) using time hopping (TH) modulation. The goal is to reach the symbol decision from a simulated waveform. This paper explains how to use the uniform theory of diffraction (UTD) method combined with a ray tracing

Bernard Uguen; Eric Plouhinec; Yves Lostanlen; G. Chassay

2002-01-01

348

Performance analysis of various UWB radar approaches for medical diagnostics  

Microsoft Academic Search

In this paper, the challenge of the UWB radar for medical applications is presented in terms of high signal attenuation and multiple reflections in human tissues. Different UWB radar approaches are reviewed in this research. The IR- UWB approaches, the PN approach and the frequency measurement with the Vector Network Analyzer are introduced and discussed. Furthermore, the demonstrators of all

Xuyang Li; Steffen Scherr; Leen Sit; Elena Pancera; Thomas Zwick

2011-01-01

349

Low-power UWB transmitter using a combined mixer and power amplifier  

Microsoft Academic Search

This paper presents an energy-efficient transmitter for UWB impulse-radio. The proposed circuit uses a novel combined mixer and power amplifier to generate a Gaussian pulse with 1.25GHz bandwidth and center frequency of 7.87GHz. The combined MXR-PA includes a monolithic transformer to reach a maximum output voltage swing of 3.2Vpp. The transformer has been designed so as to maximize the transmitter

Silvia Sold; M. Caruso; Daniele Vogrig; Andrea Bevilacqua; Andrea Gerosa; Andrea Neviani

2010-01-01

350

Non-Invasive UWB Sensing of Astronauts' Breathing Activity  

PubMed Central

The use of a UWB system for sensing breathing activity of astronauts must account for many critical issues specific to the space environment. The aim of this paper is twofold. The first concerns the definition of design constraints about the pulse amplitude and waveform to transmit, as well as the immunity requirements of the receiver. The second issue concerns the assessment of the procedures and the characteristics of the algorithms to use for signal processing to retrieve the breathing frequency and respiration waveform. The algorithm has to work correctly in the presence of surrounding electromagnetic noise due to other sources in the environment. The highly reflecting walls increase the difficulty of the problem and the hostile scenario has to be accurately characterized. Examples of signal processing techniques able to recover breathing frequency in significant and realistic situations are shown and discussed. PMID:25558995

Baldi, Marco; Cerri, Graziano; Chiaraluce, Franco; Eusebi, Lorenzo; Russo, Paola

2015-01-01

351

Pulse sharpening and soliton generation with nonlinear transmission lines for producing RF bursts  

Microsoft Academic Search

Nonlinear transmission lines (NLTL) are being designed and built to extend the range of available Ultra- Wide Band (UWB) and High Power RF pulse generation technology, especially in the area of high repetition rate microwave burst generation (1). The NLTL approach to UWB and RF generation eliminates the need for the electron beam, vacuum system, and magnets required in conventional

Jason M. Sanders; Yung-Hsu Lin; Richard Ness; Andras Kuthi; Martin Gundersen

2010-01-01

352

UWB Radio Propagation Inside Vehicle Environments  

Microsoft Academic Search

This is the first study for inside vehicle wireless communication system design with UWB technology under WiMedia standard. At first, MATLAB simulator has been developed then calculated BER in AWGR channel model. And it is confirmed adequacy of channel model compared with IEEE simulation model. And wireless transmission characteristics are measured with the following? conditions such as receiver on top

T. Tsuboi; J. Yamada; N. Yamauchi

2007-01-01

353

Miniature UWB Antenna with Embedded Inductive Loading  

Microsoft Academic Search

Many commercial and military applications require small low profile UWB antennas that operate from 50 MHz to 2000 MHz. Using conventional designs to cover such a vast frequency range with a single antenna would require an aperture size and profile which are too large for practical applications. Antenna miniaturization techniques such as dielectric [1, 2] or reactive loading [3, 4

Brad A. Kramer; Ming Lee; Chi-Chih Chen; John L. Volakis

2006-01-01

354

Compact antennas for UWB applications  

Microsoft Academic Search

A report on an investigation of spherical, disc, and half-disc antennas in the frequency and time domains with the objective of developing small planar versions of the antennas. These antennas have an omni-directional impulse response in azimuth and pulse duration of 0.5-0.65 nanoseconds. In addition, the measured data show a reasonable peak received signal in a pulse communication link using

Taeyoung Yang; Seong-Youp Suh; Randall Nealy; William A. Davis; Warren L. Stutzman

2004-01-01

355

Test Research on UWB Effects and Mechanism of Radio Fuze  

Microsoft Academic Search

This research indicates that the fuze's EED itself and the nonworking status fuze are safe in the radiation of UWB. Because of the SCR (silicon controlled rectifier) in fuze mistakenly turning from off status to on status, the fuzes under test all explode when the peak-peak E-field of the UWB is 106 kV\\/m

Wang Shao-guang; Wei Guang-hui; Liu Hong-bo

2006-01-01

356

Tremor Acquisition System Based on UWB Wireless Sensor Network  

Microsoft Academic Search

This work suggests to quantify and analyze tremorusing an Ultra Wide-Band (UWB) Wireless Sensor Network(WSN). WSN based on UWB technology provides a new technology for non contact tremor assessment with extremely low radiation and penetration through walls. Tremor is the target symptom in the treatment of many neurological disorders such as Parkinson's disease (PD), midbrain tremor, essential tremor (ET) and

Gaddi Blumrosen; Moshe Uziel; Boris Rubinsky; Dana Porrat

2010-01-01

357

Impulse arrays  

NASA Astrophysics Data System (ADS)

This report considers impulse radar signals in terms of their propagation from an array of elements. The far-field electric vector is proportional to the derivative of the current in an infinitesimal dipole representing each element. Although not physically realizable, this model is used as an approximation to illustrate some array properties peculiar to impulse, or ultra-wideband (UWB), excitations. Thus, for example, a 1-ns rounded baseband pulse with a cosine-squared shape theoretically propagates as a single sinusoidal cycle centered at L-band (1 GHz) with 100 percent bandwidth. The far field from an array of elements is considered as a function of angle.

Temes, C. L.

1991-05-01

358

Compact antennas for UWB applications  

Microsoft Academic Search

This paper reports on an investigation of spherical, disc, and half-disc antennas in the frequency and time domains with the objective of developing small planar versions of the antennas. These antennas have an omni-directional impulse response in azimuth and a pulse duration of 0.5 - 0.65 nanoseconds. In addition, the measured data show a reasonable peak received signal in a

Taeyoung Yang; Seong-Youp Suh; Randall Nealy; William A. Davis; Warren L. Stutzman

2003-01-01

359

An experimental UWB module-based sensing and communication system  

Microsoft Academic Search

An experimental UWB system is developed, designed, prototyped and tested to support a number of multitask sensing and telecommunication applications in the 0.1-3.0 GHz band, viz. subsurface radar or GPR, intrusion sensor, \\

D. L. Sostanovsky; A. O. Boryssenko

2004-01-01

360

Effect of uncoordinated network interference on UWB autocorrelation receiver  

Microsoft Academic Search

Over the last few years there has been an emerging interest in ultrawideband (UWB) communications in wireless sensor networks, mainly due to their low-complexity and low-power consumption. In particular, auto-correlation receiver (AcR) is a potential candidate for such applications. However, the presence of network interference, especially interference between uncoordinated UWB networks, will severely degrade the performance of such receiver. In

Alberto Rabbachin; Tony Q. S. Quek; Ian Oppermann; Moe Z. Win

2009-01-01

361

Using FDTD approach in modeling UWB radiowave propagation and objects detection behind walls  

NASA Astrophysics Data System (ADS)

A Numerical Electromagnetic approach known as FDTD is used to model and predict Electromagnetic field everywhere in the region of interest and to discern objects behind the wall. In this study, a 2D-TE case is being investigated. Real time total EM field due to a stimulus of UWB pulse - a modulated Gaussian Pulse is calculated and analyzed. RMSE (Root Mean Square Error) approach is taken to discern objects based on their characteristics such as geometry, dielectric constant epsilon, and electrical conductivity sigma. Since every human body is unique, the collected data on the scattered field can be compared with standard scattering model stored in the computer data base to narrow down the detected object belong to certain categories, and thus finally be identified such as a military personnel in the battlefield; an individual in a high security area. Other applications are monitoring of infants, patients, or pets in room next to the one where transmitters and receivers are located.

Lee, Peter Y.

362

STUDY INTO THE POTENTIAL OF UWB APPLICATIONS IN THE PROCESS INDUSTRY  

E-print Network

STUDY INTO THE POTENTIAL OF UWB APPLICATIONS IN THE PROCESS INDUSTRY Kar, Elisabeth A.M. van de wideband (UWB), enable the use of advanced applications in the process industry. The main challenge in the first phase of designing UWB networks and applications is getting to know what the process industry, i

Langendoen, Koen

363

A 1 nJ\\/b 3.2-to-4.7 GHz UWB 50 Mpulses\\/s double quadrature receiver for communication and localization  

Microsoft Academic Search

This paper describes the integration in a 0.13 ?m CMOS of an Ultra Wide Band (UWB) receiver for communication and localization. It operates in the whole 3.2-to-4.7 GHz band of the IEEE.802.15.4a regulation mask. The proposed double quadrature coherent architecture allows exploiting high resolution capability of short pulses in the time domain, with a low sampling clock at 50 MHz.

Gilles Masson; Dominique Morche; H閘鑞e Jacquinot; Pierre Vincent; Fran鏾is Dehmas; St閜hane Paquelet; Alexis Bisiaux; Olivier Fourquin; Jean Gaubert; Sylvain Bourdel

2010-01-01

364

Throughput of optimal and suboptimal low-power IR-UWB coherent receivers for wireless body-area-networks (WBANs)  

Microsoft Academic Search

Impulse radio ultra wide band (IR-UWB) systems have the potential for low-power consumption as well as high data-rates over short distances. This makes them an attractive candidate for emerging wireless body-area-network (BAN) applications. In this paper, we investigate the performance of low-power suboptimal real sinusoidal-template based detectors for M-ary pulseamplitude-modulation (PAM) and M-ary equally-correlated pulse-position-modulation M-ary (EC-PPM) modulation techniques in

Heba Shaban; M. Abou El-Nasr; R. M. Buehrer

2011-01-01

365

A compact, low jitter, fast rise time, gas-switched pulse generator system with high pulse repetition rate capability  

Microsoft Academic Search

We present the experimental results of an ongoing research effort focused on the development and refinement of a compact, low jitter, fast rise time, command triggered, high peak power, high pulse repetition rate (PRR), gas-switched pulse generator system. The main component of the system is a gas-switched Marx-like pulse generator module designed for applications including UWB radar, microwave sources, and

Ronald J. Focia; Charles A. Frost

2009-01-01

366

A Compact, Low Jitter, Fast Rise Time, Gas-Switched Pulse Generator System with High Pulse Repetition Rate Capability  

Microsoft Academic Search

Summary form only given. We present the experimental results of a research effort focused on development and refinement of a compact, low jitter, fast rise time, command triggered, high peak power, high pulse repetition rate (PRR), gas-switched pulse generator system. The main component of the system is a gas-switched Marx-like pulse generator module designed for applications including UWB radar, microwave

R. J. Focia; C. A. Frost

2007-01-01

367

Data gathering in ultra wide band based wireless sensor networks using a mobile node  

Microsoft Academic Search

Ultra-wideband (UWB) communications is receiving significant attention recently due to its high data rates and low power, low interference transmission. This paper considers the issue of utilizing these advantages of UWB to design improved Wireless Sensor Networks (WSNs). In particular, we consider data gathering in wireless sensor networks using a mobile node for data collection. We first propose a network

Deepak Bote; Krishna M. Sivalingam; Prathima Agrawal

2007-01-01

368

An ultra wideband propagation model for wireless cardiac monitoring devices  

Microsoft Academic Search

Wireless communication is an important technology to improve e-health applications such as remote cardiac monitoring. In modern telemedicine it is desirable that implant cardiac devices such as pacemakers can be interrogated and reprogrammed remotely. Such functions require a reliable wireless communication channel between the implant device and an external control unit. In order to increase the longevity of the implant

Ra鷏 Ch醰ez-Santiago; Ali Khaleghi; Ilangko Balasingham

2010-01-01

369

An ultra wideband communication channel model for capsule endoscopy  

Microsoft Academic Search

Capsule endoscopy is an increasingly popular alternative to a tube-based endoscope used in diagnosing gastrointestinal diseases. It enables the inspection of areas that are not easily accessible using traditional endoscopy and reduces patient discomfort. In addition to transferring high-capacity demanding image data, the capsule's wireless interface must provide a wireless link that enables real-time positioning and tracking of the capsule.

S. Stoa; Raul Chavez-Santiago; Ilangko Balasingham

2010-01-01

370

Signal Generation for FMCW Ultra-Wideband Radar  

E-print Network

Ohm N=N0 F0=Freq_0 VCO_Freq=k0*_v 1 fre q VCO . v co n - N. VCO tu ne d N V_1Tone SRC4 Freq=Fref V=(1*exp(-j*pi/2)) V Figure 3.4-ADS Design for PLL The simulation is carried out to generate a 10 GHz RF signal that is phase locked... components equally spaced about the peak indicates that it is coming from amplitude modulation. 43 6.7 6.71 6.72 6.73 6.74 6.75 x 107 5 10 15 20 25 30 35 40 45 Beat Frequency at 67.22 MHz; Delay 3.425 us; Hanning window applied Am pl itu de [d B...

Patel, Aqsa Ejaz

2009-01-01

371

Ultra-wideband radio technology: potential and challenges ahead  

Microsoft Academic Search

An unprecedented transformation in the design, deployment, and application of short-range wireless devices and services is in progress today. This trend is in line with the imminent transition from third- to fourth-generation radio systems, where heterogeneous environments are expected to prevail eventually. A key driver in this transition is the steep growth in both demand and deployment of WLANs\\/WPANs based

Domenico Porcino; Walter Hirt

2003-01-01

372

Ultra-wideband polarimetric imaging of corner reflectors in foliage  

Microsoft Academic Search

An ultrawideband imaging radar was developed. It is a highly mobile, ground-based system capable of 2D and 3D imaging at very close ranges to a synthetic aperture. The radar is fully coherent over two bandwidths (0.1 to 2 GHz and 2 to 18 GHz) and is being used for target and for foliage penetration measurements. The emphasis of the program

D. J. Blejer; S. M. Scarborough; C. E. Frost; H. R. Catalan; K. H. McCoin; J. Roman; D. M. Mukai

1992-01-01

373

Ultra wideband horn antenna for microwave imaging application  

Microsoft Academic Search

Recently, high-contrast and high-resolution microwave imaging has been extensively studied in the detection of early breast cancer, This method is based on the contrast in electrical properties of healthy fatty breast tissues and malignant tissues. In this paper we design a new TEM double-ridged horn antenna for microwave imaging application. Proposed antenna is simulated with two commercially available packages, namely

Hana Amjadi; Farzad Tavakkol Hamedani

2011-01-01

374

Microwave imaging for ultra-wideband antenna based cancer detection  

E-print Network

Breast cancer is one of the most widespread types of cancer in the world. The key factor in treatment is to reliably diagnose the cancer in the early stages. Moreover, currently used clinical diagnostic methods, such as ...

Zhang, Haoyu

2015-06-29

375

Ultra wideband antenna array processing under spatial aliasing  

E-print Network

to estimate the transmitted data signal and the DOA of each source. In the sequel, a subspace-based algorithm is developed and the prob- lem of order estimation is discussed. The adopted signaling framework assumes a subband hopping transmission in order...

Shapoury, Alireza

2009-05-15

376

Ultra wideband linear horn array antenna with slant polarization  

Microsoft Academic Search

A design of linear 8-element horn array antenna with 45-slant polarization operating in octave bandwidth (4...8 GHz) is presented. The array antenna is characterized by sector type radiation patterns with gain ranging from 14 dB (at low frequency) to 18 dB (at high frequency) and side lobe levels less than -12dB. Wide bandwidth, slant polarization and relatively simple construction were

F. F. Dubrovka; S. Y. Martynyuk; P. Ya. Stepanenko; V. M. Tereshchenko; V. V. Marchenko

2005-01-01

377

Design of a Practical Scheme for Ultra Wideband Communication  

E-print Network

of the message. We consider schemes that are straightforward to implement in practical systems and propose two parts of the DHTR system on an FPGA prototype board. We propose two hardware architectures for detection-Jan van der Veen Circuit & Systems, Department of Electrical Engineering Delft University of Technology

van der Veen, Alle-Jan

378

Estimating the Breast Surface Using UWB Microwave Monostatic Backscatter Measurements  

Microsoft Academic Search

This paper presents an algorithm for estimating the location of the breast surface from scattered ultrawideband (UWB) microwave signals recorded across an antenna array. Knowing the location of the breast surface can improve imaging performance if incorporated as a priori information into recently proposed microwave imaging algorithms. These techniques transmit low-power microwaves into the breast using an antenna array, which

David W. Winters; Jacob D. Shea; Ernest L. Madsen; Gary R. Frank; Barry D. Van Veen; Susan C. Hagness

2008-01-01

379

Ultra Compressed Parametric Modeling of UWB Antenna Measurements using symmetries  

Microsoft Academic Search

The need for antenna models, both simple and realistic is more and more often expressed in the context of UWB communications. This paper addresses this topic through an approach based on a drastic reduction of the descriptive parameters set of antennas based on the Spherical Modes Expansion Method, and using the antenna symmetries or pseudo symmetries.

Christophe Roblin; Alain Sibille

380

Tremor acquisition system based on UWB Wireless Sensor Network  

E-print Network

Tremor acquisition system based on UWB Wireless Sensor Network G. Blumrosen1 , M. Uziel2 , B.porrat@huji.ac.il, rubinsky@cs.huji.ac.il Abstract--This work suggest to quantify and analyze tremor using Ultra Wide contact tremor assessment with extremely low radiation and penetration through walls. Tremor is the target

Porrat, Dana

381

UWB Indoor Delay Profile Model For Residential and Commercial Environments  

E-print Network

UWB Indoor Delay Profile Model For Residential and Commercial Environments S.S. Ghassemzadeh1 , L profile at a point in space, while the PDP is a local spatial average. The model is based on 60,000 complex frequency response measurements from 20 commercial buildings and 20 residential homes

Kavcic, Aleksandar

382

Non-coherent synchronization for WBAN UWB systems  

Microsoft Academic Search

This paper presents non-coherent synchronization method for UWB WBAN systems. The non-coherent synchronization including packet detection and SFD detection is described and packet error rate performance in AWGN is provided. Finally, we make a conclusion in view of the implemental aspect.

Jaehwan Kim; Jindoo Jeong; HyungSoo Lee; Sangsung Choi; Jeong-Ki Kim; Do-Wook Kang

2010-01-01

383

FDTD simulation of exposure of biological material to electromagnetic nanopulses  

NASA Astrophysics Data System (ADS)

Ultra-wideband (UWB) electromagnetic pulses of nanosecond duration, or nanopulses, are of considerable interest to the communications industry and are being explored for various applications in biotechnology and medicine. The propagation of a nanopulse through biological matter has been computed using the finite difference-time domain (FDTD) method. The approach required the reparametrization of existing Cole-Cole model-based descriptions of dielectric properties of biological matter in terms of the Debye model without loss of accuracy. Several tissue types have been considered. Results show that the electromagnetic field inside biological tissue depends on incident pulse rise time and width. Rise time dominates pulse behaviour inside tissue as conductivity increases. It has also been found that the amount of energy deposited by 20 kV m-1 nanopulses is insufficient to change the temperature of the exposed material for pulse repetition rates of 1 MHz or less, consistent with recent experimental results.

Simicevic, Neven; Haynie, Donald T.

2005-01-01

384

A 6-9 GHz 5-band CMOS synthesizer for MB-OFDM UWB  

NASA Astrophysics Data System (ADS)

An ultra-wideband frequency synthesizer is designed to generate carrier frequencies for 5 bands distributed from 6 to 9 GHz with less than 3 ns switching time. It incorporates two phase-locked loops and one single-sideband (SSB) mixer. A 2-to-1 multiplexer with high linearity is proposed. A modified wideband SSB mixer, quadrature VCO, and layout techniques are also employed. The synthesizer is fabricated in a 0.18 ?m CMOS process and operates at 1.5-1.8 V while consuming 40 mA current. The measured phase noise is -128 dBc/Hz at 10 MHz offset, and the sideband rejection is -22 dBc at 7.656 GHz.

Pufeng, Chen; Zhiqiang, Li; Xiaosong, Wang; Haiying, Zhang; Tianchun, Ye

2010-07-01

385

3D hybrid EM ray-tracing deterministic UWB channel model, simulations and measurements  

Microsoft Academic Search

Aim of this contribution is to validate our deterministic UWB channel model which integrates the real characteristics of the UWB antennas in the whole effective channel. Our analysis relies on a UWB ray tracing approach since this reflects the dependence on the angle of arrival (AoA) and angle of departure (AoD) of any multipath. In the meanwhile, EM-Simulation tool has

Mohamed El-Hadidy; Taleb Ould Mohamed; Feng Zheng; Thomas Kaiser

2008-01-01

386

Bistability and hysteresis in the emergence of pulses in microstrip Gunn-diode circuits  

NASA Astrophysics Data System (ADS)

We develop time-domain simulations of microwave and THz radiation sources built as arrays of active devices when the radiation wavelength is small as compared to spacing between electronic components. We pursue an approach when the system is represented by equations with time-delay feedback that could generate chaos and other forms of complicated dynamics. The approach simplifies simulations of ultra-wideband effects and exceeds capabilities of frequency-domain methods. As a model case, we simulated a microstrip circuit with Gunn diode and a remote resonator emitting the radiation towards infinity. We observed the emergence of either the continuous waves or the trains of high-frequency pulses depending on the bias conditions. We found bistability and hysteresis in the onset of different oscillation modes that depends on the way of driving the bias voltage into the domain of instability of the given system. The results would allow one to improve the design of THz radiation sources with time-delay coupling between components.

Yurchenko, V. B.; Yurchenko, L. V.

2014-12-01

387

Performance of UWB Impulse Radio With Planar Monopoles Over On-Human-Body Propagation Channel for Wireless Body Area Networks  

Microsoft Academic Search

Ultrawideband (UWB) is a promising technology for wireless body area networks (WBANs). This paper studied the impacts of 3.1-10.6 GHz on-human-body UWB channel on the impulse radio WBAN system. A performance evaluation method is presented for the realistic UWB WBAN systems, which observes the waveform distortion along the signal path. The measurement and characterization of the 3.1-10.6 GHz on-human-body UWB

Yue Ping Zhang; Qiang Li

2007-01-01

388

UWB wireless channels - propagation aspects and interplay with system design  

Microsoft Academic Search

This paper will first present an overview of the current state of the art in the measurement and modeling of UWB propagation channels. We will point out the difference between the two main frequency band of interest (900MHz and 3.1-10.6 GHz), and describe the key channel parameters (attenuation, delay spread, arrival time statistics, amplitude statistics) in different environments. We will

Andreas F. Molisch

2004-01-01

389

UWB Fully-polarimetric GPR Classification of Subsurface Unexploded Ordnance Chi-Chih Chen*  

E-print Network

1 UWB Fully-polarimetric GPR Classification of Subsurface Unexploded Ordnance Chi-Chih Chen-bandwidth (UWB) ground penetrating radar (GPR) was used to collect fully-polarimetric backscattered data from 10 GPR's have been applied to the detection and classification of subsurface ordnance for years

Shubitidze, Fridon

390

Design and Measurements of a quasi-isotropic UWB micro-strip antenna  

E-print Network

Design and Measurements of a quasi-isotropic UWB micro-strip antenna Antoine Diet, Nicolas Ribi鑢e.diet@lss.supelec.fr Abstract This paper summarizes the design and measurements of a quasi-isotropic printed UWB antenna with a simple micro-strip design and a standard technology. The design of this antenna is based

Paris-Sud XI, Universit de

391

Compact Cactus-Shaped Ultra Wide-Band (UWB) Monopole on Organic Symeon Nikolaou*(1)  

E-print Network

Compact Cactus-Shaped Ultra Wide-Band (UWB) Monopole on Organic Substrate Symeon Nikolaou*(1, U.S.A. simos@ece.gatech.edu Abstract: The implementation of a novel cactus-shaped monopole antenna-segments broadband antennas proposed in [4-5] do not cover the whole UWB range. In this paper, a compact cactus

Tentzeris, Manos

392

WDC 2002 London, May 15th-17th, 2002 UWB Network Organization  

E-print Network

1 WDC 2002 London, May 15th-17th, 2002 UWB Network Organization Luca De Nardis, Pierre Baldi, Maria-Gabriella Di Benedetto #12;2 WDC 2002 London, May 15th-17th, 2002 UWB is ... UltraWideBand Impulse radio Carrier-free Baseband Time domain Nonsinusoidal ... #12;3 WDC 2002 London, May

Di Benedetto, Maria-Gabriella

393

UWB array antenna utilizing novel electrical scanning system with tapped delay lines  

Microsoft Academic Search

In this paper, we present a newly developed UWB array antenna adopting a novel electrical scanning system. This antenna was realized by introducing two new technologies. First, each antenna element is equipped with an impulse generator. Second, the phase control between the antenna elements is realized by tapped delay lines and transmitting trigger signals. An experimental UWB array antenna with

F. Sakai; K. Ohta

2010-01-01

394

47 CFR 15.521 - Technical requirements applicable to all UWB devices.  

Code of Federal Regulations, 2010 CFR

...15.521 Technical requirements applicable to all UWB devices. (a) UWB devices may not be employed for the operation of toys. Operation onboard an aircraft, a ship or a satellite is prohibited. (b) Manufacturers and users are reminded of the...

2010-10-01

395

A multiple access protocol for UWB wireless body area networks (WBANs) with narrowband feedback path  

Microsoft Academic Search

This paper focuses on design and performance of a multiple access protocol for an Ultra Wide Band (UWB) based Wireless Body Area Network (WBAN). The proposed WBAN consists of wearable sensor nodes which communicate with a coordinator node using a UWB transmitter and receive a feedback from the coordinator using a narrowband receiver. Advantages of using a narrowband signal instead

K. M. Silva; M. R. Yuce; J. Y. Khan

2011-01-01

396

UWB EMI To Aircraft Radios: Field Evaluation on Operational Commercial Transport Airplanes. Volume 1  

NASA Technical Reports Server (NTRS)

Ultrawideband (UWB) transmitters may soon be integrated into a wide variety of portable electronic devices (PEDs) that passengers routinely carry on board commercial airplanes. Airlines and the FAA will have difficulty controlling passenger use of UWB transmitters during flights with current airline policies and existing wireless product standards. The aeronautical community is concerned as to whether evolving FCC UWB rules are adequate to protect legacy and emerging aeronautical radio systems from electromagnetic interference (EMI) from emerging UWB products. To address these concerns, the NASA Office of Space Communications and Chief Spectrum Managers assembled a multidisciplinary team from NASA LaRC, NASA JPL, NASA ARC, FAA, United Airlines, Sky West Airlines, and Eagles Wings Inc. to carry out a comprehensive series of tests aimed at determining the nature and extent of any EMI to aeronautical communication and navigation systems from UWB devices meeting FCCapproved and proposed levels for unlicensed handheld transmitters.

Oria, A. J. (Editor); Ely, Jay J.; Martin, Warren L.; Shaver, Timothy W.; Fuller, Gerald L.; Zimmerman, John; Fuschino, Robert L.; Larsen, William E.

2005-01-01

397

Distortion effects in a switch array UWB radar for time-lapse imaging of human heartbeats  

NASA Astrophysics Data System (ADS)

Cardiovascular diseases (CVD) are a major cause of deaths all over the world. Microwave radar can be an alternative sensor for heart diagnostics and monitoring in modern healthcare that aids early detection of CVD symptoms. In this paper measurements from a switch array radar system are presented. This UWB system operates below 3 GHz and does time-lapse imaging of the beating heart inside the human body. The array consists of eight fat dipole elements. With a switch system, every possible sequence of transmit/receive element pairs can be selected to build a radar image from the recordings. To make the radar waves penetrate the human tissue, the antenna array is placed in contact with the body. Removal of the direct signal leakage through the antennas and body surface are done by high-pass (HP) filtering of the data prior to image processing. To analyze the results, measurements of moving spheres in air and simulations are carried out. We see that removal of the direct signal introduces amplitude distortion in the images. In addition, the effect of small target motion between the collection times of data from the individual elements is analyzed. With low pulse repetition frequency (PRF) this motion will distort the image. By using data from real measurements of heart motion in simulations, we analyze how the PRF and the antenna geometry influence this distortions.

Brovoll, Sverre; Berger, Tor; Aardal, 舮vind; Lande, Tor S.; Hamran, Svein-Erik

2014-05-01

398

A low-voltage energy-sampling IR-UWB digital baseband employing quadratic correlation  

E-print Network

This paper describes a digital baseband designed for use in a non-coherent IR-UWB system. Owing to the nonlinear statistics introduced by the energy-sampling RF front-end, the baseband employs a new quadratic correlation ...

Chandrakasan, Anantha P.

399

Non-Coherent UWB Communication in the Presence of Multiple Narrowband Interferers  

E-print Network

There has been an emerging interest in non-coherent ultra-wide bandwidth (UWB) communications, particularly for low-data rate applications because of its low-complexity and low-power consumption. However, the presence of ...

Rabbachin, Alberto

400

Performance of Coherent Receivers for PCTH-Based UWB System with Diversiform Modulation Schemes  

NASA Astrophysics Data System (ADS)

The performances of a PCTH-based communication UWB system with diversiform modulation schemes are compared on the classic AWGN channel propagation and the realistic IEEE-UWB channel model. By employing different versions of modulation at the transmitters, the performances of an optimal receiver and a Rake receiver with various combining schemes are studied in this paper. The numerical results for several compared cases illustrate the tradeoff between transmitter diversity and receiver complexity. It is shown that the actual performance of the PAM-PCTH scheme can be better in both kinds of channel propagation. We also find that the PCTH-based UWB system with the Rake receiver has better performance than the conventional proposal for overcoming the multipath propagation effects in the UWB indoor environment.

Gong, Yun-Rui; He, Di; He, Chen; Jiang, Ling-Ge

401

Efficient modulation on the performance of coherent receivers for pseudo-chaotic TH-UWB system  

Microsoft Academic Search

The performances of pseudo-chaotic communication time-hopping UWB system with efficient modulation schemes are compared on the classic AWGN channel propagation and the realistic IEEE-UWB channel model. By employing different versions of modulation at the transmitters, the performances of an optimal receiver and a Rake receiver with various combining schemes are studied in this paper. The numerical results for several compared

Yunrui Gong; Di He; Chen He; Lingge Jiang

2008-01-01

402

Low power self-quenched super-regenerative impulse-FM-UWB transceiver for WBAN  

Microsoft Academic Search

This paper presents a low power self quenched super-regenerative Impulse-FM-UWB transceiver architecture for wireless body area networks. The design architecture consists of two different colpitts oscillators tuned at 3.5 GHz and 4 GHz. The external PCB loop antenna is incorporated into these oscillators as an inductive element to achieve high sensitivity and selectivity. These oscillators transmit impulses of FM-UWB signals

M. Anis; G. Grau; N. Wehn

2010-01-01

403

Low power super-regenerative Impulse-FM-UWB transceiver for WBAN  

Microsoft Academic Search

This paper presents a low power super-regenerative Impulse-FM-UWB transceiver architecture for wireless body area networks. The design architecture consists of two different colpitts oscillators tuned at 3.5GHz and 4GHz. The external PCB loop antenna is incorporated into these oscillators as an inductive element to achieve high sensitivity and selectivity. These oscillators transmit impulses of FM-UWB signals in switched OOK mode

M. Anis; M. Ortmanns; N. Wehn

2010-01-01

404

A 3.1-4.8 GHz CMOS receiver for MB-OFDM UWB  

NASA Astrophysics Data System (ADS)

An integrated fully differential ultra-wideband CMOS receiver for 3.1-4.8 GHz MB-OFDM systems is presented. A gain controllable low noise amplifier and a merged quadrature mixer are integrated as the RF front-end. Five order Gm-C type low pass filters and VGAs are also integrated for both I and Q IF paths in the receiver. The ESD protected chip is fabricated in a Jazz 0.18 ?m RF CMOS process and achieves a maximum total voltage gain of 65 dB, an AGC range of 45 dB with about 6 dB/step, an averaged total noise figure of 6.4 to 8.8 dB over 3 bands and an in-band IIP3 of -5.1 dBm. The receiver occupies 2.3 mm2 and consumes 110 mA from a 1.8 V supply including test buffers and a digital module.

Guang, Yang; Wang, Yao; Jiangwei, Yin; Renliang, Zheng; Wei, Li; Ning, Li; Junyan, Ren

2009-01-01

405

36 R&DMagazine September 2007 www.rdmag.com LIFE SCIENCE  

E-print Network

with the development of the Elec- troNeedle Biomedical Sensor Array, a device that, when pressed against the skin, can diagnostic device based on ultra wideband (UWB) technology for the detection of pneumothorax in real time36 R&DMagazine September 2007 www.rdmag.com LIFE SCIENCE Diagnostic Medical Lab on a Patch

406

A Study and Practice on the Wireless Networking Curriculum  

Microsoft Academic Search

The ongoing development of wireless networking produces a lot of new technologies and applications, such as Ultra Wideband (UWB) and Wireless Sensor Networks (WSN). For traditional wired networking curriculums, the teaching is relatively easy due to the mature and stable measures. However, different from the traditional wired networking teaching, the Wireless Networking Teaching (WNT) is facing new challenges due to

Xianliang Jiang; Guang Jin; Xiaodong Wang; Cuixia Ni; Zhijun Xie

2011-01-01

407

Tennessee Tech Time-Reversal Based Range Extension Technique for  

E-print Network

I I Tennessee Tech UNIVERSITY Time-Reversal Based Range Extension Technique for Ultra-wideband (UWB for Manufacturing Research Tennessee Technological University Cookeville, TN 38501 * 20070924084 I #12;REPORT ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION Tennessee Technological University REPORT

Qiu, Robert Caiming

408

Challenge: Ultra-Low-Power Energy-Harvesting Active Networked Tags (EnHANTs)  

E-print Network

]@ee.columbia.edu danr@cs.columbia.edu, [wangx, gil]@ee.columbia.edu ABSTRACT This paper presents the design challenges be attached to objects that are traditionally not networked (e.g., books, clothing, and produce), thereby, ultra-wideband (UWB) circuit design, and organic electronic harvesting techniques will enable

Zussman, Gil

409

Design of novel on-chip antennas with multi-band for wireless sensor networks  

Microsoft Academic Search

This paper presents a novel on-chip antenna with quintuple band so that it will be able to operate in the ultra wideband (UWB). The antenna consists of two trapezoidal slots which are symmetrical in the patch with coaxial feeding. The two types of substrate we have investigated for antenna design are the HRS and Pyrex glass wafers. The possibility of

Dong H. Park

2008-01-01

410

UCGE Reports Number 20277  

E-print Network

UCGE Reports Number 20277 Department of Geomatics Engineering Ultra Wideband Augmented GPS (URL: http://www.geomatics.ucalgary.ca/research/publications) by David Sung-Tat Chiu December 2008 #12 OF GEOMATICS ENGINEERING CALGARY, ALBERTA DECEMBER, 2008 David Sung-Tat Chiu 2008 ii #12;ABSTRACT UWB has

Calgary, University of

411

The diamond dipole: a Gaussian impulse antenna  

Microsoft Academic Search

When a typical narrowband antenna is excited by an ultra-wideband (UWB) impulse, the antenna rings at its resonant frequency, stretching out the waveform in time. A resonant antenna, like the bow tie, discone, or bicone have been available for years. A bow tie has a relatively high input impedance, and requires a matching balun to make it useable with a

H. G. Schantz; L. Fullerton

2001-01-01

412

A Quadrature Downconversion Autocorrelation Receiver Architecture for UWB  

E-print Network

by a polarity reversed pulse 颅g(t). To send a logical one, two pulses with the same polarity are sent. When using polar NRZ modulation, for a logical zero, a pulse g(t) is transmitted, subsequently followed the energy of the pulse while the polarity of the output contains the data. If the output is negative

Serdijn, Wouter A.

413

Adaptive target detection in foliage-penetrating SAR images using alpha-stable models  

Microsoft Academic Search

Detecting targets occluded by foliage in foliage-penetrating (FOPEN) ultra-wideband synthetic aperture radar (UWB SAR) images is an important and challenging problem. Given the different nature of target returns in foliage and nonfoliage regions and very low signal-to-clutter ratio in UWB imagery, conventional detection algorithms fail to yield robust target detection results. A new target detection algorithm is proposed that (1)

Amit Banerjee; Philippe Burlina; Rama Chellappa

1999-01-01

414

Wearable system-on-a-chip UWB radar for contact-less cardiopulmonary monitoring: present status.  

PubMed

The present status of the project aimed at the realization of an innovative wearable system-on-chip UWB radar for the cardiopulmonary monitoring is presented. The overall system consists of a wearable wireless interface including a fully integrated UWB radar for the detection of the heart beat and breath rates, and a IEEE 802.15.4 ZigBee low-power radio interface. The principle of operation of the UWB radar for the monitoring of the heart wall is summarized. With respect to the prior art, this paper reports the results of the experimental characterization of the intra-body channel loss, which has been carried out successfully in order to validate the theoretical model employed for the radar system analysis. Moreover, the main building blocks of the radar have been manufactured in 90 nm CMOS technology by ST-Microelectronics and the relevant performance are resulted in excellent agreement with those expected by post-layout simulations. PMID:19163907

Zito, D; Pepe, D; Mincica, M; Zito, F; De Rossi, D; Lanata, A; Scilingo, E P; Tognetti, A

2008-01-01

415

Modeling, Real-Time Estimation, and Identification of UWB Indoor Wireless Channels  

SciTech Connect

In this paper, stochastic differential equations (SDEs) are used to model ultrawideband (UWB) indoor wireless channels. We show that the impulse responses for time-varying indoor wireless channels can be approximated in a mean square sense as close as desired by impulse responses that can be realized by SDEs. The state variables represent the inphase and quadrature components of the UWB channel. The expected maximization and extended Kalman filter are employed to recursively identify and estimate the channel parameters and states, respectively, from online received signal strength measured data. Both resolvable and non-resolvable multipath received signals are considered and represented as small-scaled Nakagami fading. The proposed models together with the estimation algorithm are tested using UWB indoor measurement data demonstrating the method s viability and the results are presented.

Olama, Mohammed M [ORNL] [ORNL; Djouadi, Seddik M [ORNL] [ORNL; Li, Yanyan [ORNL] [ORNL; Fathy, Aly [University of Tennessee (UT)] [University of Tennessee (UT)

2013-01-01

416

Smart container UWB sensor system for situational awareness of intrusion alarms  

DOEpatents

An in-container monitoring sensor system is based on an UWB radar intrusion detector positioned in a container and having a range gate set to the farthest wall of the container from the detector. Multipath reflections within the container make every point on or in the container appear to be at the range gate, allowing intrusion detection anywhere in the container. The system also includes other sensors to provide false alarm discrimination, and may include other sensors to monitor other parameters, e.g. radiation. The sensor system also includes a control subsystem for controlling system operation. Communications and information extraction capability may also be included. A method of detecting intrusion into a container uses UWB radar, and may also include false alarm discrimination. A secure container has an UWB based monitoring system

Romero, Carlos E.; Haugen, Peter C.; Zumstein, James M.; Leach, Jr., Richard R.; Vigars, Mark L.

2013-06-11

417

Super multi-channel recording systems with UWB wireless transmitter for BMI.  

PubMed

In order to realize a low-invasive and high accuracy Brain-Machine Interface (BMI) system for clinical applications, a super multi-channel recording system was developed in which 4096 channels of Electrocorticogram (ECoG) signal can be amplified and transmitted to outside the body by using an Ultra Wide Band (UWB) wireless system. Also, a high density, flexible electrode array made by using a Parylene-C substrate was developed that is composed of units of 32-ch recording arrays. We have succeeded in an evaluation test of UWB wireless transmitting using a body phantom system. PMID:25571167

Suzuki, Takafumi; Ando, Hiroshi; Yoshida, Takeshi; Sawahata, Hirohito; Kawasaki, Keisuke; Hasegawa, Isao; Matsushita, Kojiro; Hirata, Masayuki; Yoshimine, Toshiki; Takizawa, Kenichi

2014-08-01

418

Three-dimensional FDTD simulation of biomaterial exposure to electromagnetic nanopulses  

NASA Astrophysics Data System (ADS)

Ultra-wideband (UWB) electromagnetic pulses of nanosecond duration, or nanopulses, have recently been approved by the Federal Communications Commission for a number of different applications. They are also being explored for applications in biotechnology and medicine. The simulation of the propagation of a nanopulse through biological matter, previously performed using a two-dimensional finite-difference time-domain (FDTD) method, has been extended here into a full three-dimensional computation. To account for the UWB frequency range, the geometrical resolution of the exposed sample was 0.25 mm and the dielectric properties of biological matter were accurately described in terms of the Debye model. The results obtained from the three-dimensional computation support the previously obtained results: the electromagnetic field inside a biological tissue depends on the incident pulse rise time and width, with increased importance of the rise time as the conductivity increases; no thermal effects are possible for the low pulse repetition rates, supported by recent experiments. New results show that the dielectric sample exposed to nanopulses behaves as a dielectric resonator. For a sample in a cuvette, we obtained the dominant resonant frequency and the Q-factor of the resonator.

Simicevic, Neven

2005-11-01

419

Integrated navigation fusion strategy of INS/UWB for indoor carrier attitude angle and position synchronous tracking.  

PubMed

In some GPS failure conditions, positioning for mobile target is difficult. This paper proposed a new method based on INS/UWB for attitude angle and position synchronous tracking of indoor carrier. Firstly, error model of INS/UWB integrated system is built, including error equation of INS and UWB. And combined filtering model of INS/UWB is researched. Simulation results show that the two subsystems are complementary. Secondly, integrated navigation data fusion strategy of INS/UWB based on Kalman filtering theory is proposed. Simulation results show that FAKF method is better than the conventional Kalman filtering. Finally, an indoor experiment platform is established to verify the integrated navigation theory of INS/UWB, which is geared to the needs of coal mine working environment. Static and dynamic positioning results show that the INS/UWB integrated navigation system is stable and real-time, positioning precision meets the requirements of working condition and is better than any independent subsystem. PMID:25121111

Fan, Qigao; Wu, Yaheng; Hui, Jing; Wu, Lei; Yu, Zhenzhong; Zhou, Lijuan

2014-01-01

420

Integrated Navigation Fusion Strategy of INS/UWB for Indoor Carrier Attitude Angle and Position Synchronous Tracking  

PubMed Central

In some GPS failure conditions, positioning for mobile target is difficult. This paper proposed a new method based on INS/UWB for attitude angle and position synchronous tracking of indoor carrier. Firstly, error model of INS/UWB integrated system is built, including error equation of INS and UWB. And combined filtering model of INS/UWB is researched. Simulation results show that the two subsystems are complementary. Secondly, integrated navigation data fusion strategy of INS/UWB based on Kalman filtering theory is proposed. Simulation results show that FAKF method is better than the conventional Kalman filtering. Finally, an indoor experiment platform is established to verify the integrated navigation theory of INS/UWB, which is geared to the needs of coal mine working environment. Static and dynamic positioning results show that the INS/UWB integrated navigation system is stable and real-time, positioning precision meets the requirements of working condition and is better than any independent subsystem. PMID:25121111

Wu, Yaheng; Hui, Jing; Wu, Lei; Zhou, Lijuan

2014-01-01

421

Implementation and development of compact UWB proximity fuze sensor system  

Microsoft Academic Search

A novel implementation of a low-cost proximity fuze sensor system is presented. This system has very small dimension with 40mm diameter and 25mm high, which can detect the target of a fixed distance, with a resolution of less than 20cm. The pulse generated by S RD (step recovery diode) is approximate Gaussian pulse, which have pulse duration of about 250ps

Zhao-Bo Li

2011-01-01

422

Compact Ultra Wide-Band (UWB) CPW-fed Elliptical Monopole on Liquid Crystal Polymer (LCP)  

E-print Network

Compact Ultra Wide-Band (UWB) CPW-fed Elliptical Monopole on Liquid Crystal Polymer (LCP) Symeon is fabricated on 100 碌m thick liquid crystal polymer (LCP) with an overall board dimension of 32 mm x 30 mm monopole is proposed on a Liquid Crystal Polymer (LCP) substrate. The elliptical shape and the CPW ground

Tentzeris, Manos

423

Compact Ultra Wide-Band (UWB) CPW-fed Elliptical Monopole on Liquid Crystal Polymer (LCP)  

Microsoft Academic Search

The implementation of a compact coplanar waveguide (CPW)-fed elliptical monopole antenna that demonstrates good impedance match and omni-directional radiation patterns in the whole ultra wide band range (UWB) is discussed. The proposed antenna is fabricated on 100 mum thick liquid crystal polymer (LCP) with an overall board dimension of 32 mm times 30 mm. Return loss and radiation pattern measurements

Symeon Nikolaou; Dimitrios E. Anagnostou; George E. Ponchak; Manos M. Tentzeris; John Papapolymerou

2006-01-01

424

A Polyphase-Based Processing for All-Digital UWB Receiver Architectures  

Microsoft Academic Search

In this paper we propose a polyphase processing solution for relaxing the strict timing constraints of all-digital ultra wide band (UWB) receiver architectures. The work is motivated by the fact that, while interleaved data acquisition systems have been investigated in the literature with the aim of mitigating the strict timing requirements imposed by the sampling theorem, less attention has been

Marco Di Renzo; Fabio Graziosi; Fortunato Santucci

2006-01-01

425

Development of a UWB GPR System for Detecting Small Objects Buried under Ground  

E-print Network

Development of a UWB GPR System for Detecting Small Objects Buried under Ground Young-Jin Park. Shinnae Techno-Town 801, Sangbong, Seoul, 131-220, Korea Abstract A ground penetrating radar (GPR) using. A bistatic mode in which the GPR system uses separate transmitting and receiving antennas is applied

Ha, Dong S.

426

Software defined radio layer for IR-UWB systems in Wireless Sensor Network Context  

E-print Network

Software defined radio layer for IR-UWB systems in Wireless Sensor Network Context Aubin Lecointre Position Modulation). We will propose here a reliable and software defined radio layer for ad hoc smart Toulouse cedex 4/ France plana@lass.fr Abstract This paper addresses the radio interface problematic

Paris-Sud XI, Universit de

427

47 CFR 15.517 - Technical requirements for indoor UWB systems.  

Code of Federal Regulations, 2010 CFR

...1) Indoor UWB devices, by the nature of their design, must be capable of operation only indoors...enter a building. (3) The use of outdoor mounted antennas, e.g., antennas mounted on the outside of a building or on a...

2010-10-01

428

47 CFR 15.517 - Technical requirements for indoor UWB systems.  

Code of Federal Regulations, 2012 CFR

...1) Indoor UWB devices, by the nature of their design, must be capable of operation only indoors...enter a building. (3) The use of outdoor mounted antennas, e.g., antennas mounted on the outside of a building or on a...

2012-10-01

429

47 CFR 15.517 - Technical requirements for indoor UWB systems.  

Code of Federal Regulations, 2011 CFR

...1) Indoor UWB devices, by the nature of their design, must be capable of operation only indoors...enter a building. (3) The use of outdoor mounted antennas, e.g., antennas mounted on the outside of a building or on a...

2011-10-01

430

47 CFR 15.517 - Technical requirements for indoor UWB systems.  

Code of Federal Regulations, 2014 CFR

...1) Indoor UWB devices, by the nature of their design, must be capable of operation only indoors...enter a building. (3) The use of outdoor mounted antennas, e.g., antennas mounted on the outside of a building or on a...

2014-10-01

431

47 CFR 15.517 - Technical requirements for indoor UWB systems.  

Code of Federal Regulations, 2013 CFR

...1) Indoor UWB devices, by the nature of their design, must be capable of operation only indoors...enter a building. (3) The use of outdoor mounted antennas, e.g., antennas mounted on the outside of a building or on a...

2013-10-01

432

CROSS LAYER DESIGN OF MULTIMEDIA TRANSMISSION OVER COGNITIVE RADIO UWB MULTIBAND OFDM SYSTEM  

Microsoft Academic Search

The Cognitive Radio (CR) enables spectrum aware communication protocols to sense the spectral environment and use this information to opportunistically provide wireless links that meet the user communications requirements optimally. CR techniques can be applied to Multi-band OFDM based UWB systems in order to continuously detect the presence of primary users, and accordingly shape the transmitted signal spectrum to allow

Norazizah M. Aripin; Rozeha A. Rashid; Norulhusna Ahmad; Aida E. M Hamzah; Norsheila Fisal; Sharifah K. Syed

433

Ultra compressed parametric modeling for symmetric or pseudo-symmetric UWB Antenna  

Microsoft Academic Search

This paper deals with the parametric modeling of UWB antenna response. Highly reduced model orders based on the singularity expansion method and the spherical modes expansion method are obtained, with extra reduction when antenna symmetries or pseudo symmetries are taken into account.

Ch. Roblin

2008-01-01

434

Airborne array aperture UWB UHF radar-motivation and system considerations  

Microsoft Academic Search

The paper discusses the necessity, feasibility and technology of FOPEN GMTI. It argues that this functionality may be one mode in a multi-function UWB UHF system, which jointly possesses the capabilities for air target MTI and high resolution FOPEN SAR. The radar platform may be a UAV or an aircraft, whereas it is proposed to use the push boom type

Hans Hellsten; Lars M. H. Ulander

1999-01-01

435

Airborne array aperture UWB UHF radar-motivation and system considerations  

Microsoft Academic Search

This paper discusses the necessity, feasibility, and technology of FOPEN GMTI. It argues that this functionality may be one mode in a multi-function UWB UHF system, which jointly possesses the capabilities for air target MTI and high resolution FOPEN SAR. The radar platform may be a UAV or an aircraft, whereas, we propose to use the push boom type of

H. Hellsten; L. M. H. Ulander

2000-01-01

436

Study of a printed circular disc monopole antenna for UWB systems  

Microsoft Academic Search

This paper presents a study of a novel monopole antenna for ultrawide-band (UWB) applications. Printed on a dielectric substrate and fed by a 50 ? microstrip line, a planar circular disc monopole has been demonstrated to provide an ultra wide 10 dB return loss bandwidth with satisfactory radiation properties. The parameters which affect the performance of the antenna in terms

Jianxin Liang; Choo C. Chiau; Xiaodong Chen; Clive G. Parini

2005-01-01

437

Dispersive Properties of Terminal-Loaded Dipole Antennas in UWB Link Anatoliy O. Boryssenko(1)  

E-print Network

is explored for controlling dispersive properties of antennas and meeting several design objectives. The transmitting antenna is excited by a set of time-harmonic signals of unit amplitude in the given band BWDispersive Properties of Terminal-Loaded Dipole Antennas in UWB Link Anatoliy O. Boryssenko(1

Southern California, University of

438

Performance of Time Domain Migration Influenced by Non-Ideal UWB Antennas  

Microsoft Academic Search

The antennas in ultrawideband (UWB) systems act as filters in both frequency domain and the spatial domain. This means that the antenna influence on a received signal varies with the wave incidence angle. This is particulary important for imaging systems, which make use of the time information of the received signals. However, since the incidence angles of the signals are

Malgorzata Janson; Thomas Zwick; Werner Wiesbeck

2009-01-01

439

Impact of non-ideal antennas on the performance of UWB imaging systems  

Microsoft Academic Search

In this paper the influence of non-ideal antennas on the quality of UWB imagery is analyzed. The frequency dependent patterns of different antennas are measured and inserted into a simulation model. The obtained raw data are focused using the Kirchhoff migration method and the positions of the simulated scatterers are extracted. Using these data the positioning error, resolution, and coverage

Malgorzata Porebska; Jens Timmermann; Christian Sturm; Thomas Zwick; Werner Wiesbeck

2008-01-01

440

A Fully Integrated 3 to 5 GHz CMOS Mixer with Active Balun for UWB Receiver  

Microsoft Academic Search

A fully integrated 3-to-5 GHz CMOS mixer for UWB system is presented in this paper. The designed mixer utilizes a dynamic injection circuit to reduce noise figure. In order to adjust the conversion gain, linearity, and noise figure easily, we connect a capacitor and a resistor in series between the drain and the gate of a NMOS transistor. A designed

De-mao Chen; Zhi-ming Lin

2006-01-01

441

Integrated transceivers for UWB breast cancer imaging: Architecture and circuit constraints  

Microsoft Academic Search

We present a behavioral analysis of two different transceiver architectures for UWB breast cancer imaging employ- ing a SFCW radar system. A mathematical model of the direct conversion and super heterodyne architectures together with a numerical breast phantom are developed. FDTD simulations data are used on the behavioral model to investigate the limits of both architectures from a circuit-level point

Matteo Bassi; Andrea Bevilacqua; Andrea Gerosa; Andrea Neviani

2011-01-01

442

Evaluation in terms of BER of the WBAN system using UWB and ISM band  

Microsoft Academic Search

This paper is concerned with clarifying the influence of the human body on the radio wave propagation of a wearable device for on-body wireless communications. We have derived the transmission coefficients analytically, and have evaluated in terms of the bit error rate, digital communications using the UWB band and the ISM band of 915 MHz. I. INTRODUCTION In recent years,

Takayuki Sasamori; Yudai Satoh; Teruo Tobana; Yoji Isota; Masaharu Takahashi; Toru Uno

2011-01-01

443

Radio-frequency integrated-circuit design for CMOS single-chip UWB systems  

E-print Network

Low cost, a high-integrated capability, and low-power consumption are the basic requirements for ultra wide band (UWB) system design in order for the system to be adopted in various commercial electronic devices in the near future. Thus, the highly...

Jin, Yalin

2009-05-15

444

Design and implementation of frequency synthesizers for 3-10 ghz mulitband ofdm uwb communication  

E-print Network

. This work proposes a frequency band plan for multiband OFDM based UWB radios in the 3.1-10.6 GHz range. Based on this frequency plan, two 11-band frequency synthesizers are designed, implemented and tested making them one of the first frequency synthesizers...

Mishra, Chinmaya

2009-05-15

445

Design of a family of ISI free pulses for very high data rate UWB Wireless Systems  

E-print Network

hardware, and low interference. However, tremendous R&D efforts are re- quired to face various technical levels depending upon the shift frequency. Using this scheme and with a certain choice of design transmissions such as low power, high data rate, immunity to multipath propagation, less complex transceiver

Chaturvedi, A K

446

Subnanosecond hybrid modulator for UWB and HPM applications  

Microsoft Academic Search

A subnanosecond hybrid modulator with an output impedance of 45 ? and some systems based on this modulator have been tested. The modulator consists of a type SM-3NS driver with all-solid-state-switches, which is capable of producing 5-ns high-voltage pulses, and a pulse peaker with hydrogen spark gaps. The driver output stage contains an inductive energy store and a SOS-diode opening

M. I. Yalandin; S. K. Lyubutin; S. N. Rukin; V. G. Shpak; S. A. Shunailov; B. G. Slovikovsky

2002-01-01

447

Techniques for Clutter Suppression in the Presence of Body Movements during the Detection of Respiratory Activity through UWB Radars  

PubMed Central

This paper focuses on the feasibility of tracking the chest wall movement of a human subject during respiration from the waveforms recorded using an impulse-radio (IR) ultra-wideband radar. The paper describes the signal processing to estimate sleep apnea detection and breathing rate. Some techniques to solve several problems in these types of measurements, such as the clutter suppression, body movement and body orientation detection are described. Clutter suppression is achieved using a moving averaging filter to dynamically estimate it. The artifacts caused by body movements are removed using a threshold method before analyzing the breathing signal. The motion is detected using the time delay that maximizes the received signal after a clutter removing algorithm is applied. The periods in which the standard deviations of the time delay exceed a threshold are considered macro-movements and they are neglected. The sleep apnea intervals are detected when the breathing signal is below a threshold. The breathing rate is determined from the robust spectrum estimation based on Lomb periodogram algorithm. On the other hand the breathing signal amplitude depends on the body orientation respect to the antennas, and this could be a problem. In this case, in order to maximize the signal-to-noise ratio, multiple sensors are proposed to ensure that the backscattered signal can be detected by at least one sensor, regardless of the direction the human subject is facing. The feasibility of the system is compared with signals recorded by a microphone. PMID:24514883

Lazaro, Antonio; Girbau, David; Villarino, Ramon

2014-01-01

448

Pulse Oximetry  

MedlinePLUS

... Society Pulse Oximetry amount of gases (oxygen and carbon dioxide) that are in your blood. To get an ... Also, a pulse oximeter does not measure your carbon dioxide level. How accurate is the pulse oximeter? The ...

449

Super-resolution techniques for velocity estimation using UWB random noise radar signals  

NASA Astrophysics Data System (ADS)

The Doppler spread pertaining to the ultrawideband (UWB) radar signals from moving target is directly proportional to the bandwidth of the transmitted signal and the target velocity. Using typical FFT-based methods, the estimation of true velocities pertaining to two targets moving with relatively close velocities within a radar range bin is problematic. In this paper, we extend the Multiple Signal Classification (MUSIC) algorithm to resolve targets moving velocities closer to each other within a given range bin for UWB random noise radar waveforms. Simulated and experimental results are compared for various target velocities using both narrowband (200MHz) and wideband (1GHz) noise radar signals, clearly establishing the unbiased and unambiguous velocity estimations using the MUSIC algorithm.

Dawood, Muhammad; Quraishi, Nafish; Alejos, Ana V.

2011-06-01

450

Performance of UWB Channel Gain Estimation Algorithm Based on Frequency Response Correlation  

NASA Astrophysics Data System (ADS)

This letter proposes an Ultra WideBand (UWB) channel gain estimation algorithm that is based on frequency response correlation. From data measured in indoor and outdoor environments, the frequency correlation statistics of the UWB channel are characterized by correlation coefficients, which are represented as functions of the frequency separation according to the propagation environments. We use empirically established correlation coefficient models to develop the proposed channel gain estimation algorithm. In this algorithm, unknown channel gains of intermediate frequencies are estimated from known channel gains of neighboring reference frequencies. The performance of the proposed algorithm is evaluated against various configurations of reference frequencies and compared with that of a conventional estimation algorithm using a linear interpolation scheme.

Choi, Jinwon; Sung, Yu-Suk; Kim, Yong-Hwa; Kim, Seong-Cheol

451

Fabrication of CPW-Fed Fractal Antenna for UWB Applications with Omni-Directional Patterns  

PubMed Central

Novel and compact CPW-fed antennas are proposed comprised of a fractal patch and modified ground-plane. The ground-plane is truncated at the center and includes dielectric notches at its side to enhance the antenna's impedance bandwidth. The dimensions of the notches effectively control the upper and lower band edges of the antenna. The optimized antenna operates across 2.9512.81?GHz for S11 ? ?10?dB. Omnidirectional radiation pattern is achieved over the full UWB frequency range. The miniaturized antenna has a total size of 14 18 1?mm3. The characteristics of the proposed antenna are suitable for UWB wireless communication requiring low profile antennas. PMID:24672314

Sedghi, Tohid; Jalali, Mahdi; Aribi, Tohid

2014-01-01

452

An Entropy Based Approach for Sense-through Foliage Target Detection Using UWB Radar  

Microsoft Academic Search

\\u000a In this paper, we study, sense-through foliage target detection using ultra wide-band (UWB) radars. Target detection through\\u000a foliage is an ongoing research interest due to the complexity of the environment. Foliage is a time varying and rich scattering\\u000a environment due to the presence of unwanted echoes and movement of the branches of trees. After analyzing the characteristics\\u000a of different echoes

Ishrat Maherin; Qilian Liang

453

An Analytical Framework for Assessing Coding Performance in Multi-User IR-UWB Systems  

Microsoft Academic Search

The coding performance of impulse radio ultra-wide bandwidth systems in the presence of multi-user interference is studied. Analytical expressions for assessing the codeword error probability and bit error probability are derived for soft-decision decoders in lognormal multipath fading UWB channels where the Rake receiver is used for signal detection. Numerical results are presented for different codes and error rate levels,

Hua Shao; Norman C. Beaulieu

2010-01-01

454

A parametric UWB propagation channel estimation and its performance validation in an anechoic chamber  

Microsoft Academic Search

This paper presents an ultrawide-band (UWB) channel sounding scheme with a parametric channel estimation to seek accurate probing of the propagation channel. The channel sounder consists of a vector network analzer and synthetic array to measure spatial transfer functions. The measured data are then applied to a maximum-likelihood (ML)-based estimator. The concepts implemented in the ML-based parametric channel estimation are:

Katsuyuki Haneda; Jun-Ichi Takada; Takehiko Kobayashi

2006-01-01

455

A multi-band IR-UWB HDR transceiver: architecture and indoor channel measurements  

Microsoft Academic Search

This paper presents an architecture of an IR-UWB MB-OOK non-coherent transceiver realized at Mitsubishi Electric. Channel measurements in real indoor environment based on this realized prototype are provided. The different components of this transceiver are described. A comparison between the use of directional and omnidirectional antennas at both emission and reception is presented. Then, a data rate estimation of the

Mohamad Mrou; St閜hane Mall間ol; Sylvain Haese; Gha飐 El-Zein; Alexis Bisiaux; St閜hane Paquelet

2009-01-01

456

A NOVEL UWB ELLIPTICAL SLOT ANTENNA WITH BAND-NOTCHED CHARACTERISTICS  

Microsoft Academic Search

Abstract桾his paper presents a novel band-notched elliptical slot antenna for Ultra Wide-Band (UWB) communication, which is printed on a dielectric substrate of RT\\/duroid 6006 with relative permittivity (?r) of 6.0, thickness of 1.27 mm, and fed by an elliptical open ended microstrip line connected to the 50 ? main line. This antenna is designed to be used in frequency band,of

Rajab Fallahi; Abdol Aziz Kalteh; Mahdi Golparvar Roozbahani

2008-01-01

457

A novel microstrip-fed UWB circular slot antenna with 5GHz band-notch characteristics  

Microsoft Academic Search

In this paper, a new notch frequency circular slot antenna is proposed for ultra wide-band (UWB) applications. Antenna is printed on a dielectric substrate of RO4350B with relative permittivity (epsivr) of 3.4 and thickness of 500 mum. Antenna is fed by a circular open ended microstrip line is connected to a 50 Omega main line. This antenna is designed to

A.-A. Kalteh; R. Fallahi; M. G. Roozbahani

2008-01-01

458

Software defined radio layer for IR-UWB systems in Wireless Sensor Network Context  

E-print Network

This paper addresses the radio interface problematic for MANET (Mobile Ad-hoc NETwork) applications. Here we propose to study the radio reconfigurability in order to provide a unique physical layer which is able to deal with all MANET applications. For implementing this reconfigurable physical layer, we propose to use Impulse Radio Ultra WideBand (IRUWB). This paper presents also our two level design approach for obtaining our reconfigurable IR-UWB receiver on FPGA (Field Programmable Gate Array).

Lecointre, Aubin; Plana, Robert

2010-01-01

459

Investigation on Stochastic Tap Delay line model of UWB indoor channel  

Microsoft Academic Search

The Stochastic Tap Delay line model of the UWB indoor channel have been used for generating Power Delay Profile (PDP). The local Power Delay profiles for different categories of channel types with range of T-R distance separation as per IEEE 802.15.4a standard have been generated. The important attributes of PDP have been selected for investigating the relative Channel behavior. The

Jyoteesh Malhotra; Ajay K. Sharma; R. S. Kaler

2008-01-01

460

Location Detection and Tracking of Moving Targets by a 2D IR-UWB Radar System.  

PubMed

In indoor environments, the Global Positioning System (GPS) and long-range tracking radar systems are not optimal, because of signal propagation limitations in the indoor environment. In recent years, the use of ultra-wide band (UWB) technology has become a possible solution for object detection, localization and tracking in indoor environments, because of its high range resolution, compact size and low cost. This paper presents improved target detection and tracking techniques for moving objects with impulse-radio UWB (IR-UWB) radar in a short-range indoor area. This is achieved through signal-processing steps, such as clutter reduction, target detection, target localization and tracking. In this paper, we introduce a new combination consisting of our proposed signal-processing procedures. In the clutter-reduction step, a filtering method that uses a Kalman filter (KF) is proposed. Then, in the target detection step, a modification of the conventional CLEAN algorithm which is used to estimate the impulse response from observation region is applied for the advanced elimination of false alarms. Then, the output is fed into the target localization and tracking step, in which the target location and trajectory are determined and tracked by using unscented KF in two-dimensional coordinates. In each step, the proposed methods are compared to conventional methods to demonstrate the differences in performance. The experiments are carried out using actual IR-UWB radar under different scenarios. The results verify that the proposed methods can improve the probability and efficiency of target detection and tracking. PMID:25808773

Nguyen, Van-Han; Pyun, Jae-Young

2015-01-01

461

A 1GS\\/s FFT\\/IFFT processor for UWB applications  

Microsoft Academic Search

In this paper, we present a novel 128-point FFT\\/IFFT processor for ultrawideband (UWB) systems. The proposed pipelined FFT architecture, called mixed-radix multipath delay feedback (MRMDF), can provide a higher throughput rate by using the multidata-path scheme. Furthermore, the hardware costs of memory and complex multipliers in MRMDF are only 38.9% and 44.8% of those in the known FFT processor by

Yu-Wei Lin; Hsuan-Yu Liu; Chen-Yi Lee

2005-01-01

462

Moderately rough surface underground imaging via short-pulse quasi-ray Gaussian beams  

Microsoft Academic Search

An adaptive framework is presented for ultra-wideband ground penetrating radar imaging of shallow-buried low-contrast dielectric objects in the presence of a moderately rough air-soil interface. The proposed approach works with sparse data and relies on recently developed Gabor-based narrow-waisted quasi-ray Gaussian beam algorithms as fast forward scattering predictive models. First, a nonlinear inverse scattering problem is solved to estimate the

Vincenzo Galdi; Haihua Feng; David A. Casta駉n; William Clem Karl; Leopold B. Felsen

2003-01-01

463

RF CMOS UWB transmitter and receiver front-end design  

E-print Network

. When integrated with the binary phase shift keying (BPSK) modulator, the transmitter front-end can generate a positive impulse with 0.8 V, negative impulse with 0.7 V, as well as the positive/negative monocycle pulse with 0.6 0.8 V, all with tunable...

Miao, Meng

2009-05-15

464

Medical Applications of Ultra-WideBand (UWB) Jianli Pan, jp10@cse.wustl.edu (A survey paper written under guidance of  

E-print Network

and Future Potential Applications 5.1 Other medical application areas of UWB 5.2 Research Directions 5 with researches in other fields such as wireless communications, radar, and medical engineering fields. Formally1 of 12 Medical Applications of Ultra-WideBand (UWB) Jianli Pan, jp10@cse.wustl.edu (A survey paper

Jain, Raj

465

All-fiber, ultra-wideband tunable laser at 2 ?m.  

PubMed

We report a direct diode-pumped all-fiber tunable laser source at 2 ?m with a tuning range of more than 250 nm. A 3 dB power flatness of 200 nm with a maximum output power of 30 mW at 1930 nm was achieved. The laser has a high optical signal-to-noise ratio (OSNR) of more than 40 dB across the whole tuning range. PMID:24322120

Li, Z; Alam, S U; Jung, Y; Heidt, A M; Richardson, D J

2013-11-15

466

Energy efficient ultra-wideband radio transceiver architectures and receiver circuits  

E-print Network

Energy efficient short-range radios have become an active research area with proliferation of portable electronics. A critical specification for radio efficiency is energy/bit. The FCC has allocated the 3.1-10.6 GHz band ...

Lee, Fred S. (Fred Shung-Neng), 1979-

2007-01-01

467

Power-efficient ultra wideband LNAs for the world's largest radio telescope  

NASA Astrophysics Data System (ADS)

This paper reports two Low Noise Amplifiers (LNA) for Aperture Array system of the international Square Kilometre Array (SKA) project. LNA design for SKA is a step change in traditional LNA design approach for radio astronomy applications as the defining aspects of performance are low noise along with low power consumption and adequate gain. The LNAs are designed, fabricated and characterised for frequency range of 20 -1000 MHz. One LNA has single ended input to single ended output configuration (LNA1) while the other LNA has balanced input to single ended output (LNA2). The S-parameter, noise figure (NF) and large signal response of the LNAs are measured at room temperature. Both LNAs show flat gain of higher than 30 dB over specified frequency range. Average NF values of LNA1 and LNA2 are 0.55 dB and 0.75 dB respectively. Mixed mode S-parameter response based on theoretical analysis of differential configuration is presented. The LNAs have exceptionally low power consumption of less than 25 mW; 20 times lower than the other reported LNAs available for the SKA and also covering complete frequency band with less than 1 dB NF. Therefore implication of these LNAs is a significant step forward as the projected number of LNAs required for the lower frequency band of SKA Aperture Array system is 5,600,000 (Dewdney et al., Proc. IEEE 97(8), 1482-1496, 2009; Faulkner et al. 2010).

Panahi, M.; Bhaumik, S.; George, D.

2014-10-01

468

Graphene as a high impedance surface for ultra-wideband electromagnetic waves  

SciTech Connect

The metals are regularly used as reflectors of electromagnetic fields emitted by antennas ranging from microwaves up to THz. To enhance the reflection and thus the gain of the antenna, metallic high impedance surfaces (HIS) are used. HIS is a planar array of continuous metallic periodic cell surfaces able to suppress surface waves, which cause multipath interference and backward radiation in a narrow bandwidth near the cell resonance. Also, the image currents are reduced, and therefore the antenna can be placed near the HIS. We demonstrate that graphene is acting as a HIS surface in a very large bandwidth, from microwave to THz, suppressing the radiation leakages better than a metal.

Aldrigo, Martino; Costanzo, Alessandra [Department of Electrical, Electronic, and Information Engineering 揋uglielmo Marconi DEI, University of Bologna, Viale del Risorgimento, 2, 40132 Bologna (Italy); Dragoman, Mircea [National Institute for Research and Development in Microtechnology (IMT), P.O. Box 38-160, 023573 Bucharest (Romania); Dragoman, Daniela [Department of Physics, University of Bucharest, P.O. Box MG-11, 077125 Bucharest (Romania)

2013-11-14

469

Accurate permittivity measurements for microwave imaging via ultra-wideband removal of spurious reflectors  

Technology Transfer Automated Retrieval System (TEKTRAN)

The use of microwave imaging is becoming more prevalent for detection of interior hidden defects in manufactured and packaged materials. In applications for detection of hidden moisture, microwave tomography can be used to image the material and then perform an inverse calculation to derive an estim...

470

Ultra-wideband microwave photonic phase shifter with configurable amplitude response.  

PubMed

We introduce a new principle that enables separate control of the amplitude and phase of an optical carrier, simply by controlling the power of two stimulated Brillouin scattering (SBS) pumps. This technique is used to implement a microwave photonic phase shifter with record performance, which solves the bandwidth limitation of previous gain-transparent SBS-based phase shifters, while achieving unprecedented minimum power fluctuations, as a function of phase shift. We demonstrate 360 continuously tunable phase shift, with less than 0.25 dB output power fluctuations, over a frequency band from 1.5 to 31 GHz, limited only by the measurement equipment. PMID:25361102

Pagani, M; Marpaung, D; Eggleton, B J

2014-10-15

471

On-chip programmable ultra-wideband microwave photonic phase shifter and true time delay unit.  

PubMed

We proposed and experimentally demonstrated an ultra-broadband on-chip microwave photonic processor that can operate both as RF phase shifter (PS) and true-time-delay (TTD) line, with continuous tuning. The processor is based on a silicon dual-phase-shifted waveguide Bragg grating (DPS-WBG) realized with a CMOS compatible process. We experimentally demonstrated the generation of delay up to 19.4 ps over 10 GHz instantaneous bandwidth and a phase shift of approximately 160 over the bandwidth 22-29 GHz. The available RF measurement setup ultimately limits the phase shifting demonstration as the device is capable of providing up to 300 phase shift for RF frequencies over a record bandwidth approaching 1 THz. PMID:25361309

Burla, Maurizio; Cort閟, Luis Romero; Li, Ming; Wang, Xu; Chrostowski, Lukas; Aza馻, Jos

2014-11-01

472

Energy-efficient analog-to-digital conversion for ultra-wideband radio  

E-print Network

In energy constrained signal processing and communication systems, a focus on the analog or digital circuits in isolation cannot achieve the minimum power consumption. Furthermore, in advanced technologies with significant ...

Ginsburg, Brian P. (Brian Paul), 1980-

2007-01-01

473

Utilizing Symmetry of Planar Ultra-Wideband Antennas for Size Reduction and Enhanced Performance  

E-print Network

With the increasingly new ultra wide-band applications, antenna researchers face huge challenges in designing novel operational geometries. Mono-pole and quasi-mono-pole antennas are seen to be the most compact and easily incorporate able solution for portable devices taking the advantages of printed circuit board (PCB) techniques. Most antennas of such type have symmetrical structures. It is possible to attain wider operating bandwidths by meeting symmetry conditions while chopping the antenna into halves for a compact structure. However, there is no generalized way of applying such a technique. The presented paper addresses this issue by proposing a common feeding technique that can be applied to any antenna which is miniaturized using its symmetrical structure. The proposed technique enables feeding the halved structure to achieve wider and better impedance matching than the reported full-size antennas. The theory of characteristic modes is applied to quasi-mono-pole structures to get an insight of the ant...

Mobashsher, Ahmed Toaha

2015-01-01

474

An ultra-wideband body area propagation channel Model-from statistics to implementation  

Microsoft Academic Search

Body worn wireless sensors for monitoring health information is a promising new application. In developing these sensors, a communication channel model is essential. However, there are currently few measurements or models describing propagation around the body. To address this problem, we have measured electromagnetic waves near the torso and derived relevant statistics. We find that components diffracting around the body

Andrew Fort; Claude Desset; P. de Doncker; P. Wambacq; L. Van Biesen

2006-01-01

475

Ultra-Wideband channel model for intra-vehicular wireless sensor networks  

Microsoft Academic Search

Intra-vehicular wireless sensor networks is a promising new research area that can provide part cost, assembly, maintenance savings and fuel efficiency through the elimination of the wires, and enable new sensor technologies to be integrated into vehicles, which would otherwise be impossible using wired means, such as Intelligent Tire. The most suitable technology that can meet high reliability, strict energy

C. Umit Bas; Sinem Coleri Ergen

2012-01-01

476

Ultra-Wideband UHF Microstrip Array for GeoSAR Application  

NASA Technical Reports Server (NTRS)

GeoSAR is a program sponsored by DARPA (Defense Advanced Research Projects Agency) and NASA (National Aeronautics and Space Administration) to develop an airborne, radar- based, commercial terrain mapping system for identification of geologic, seismic, and environmental information, it has two (dual-band at X and UHF) state-of-the-art interferometric synthetic aperture radar (SAR) ground mapping systems. The UHF interferometric system is utilized to penetrate the vegetation canopy and obtain true ground surface height information, while the Xband system will provide capability of mapping the top foliage surface. This paper presents the UHF antenna system where the required center frequency is 350 MHz with a 160 MHz of bandwidth (46% from 270 MHz to 430 MHz). The antenna is required to have dual-linear polarization with a peak gain of 10 dB at the center frequency and a minimum gain of 8 dB toward two ends of the frequency band. One of the most challenging tasks, in addition to achieving the 46% bandwidth, is to develop an antenna with small enough size to fit in the wing-tip pod of a Gulfstream II aircraft.

Thomas, Robert F.; Huang, John

1998-01-01

477

A Comprehensive Spatial-Temporal Channel Propagation Model for the Ultra-Wideband Spectrum 28 GHz  

E-print Network

, the FCC mask of -41.3 dBm/MHz EIRP in the spectrum 3.1颅10.6 GHz translates to a maximum transmission power spatial-temporal model. Specifically, the main contributions of this paper are: 路 a frequency

478

R. A. Scholtz University of Southern California UltRa Lab Ultra-Wideband Radio  

E-print Network

OneWayAttenuation(dB) Kevlar Sheet Polyethylene Paper Towel (Dry) Fiberglass Insul. concrete block painted 2x6 board 3/4"plywood 3/4" pine board wet paper towel glass drywall asphalt shingle kevlar, polystyrene dry paper to

Southern California, University of

479

A low power, high dynamic-range, broadband variable gain amplifier for an ultra wideband receiver  

E-print Network

of cross-couple transconductors multiplier ........................ 15 Fig 2.8 Differential pair with source degeneration ................................................. 16 Fig 2.9 Complementary differential pair with source degeneration... differential pairs with source degeneration as its input transconductor to convert the input voltage into current, then a programmable current mirror as its current gain stage to further amplify the current, and fixed load resistors to provide the linear...

Chen, Lin

2007-09-17

480

ORAL PRESENTATION ABSTRACT Antenna Array Design for Ultra-wideband Microwave Detection of Breast Cancer Tumours  

E-print Network

in literature that cancerous tissue in the breast exhibits separate dielectric properties than normal breast microwave antenna which must serve as an element in a sensor array for early-stage breast-cancer detection tomography, breast cancer detection, breast phantom, phantom fabrication #12;

Haykin, Simon

481

Small High Performance Ultra Wideband UHF Multipurpose Planar Antenna A. Babar* (1)  

E-print Network

. As the antenna is made of a simple microstrip structure [5], it can be embedded and integrated in various small, with no copper on the opposite side of the antenna structure of the PCB. The copper underneath the antenna system. As the antenna structure is not shorted with the ground plane like PIFA [7], it becomes less

Elsherbeni, Atef Z.

482

An analog approach to interference suppression in ultra-wideband receivers  

E-print Network

of the interference, and includes a Least Means Squared (LMS) tuning scheme to maximize attenuation. The filter uses the Fast Fourier Transform (FFT) result for interference detection and discrete center frequency tuning of the filter. It was fabricated in a 0.18 ...

Fischer, Timothy W.

2007-09-17

483

Short range, ultra-wideband radar with high resolution swept range gate  

DOEpatents

A radar range finder and hidden object locator is based on ultra-wide band radar with a high resolution swept range gate. The device generates an equivalent time amplitude scan with a typical range of 4 inches to 20 feet, and an analog range resolution as limited by a jitter of on the order of 0.01 inches. A differential sampling receiver is employed to effectively eliminate ringing and other aberrations induced in the receiver by the near proximity of the transmit antenna, so a background subtraction is not needed, simplifying the circuitry while improving performance. Uses of the invention include a replacement of ultrasound devices for fluid level sensing, automotive radar, such as cruise control and parking assistance, hidden object location, such as stud and rebar finding. Also, this technology can be used when positioned over a highway lane to collect vehicle count and speed data for traffic control.

McEwan, Thomas E. (Livermore, CA)

1998-05-26

484

Short range, ultra-wideband radar with high resolution swept range gate  

DOEpatents

A radar range finder and hidden object locator is based on ultra-wide band radar with a high resolution swept range gate. The device generates an equivalent time amplitude scan with a typical range of 4 inches to 20 feet, and an analog range resolution as limited by a jitter of on the order of 0.01 inches. A differential sampling receiver is employed to effectively eliminate ringing and other aberrations induced in the receiver by the near proximity of the transmit antenna, so a background subtraction is not needed, simplifying the circuitry while improving performance. Uses of the invention include a replacement of ultrasound devices for fluid level sensing, automotive radar, such as cruise control and parking assistance, hidden object location, such as stud and rebar finding. Also, this technology can be used when positioned over a highway lane to collect vehicle count and speed data for traffic control. 14 figs.

McEwan, T.E.

1998-05-26

485

Universal transmitter for wireless and optical access converged networks  

NASA Astrophysics Data System (ADS)

The integration of ultra-wideband (UWB)-over- ber into passive optical network (PON) is of great interest as it bene ts the high bandwidth capability from optical network technologies and the high exibility from wireless network technologies. The later can only be done with a reasonable cost when a universal optical transmitter, which is capable of generation both UWB and PON signals, is available. Direct modulation of semiconductor laser was demonstrated to be suitable for high bit-rate PON systems, however the generation of UWB signals by this technique is still challenging. Using the chirp properties of directly modulated semiconductor lasers, UWB signals are generated. Di erent UWB signal waveforms and polarities are obtained. The received electrical spectra conform to the requirements of indoor UWB systems.

Le, Quang T.; K黳pers, Franko

2013-12-01

486

All-weather perception for small autonomous UGVs  

Microsoft Academic Search

For the TARDEC-funded Daredevil Project, iRobot Corporation is developing capabilities that will allow small UGVs to navigate autonomously in adverse weather and in foliage. Our system will fuse sensor data from ultra wideband (UWB) radar, LIDAR, stereo vision, GPS, and INS to build maps of the environment showing which areas are passable (e.g. covered by tall grass) and which areas

Brian Yamauchi

2008-01-01

487

Opportunity and benefits of monitoring of the electromagnetic environment of a planet  

Microsoft Academic Search

For monitoring and mapping of the electromagnetic (e.m.) environment of a planet, e.g. the Earth, it is necessary an advanced recording and data processing technology onboard of space vehicles and an accurate theory of the propagation of ultra-wideband (UWB) signals in inhomogeneous and magnetised media in free space and in guided modes. In this prsentation the actual application of this

Cs. Ferencz; J. Lichtenberger; O. E. Ferencz; P. Steinbach

2006-01-01

488

A design and adjustment method for ultrawideband microstrip antenna design  

Microsoft Academic Search

This paper presents a combined theoretical and experimental design and adjustment method for ultra-wideband (UWB) microstrip antennas with new geometries on the radiofrequency printed circuit board (PCB) with the permittivity er=2.3 and the thickness h=1mm. The first theoretical design is made by using a standard 3D electromagnetic software package. The antenna specifications are measured and adjusted by the equipment Microwave

Hong Phuong Phan; Dat Son Nguyen

2010-01-01

489

Wideband VGAs Using a CMOS Transconductor in Triode region  

Microsoft Academic Search

Wideband variable gain amplifiers (VGAs) fabricated using 0.18 mum CMOS process are presented. A scheme with a CMOS triode transconductor is proposed to achieve linear-in-dB characteristics of VGAs for ultra wideband (UWB) systems. The implemented transmitter (TX) VGA shows a highly linear gain range of 28.4 dB (7 dB to -21.4 dB) and a bandwidth of 1200 MHz, while drawing

Hui Dong Lee; Kyung Ai Lee; Songcheol Hong

2006-01-01

490

Microwave Tumor Detection Using a Flexible UWB Elliptical Slot Antenna with a Tuning Uneven U-shape Stub on LCP  

E-print Network

-shape Stub on LCP Negar Tavassolian *, Symeon Nikolaou, and Manos M. Tentzeris GEDC, School of ECE, Georgia-shape Stub on flexible liquid crystal polymer (LCP) in the UWB Microwave range of frequencies. The software-fed Elliptical slot antenna on LCP was designed in [3] and is used in our work as the radiator for microwave

Tentzeris, Manos

491

COMPACT ANTENNAS FOR UWB APPLICATIONS Taeyoung Yang, Seong-Youp Suh, Randall Nealy, William A. Davis, and Warren L. Stutzman  

E-print Network

COMPACT ANTENNAS FOR UWB APPLICATIONS Taeyoung Yang, Seong-Youp Suh, Randall Nealy, William A. Davis, and Warren L. Stutzman Virginia Tech Antenna Group, Bradley Dept. of Elec. & Comp. Engineering-disc antennas in the frequency and time domains with the objective of developing small planar versions

Arslan, H眉seyin

492

A Novel Class of Algorithms for Timing Acquisition of Differential Transmitted Reference UWB Receivers: Architecture, Performance Analysis and System Design  

Microsoft Academic Search

This paper deals with the analysis of the timing acquisition (synchronization) process in Impulse Radio (IR-) Ultra Wide Band (UWB) systems based on Differential Transmitted Reference (DTR) receiver architectures. The fundamental contribution includes a theoretical framework for timing acquisition analysis, which is not only able to describe the first moment (Mean Acquisition Time, MAT), and the second moment (standard deviation

Marco Di Renzo; Luca Alfredo Annoni; Fabio Graziosi; Fortunato Santucci

2008-01-01

493

UWB short range radar for road applications L. Sakkila*, C. Tatkeu**, A. Rivenq*, Y. El Hillali*, J-M. Rouvaen*  

E-print Network

1 UWB short range radar for road applications L. Sakkila*, C. Tatkeu**, A. Rivenq*, Y. El Hillali'Ascq Corresponding author. E-mail:laila.sakkila@gmail.com Abstract In this paper, a short range radar system based, the radar and its applications were reserved to national defence, air security domains or weather services

Paris-Sud XI, Universit茅 de

494

Biological channel modeling and implantable UWB antenna design for neural recording systems.  

PubMed

Ultrawideband (UWB) short-range communication systems have proved to be valuable in medical technology, particularly for implanted devices, due to their low-power consumption, low cost, small size, and high data rates. Neural activity monitoring in the brain requires high data rate (800爇b/s per neural sensor), and we target a system supporting a large number of sensors, in particular, aggregate transmission above 430 Mb/s (?512 sensors). Knowledge of channel behavior is required to determine the maximum allowable power to 1) respect ANSI guidelines for avoiding tissue damage, and 2) respect FCC guidelines on unlicensed transmissions. We utilize a realistic model of the biological channel to inform the design of antennas for the implanted transmitter and the external receiver under these requirements. Antennas placement is examined under two scenarios having contrasting power constraints. Performance of the system within the biological tissues is examined via simulation and experiment. Our miniaturized antennas, 12 mm 12 mm, need worst-case receiver sensitivities of -38 and -30.5 dBm for the first and second scenarios, respectively. These sensitivities allow us to successfully detect signals transmitted through tissues in the 3.1-10.6-GHz UWB band. PMID:25055379

Bahrami, Hadi; Mirbozorgi, S Abdollah; Rusch, Leslie A; Gosselin, Benoit

2015-01-01

495

Influence of the organism interface on the breast cancer detection by UWB  

NASA Astrophysics Data System (ADS)

Ultra-wide band (UWB) imaging technique is very attractive for the early breast cancer detection based on the obvious contrast in the electrical properties of malignant tumor to the normal fatty breast tissue. The tumor can be detected by analyzing the reflecting and scattering behavior of the UWB microwaves propagating in the breast. In this study, the influence of the organism interfaces is investigated from different cases of breast configuration involving different gland shapes as well as the tumor locations. Results show that the gland structure and tumor status have large influences on the reconstructed images generated from the detected signals due to the interface varieties. The tumor information in the proposed configurations can be obtained by series signal processing including eliminating the early time response of the detected signals caused by the direct wave and the reflection from the interface between the skin and the breast fat, and compensating the path loss of the propagating signal due to the radial spreading and the attenuation in the lossy breast. The location and the number of emitters and detectors affect the quality of the reconstructed image.

Xiao, Xia; Kikkawa, Takamaro

2008-11-01

496

Characterization of UWB Antennas by Their Spatio-Temporal Transfer Function Based on FDTD Simulations  

NASA Astrophysics Data System (ADS)

In this paper we present a method for the efficient characterization of UWB antennas based on a combination of FDTD simulation and the Lorentz reciprocity principle. A complete spatio-temporal characterization can be optained by employing a methods consisting of a numerical simulation of the near field and a near field to far field transformation. In a first step a single numerical simulation in a small near field region is used to compute the electrical field of the antenna in transmit mode. A near field to far field transformation provides the transmit transfer function of the antenna. The application of the Lorentz reciprocity theorem then yields the receive transfer function from the transmit transfer function. The transfer functions of the antenna allow the calculation of all quality measures of interest (e. g. ringing or effective gain) either in the frequency domain or the time domain. Furthermore, as the transfer functions characterize completely the spatio-temporal behavior of the antenna they can be used as input data for propagation investigations in order to investigate the link between a transmitting and a receiving UWB system. The proposed method is validated by a comparison of its results with an EMPIRE FDTD simulation of a two antenna system. To investigate a first realistic example a monocone antenna integrated in a canonical model of a DVD player is characterized, and the link between the DVD player and a Vivaldi antenna is calculated for a simplified indoor scenario.

Manteuffel, D.; Kunisch, J.; Simon, W.

497

Pulsed power  

NASA Astrophysics Data System (ADS)

Pulsed power systems are critical elements for such prospective weapons technologies as high-power microwaves, electrothermal and electromagnetic projectile launchers, neutral particle beams, space-based FELs, ground-based lasers, and charged particle beams. Pulsed power will also be essential for the development of nonweapon military systems such as lidars and ultrawideband radars, and could serve as the bases for nuclear weapon effect simulators. The pulsed power generation requirements for each of these systems is considered.

Stone, David H.

498

IEEE Vehicular Technology Conference, pp. 1654-1658, April 2003, Jeju, Korea On the Performance of Bi-Phase Modulated UWB  

E-print Network

the antenna. The FCC definition of a UWB signal is such that the fractional bandwidth1 is equal to or greater constellation and predicted the bi-phase modulation (BPM), precisely speaking binary phase shift modulation

Ha, Dong S.

499

Pulse oximetry  

PubMed Central

Pulse oximetry is one of the most commonly employed monitoringmodalities in the critical care setting. This review describes the latesttechnological advances in the field of pulse oximetry. Accuracy of pulseoximeters and their limitations are critically examined. Finally, the existingdata regarding the clinical applications and cost-effectiveness of pulseoximeters are discussed. PMID:11094477

Jubran, Amal

1999-01-01

500

SEMICONDUCTOR INTEGRATED CIRCUITS: A 3.1-4.8 GHz transmitter with a high frequency divider in 0.18 ?m CMOS for OFDM-UWB  

NASA Astrophysics Data System (ADS)

A fully integrated low power RF transmitter for a WiMedia 3.1-4.8 GHz multiband orthogonal frequency division multiplexing ultra-wideband system is presented. With a separate transconductance stage, the quadrature up-conversion modulator achieves high linearity with low supply voltage. The co-design of different resonant frequencies of the modulator and the differential to single (D2S) converter ensures in-band gain flatness. By means of a series inductor peaking technique, the D2S converter obtains 9 dB more gain without extra power consumption. A divided-by-2 divider is used for carrier signal generation. The measurement results show an output power between -10.7 and -3.1 dBm with 7.6 dB control range, an OIP3 up to 12 dBm, a sideband rejection of 35 dBc and a carrier rejection of 30 dBc. The ESD protected chip is fabricated in the Jazz 0.18 ?m RF CMOS process with an area of 1.74 mm2 and only consumes 32 mA current (at 1.8 V) including the test associated parts.

Renliang, Zheng; Junyan, Ren; Wei, Li; Ning, Li

2009-12-01