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1

Recent system applications of short-pulse ultra-wideband (UWB) technology  

Microsoft Academic Search

Developed in the early 1960s, time-domain electromagnetics, the study of electromagnetic-wave propagation from a time-domain perspective, has given birth to a fascinating new technology, which today is commonly referred to as ultra-wideband (UWB). It has now been slightly more than 25 years since the 1978 seminal paper of Bennett and Ross, which summarized UWB's early applications. It thus seems appropriate,

Robert J. Fontana

2004-01-01

2

An Ultra-Wideband (UWB) pulse dispersion study for antennas in sensor network applications  

Microsoft Academic Search

UWB pulse dispersion studies performed with antennas aligned in a linear co-polarized fashion are inadequate for many sensor network applications, as the antennas may in practice have arbitrary orientations with respect to each other. Variations of the pulse response at different antenna orientations may significantly affect data integrity. In this work it was found that a circular monopole geometry performed

Q. Bonds; T. Weller; H. Arslan

2007-01-01

3

A novel ultra-wideband pulse design algorithm  

Microsoft Academic Search

We present a new algorithm to numerically generate pulses that not only have a short time duration for multiple access, but also meet the power spectral constraint of Federal Communications Commission (FCC) ultra-wideband (UWB) mask. In fact, applying our algorithm to the FCC spectral mask for UWB systems can lead to the design of multiple orthogonal pulses that are compliant.

Brent Parr; ByungLok Cho; K. Wallace; Zhi Ding

2003-01-01

4

Decision directed autocorrelation receivers for pulsed ultra-wideband systems  

Microsoft Academic Search

The need for effective capture of multipath energy presents a key challenge to receiver design for pulsed ultra- wideband (UWB) systems operating in non-line-of-sight propa- gation environments. Conventional RAKE receivers can capture only a fraction of the received signal energy under practical implementation constraints, and have to deal with stringent synchronization and channel estimation requirements. Transmit- reference and autocorrelation receivers

Shiwei Zhao; Huaping Liu; Zhi Tian

2006-01-01

5

Human detection and tracking via Ultra-Wideband (UWB) radar  

Microsoft Academic Search

This paper presents an algorithm for human presence detection and tracking using an Ultra-Wideband (UWB) impulse-based mono-static radar. UWB radar can complement other human tracking technologies, as it works well in poor visibility conditions. UWB electromagnetic wave scattering from moving humans forms a complex returned signal structure which can be approximated to a specular multi-path scattering model (SMPM). The key

SangHyun Chang; Michael T. Wolf; Joel W. Burdick

2010-01-01

6

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

7

Ultra-wideband (UWB) geolocation in NLOS multipath fading environments  

Microsoft Academic Search

Geolocation aware services are becoming attractive with the deployment of next generation wireless networks and broadband multimedia wireless networks (i.e. ubiquitous and pervasive computing) especially in indoor and campus areas. In order to construct an ad-hoc network the upcoming ultra-wideband (UWB) radio technology holds great promise for revolutionizing wireless communications especially in indoor environments (office, residential, industrial). The two proposals

R. A. Saeed; S. Khatun; B. M. Ali; M. A. Khazani

2005-01-01

8

A Power-Efficient Ultra-Wideband Pulse Generator Based on Multiple PM-IM Conversions  

Microsoft Academic Search

A novel photonic generation of power-efficient ultra-wideband (UWB) pulse by incoherent summation of two asymmetric monocycle pulses with inverted polarities is experimentally demonstrated. The principles of multiple cross-phase modulations in a highly nonlinear fiber and multiple phase modulation to intensity modulation conversions in a commercially available arrayed-waveguide grating are used. The combined UWB pulse exploiting spectral efficiency of 50.59% in

Enbo Zhou; Xing Xu; King-Shan Lui; Kenneth Kin-Yip Wong

2010-01-01

9

Ultra-Wideband (UWB) Bandpass Filter With Embedded Band Notch Structures  

Microsoft Academic Search

A compact ultra-wideband (UWB) bandpass filter (BPF) with narrow notched (rejection) band in the UWB passband realized on a microstrip line is implemented and presented in this letter for use in wireless communication applications within the unlicensed UWB range set by the Federal Communications Commission (FCC). The filter consists of five short-circuited stubs separated by nonredundant connecting lines in order

Hussein Shaman; Jia-Sheng Hong

2007-01-01

10

Development of band pass filter for ultra wideband (UWB) communication systems  

Microsoft Academic Search

This paper presents a band pass filter for ultra wideband (UWB) communication systems. The Federal Communication Commission (FCC) authorized the commercial use of the UWB technology in February 2002. Where, the frequency range of the spectrum mask in an indoor environment is from 3.1 GHz to 10.6 GHz. To transmit digital information on the maximum of 1 Gbps using this

A. Saito; H. Harada; A. Nishikata

2003-01-01

11

Ultra-wideband antennas for combined magnetic resonance imaging and UWB radar applications  

Microsoft Academic Search

Magnetic resonance imaging (MRI) is one of the most highly appreciated medical diagnostic techniques worldwide. Recent developments aim at adding the capability of creating focused images of moving objects. Among the potential navigator techniques required for such an improved MRI is ultra-wideband (UWB) radar. We have studied the performance of UWB antennas for biomedical imaging inside the 3-Tesla MRI system

U. Schwarz; F. Thiel; F. Seifert; R. Stephan; M. Hein

2009-01-01

12

Challenges for ultra-wideband (UWB) CMOS integration  

Microsoft Academic Search

Various methods of utilizing the UWB spectrum have been developed to date, characterized by specific modulation schemes, such as pulse position, pulse amplitude or bi-phase modulation. A new method emerging today utilizes a multi-band approach, where information is encoded in multiple RF subbands at staggered time, each occupying 500MHz bandwidth. A description of multi-band modulation schemes for UWB is included

G. Roberto Aiello

2003-01-01

13

A low-power high-speed ultra wideband pulse radio system  

Microsoft Academic Search

We present a low-power high-speed ultra-wideband (UWB) pulse radio transmission test platform. The transmitter circuit is fabricated on the Peregrine semiconductors 0.5 micron silicon-on-sapphire (SOS) CMOS process and packaged in a DIP16 package. 12.5 Mbps data rate of wireless transmission is achieved. The power consumption of the transmitter is 10 mW when the pulse rate is 90 MHz. The core

Wei Tang; Eugenio Culurciello

2009-01-01

14

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

15

An ultra-wideband transmitter based on a new pulse generator  

Microsoft Academic Search

The paper describes an ultra-wideband transmitter, which incorporates an innovative carrier-based pseudo-Gaussian pulse generator satisfying FCC rules with no-filter and high spectral efficiency. The design includes a BPSK modulator, a ramp generator and an output buffer. The transmitter is designed for run up to 500 Mpps in the UWB 3-5-GHz band and it is implemented in 0.28-mum CMOS technology with

Marco Cavallaro; Egidio Ragonese; Giuseppe Palmisano

2008-01-01

16

A Low-Power High-Speed Ultra-Wideband Pulse Radio Transmission System  

Microsoft Academic Search

We present a low-power high-speed ultra-wideband (UWB) transmitter with a wireless transmission test platform. The system is specifically designed for low-power high-speed wireless implantable biosensors. The integrated transmitter consists of a compact pulse generator and a modulator. The circuit is fabricated in the 0.5-mum silicon-on-sapphire process and occupies 420 mum times 420 mum silicon area. The transmitter is capable of

Wei Tang; Eugenio Culurciello

2009-01-01

17

Ultra-wideband, short-pulse ground-penetrating radar: simulation and measurement  

Microsoft Academic Search

Ultra-wideband (UWB), short-pulse (SP) radar is investigated theoretically and experimentally for the detection and identification of targets buried in and placed atop soil. The calculations are performed using a rigorous, three-dimensional (3D) method of moments algorithm for perfectly conducting bodies of revolution. Particular targets investigated theoretically include anti-personnel mines, anti-tank mines, and a 55-gallon drum, for which the authors model

Stanislav Vitebskiy; Lawrence Carin; Marc A. Ressler; Francis H. Le

1997-01-01

18

Timing synchronization for ultra-wideband (UWB) multi-band OFDM systems  

Microsoft Academic Search

An algorithm based on distinguishing the first significant multipath (FTA) is proposed to address the critical issue of symbol timing synchronization in Ultra wideband (UWB) Multi-band OFDM (MB-OFDM) systems. The algorithm attempts to locate the frame synchronization sequence and pinpoint the exact start of the Fast Fourier Transform (FFT) window by first accumulating multipath energies and then discerning for first

Chin Wee Yak; Zhongding Lei; S. Chattong; Thiang Tjeng Tjhung

2005-01-01

19

Timing synchronization and frequency offset estimation for Ultra-Wideband (UWB) MultiBand OFDM systems  

Microsoft Academic Search

An algorithm based on distinguishing the first significant multipath (FTA) is proposed to address the critical issue of symbol timing synchronization and carrier frequency offset estimation in ultra wideband (UWB) multi-band OFDM (MB-OFDM) systems. FTA pinpoints the frame synchronization sequence and the start of its fast Fourier transform (FFT) window by accumulating multipath energies and then discerning for first significant

Chin Wee Yak; Zhongding Lei; S. Chattong; Tjeng Thiang Tjhung

2005-01-01

20

Ultra-wideband pulse generation with flexible pulse shape and polarity control using a Sagnac-interferometer-based intensity modulator.  

PubMed

We propose a novel scheme to generate ultra-wideband (UWB) pulse by employing a Sagnac interferometer comprising a phase modulator. This structure performs a dual-input and dual-output intensity modulator (IM), ultimately resulting in the flexibility to select the shape and the polarity of the generated UWB pulse. The experiment results show a good agreement with the theoretical investigation in terms of both pulse profile and spectrum, which conforms to the definition of UWB signals by the U.S. Federal Communications Commission. Furthermore, the proposed scheme is independent of the voltage bias point. PMID:19551113

Li, Jianqiang; Xu, Kun; Fu, Songnian; Wu, Jian; Lin, Jintong; Tang, Ming; Shum, P

2007-12-24

21

A photonic ultra-wideband pulse generator based on relaxation oscillations of a semiconductor laser.  

PubMed

A photonic ultra-wideband (UWB) pulse generator based on relaxation oscillations of a semiconductor laser is proposed and experimentally demonstrated. We numerically simulate the modulation response of a direct modulation laser (DML) and show that due to the relaxation oscillations of the laser, the generated signals with complex shape in time domain match the Federal Communications Commission (FCC) mask in the frequency domain. Experimental results using a DML agree well with simulation predictions. Furthermore, we also experimentally demonstrate the generation of FCC compliant UWB signals by externally injecting a distributed feedback (DFB) laser. PMID:19506617

Yu, Xianbin; Braidwood Gibbon, Timothy; Pawlik, Michal; Blaaberg, Søren; Tafur Monroy, Idelfonso

2009-06-01

22

An ultra-wideband monocycle pulse generator with good performance  

Microsoft Academic Search

A new ultra-wideband monocycle pulse generator with good performance is designed and demonstrated. The pulse generator circuits employ SRD(step recovery diode), Schottky diode, and simple RC coupling and decoupling circuit, and are completely fabricated on the planar microstrip structure, which have the characteristic of low cost and small size. Through SRD modeling, the accuracy of the simulation is improved, which

Zhong Li; Xin-Xin Lv; Yun-Fu Long; Tian Qin

2011-01-01

23

Filter-free ultra-wideband doublet pulses generation based on wavelength conversion and fiber dispersion effect  

NASA Astrophysics Data System (ADS)

Filter-free ultra-wideband (UWB) doublet pulse generation is experimentally demonstrated in the optical domain based on cross-gain modulation (XGM) in semiconductor optical amplifier (SOA) and UWB-over-fiber technology is implemented by exploiting dispersion-induced pulse broadening effect in single-mode fiber (SMF). In our proposed system, the SOA generates a polarity-inversed Gaussian pulse train with respect to the injected one through the XGM. After a piece of SMF, the bandwidth of polarity-reversed Gaussian pulse broadens due to the induced dispersion. After the combination of the two light waves with a suitable time delay between them, UWB pulse is obtained. The key parameters for UWB pulse, including central frequency, 10 dB bandwidth, as well as fractional bandwidth are experimentally obtained with 8 GHz, 9.9 GHz and 123% respectively. The generated UWB doublet pulse conforms with the UWB definition of Federal Communications Commission (FCC).

Shao, Jing; Sun, Junqiang

2012-06-01

24

An integrated 3.1-5.1 GHz pulse generator for ultra-wideband wireless localization systems  

Microsoft Academic Search

This paper presents an implementation of an integrated Ultra-wideband (UWB), Binary-Phase Shift Keying (BPSK) Gaussian modulated pulse generator. VCO, multiplier and passive Gaussian filter are the key components. The VCO provides the carrier frequency of 4.1 GHz, the LC Gaussian filter is responsible for the pulse shaping in the baseband. Multiplying the baseband pulse and the VCO frequency shifts the

X. Fan; G. Fischer; B. Dietrich

2006-01-01

25

Study on Satellite Communications using Ultra Wideband (UWB) Signals  

Microsoft Academic Search

In this paper, the possibility of satellite communication systems using a multiband UWB signal format is considered. For terrestrial short-distance high-speed communications, multiband UWB schemes are proposed in IEEE 802.15 TG3a and the discussion is ongoing at the standardization body. In the multiband UWB scheme, frequency hopping is adopted over 3.1 - 10.6 GHz, which is regulated by the FCC

Yoshio KUNISAWA Hiroyasu ISHIKAWA; Hisato IWAI; Hideyuki SHINONAGA

26

FDTD computation of human eye exposure to ultra-wideband electromagnetic pulses.  

PubMed

With an increase in the application of ultra-wideband (UWB) electromagnetic pulses in the communications industry, radar, biotechnology and medicine, comes an interest in UWB exposure safety standards. Despite an increase of the scientific research on bioeffects of exposure to non-ionizing UWB pulses, characterization of those effects is far from complete. A numerical computational approach, such as a finite-difference time domain (FDTD) method, is required to visualize and understand the complexity of broadband electromagnetic interactions. The FDTD method has almost no limits in the description of the geometrical and dispersive properties of the simulated material, it is numerically robust and appropriate for current computer technology. In this paper, a complete calculation of exposure of the human eye to UWB electromagnetic pulses in the frequency range of 3.1-10.6, 22-29 and 57-64 GHz is performed. Computation in this frequency range required a geometrical resolution of the eye of 0.1 mm and an arbitrary precision in the description of its dielectric properties in terms of the Debye model. New results show that the interaction of UWB pulses with the eye tissues exhibits the same properties as the interaction of the continuous electromagnetic waves (CWs) with the frequencies from the pulse's frequency spectrum. It is also shown that under the same exposure conditions the exposure to UWB pulses is from one to many orders of magnitude safer than the exposure to CW. PMID:18367803

Simicevic, Neven

2008-03-07

27

Atmospheric distortions of ultra-wideband pulses: method of temporal moments  

Microsoft Academic Search

Results of numerical simulation of ultra-wideband electromagnetic pulses distortions in the Earth atmosphere using the concept of temporal moments are presented. The relative broadening, the skewness, and the kurtosis of the ultra-wideband pulses as functions of a distance from source to the point of observation are computed under standard atmospheric conditions. Generalization of the form of ultra-wideband pulse radiated by

A. M. Stadnik; G. V. Ermakov

2000-01-01

28

FDTD analysis of a gigahertz TEM cell for ultra-wideband pulse exposure studies of biological specimens  

Microsoft Academic Search

Gigahertz transverse electromagnetic (GTEM) transmission cells have been previously used to experimentally study exposure of biological cells to ultra-wideband (UWB), monopolar, electromagnetic pulses. Using finite-difference time-domain (FDTD) simulations we examine the time-dependent electric field waveforms and energy dose spatial distributions within a finite volume of biological cell culture medium during these experiments. The simulations show that when one or more

Zhen Ji; C. Hagness; H. Booske; Satnam Mathur; Martin L. Meltz

2006-01-01

29

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

30

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

31

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

32

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

33

A new UWB pulse generator for FCC spectral masks  

Microsoft Academic Search

We present a pulse design algorithm for acquiring a set of orthogonal ultra-wideband (UWB) impulses with limited time duration subject to a pre-selected frequency mask. The proposed algorithm is simple and numerically sound. The designed UWB pulse shapes are shown to satisfy the recent FCC specification on UWB radio frequency constraints.

A. B. Parr; B. L. Cho; Z. Ding

2003-01-01

34

Low power complementary-colpitts self-quenched super-regenerative ultra-wideband (UWB) bandpass filter in CMOS technology  

Microsoft Academic Search

This paper presents the complementary colpitts self-quenched super-regenerative ultra-wideband (UWB) bandpass filter for low power, low cost and medium data rate wireless communication systems. The high gain, large bandwidth and low power consumption are the attractive properties of self-quenched super-regenerative filters for UWB systems. The bandwidth of 1.5 GHz across the central frequency of 7.5 GHz is measured for complementary

M. Anis; R. Tielert; N. Wehn

2008-01-01

35

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

36

Cognitive Pulse Shaping for Mary Direct Sequence BPAM UWB System  

Microsoft Academic Search

In this paper, based on a new pulse waveform design algorithm of ultra wideband pulse (Parr et al., 2003), we employ this algorithm into a cognitive M-ary code selected direct sequence bipolar pulse amplitude modulation ultra wideband communication system. This M-ary DS-UWB system can utilize the cognitive waveform to realize the high performance and high data rate cognitive communication. The

Zhiquan Bai; Dongfeng Yuan; Haixia Zhang; Kyungsup Kwak

2008-01-01

37

Ultra-wideband Communications  

SciTech Connect

Many applications in wireless communications often require short-range systems capable of rapidly collecting data and transmitting it reliably. Commercial communication systems operate in fixed frequency bands and are easily detectable and are prone to jamming by the enemy, among other shortcomings. The new ultra-wideband (UWB) communications system in the 3.1 to 10 GHz band is of significant interest to a number of Lawrence Livermore National Laboratory (LLNL) programs including the Nonproliferation, Arms Control, and International Security (NAI) Directorate. Ultra-Wideband (UWB) technology has received a significant degree of attention from communications industry since the Federal Communications Commission (FCC) rulings in February 2002. According to FCC, UWB signals have fractional bandwidth (B{sub f}) of 20% or larger at -10 dB cut-off frequencies, with minimum bandwidth of 500 MHz. Unlike traditional communication systems, UWB systems modulate carrier-less, short-duration (picosec to nanosec) pulses to transmit and receive information. A number of programmatic problems at LLNL, particularly in the NAI and other national security Directorates, require collecting information from multiple sensors distributed over a local area. The information must be collected covertly and by wireless means. The sensors produce data using low power devices and the communication link must operate in severe multipath environments over tens of meters; often the links must be channelized to handle multiple sensors. The communications links between these sensors is a critical issue in the development of LLNL programs to demonstrate distributed sensor network performance in real-time. In summary, such systems must be robust; have a low probability of detection and intercept; employ low-power, small-size hardware; and interface easily with other systems for analysis or to establish long-distance links. The purpose of this work was to develop a new UWB radio-frequency (RF) communications system for the UWB RF band. In this project we addressed the need for robust UWB communication systems with low-power, small-size sensor communication hardware. Our research results have successfully addressed these issues and we developed UWB radios and interfaced these radios with repeater radios for longer distance links. In particular, research and development challenges included signal processing and communication design problems, including developing novel UWB modulation and demodulation schemes, link budget analysis for ultra-wideband signals, multipath mitigation, short-pulse signal synchronization, and building real working radios. We have had a significant degree of success in solving these technical challenges. As a result, several programmatic efforts have spun off from our R&D work in FY04.

Waltjen, K; Romero, C; Azevedo, S; Dowla, F; Spiridon, A; Benzel, D; Haugen, P

2004-02-06

38

Two-Step Time of Arrival Estimation for Pulse-Based Ultra-Wideband Systems  

Microsoft Academic Search

In cooperative localization systems, wireless nodes need to exchange accurate position-related information such as time-of-arrival (TOA) and angle-of-arrival (AOA), in order to obtain accu- rate location information. One alternative for providing accurate position-related information is to use ultra-wideband (UWB) signals. The high time resolution of UWB signals presents a potential for very accurate positioning based on TOA estimation. However, it

Sinan Gezici; Zafer Sahinoglu; Andreas Molisch; Hisashi Kobayashi; H. Vincent Poor

2009-01-01

39

Ultra-wideband radar using Fourier synthesized waveforms  

Microsoft Academic Search

Traditional methods of ultra-wideband (UWB) radar signal generation suffer from several disadvantages such as low antenna radiation efficiency and lack of accurate control of signal parameters like pulse shape, pulse repetition interval (PRI), and its spectrum. UWB signals can be generated by expanding the desired radar waveform in a Fourier series and then synthesizing the waveform by generating the individual

Gurnam Singh Gill

1997-01-01

40

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

2011-05-01

41

Ultra wideband DSSS for multiple access communications using antipodal signaling  

Microsoft Academic Search

Ultra wideband (UWB) technology is characterized by transmitting extremely short duration radio impulses. To improve its multiple access (MA) capability, UWB technology can be combined with traditional spread spectrum techniques. So far, much of the research has focused on employing time hopping spread spectrum with impulse radio using pulse position modulated (PPM) signals. In this paper, we outline the attractive

N. Boubaker; K. B. Letaief

2003-01-01

42

Commercialization of an ultra wideband precision asset location system  

Microsoft Academic Search

Ultra wideband (UWB) technology has been shown to possess unique advantages for precision localization applications. The use of short pulse RF waveforms provides inherent precision for time difference of arrival measurements, as well immunity to multipath effects in indoor applications. This paper describes an FCC-approved, commercial UWB precision asset location system which is being used for tracking of high valued

Robert J. Fontana; Edward Richley; JoAnn Barney

2003-01-01

43

Acquisition of direct-sequence ultra-wideband signals  

Microsoft Academic Search

Very high rate packet data systems, such as those based on ultra-wideband (UWB) signaling, face an increasingly important challenge - achieving fast timing acquisition and synchronization (which must be done typically on an individual packet basis) to minimize preamble overhead and optimize (packet) throughput. Impulse based UWB modulation schemes use short (nano-second) time-duration pulses that are appropriately shaped - the

Iyappan Ramachandran; Sumit Roy

2005-01-01

44

An integrated 3.1-5.1 GHz pulse generator for ultra-wideband wireless localization systems  

NASA Astrophysics Data System (ADS)

This paper presents an implementation of an integrated Ultra-wideband (UWB), Binary-Phase Shift Keying (BPSK) Gaussian modulated pulse generator. VCO, multiplier and passive Gaussian filter are the key components. The VCO provides the carrier frequency of 4.1 GHz, the LC Gaussian filter is responsible for the pulse shaping in the baseband. Multiplying the baseband pulse and the VCO frequency shifts the pulse to the desired center frequency. The generated Gaussian pulse ocupppies the frequency range from 3.1 to 5.1 GHz with the center frequency at 4.1 GHz. Simulations and measured results show that this spectrum fulfills the mask for indoor communication systems given by the FCC (Federal Communications Commission, 2002). The total power consumption is 55 mW using a supply voltage of 2.5 V. Circuits are realized using the IHP 0.25 ?m SiGe:C BiCMOS technology.

Fan, X.; Fischer, G.; Dietrich, B.

2006-09-01

45

Medical applications of the Ultra Wideband technology  

Microsoft Academic Search

In this paper the application of the Ultra Wideband technology in the medical field is investigated. This is done by presenting a mathematical description of the Ultra Wideband medical scenario and a model of the human body. Besides, the requirements of antennas for Ultra Wideband medical applications are discussed. The most important existing applications of the UWB technology in the

Elena Pancera

2010-01-01

46

Detection of obscured targets in heavy-tailed radar clutter using an ultra-wideband (UWB) radar and alpha-stable clutter models  

Microsoft Academic Search

The use of an ultra-wideband (UWB) synthetic aperture radar (SAR) for detection of buried or obscured targets is an intense area of research because of the penetration and high-resolution capabilities of the radar. We address the important question of clutter modeling. More specifically, we examine the clutter observed from a forest for robust detection of targets that are buried in

R. Kapoor; G. A. Tsihrintzis; N. Nanclhakumar

1996-01-01

47

Antenna-source integrated ultra-wideband electromagnetic pulses radiating device  

Microsoft Academic Search

In 1901 Marconi tested the propagation property of electromagnetic fields using the folded monopole antenna, which was 150 ft in height, 200 ft in width, and excited at the tip of the monopole by the shorting of a spark gap. In the study of ultra-wideband electromagnetic pulse technology, we noted that with some improvements, the prototype method Marconi used has

Xiaoxin Song; Guozhi Liu; Yajun Fan; Xiaolong Liu; Feng Liu

1998-01-01

48

Pulse-Based, 100 Mbps UWB Transceiver  

Microsoft Academic Search

A pulse-based FCC-compliant ultra-wideband (UWB) transceiver is designed and integrated as a four chip and planar antenna\\u000a solution. The signaling is based on 500 MHz-wide subbanded binary-phase-shift-keyed (BPSK) Gaussian pulses centered in one\\u000a of 14 bands across the 3.1–10.6 GHz bandwidth. The system includes a UWB planar antenna, a Gaussian BPSK transmitter, a direct-conversion\\u000a front-end, dual 500 MSps analog-to-digital converters,

Fred S. Lee; Raúl Blázquez; Brian P. Ginsburg; Johnna D. Powell; David D. Wentzloff; Anantha P. Chandrakasan

49

An overview of Sandia National Laboratories' plasma switched, gigawatt, ultra-wideband impulse transmitter program  

Microsoft Academic Search

Sandia National Laboratories has developed several repetitive, ultra-wideband (UWB), impulse transmitters to address impulse source technology and to support experimental applications. The sources fall into two different classes, pulse peaking and pulse shorting depending on how the UWB frequency components are generated. The frequency spectrum of the radiated pulse from these sources include the spectrum of 100-MHz to 3-GHz. Depending

R. S. Clark; L. F. Rinehart; M. T. Buttram; J. F. Aurand

1992-01-01

50

Coherent power combining of ultra-wideband pulsed radiation in free space  

Microsoft Academic Search

Photoconductive switches are used to trigger an array of three pulsed ultra-wideband antennas. The jitter-free pulses radiated by each antenna add together in free space to produce a radiated field pattern that is steerable via true optical time-delay techniques. This technique can be applied to an N-element phased array for increased radiated power and beam-steering capabilities

Eric E. Funk; Stephen E. Saddow; C. H. Lee

1995-01-01

51

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

52

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

53

The detection and localization of targets in 2D or 3D scene using ultra-wideband short-pulse through-the-wall radar  

NASA Astrophysics Data System (ADS)

This paper presents the simulations of TWRI (through the wall radar imaging) in 2D and 3D scene and discusses the finite beamwidth processing to reduce the high calculation of the back-projection algorithm. The 2D and 3D scene are reconstructed to display the performance of the TWRI system using analysis, numerical simulations and real data collected from Through-the-Wall Radar (TWR). At the end of this paper, a novel approach is proposed to locate the position of the target accurately using the Ultra-Wideband Short-Pulse (UWB-SP) Radar.

Wu, Shiyou; Huang, Qiong; Meng, Shengwei; Chen, Jie; Fang, Guangyou; Yin, Hejun

2009-10-01

54

Ultra-Wideband Multifunctional Communications\\/Radar System  

Microsoft Academic Search

We have designed, simulated, fabricated, and tested an ultra-wideband (UWB) multifunctional communication and radar system utilizing a single shared transmitting antenna aperture. Two surface acoustic wave bandpass chirp filters were used to modulate the radar and communications pulses, generating linear frequency modulation waveforms with opposite slope factors. The system operates at a center frequency of 750 MHz with 500 MHz

George N. Saddik; Rahul S. Singh; Elliott R. Brown

2007-01-01

55

Ultra-fast Pulse Transmitter for UWB Microwave Radar  

Microsoft Academic Search

A design and measurement result on formation of ultra short pulses for the transmitter of ultra wideband (UWB) microwave radar is presented in this paper. Ultra-fast transmitter pulses were generated by avalanche pulse generator and successively sharpened using step recovery diode (SRD) based pulse sharpener circuit. The SRD diode was auto-biased from the input pulses of amplitude +7V. Present method

A. Ruengwaree; A. Ghose; J. Weide; G. Kompa

2006-01-01

56

Balun with passband characteristic for ultra-wideband (UWB) impulse radio transmitter  

Microsoft Academic Search

This paper presents on-chip balun with capacitors connected in series (BCCS) has three-order high pass frequency characteristic. It can be used to suppress the power spectral density (PSD) of UWB impulse radio (UWB-IR) signal within 0.96–1.61GHz. With proper value of capacitor, BCCS has sharper cutoff edge than the balun without capacitor connected, which is desired for UWB-IR transmitter. The balun

Ruibing Dong; Ramesh K. Pokharel; Haruichi Kanaya; Keiji Yoshida

2012-01-01

57

3D SAR image formation for underground targets using ultra-wideband (UWB) radar  

NASA Astrophysics Data System (ADS)

This paper analyzes the application of ultra-wideband ground-penetrating radar (GPR) in a down-looking configuration for the detection of buried targets. As compared to previous studies, where target detection algorithms have been developed based on the radar range profiles alone (pre-focus data), we investigate the potential performance improvement by forming synthetic aperture radar (SAR) images of the targets. This becomes important in scenarios with small signal-to-noise or signal-to-clutter ratios. Our three-dimensional (3-D) image formation algorithm is based on the backprojection technique. We apply this method to radar scattering data obtained through computer simulation by the finite-difference time-domain (FDTD) technique. Our analysis demonstrates the advantages of using focused SAR images versus the pre-focus range profiles. We also perform a parametric study of several physical factors that could affect the image quality.

Nguyen, Lam; Dogaru, Traian; Innocenti, Roberto

2009-05-01

58

Ultra-wideband Communications  

Microsoft Academic Search

Many applications in wireless communications often require short-range systems capable of rapidly collecting data and transmitting it reliably. Commercial communication systems operate in fixed frequency bands and are easily detectable and are prone to jamming by the enemy, among other shortcomings. The new ultra-wideband (UWB) communications system in the 3.1 to 10 GHz band is of significant interest to a

K Waltjen; C Romero; S Azevedo; F Dowla; A Spiridon; D Benzel; P Haugen

2004-01-01

59

Free space optical ultra-wideband communications over atmospheric turbulence channels  

Microsoft Academic Search

A hybrid impulse radio ultra-wideband (IR-UWB) communication system in which UWB pulses are transmitted over long distances through free space optical (FSO) links is proposed. FSO channels are characterized by random fluctuations mainly due to the atmospheric turbulence. For this reason, theoretical detection error probability analysis is presented for a time-hopping pulse-position modulated (TH-PPM) UWB signal model under weak, moderate

K. Davasliog?lu; E. C?ag?iral; M. Koca

2010-01-01

60

Evaluation of ultra-wideband (UWB) echo data using bispectral processing techniques  

NASA Astrophysics Data System (ADS)

Preliminary results are presented from evaluations of ultrawideband (UWB) radar echo signal data, using both bispectral processing and the affine approach of kernel analysis. It appears possible to describe the backscatter properties of radar-absorbing materials and clutter-type materials, raising the prospect of a characterization of material types on the basis of UWB echo signal processing. Because these techniques are effective under low S/N operating conditions, they may be of great practical significance.

Marmarelis, Vasilis Z.; Sheby, David; Kisenwether, Elizabeth C.; Erdley, Todd A.

1992-05-01

61

Repetitive, plasma switched, gigawatt, ultra-wideband impulse transmitter development  

Microsoft Academic Search

Sandia National Laboratories has developed several repetitive, ultra-wideband (UWB), impulse transmitters to address impulse source, and to support experimental applications. The sources fall into two different classes, pulse peaking and pulse shorting. SNIPER (Sub-Nanosecond ImPulsE Radiator) is a source which uses an oil peaking switch to obtain a fast risetime (250-pS) pulse of 2-nS duration. The output voltage ranges between

R. S. Clark; L. F. Rinehart; M. T. Buttram; J. F. Aurand; J. M. Lundstrom; P. E. Patterson; L. D. Roose; W. Crowe

1992-01-01

62

ULTRA-WIDEBAND (UWB) RADAR FOR REMOTE MEASURING OF MAIN PARAMETERS OF PATIENT'S VITAL ACTIVITY  

Microsoft Academic Search

The possibility of UWB radar use in medicine for remote measuring of patient's heart activity and respiration is considered. The measuring method is described and practical results of tests are cited. The probability of radar implementation in the other fields is shown.

Igor Y. Immoreev; Sergey V. Samkov; V. Samkov

63

100 GHz ultra-wideband (UWB) fiber-to-the-antenna (FTTA) system for in-building and in-home networks.  

PubMed

Fiber-to-the-antenna (FTTA) system can be a cost-effective technique for distributing high frequency signals from the head-end office to a number of remote antenna units via passive optical splitter and propagating through low-loss and low-cost optical fibers. Here, we experimentally demonstrate an optical ultra-wideband (UWB) - impulse radio (IR) FTTA system for in-building and in-home applications. The optical UWB-IR wireless link is operated in the W-band (75 GHz - 110 GHz) using our developed near-ballistic unitraveling-carrier photodiode based photonic transmitter (PT) and a 10 GHz mode-locked laser. 2.5 Gb/s UWB-IR FTTA systems with 1,024 high split-ratio and transmission over 300 m optical fiber are demonstrated using direct PT modulation. PMID:20173867

Chow, C W; Kuo, F M; Shi, J W; Yeh, C H; Wu, Y F; Wang, C H; Li, Y T; Pan, C L

2010-01-18

64

Optimum Pulse Shape Design for UWB Systems with Timing Jitter  

NASA Astrophysics Data System (ADS)

This paper proposes a novel technique in designing the optimum pulse shape for ultra wideband (UWB) systems under the presence of timing jitter. In the UWB systems, pulse transmission power and timing jitter tolerance are crucial keys to communications success. While there is a strong desire to maximize both of them, one must be traded off against the other. In the literature, much effort has been devoted to separately optimize each of them without considering the drawback to the other. In this paper, both factors are jointly considered. The proposed pulse attains the adequate power to survive the noise floor and at the same time provides good resistance to the timing jitter. The proposed pulse also meets the power spectral mask restriction as prescribed by the Federal Communications Commission (FCC) for indoor UWB systems. Simulation results confirm the advantages of the proposed pulse over other previously known UWB pulses. Parameters of the proposed optimization algorithm are also investigated in this paper.

Lee, Wilaiporn; Kunaruttanapruk, Suwich; Jitapunkul, Somchai

65

Ultra-wideband generators.  

National Technical Information Service (NTIS)

High-power ultra-wideband pulses with equivalent center frequences of 10 GHz require picosecond switching times of high electric fields. We are developing a high-pressure gas switch that is designed to store several joules of energy. The switch has an ove...

P. A. Pincosy P. Poulsen J. J. Morrison

1991-01-01

66

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

67

An overview of ultra-wideband technique  

Microsoft Academic Search

In recent years, ultra-wideband (UWB) technique was considered as a candidate for short range high data rate communications with precise location and positioning ability at the order of centimeter, and many contributions have been presented by researchers, which promoted the development of UWB technique. In this paper, the state of the art and new development of UWB technique was presented

Sha Xue-jun; Wu Xuan-li; Zhang Qin-yu; Wang Yang

2010-01-01

68

Neuromorphic interconnects using Ultra Wideband radio  

Microsoft Academic Search

We present the architecture and testing of an address event representation (AER) wireless link that uses ultra wideband (UWB) radio as the physical layer. The wireless protocol layers from high to low level are: AER events, asynchronous handshaking, PRN coding, and UWB transmission. The top three layers are implemented in digital logic in an FPGA, while the UWB physical layer

Andrew Cassidy; Zhaonian Zhang; Andreas G. Andreou

2008-01-01

69

Compressed Sensing Based Ultra-Wideband Communication System.  

National Technical Information Service (NTIS)

Sampling is the bottleneck for ultra-wideband (UWB) communication. Our major contribution is to exploit the channel itself as part of compressed sensing, through waveformbased pre-coding at the transmitter. We also have demonstrated a UWB system baseband ...

B. M. Sadler P. Zhang R. C. Qiu Z. Hu

2009-01-01

70

Ultra-wideband generators  

Microsoft Academic Search

High-power ultra-wideband pulses with equivalent center frequences of 10 GHz require picosecond switching times of high electric fields. We are developing a high-pressure gas switch that is designed to store several joules of energy. The switch has an overvoltaged gap that is pulse charged to operating voltages before the electron avalanche causes the voltage to collapse. Depending on the gas

P. A. Pincosy; P. Poulsen; J. J. Morrison

1991-01-01

71

Orthogonally-spread block transmissions for ultra-wideband impulse radios  

Microsoft Academic Search

Differential, transmitted reference (TR) and energy detection (ED) based ultra-wideband impulse radios (UWB- IR) can collect the rich multipath energy offered by UWB channels with a low-complexity receiver. However, they perform satisfactorily only when the channel induced inter-pulse inter- ference (IPI) is negligible. This can be achieved by appending a guard interval with duration greater than or equal to the

Shahrokh Farahmand; Xiliang Luo; Georgios B. Giannakis

2008-01-01

72

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

73

Noncoherent ultra-wideband systems  

Microsoft Academic Search

The need for low-complexity devices with low-power consumption motivates the application of suboptimal noncoherent ultra-wideband (UWB) receivers. This article provides an overview of the state of the art of recent research activities in this field. It introduces energy detection and autocorrelation receiver front ends with a focus on architectures that perform the initial signal processing tasks in the analog domain,

Klaus Witrisal; Geert Leus; Gerard Janssen; Marco Pausini; Florian Troesch; Thomas Zasowski; Jac Romme

2009-01-01

74

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

SciTech Connect

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

75

Superregenerative Incoherent UWB Pulse Radar System  

Microsoft Academic Search

A new short range ultra wideband (UWB) radar system with a very simple design due to its superregenerative receiver concept has been studied. The system does not require any amplification of RF or IF signals which allows to build a very inexpensive low-power sensor. With measurements, simple mathematical models and a simulation in time-domain the voltage amplitude of the measurement

T. Wuchenauer; M. Nalezinski; W. Menzel

2006-01-01

76

Detection of Avalanche Victims Using Ultra-wideband Short-Pulse Radar  

NASA Astrophysics Data System (ADS)

A short-pulse UWB radar system for search and rescue (SAR) operations of snow avalanche victims has been studied through numerical simulation and measurements. The FDTD method was used to model the radar system, the snow, and a realistic human phantom model buried in snow. A 0.5-ns UWB pulse with f0 = 2 GHz is used to illuminate the buried phantom from an array of nine transmitters. The reflected signals were received on a planer array and were processed using the time projection technique to generate ISAR images in the x-z and x-y planes. Farr impulse antennas were also used to measure reflected signals off buried targets, including a human phantom in snow. In both simulation and measurements, the removal of the background reflections (data with no buried targets) was a requirement to improve the dynamic range and toisolate the reflected signals due to buried targets.

Chamma, Walid A.; Mende, Howard; Barrie, Greg; Robinson, Robert

77

The design of integrated 3GHz to 11GHz CMOS transmitter for full-band ultra-wideband (UWB) applications  

Microsoft Academic Search

The CMOS integrated 3-GHz to 11-GHz transmitter for full-band UWB applications is proposed and designed in 0.13-mum CMOS technology. The designed UWB transmitter is integrated with a 2:1 frequency divider, a quadrature up-conversion mixer, a balanced RF amplifier, and a 3-stage cascaded poly-phase filter. The technique of inductance peaking has been adopted to achieve 14 -band operation for UWB applications.

Wen-chieh Wang; Chang-ping Liao; Yi-kai Lo; Zue-der Huang; Fadi Riad Shahroury; Chung-yu Wu

2008-01-01

78

High-Speed Photonic Power-Efficient Ultra-Wideband Transceiver Based on Multiple PM-IM Conversions  

Microsoft Academic Search

We experimentally demonstrate a novel photonic ultra-wideband (UWB) transceiver with pulse spectral efficiency of 50.97% and transmission speed up to 3.125 Gb\\/s. The UWB generator only consists of a highly nonlinear fiber (HNLF) and a commercial arrayed-waveguide grating (AWG). By using the concept of multiple cross-phase modulation in the HNLF and multiple phase modulation to intensity modulation conversions in the

Enbo Zhou; Xing Xu; King-Shan Lui; Kenneth Kin-Yip Wong

2010-01-01

79

Multiuser Channel Estimation for Ultra-Wideband Systems Using up to the Second-Order Statistics  

Microsoft Academic Search

In a pulse-position modulation-based ultra-wideband (UWB) communication system, multiple access is enabled by assigning unique time-hopping sequences to di erent users. Each user's data information is carried by positions of short pulses which are directly transmitted through an unknown and possibly dense multipath channel. Single-user channel estimation methods have been proposed by maximum likelihood optimization that treats multiple access interference

Zhengyuan Xu; Jin Tang; Ping Liu

2005-01-01

80

Ultra-wideband signal propagation experiments in liquid media  

NASA Astrophysics Data System (ADS)

Ultra-wideband (UWB) signals exhibit different characteristics upon propagation through matter compared with narrowband signals. The latter keeping a sinusoidal shape during different forms of signal propagation. The behavior of narrowband signals does not apply to UWB signals in many cases. Presently, the possibilities for development of UWB signaling technology remain largely unexplored. Only a few applications have been developed due to strict regulations by the Federal Communications Commission (FCC). In this paper we describe a series of experiments that have been carried out to determine the behavior of UWB signals and their properties. A TEM horn antenna has been made for radiating UWB signals. Experiments on pulse propagation have been carried out including an application to detection of stationary metal objects. A high accuracy in detecting metal objects has been achieved. A procedure for propagating UWB signals through a liquid medium of given salt concentration has been demonstrated, providing a basis for studying UWB signal propagation in biological matter. A new pulsewidth definition was adopted which is suitable for UWB signal propagation.

Challa, Shravan; Mitra, Atindra; Selmic, Rastko; Simicevic, Neven

2008-05-01

81

Ultra-wideband range estimation: Theoretical limits and practical algorithms  

Microsoft Academic Search

The high time resolution of ultra-wideband (UWB) signals enables wireless devices to perform accurate range estimation. In order to realize UWB systems with accurate ranging capabilities, both theoretical limits on range estimation and practical algorithms that approach those limits should be investigated. This paper provides a survey of various UWB ranging algorithms and discusses their performance and complexity tradeoffs. In

Ismail Guvenc; Sinan Gezici; Zafer Sahinoglu

2008-01-01

82

Timing acquisition in ultra-wideband communication systems  

Microsoft Academic Search

The goal of this paper is to highlight the significance of the timing acquisition problem in ultra-wideband (UWB) communication systems and discuss efficient solutions to the problem. We discuss how the distinguishing features of UWB communication systems, such as their wide bandwidth and low transmission power constraints, are responsible for making the acquisition of UWB signals a difficult task. A

Sandeep R. Aedudodla; Saravanan Vijayakumaran; Tan F. Wong

2005-01-01

83

Ultra wideband interference effects on an amateur radio receiver  

Microsoft Academic Search

This paper illustrates the complexity of issues that arise in the accurate measurement and interpretation of ultra wideband (UWB) interference effects in narrowband receivers. The behavior of an amateur radio receiver in the presence of sinusoidal and UWB interference is studied. We characterize antenna response and receiver nonlinearities, which lead to an understanding of UWB effects on the receiver output

R. D. Wilson; R. D. Weaver; M.-H. Chung; R. A. Scholtz

2002-01-01

84

Performance of ultra-wideband communications with suboptimal receivers in multipath channels  

Microsoft Academic Search

The performance of a single-user ultra-wideband (UWB) communication system employing binary block-coded pulse-position modulation (PPM) and suboptimal receivers in multipath channels is considered. The receivers examined include a RAKE receiver with various diversity combining schemes and an autocorrelation receiver, which is used in conjunction with transmitted reference (TR) signaling. A general framework is provided for deriving the performance of these

John D. Choi; Wayne E. Stark

2002-01-01

85

The Interval Modulation System For The Ultra-Wideband Vehicular Radar  

Microsoft Academic Search

Since the (FCC) Federal Communications Commission approved the (UWB) Ultra-wideband application into the civilian areas, research on the UWB vehicular radar aroused much interest. Using of vehicular sensing radar is an important method in preventing the occurrence of traffic accidents, and enhance the radar's performance can directly improve the effectiveness of the collision prevention system. Ultra-wideband is a relatively new

Xi Li; Zhiguo Wang; Yuanchun Fei; Dechun Guo

2006-01-01

86

Study of a method for 2-D imaging of simple-shaped targets with arbitrary motion using UWB radar with a small number of antennas  

Microsoft Academic Search

Ultra-wideband (UWB) pulse radar is an effective device as the basis for building a high-precision surveillance system. The fast SEABED (Shape Estimation Algorithm based on BST and Extraction of Directly scattered waves) imaging algorithm is capable of accurately estimating target shapes using UWB pulse radar. A new UWB radar imaging algorithm, based on an extension of the SEABED algorithm that

Yuji Matsuki; Takuya Sakamoto; Toru Sato

2010-01-01

87

Silicon-Based Ultra-Wideband BeamForming  

Microsoft Academic Search

Ultra-wideband (UWB) beam-forming, a special class of multiple-antenna systems, allows for high azimuth and depth resolutions in ranging and imaging applications. This paper reports a fully integrated UWB beam-former featuring controllable true time delay and power gain. Several system and circuit level parameters and characterization methods influencing the design and testing of UWB beam-formers are discussed. A UWB beam-former prototype

Jonathan Roderick; Harish Krishnaswamy; Kenneth Newton; Hossein Hashemi

2006-01-01

88

Optimal pilot waveform assisted modulation for ultra-wideband communications  

Microsoft Academic Search

Performance of ultra-wideband (UWB) communication systems can be enhanced by collecting multipath diversity gains, once the channels are acquired at the receiver. In this paper, we develop a novel pilot waveform assisted modulation (PWAM) scheme that is tailored for power-limited UWB communications, and can be implemented in analog form. The PWAM parameters are designed to jointly optimize performance and information

Liuqunig Yang; Georgios B. Giannakis

2002-01-01

89

Ultra-wideband generators  

NASA Astrophysics Data System (ADS)

High-power ultra-wideband pulses with equivalent center frequences of 10 GHz require picosecond switching times of high electric fields. We are developing a high-pressure gas switch that is designed to store several joules of energy. The switch has an overvoltaged gap that is pulse charged to operating voltages before the electron avalanche causes the voltage to collapse. Depending on the gas pressure (designed for up to 100 atm) and the electric field, the voltage collapse time can be hundreds of picoseconds down to a few picoseconds. Uniform development of the avalanche is initiated by photoionization from a bare spark or an ultraviolet laser. The pulse-power charging system is designed to charge the transmission line in a few nanoseconds. The stored energy that would flow as a post-pulse component is to be minimized. Tests of the repetition rate for the switch are part of the development. Data in this paper indicate the achieved gap electric field, the voltage collapse time, and the launched pulse power and energy down transmission line.

Pincosy, P. A.; Poulsen, P.; Morrison, J. J.

1991-12-01

90

Photonic generation of power-efficient ultra-wideband waveforms using a single semiconductor optical amplifier  

NASA Astrophysics Data System (ADS)

A novel photonic generation of power-efficient ultra-wideband (UWB) pulse by combining two asymmetric monocycle pulses with inverted polarities is experimentally demonstrated. The principle lies in cross-phase modulation (XPM) in a single semiconductor optical amplifier (SOA) and phase modulation to intensity modulation conversions in an arrayed-waveguide grating (AWG). The Federal Communications Committee (FCC) compliant UWB pulse gains 24.3 dB and 20.8 dB improvements compared to positive and negative monocycle pulses after power attenuation to respect the FCC spectral mask, respectively. The generated power-efficient UWB with pulse duration of about 310 ps has potential to achieve high speed transmission and modulation without overlapping and distortion.

Dong, Jianji; Zhang, Yin; Yu, Yuan; Huang, Dexiu; Zhang, Xinliang

2010-12-01

91

Development of a Tunable Multiband UWB Radar Sensor and Its Applications to Subsurface Sensing  

Microsoft Academic Search

Development of a new tunable multiband ultra-wideband (UWB) radar sensor is presented. The UWB sensor integrates the transmitter, receiver, and antennas completely in a single package using microwave integrated circuits and operates over multiple pulse durations or frequency bands. The sensor can transmit pulses with duration varying from 450 to 1170 ps and peak power from 200 to 400 mW

Jeongwoo Han; Cam Nguyen

2007-01-01

92

Power-efficient switching-based CMOS UWB transmitters for UWB communications and Radar systems  

Microsoft Academic Search

This paper presents a new carrier-based ultra-wideband (UWB) transmitter architecture. The new UWB transmitter implements a double-stage switching to enhance RF-power efficiency, reduce dc-power consumption, and increase switching speed and isolation, while reducing circuit complexity. In addition, this paper also demonstrates a new carrier-based UWB transmitting module implemented using a 0.18-mum CMOS integrated pulse generator-switch chip. The design of a

Rui Xu; Yalin Jin; Cam Nguyen

2006-01-01

93

The capacity of an UWB multiple-access communications system  

Microsoft Academic Search

In this paper we compute the channel capacity of M-ary pulse position modulation ultra-wideband (UWB) communications over multiple-access channels. Under certain assumptions, the multiple-access noise component at the receiver can be modeled as Gaussian. An expression for the signal-to-noise ratio is developed for UWB utilizing rectangular pulses. The information theoretic capacity of the UWB system is expressed as a function

Li Zhao; Alexander M. Haimovich

2002-01-01

94

A CMOS 22-29GHz Receiver Front-End for UWB Automotive Pulse-Radars  

Microsoft Academic Search

The design of a CMOS 22-29 GHz pulse-radar receiver (RX) front-end for ultra-wideband (UWB) automotive radar sensors is presented. Fabricated in a 0.18 mum CMOS process, the 3 mm2 RX chip achieves a conversion gain of 35-38.1 dB, noise figure of 5.5-7.4 dB and input return loss less than -14.5 dB in the 22-29 GHz band. The phase noise of

V. Jain; S. Sundararaman; P. Heydari

2007-01-01

95

Measurement and characterization of ultra-wideband wireless interconnects within active computing systems  

Microsoft Academic Search

This paper presents experimental measurements of ultra-wideband (UWB) wireless interconnects within an operational computer system chassis. Using an impulse-radio ultra-wideband (IR-UWB) 3-5GHz transceiver, this paper analyzes and verifies the implementation of high-bandwidth wireless communications within an enclosed, heavy multipath, metallic environment such as a computer server chassis. Bit-error-rate (BER) and recovered clock jitter were measured at various positions within the

Sirikarn Woracheewan; Changhui Hu; Rahul Khanna; Jay Nejedlo; Huaping Liu; Patrick Chiang

2011-01-01

96

Experimental and theoretical investigation of the multiband OFDM ultra-wideband radio over multimode fiber transmission  

Microsoft Academic Search

A combined wireless and optical channel for multiband orthogonal frequency division multiplexing (MB OFDM) ultra-wideband (UWB) radio transmission has been investigated both experimentally and theoretically. The channel consists of a directly modulated vertical cavity surface emitting laser (VCSEL), wireless channel, ultra-wideband (UWB) antenna, multimode optical fiber (MMF) and a p-i-n diode as a photodetector (PD). It has been shown both

Y. Ben Ezra; B. I. Lembrikov; M. Ran; A. Leibovich; E. Borohovich

2008-01-01

97

UWB Impulse Radar Characterization and Processing Techniques.  

National Technical Information Service (NTIS)

Ultra-Wideband (UWB) impulse radar is inherently a noise-limited technology. While sub-nanosecond pulses achieve good range resolution, the resultant extreme bandwidth exacts a toll on system performance in terms of noise power entering the receiver. Data...

G. Barrie

2004-01-01

98

Evaluation of an Ultra-Wideband Propagation Channel  

Microsoft Academic Search

This paper describes the results of an ultra- wideband (UWB) propagation study in which arrays of propagation measurements were made. After a description of the propagation measurement technique, an approach to the spatial and temporal decomposition of an array of mea- surements into wavefronts impinging on the receiving array is presented. Based on am odification of the CLEAN algo- rithm,

J. M. Cramer; R. A. Scholtz; M. Z. Win

2002-01-01

99

Ultra-wideband communication using hybrid matched filter correlation receivers  

Microsoft Academic Search

For ultra-wideband (UWB) communication, Rake receivers using matched filter detection show the best performance but they are complex to realize due to the inherent channel estimation problem and combining problem. Transmitted reference schemes, on the other hand, allow for a less complex receiver structure that is able to combine the energy from different multipath components without channel estimation. These schemes,

Fredrik Tufvesson; Andreas F. Molisch

2004-01-01

100

Minimizing average network delay for ultra-wideband wireless networks  

Microsoft Academic Search

Ultra-wideband wireless (UWB) may provide the physical layer for high capacity personal area networks in the future. Certain characteristics of the wireless links possible using this technology give rise to properties not seen with other wireless technologies. Two such properties are long synchronization times for link establishment and the ability to change individual link capacities by choosing PN codes of

Christopher S. Taggart; Yannis Viniotis; Mihail L. Sichitiu

2005-01-01

101

Small Antennas for Mobile and Ultra-Wideband Communication  

Microsoft Academic Search

Mobile communication is an enormous growing market of communication and has a strong influence on the RF and microwave world. While UMTS is on the way of installation and going into business, new communication system technologies can be seen at the horizon of the communication world. One of this is UWB, the ultra wideband communication. This promising technology can become

D. Heberling; D. Manteuffel; M. Martínez-Vázquez; M. Geissler; O. Litschke

102

Augmented Reality Using Ultra-Wideband Radar Imagery.  

National Technical Information Service (NTIS)

The U.S. Army Research Laboratory (ARL) has been investigating the utility of ultra-wideband (UWB) synthetic aperture radar (SAR) technology for detecting concealed targets in various applications. We have designed and built a vehicle-based, low-frequency...

F. Koenig K. Sherbondy L. Nguyen

2010-01-01

103

Ultra-Wideband Tracking System Design for Relative Navigation.  

National Technical Information Service (NTIS)

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 loca...

D. Arndt J. Dusl J. D. Ni K. Dekome P. Bgo

2011-01-01

104

Safety assessment of ultra-wideband antennas for microwave breast imaging.  

PubMed

This article deals with the safety assessment of several ultra-wideband (UWB) antenna designs for use in prototype microwave breast imaging systems. First, the performances of the antennas are validated by comparison of measured and simulated data collected for a simple test case. An efficient approach to estimating the specific energy absorption (SA) is introduced and validated. Next, SA produced by the UWB antennas inside more realistic breast models is computed. In particular, the power levels and pulse repetition periods adopted for the SA evaluation follow the measurement protocol employed by a tissue sensing adaptive radar (TSAR) prototype system. Results indicate that the SA for the antennas examined is below limits prescribed in standards for exposure of the general population; however, the difficulties inherent in applying such standards to UWB exposures are discussed. The results also suggest that effective tools for the rapid evaluation of new sensors have been developed. PMID:21826686

De Santis, Valerio; Sill, Jeff M; Bourqui, Jeremie; Fear, Elise C

2011-08-08

105

An Ultra-Wideband Bidirectional Antenna with Modified Circular Disc Monopole Excited Elliptical Ring  

Microsoft Academic Search

The antenna design for ultra-wideband (UWB) signal radiation is one of the main challenges of the UWB system, especially when the antenna can satisfy the requirement of low-cost, compactness, linear polarization and bidirectional pattern. This paper proposes a UWB bidirectional antenna with introducing the psi shape feeder to circular disc monopole (CDM) excited elliptical ring for modern base station in

Krittaya Chawanonphithakl; Chuwong Phongcharoenpanich; Sompol Kosulvit; Monai Krairiksh

2007-01-01

106

Feasibility of ultra-wideband SAW RFID tags meeting FCC rules  

Microsoft Academic Search

We discuss the feasibility of surface acoustic wave (SAW) radio-frequency identification (RFID) tags that rely on ultra-wideband (UWB) technology. We propose a design of a UWB SAW tag, carry out numerical experiments on the device performance, and study signal processing in the system. We also present experimental results for the proposed device and estimate the potentially achievable reading distance. UWB

S. Harma; V. P. Plessky; Xianyi Li; P. Hartogh

2009-01-01

107

On the coexistence of ultra-wideband and narrowband radio systems  

Microsoft Academic Search

Ultra-wideband (UWB) signals will encounter many interference sources, primarily from relatively narrowband (NB) systems. In addition., UWB signals will also affect a large number of NB radios; of critical importance is the potential interference with GPS, E-911, and navigation bands, as well as cellular bands. There is a rich and growing literature on UWB radios; however, issues related to interference

Ananthram Swami; Brian Sadler; Joi Turner

2001-01-01

108

All-optical ultra-wideband doublet signal source based on the cross-gain modulation in a semiconductor optical amplifier  

NASA Astrophysics Data System (ADS)

We propose a novel scheme to generate the ultra-wideband (UWB) doublet signal pulse based on the cross-gain modulation (XGM) in a semiconductor optical amplifier (SOA). In the scheme, only an optical source and an SOA are needed. As there is only one wavelength included in the output doublet signal pulse, no time difference between the upper and down pulses is introduced during the transmission process. By using the software of Optisystem 7.0, the impacts of the optical power, the SOA current, the wavelength and the input signal pulse width on the generated doublet pulse are simulated and tudied numerically. The results show that when the pulse width of the input signal pulse is larger, the output signal pulse is better, and is insensitive to the change of wavelength. In addition, the ultra-wideband positive and negative monocycles can be generated by choosing suitable optical source power and SOA current.

Zhao, Zan-shan; Li, Pei-li; Zheng, Jia-jin; Pan, Ting-ting; Huang, Shi-jie; Luo, You-hong

2012-03-01

109

A novel synchronization algorithm in ultra-wideband system  

Microsoft Academic Search

Synchronization remains one of the biggest challenges in the ultra-wideband (UWB) impulse radio system. In this paper, a frame-level synchronization algorithm is proposed in differential transmitted reference (DTR) UWB systems in the multipath environment. The signal structure is judiciously designed with the aided data and m-sequence code. Enjoying the fine property of m-sequence autocorrelation function, the proposed algorithm can suppress

Biao Liu; Tiejun Lv; Yongwei Qiao; Weidong Liu; Long Gao

2009-01-01

110

Spatial group delay patterns for three ultra wideband spline antennas  

Microsoft Academic Search

The IEEE ultra wideband (UWB) standard includes both a multiple frequency carrier (MB-OFDM) and an impulse spectrum (DS-UWB) method, for which application antennas should be appropriately optimized. Small printed monopoles with outline features that can be defined by a Bezier-spline [1] have good matched impedance performance across the 3.1 - 10.6 GHz band. For communications applications, an omni-directional pattern, where

Patrick McEvoy; Matthias John; Sergio Curto; Max J Ammann

2008-01-01

111

A multibanded system architecture for ultra-wideband communications  

Microsoft Academic Search

The FCC ruling in 2002 allowing for the unlicensed deployment of ultra-wideband (UWB) devices for communications purposes in the 3.1-10.6 GHz band has sparked great interest in the industry. In particular, the IEEE 802.15.3a task group is currently developing a standard for high-rate, short-range wireless communication systems that is expected to use UWB technology. One of the main challenges for

Jefiey R. Foerster; V. Somayazulu; Sumit Roy

2003-01-01

112

Packet Scheduling with Fairness Adaptation in Ultra Wideband Wireless Networks  

Microsoft Academic Search

Ultra-wideband (UWB) transmission is an emerging wireless technology, and medium access control (MAC) with quality of service (QoS) provisioning is essential to coordinate the access among competing devices in UWB-based wireless networks. In this paper, we study the exclusive region concept (which was previously proposed) to determine the active set of senders at a time. We find out that, different

Hai Jiang; Weihua Zhuang

113

Planar elliptical element ultra-wideband dipole antennas  

Microsoft Academic Search

Abstract: This note introduces a new class of ,planar ultra-wideband (UWB) dipoles that use elliptical elements. These ,antennas offer good ,dipole performance ,over nearly two octaves in frequency. Unlike ,more traditional broadband dipole elements that must be around a quarter-wavelength to radiate efficiently, planar elliptical UWB dipoles still exhibit a –10 dB return loss for a 0.20? element size, and

H. G. Schantz

2002-01-01

114

Daredevil: ultra-wideband radar sensing for small UGVs  

Microsoft Academic Search

We are developing an ultra wideband (UWB) radar sensor payload for the man-portable iRobot PackBot UGV. Our goal is to develop a sensor array that will allow the PackBot to navigate autonomously through foliage (such as tall grass) while avoiding obstacles and building a map of the terrain. We plan to use UWB radars in conjunction with other sensors such

Brian Yamauchi

2007-01-01

115

Characterization of wall dispersive and attenuative effects on UWB radar signals  

Microsoft Academic Search

This paper addresses the potentials of ultra-wideband (UWB) through-wall imaging radars compared with conventional narrowband systems. The challenges that limit the utilization of high precision UWB systems are examined with the aim of mitigating them. These challenges include multi-path, pulse dispersion, and antenna effects on the pulse shape due to angles of transmission and arrival. The propagation of UWB signals

Ali Muqaibel; Ahmad Safaai-Jazi

2008-01-01

116

Ultra-wideband radar  

Microsoft Academic Search

Here, we present a description of a block scheme, characteristics, specific features of design and results of testing for a prototype of the ultrawideband (UWB) radar, which has been developed by Russian UWB group researchers at Moscow Aviation Institute at \\

I. Immoreev; E. Ziganshin

2004-01-01

117

On the UWB system coexistence with GSM900, UMTS\\/WCDMA, and GPS  

Microsoft Academic Search

This paper evaluates the level of interference caused by different ultra-wideband (UWB) signals to other various radio systems, as well as the performance degradation of UWB systems in the presence of narrowband interference and pulsed jamming. The in-band interference caused by a selection of UWB signals is calculated at GSM900, UMTS\\/wideband code-division multiple-access (WCDMA), and Global Position System (GPS) frequency

Matti Hämäläinen; Veikko Hovinen; Raffaello Tesi; Jari H. J. Iinatti; Matti Latva-aho

2002-01-01

118

Pulse-Doppler UWB Radar  

Microsoft Academic Search

The paper contains measurement results of moving targets by pulse-Doppler UWB radar. The description of a radar, principle of operation and technical specification are presented. Conditions and results of measurements are described. Feature of the presented measurements: Doppler signals of linear moving targets whose linear sizes exceed resolution of radar

A. Chernenko; E. Ziganshin

2006-01-01

119

Ultra-wideband two-cluster tracking system design with angle of arrival algorithm  

Microsoft Academic Search

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

J. Ni; D. Arndt; P. Ngo; C. Phan; J. Gross

2006-01-01

120

Design of CMOS based ultra wideband low noise amplifier using active shunt feedback technique  

Microsoft Academic Search

This paper presents design technique of CMOS based UWB low noise amplifier using active shunt feedback technique at 0.18µm technology. The proposed low noise amplifier is able to provide high gain with flatness at ultra wideband (UWB) range, which yet consumes small power with simple and compact design model. This LNA is implemented using Cascode amplifier topology with active shunt

Ashish Bharade; Hemant Ghyvat; D. S. Ajnar; Pramod Jain

2011-01-01

121

Performance of an ultra wideband radar for detection of water accumulation in the human bladder  

Microsoft Academic Search

This paper presents an Impulse Radio Ultra Wideband (IR-UWB) radar for detecting water accumulation in the human bladder. The goal is to monitor the level of urine in patients who suffer from urinary incontinence. This is achieved by detecting the reflected UWB signals from the boundaries of human tissues such as muscle and urine. The reflection properties are investigated both

Xuyang Li; Elena Pancera; Lukasz Niestoruk; Wilhelm Stork; Thomas Zwick

2010-01-01

122

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

123

Low-frequency ultra-wideband synthetic aperture radar 1995 BoomSAR tests  

Microsoft Academic Search

The Army Research Laboratory has been investigating the potential of ultra-wideband synthetic aperture radar (UWB SAR) technology to detect and classify targets embedded in foliage or in the ground. The UWB foliage penetration (FOPEN) radar program has been extended to include the evaluation of ground penetration (GPEN) radar technology. ARL is investigating these problems by collecting high quality, precision data

Lynn Happ; Karl A. Kappra; Marc A. Ressler; Jeffrey P. Sichina; Keith Sturgess; Francis Le

1996-01-01

124

A Novel Framework for Medium Access Control in Ultra-Wideband Ad Hoc Networks  

Microsoft Academic Search

Ultra-wideband (UWB) communication is becoming an important technology for future Wireless Personal Area Networks (WPANs). A critical challenge in UWB system design is that a receiver usually needs tens of micro-seconds or even tens of milliseconds to synchronize with transmitted signals, known as timing acquisition problem. Such a long synchronization time will cause significant overhead, since the data rate of

Kejie Lu; Dapeng Wu; Yuguang Fang

2005-01-01

125

On the performance of UWB and DS-spread spectrum communication systems  

Microsoft Academic Search

We consider a binary spread spectrum system, with possibly episodic transmission; i.e., the system transmits n pulses per information bit, and allows for off time separation between pulses. Processing gain enables low power transmission, and the ultra wideband (UWB) spreading limits the interference effects into narrowband systems. We consider the issues of processing gain, jamming margin, coding gain and multiuser

B. M. Sadler; Anunthrum Swami

2002-01-01

126

A PPM Gaussian Monocycle Transmitter for Ultra-Wideband Communications  

Microsoft Academic Search

A Gaussian pulse generator incorporating a pulse position modulator for use in an impulse radio ultra- wideband system is described. The pulse generator is preceded by a programmable pulse-position modulator and comprises of a cascade of complex first-order systems, which, in turn, are made up of differential pairs employing partial positive feedback. The resulting PPM Gaussian pulse generator is designed

Sumit Bagga; Wouter A. Serdijn; John R. Long

127

On the performance of episodic UWB and direct-sequence communication systems  

Microsoft Academic Search

We consider a binary pulsed communication system, with possibly episodic transmission, i.e., the system transmits n pulses per information bit and allows for off-time separation between pulses. In the ultra-wideband (UWB) regime, such systems are motivated for overlay applications, as well as low probability of intercept and low probability of detection scenarios. Processing gain enables low-power transmission, and the UWB

Brian M. Sadler; Ananthram Swami

2004-01-01

128

Low frequencies and peak amplitude in UWB pulse propagation  

Microsoft Academic Search

Previous studies of ultra-wideband electromagnetic pulses that propagate through causal, dispersive and attenuative dielectric material have shown the existence of a Brillouin precursor, a component of the propagated field that decays algebraically with propagation distance rather than exponentially. Because each nonzero frequency component of the pulse decays exponentially with distance, in accordance with the Beer-Lambert law, the Brillouin precursor is

Natalie A. Cartwright

2010-01-01

129

An Ultra-Wideband CMOS Receiver Front-End  

Microsoft Academic Search

A CMOS receiver front-end for ultra-wideband (UWB) wireless communications based on multi-band OFDM -Alliance (MBOA) \\/ WiMedia standard proposal is presented. Employing a direct conversion architecture, the RF front-end chip integrates a single-ended wideband low-noise amplifier (LNA) and two double-balanced downconversion mixers. To reduce power consumption, the conversion of single ended LNA output to differential is embedded in the RF

Bo Shi; Michael Yan; Wah Chia

2007-01-01

130

An ultra-wideband CMOS receiver front-end  

Microsoft Academic Search

A CMOS receiver front-end for ultra-wideband (UWB) wireless communications based on multi-band OFDM alliance (MBOA)\\/WiMedia standard proposal is presented. Employing a direct conversion architecture, the RF front-end chip integrates a single-ended wideband low-noise amplifier (LNA) and two double-balanced downconversion mixers. To reduce power consumption, the conversion of single ended LNA output to differential is embedded in the RF transconductance circuit

Bo Shi; M. Y. W. Chia

2007-01-01

131

A novel auto-reference ultra-wideband receiver scheme  

Microsoft Academic Search

A new auto-reference (AR) transmit-receive scheme and a corresponding group decision algorithm on the generalized likelihood\\u000a ratio testing (GLRT) principle is proposed in this paper to overcome the drawbacks of the power inefficiency and the high\\u000a noise vulnerability in transmitted-reference (TR) ultra-wideband (UWB) systems. A partly overlapped detection window structure\\u000a is introduced in which the decided data frames are regarded

Xuewen Liao; Shihua Zhu; Erlin Zeng

2007-01-01

132

Generation of an ultra-wideband triplet signal based on semiconductor optical amplifier  

NASA Astrophysics Data System (ADS)

We propose a novel ultra-wideband (UWB) triplet signal source based on the cross-gain modulation (XGM) in semiconductor optical amplifier (SOA). In the proposed scheme, only an optical source and two SOAs are needed, so the all-optical structure is compact. A triplet optical pulse with center frequency of 6.25 GHz and fractional bandwidth of 83% is obtained by the scheme. The extinction ratio can be improved by the counter-propagating scheme. The triplet pulse signal with only one wavelength can be easily controlled, and can aviod the dispersion effect. The output triplet pulse signal is insensitive to the light wavelength shifts, its available wavelength range is wide, the dynamic range of the input power is more than 6 dBm, and the bias current of the SOAs is exhibited.

Ma, Qiang; Li, Pei-li; Zheng, Jia-jin; Shen, Dan-hong; Zhao, Meng; Zhou, Wen; Zhao, Zan-shan

2013-05-01

133

Generalized CRLB for DA and NDA Synchronization of UWB Signals with Clock Offset  

Microsoft Academic Search

In this paper the Cramer-Rao lower bound (CRLB) of an ultra-wideband (UWB) pulse amplitude modulated (PAM) signal with time hopping (TH) code is derived for the practical case where there is an initial unknown relative clock offset between the transmitter and receiver. However, it is assumed that there is a priori information about the probability density function of clock offset.

Saeed Khalesehosseini; John Nielsen

2007-01-01

134

A parametric study of time-domain characteristics of possible UWB antenna architectures  

Microsoft Academic Search

This paper is a step toward defining the characteristics of a suitable antenna to exploit the inherent advantages in pulsed communication systems, specifically that of ultra-wideband. In this respect, several traditional broadband antenna architectures are evaluated with an emphasis given towards a time-domain perspective. In addition, a good UWB antenna should be reasonably efficient over the entire frequency band allocated

Stanislav Licul; Joseph A. N. Noronha; William A. Davis; Dennis G. Sweeney; Christopher R. Anderson; T. M. Bielawa

2003-01-01

135

UCom: Ultra-wideband Communications in Harsh Propagation Environments  

SciTech Connect

LLNL has developed an ultra-wideband (UWB) system that provides unique, through-the-wall wireless communications in heavy metallic and heavy concrete indoor channels. LLNL's UWB system is the only available wireless communications system that performs successfully and reliably in facilities where conventional narrowband communications usually fail due to destructive reflections from multiple surfaces. These environments include: cargo ships and reinforced, heavy concrete buildings. LLNL's revolutionary system has applications for the military, as well as commercial indoor communications in multistory buildings, and cluttered industrial structures.

Nekoogar, F

2007-03-14

136

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

137

Fusion of magnetic resonance imaging and ultra-wideband-radar for biomedical applications  

Microsoft Academic Search

Due to the recent advances in ultra-wideband (UWB)-radar technologies, there has been widespread interest in medical applications of this technology. We propose the multimodal combination of magnetic resonance (MR) and UWB-radar for improved functional diagnosis and imaging. A demonstrator was established to prove the feasibility of simultaneous acquisition of physiological events by magnetic resonance imaging and UWB-radar.

Florian Thiel; Matthias Hein; Ulrich Schwarz; Jürgen Sachs; Frank Seifert

2008-01-01

138

Effects of location and room height on ultra wideband propagation around the human body  

Microsoft Academic Search

Radio propagation has been intensively studied for recently-emerging wireless body area network (WBAN) applications. To facilitate high-speed WBAN, ultra wideband (UWB) is a promising technology because of its low power consumption and anti-multipath capabilities. The authors have focused UWB (typically 3.1 to 10.6 GHz) propagation measurements around the human body in various environments. A new UWB propagation loss model was

M. Koiwai; T. Kobayashi

2011-01-01

139

Ultra-wideband noise radar based on optical waveform generation  

NASA Astrophysics Data System (ADS)

A microwave-photonic, ultra-wideband (UWB) noise radar system is proposed and demonstrated. The system brings together photonic generation of UWB waveforms and fiber-optic distribution. The use of UWB noise provides high ranging resolution and better immunity to interception and jamming. Distribution over fibers allows for the separation the radar-operating personnel and equipment from the location of the front-end. The noise waveforms are generated using the amplified spontaneous emission that is associated with stimulated Brillouin scattering in a standard optical fiber, or with an erbium-doped fiber amplifier. Our experiments demonstrate a proof of concept for an integrated radar system, driven by optically generated UWB noise waveforms of more than 1 GHz bandwidth that are distributed over 10 km distance. The detection of concealed metallic object and the resolving of two targets with the anticipated ranging resolution are reported.

Grodensky, Daniel; Kravitz, Daniel; Zadok, Avi

2012-05-01

140

Daredevil: ultra-wideband radar sensing for small UGVs  

NASA Astrophysics Data System (ADS)

We are developing an ultra wideband (UWB) radar sensor payload for the man-portable iRobot PackBot UGV. Our goal is to develop a sensor array that will allow the PackBot to navigate autonomously through foliage (such as tall grass) while avoiding obstacles and building a map of the terrain. We plan to use UWB radars in conjunction with other sensors such as LIDAR and vision. We propose an algorithm for using polarimetric (dual-polarization) radar arrays to classify radar returns as either vertically-aligned foliage or solid objects based on their differential reflectivity, a function of their aspect ratio. We have conducted preliminary experiments to measure the ability of UWB radars to detect solid objects through foliage. Our initial results indicate that UWB radars are very effective at penetrating sparse foliage, but less effective at penetrating dense foliage.

Yamauchi, Brian

2007-05-01

141

Gaussian Monocycle Pulse Transmitter Using 0.18 CMOS Technology With On-Chip Integrated Antennas for Inter-Chip UWB Communication  

Microsoft Academic Search

A single-chip Gaussian monocycle pulse (GMP) transmitter using 0.18 mum CMOS technology with an on-chip integrated antenna was developed for inter-chip ultra-wideband (UWB) communication. Ultra-short GMP signals of 280 ps duration, -20.2 dB ringing level and 3.6 GHz center frequency were generated with the power consumption of 12.6 mW at 1.8 V. Intra- and inter-chip transmissions and receptions of the

Takamaro Kikkawa; Pran Kanai Saha; Nobuo Sasaki; Kentaro Kimoto

2008-01-01

142

UWB dual burst transmit driver  

SciTech Connect

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

143

Design of a pulse sensor to detect medium activity in UWB networks  

Microsoft Academic Search

Impulse-based ultra wideband (I-UWB) is an attractive radio technology for large ad hoc and sensor networks due to its robustness to multipath effects, sub-centimeter ranging ability, simple hardware, and low radiated power. Current medium access control (MAC) protocols for I-UWB target small wireless personal area networks (WPANs) and cellular networks, but they are not suitable for large, multihop ad hoc

N. J. August; Hyung-Jin Lee; Dong Sam Ha

2005-01-01

144

A survey of antennas for ultra-wideband applications  

NASA Astrophysics Data System (ADS)

The usage of ultra-wideband (UWB) technology is growing in many communication systems such as radar systems, communication and measurement systems and imaging systems mainly because unlike the other wireless technologies UWB is not restricted to using a narrow waveband and it has high speed data rate. The large transmission bandwidth makes UWB-based electronic device resistive to interferences and gives immunity against getting detected. Typical operational frequency range of the UWB devices varies from few 100s MHz to 10 GHz. However, the most popular UWB devices are designed to operate between 1-3 GHz. This paper presents an overview of different types of commercially available antennas suitable for UWB applications. The paper begins with the basics of understanding of antennas properties. Next, it discusses the main antenna characteristics like: radiation pattern (directional or omni-directional), gain, bandwidth, size, etc for different UWB applications and explains criterions for quantitative and qualitative performance measure of the antennas. The antennas covered in this paper include: TEM Horn, Folded horn, Dipole, Planner Fat Dipole, Cross Dipole, Rolled Dipole, UWB dielectric, Bowtie, Wire Bowtie, etc. This paper describes the pros and cons of each antenna and highlights the application areas of each antenna. Lastly, this paper summaries the important characteristics of the antennas and presents several promising directions for future enhancement of UWB antenna systems.

Sarfaraz, Maysam; Shirkhodaie, Amir

2008-05-01

145

On the Design of Ultra Wideband FCC Compliant Integrated Radars  

Microsoft Academic Search

In this paper the design of a simple monostatic impulse radar is analyzed. The well known radar equations are revised accounting for the FCC rules. The required radar performances are quickly translated into the pulse parameters to obtain an FCC compliant radar. The effects of two major system weaknesses are also investigated: the effects of the ultra wideband channel and

Alessio Cacciatori; L. Colalongo; Z. Miklos; K. Vajna

2006-01-01

146

Practical search strategy for ultra wideband signal acquisition in the dense multipath channel  

Microsoft Academic Search

In a previous work the authors proposed a search strategy based on the golden section for coarse acquisition of ultra wideband (UWB) signals in the dense multipath channel. The proposed method achieved practically the minimum mean acquisition time under a simplistic model. In this paper those results are extended by showing that the golden section strategy is especially advantageous when

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

2006-01-01

147

Effective Packet Scheduling with Fairness Adaptation in Ultra Wideband Wireless Networks  

Microsoft Academic Search

The inherent spread spectrum nature in ultra- wideband (UWB) communications can support simultaneous transmissions. Two nearby transmissions do not collide, but rather generate interference to each other, thus requiring dif- ferent coordination mechanisms from those in the single-channel case. This research is to design effective packet scheduling to determine when, where, and how to allow simultaneous transmissions, and how to

Hai Jiang; Weihua Zhuang

2006-01-01

148

Low-complexity training for rapid timing acquisition in ultra wideband communications  

Microsoft Academic Search

Rapid timing acquisition with low complexity constitutes a major challenge in realizing the high potential ultra wideband (UWB) technology promises for indoor wireless communications. We design and test such a timing acquisition algorithm based on training symbols. Relying on a judiciously designed preamble, our algorithm achieves clock synchronization at the receiver using simple integrate-and-dump operations over the symbol duration. Analysis

Liuqing Yang; Georgios B. Giannakis

2003-01-01

149

Performance Analysis of Channel Shortening of RAKE Receiver in Ultra-Wideband Systems  

Microsoft Academic Search

In this paper, the performance of RAKE receiver on channel shortening in ultra-wideband (UWB) systems is studied by analyzing the impact of inter-symbol interference (ISI) on the bit error rate (BER) error floor in dense multipath channel environments. A closed form expression for BER with Nakagami channel model is developed. The equivalent channel length after RAKE receiver is derived by

Liang Zhang; Chenyang Yang

2006-01-01

150

Modified Chirp Waveforms for Cognitive Ultra Wideband Radio - Work in Progress  

Microsoft Academic Search

Cognitive Radio (CR) is an intelligent wireless communication system which is aware of its environment and can adjust its spectrum to utilize the frequency holes in the wireless environment. By this way, a highly efficient utilization of the radio resource can be achieved. We propose a novel CR modulation method that is based on the Ultra-wideband (UWB) chirp waveform in

Hanbing Shen; Weihua Zhang; Kyung Sup Kwak

2007-01-01

151

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

152

System Analysis of Ultra-Wideband Instrumentation Radars: Impulse vs. Stepped-Chirp Approaches.  

National Technical Information Service (NTIS)

As part of an ongoing effort to determine the utility of ultra-wideband (UWB) radar systems for military application, an experimental program was developed and executed to collect terrain clutter data using high resolution waveforms in the ultra high freq...

J. Ralston

1993-01-01

153

RoF Delivery over PONs of Optically Shaped UWB Signals for Gigabit\\/s Wireless Distribution in the Home  

Microsoft Academic Search

We propose and experimentally demonstrate gen- eration and distribution of optimally power efficient impulse- radio ultra-wideband (IR-UWB) waveforms over passive optical networks (PONs) for high bit rate wireless data distribution in the home. We use a reconfigurable UWB pulse generator in the context of radio over fiber delivery over a PON for fiber to the home\\/premises services. The single mode

Mohammad Abtahi; Leslie A. Rusch

2011-01-01

154

Performance analysis of ultra-wideband antennas for microradar applications  

NASA Astrophysics Data System (ADS)

This paper presents three different types of ultra-wideband (UWB) antennas for RF micro-radar applications in range of 1-3 GHz and discusses performance characteristics of each antenna. The electromagnetic radiation properties of antennas are analyzed based on their gain, bandwidth, voltage standing wave ratio (VSWR), conductivity, and form and size factors. In addition, the performance of each antenna is investigated with different feed line configuration to determine influence of feed line configuration upon the performance of each UWB antenna. The antennas were modeled using electromagnetic simulation software, FEKO. The software simulates the performance of each antenna via Method of Moment (MoM) technique that is a powerful method for analysis of electromagnetic radiation characteristics of RF antennas. This paper presents the simulation-based performance comparison of the three selected UWB antennas under the same operational bandwidth.

Sarfaraz, Maysam; Shirkhodaie, Amir; Mitra, Atindra

2009-05-01

155

A novel orthogonal linearly polarized directional antenna for ultra wideband applications  

Microsoft Academic Search

In this paper, a novel ultra wideband (UWB) Vee dipole antenna with dual linear orthogonal polarization is introduced. The antenna consists of a 4-arm Vee dipole antenna with a novel arm shape fed by two coaxial cables with UWB baluns. The antenna occupies a volume of (0.44 ?L × 0.44 ?L × 0.44 ?L) without the coaxial balun. The boresight

Abdelhalim Mohamed; Lotfollah Shafai

2010-01-01

156

A MULTI-BANDED SYSTEM ARCHITECTURE FOR ULTRA-WIDEBAND COMMUNICATIONS  

Microsoft Academic Search

The FCC ruling in 2002 allowing for the unlicensed deployment of ultra-wideband (UWB) devices for communications purposes in the 3.1-10.6 GHz hand has sparked great interest in the industry. In particular, the IEEE 802.15.3a task group is currently developing a standard for high-rate, short-range wireless communication systems that is expected to use UWB technology. One of the main challenges for

Jefiey R. Foerster; V. Somayazulu; Sumit Roy

2009-01-01

157

Ultra wideband signal impact on IEEE802.11b 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

Matti Hämäläinen; Jani Saloranta; Juha-Pekka Mäkelä; Ian Oppermann; Tero Patana

2003-01-01

158

System-on-package ultra-wideband transmitter using CMOS impulse generator  

Microsoft Academic Search

In this paper, a low-cost CMOS ultra-wideband (UWB) impulse transmitter module with a compact form factor is proposed for impulse-radio communications. The module consists of a CMOS impulse generator, a compact bandpass filter (BPF), and a printed planar UWB antenna. The impulse generator is designed using a Samsung 0.35-?m CMOS process for low-cost and low-power fabrication. The measurement shows the

Junwoo Lee; Young-Jin Park; Myunghoi Kim; Changwook Yoon; Joungho Kim; Kwan-Ho Kim

2006-01-01

159

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

160

Non-data aided timing acquisition of ultra-wideband transmissions using cyclostationarity  

Microsoft Academic Search

Low-complexity rapid timing acquisition constitutes a major challenge in realizing the high potential that ultra-wideband (UWB) wireless technology promises for indoor communications. We derive and test two such timing acquisition algorithms which capitalize on the cyclostationarity that is naturally present in UWB transmissions. Our novel schemes are blind, they do not require multiple antennas or oversampling, and rely on frame-rate

Liuqing Yang; Zhi Tian; Georgios B. Giannakis

2003-01-01

161

Spatial-Temporal Combining-Based ZF Detection in Ultra-Wideband Communications  

Microsoft Academic Search

The performance of ultra-wideband (UWB) multiple input multiple output (MIMO) receiver based on the RAKE maximal ratio combiner (MRC) followed by a zero forcing (ZF) detector is analytically examined. For a UWB MIMO system with NT transmit antennas, NR receive antennas, and L resolvable multipath components, the proposed MIMO detection scheme is shown to have the diversity order of LNR-NT+1

Jinyoung An; Sangchoon Kim

2009-01-01

162

Tomographic imaging with ultra-wideband noise radar using time-domain data  

NASA Astrophysics Data System (ADS)

This paper investigates the feasibility of using a noise waveform in an ultra-wideband (UWB) radar system for two-dimensional tomographic imaging of a stationary object with a multistatic tomographic geometry. Multiple UWB transmitters and receivers are positioned along each side of the imaging area. We perform several numerical simulations in time-domain, and the successful imaging of the target is achieved by visual inspection of the formed images.

Shin, Hee Jung; Narayanan, Ram M.; Rangaswamy, Muralidhar

2013-05-01

163

Fusing ultra-wideband radar and lidar for small UGV navigation in all-weather conditions  

Microsoft Academic Search

Autonomous small UGVs have the potential to greatly increase force multiplication capabilities for infantry units. In order for these UGVs to be useful on the battlefield, they must be able to operate under all-weather conditions. For the Daredevil Project, we have explored the use of ultra-wideband (UWB) radar, LIDAR, and stereo vision for all-weather navigation capabilities. UWB radar provides the

Brian Yamauchi

2010-01-01

164

Photonic generation of power-efficient FCC-compliant ultra-wideband waveforms using semiconductor optical amplifier (SOA): theoretical analysis and experiment verification  

NASA Astrophysics Data System (ADS)

We theoretically design a power-efficient ultra-wideband pulse generator by combining three monocycle pulses with different weights. We also experimentally demonstrate a feasible scheme to generate such power-efficient ultra-wideband waveforms using cross-phase modulation in a single semiconductor optical amplifier. The designed ultra-wideband pulse fully satisfies the requirements for the spectral mask specified by the Federal Communications Commission with high power efficiency. In the experiment, a power-efficient ultra-wideband waveform with a pulse duration of 310 ps is achieved, and the power efficiency is greatly improved compared with that of a single monocycle pulse or a mixture of two monocycles.

Dong, Jian-Ji; Luo, Bo-Wen; Huang, De-Xiu; Zhang, Xin-Liang

2012-04-01

165

Transform domain communication system as an ultra-wideband radar  

NASA Astrophysics Data System (ADS)

Traditionally, ultra-wideband radars increase bandwidth by using shorter pulses. However, by decreasing the pulse width, the power on target decreases and radar detection probabilities decrease. Therefore, new approaches to increase bandwidth are needed that still have adequate power on target. One radical new approach is to use a Transform Domain Communication System (TDCS) as an ultra-wideband radar. The primary advantage of this technique is that it has properties similar to Gaussian noise meaning that the radar would improve bandwidth similar to pseudo-noise (PN) sequences. Also, based on the number of carriers used to generate the TDCS code, multiple pulses can be made mutually orthogonal. This orthogonality can be exploited to effectively increase the maximum unambiguous range for pulse-Doppler radars up to the range of the horizon. In essence, TDCS radar possesses a high pulse repetition frequency (PRF) for velocity estimation and large unambiguous range.

Nunez, Abel S.; Caldwell, James T.

2005-05-01

166

A CMOS UWB transmitter for possible use for medical and biological imaging based on radio-wave induced ultrasound.  

PubMed

Medical and biological imaging based on radio-wave induced ultrasound with a single source capable of irradiating multiple signals of different frequencies simultaneously can be implemented using ultra-wideband (UWB) technique. Development of a low-cost miniature UWB CMOS transmitter that can be used for this medical application is presented. The UWB transmitter designed using a 0.25-µm CMOS process can generate and transmit both monocycle pulses from 140 to 350 ps and impulses from 100 to 300 ps which contain many concurrent frequencies such as 3.1-10.6 GHz of the UWB spectrum. PMID:24110982

Nguyen, Andrew; Nguyen, Cam

2013-07-01

167

Performance enhancement of differential UWB autocorrelation receivers under ISI  

Microsoft Academic Search

The autocorrelation receiver (AcR) is a suboptimum, low-complexity receiver architecture particularly suited to ultra-wideband (UWB) communication systems. As the bit rate increases, interference among pulses due to multipath propagation causes serious impairments of the AcR's performance. To mitigate this effect, we propose an appropriate design of the chip code and of the delay hopping (DH) code. We provide conditions to

Marco Pausini; Gerard J. M. Janssen; Klaus Witrisal

2006-01-01

168

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

169

Compact Ultra-wideband Microstrip Antenna with Metamaterials  

NASA Astrophysics Data System (ADS)

An improved compact ultra-wideband (UWB) microstrip antenna with metamaterials is proposed. The total size is slightly reduced and the measured impedance bandwidth operates from 3.84 to 22.77 GHz for a return loss of less than -10 dB. Compared with the original patch antenna, the bandwidth of this antenna is about six times broader. Moreover, the antenna has an average gain of 6.2 dB, which is 1.2 dB larger than the original one. Both strong radiation in the horizontal direction and practical characteristics are observed. Thus, this antenna would have some specific applications for UWB wireless communications in the future.

Xiong, Han; Hong, Jin-Song; Zhu, Qing-Yi; Jin, Da-Lin

2012-11-01

170

Ultra-wideband 4 × 4 Phased Array Containing Exponentially Tapered Slot Antennas and a True-Time Delay Phase Shifter at UHF  

NASA Astrophysics Data System (ADS)

For angular scanning a true-time array is developed for UHF ultra-wideband (UWB) applications in time and/or frequency domain. It is based on a 4 × 4 array with antipodal exponentially tapered slot antennas (ETSA, Vivaldi) and a 3-bit phase shifter. Distances of antenna elements are designed to be compromise between gain, scanning angle, side/grating lobe levels. The uniform spaced and fed array maximizes the overall gain. After defining the antenna shape, corrugations are introduced to improve antenna matching and gain pattern. Nine equally spaced beam positions for a 90° scanning angle are induced by an optimized 3-bit phase shifter on high permittivity substrate, while 4 bits are usually needed. Parasitic resonances are avoided by using PIN diodes in single pole double throw configuration. All components and the complete array system are simulated and verified in frequency domain with good agreement. Adaptation to UWB pulses is possible.

Schmitz, J.; Jung, M.; Bonney, J.; Caspary, R.; Schüür, J.; Schöbel, J.

171

Synthesis of ultra-wideband bandpass filter prototype with multi-stage SIRs and short-circuited stubs loaded at ports  

Microsoft Academic Search

A new filter prototype consisting of multistage one-wavelength stepped-impedance resonators (SIRs) and two short-circuited stubs located at both ends was proposed based on the synthesis theory to achieve an ultra-wideband passband filter. With this prototype, a ultra-wideband bandpass (UWB) filter with the fractional bandwidth of 110% was synthesized to meet FCC's (Federal Communications Commission) outdoor frequency mask. The measured frequency

Chun-Ping Chen; Hiroshige NIHEI; Zhewang Ma; Tetsuo ANADA; Deming Xu

2008-01-01

172

SoC CMOS UWB Pulse Radar Sensor for Contactless Respiratory Rate Monitoring.  

PubMed

An ultra wideband (UWB) system-on-chip radar sensor for respiratory rate monitoring has been realized in 90 nm CMOS technology and characterized experimentally. The radar testchip has been applied to the contactless detection of the respiration activity of adult and baby. The field operational tests demonstrate that the UWB radar sensor detects the respiratory rate of person under test (adult and baby) associated with sub-centimeter chest movements, allowing the continuous-time non-invasive monitoring of hospital patients and other people at risk of obstructive apneas such as babies in cot beds, or other respiratory diseases. PMID:23852548

Zito, D; Pepe, D; Mincica, M; Zito, F; Tognetti, A; Lanata, A; De Rossi, Danilo

2011-12-01

173

A Comprehensive Evaluation of Joint Range and Angle Estimation in Ultra-Wideband Location Systems for Indoors  

Microsoft Academic Search

Fine time resolution enables Ultra-Wideband (UWB) ranging systems to reliably extract the first multipath arrival corresponding to the range between a transmitter and receiver, even when attenuated in strength compared to later arrivals. Bearing systems alone lack any notion of time and in general select the arrival coinciding with the strongest path, which is rarely the first one in non

Camillo Gentile; A. Judson Braga; Alfred Kik

2008-01-01

174

Towards a design of the ultra-wideband microwave devices using the non-foster negative reactances  

Microsoft Academic Search

A novel simple and efficient approach to a design of the ultra-wideband (UWB) microwave devices using the non-Foster negative reactances implemented as the transistor negative impedance converters is presented. Series as well as parallel connection of the positive inductance and negative capacitance (or vice versa) allows providing the sum reactance with only a small variation over a wide frequency band.

Dmitry V. Kholodnyak; Viacheslav M. Turgaliev

2012-01-01

175

Capacity-maximizing resource allocation for data-aided timing and channel estimation in ultra-wideband radios  

Microsoft Academic Search

The overall system performance of data-aided ultra-wideband (UWB) communications relies critically on the accuracy of synchronization and channel estimation during the training phase. The total transmission resources should be properly allocated between training and information symbols in order to strike a desired balance between performance and information rate. To this end, this paper derives optimum transmission schemes that judiciously allocate

Lin Wu; Zhi Tian

2004-01-01

176

A review on modulation techniques in multiband-orthogonal frequency division multiplexing in ultra-wideband channel  

Microsoft Academic Search

This paper describes a review on mapping or modulation techniques used in multiband orthogonal frequency division multiplexing (MB-OFDM) in ultra- wideband (UWB) channel. QAM, BPSK and QPSK modulation techniques are commonly used in this system due to their smooth power spectrum, low bit error rate (BER) and low receiver complexity. The new constant envelop modulation technique is proposed since it

Chempaka Mohd Din; Wahidah Mansor; Roslina Mohamad

2011-01-01

177

A Two-Step Time of Arrival Estimation Algorithm for Impulse Radio Ultra Wideband Systems  

Microsoft Academic Search

High time resolution of ultra wideband (UWB) signals facilitates very precise positioning capa- bilities based on time-of-arrival (TOA) measurements. Although the theoretical lower bound for TOA estimation can be achieved by the maximum likelihood principle, it is impractical due to the need for extremely high-rate sampling and large number of multipath components. On the other hand, the conventional correlation-based algorithm,

Sinan Gezici; Zafer Sahinoglu; Andreas F. Molisch; Hisashi Kobayashi; H. Vincent Poor

2005-01-01

178

Ultra-wideband duplexers for low and high peak power applications  

Microsoft Academic Search

Two different duplexers have been conceived, designed and tested that allow for using an impulse ultra-wideband (UWB) radar in a monostatic configuration. The first one, which is based on a fast GaAs SPDT switch, is usable with a low peak power transmitter (<100 mW), while the second one, completely passive, is intended for high peak power applications (up to 50

M. Piette

1998-01-01

179

An Ultra-Wideband Impulse-Radio Communication Method and Transceiver  

Microsoft Academic Search

The present paper describes the physical layer of an ultra-wideband impulse radio (UWB-IR) communication system, together with its implementation in a fully integrated transceiver. The objective of this work was to design and test a low-power radio communication system for medium data-rate, short-range communication. The system is based on frequency hopping on-off keying modulation (FH-OOK) for transmission, combined with a

Emil Novakov; Jean-Michel Fournier

2009-01-01

180

A CMOS low-noise amplifier with impedance feedback for ultra-wideband wireless receiver system  

Microsoft Academic Search

In this paper, a CMOS low-noise amplifier (LNA) is designed for ultra-wideband (UWB) wireless receiver system. The design consists of a wideband input impedance matching network, a cascoded amplifier with shunt-peaked load, a RLC-impedance feedback loop and an output buffer for measurement purpose. It is fabricated in TSMC 0.18 um standard RF CMOS process. The LNA gives 11.5 dB maximum

Zhe-Yang Huang; Che-Cheng Huang; Chun-Chieh Chen; Chung-Chih Hung; Christina F. Jou

2008-01-01

181

Permittivity-matched compact ceramic ultra-wideband horn antennas for biomedical diagnostics  

Microsoft Academic Search

Ultra-wideband (UWB) biomedical radar systems are an important means for the diagnostic inspection and monitoring of physiological signatures. Geometrically small antennas and high-resolution imaging techniques are required for such appli- cations. We have analysed the time-domain reflection and trans- mission characteristics of compact ceramic double-ridged horn antennas, developed for contact-mode measurements with a permittivity matched to human tissues. Preliminary volunteer

F. Scotto di Clemente; M. Helbig; J. Sachs; U. Schwarz; R. Stephan; M. A. Hein

2011-01-01

182

A Novel Modulation Waveform on Ultra-Wideband Based Cognitive Radio Systems  

Microsoft Academic Search

Cognitive radio (CR) permits to satisfy the necessity of more efficiency in the radio spectrum occupation. An important task of CR is dynamic spectrum management of the transmitted signal to avoid the interference to\\/from the existent licensed in-band applications. We propose an adaptive modulation waveform for ultra-wideband (UWB) based CR systems in this paper. By controlling the time intervals between

Weihua Zhang; Hanbing Shen; Zhiquan Bai; Kyung Sup Kwak

2007-01-01

183

On Ultra-Wideband MIMO Systems with 1-bit Quantized Outputs: Performance Analysis and Input Optimization  

Microsoft Academic Search

We study the performance of multi-input multi-output (MIMO) channels with coarsely quantized outputs in the low signal-to-noise ratio (SNR) regime, where the channel is perfectly known at the receiver. This analysis is of interest in the context of Ultra-Wideband (UWB) communications from two aspects. First the available power is spread over such a large frequency band, that the power spectral

Amine Mezghani; Josef A. Nossek

2007-01-01

184

Ultra-wideband circular polarized microstrip Archimedean spiral antenna loaded with chip-resistor  

Microsoft Academic Search

In this paper, an ultra-wideband (UWB) right hand circular polarized (RHCP) low-profile microstrip Archimedean spiral antenna operating with a chip-resistor load is presented. The radiating spiral patch is implemented on a typical FR4 printed circuit board (PCB) and is center fed through an SMA surface-mount connector. A chip-resistor loading at the outer edge of the spiral provides an excellent bandwidth

Christos Kinezos; Vichate Ungvichian

2003-01-01

185

A Simple Ultra-Wideband Wake-up Scheme for SemiActive Sensor Nodes  

Microsoft Academic Search

Ultra-wideband impulse radio (UWB-IR) merges low complexity system design with good localization capabilities enabling low-data-rate\\/location-tracking (LDR\\/LT) sensor network design. However power consumption of the sensor nodes is a fundamental problem. Therefore, a simple wake-up scheme for asymmetric network topologies is investigated, where a static wireless backbone communicates with many semi-active sensor nodes. At sensor side only a low power wake-up

Florian Troesch; A. Wittneben

2006-01-01

186

Effective notch Ultra-Wideband filter using ring resonator for the rejection of IEEE 802.11a  

Microsoft Academic Search

This paper proposes Ultra-Wideband (UWB) bandpass filters with dual notched band for the purpose of avoiding the interference between the UWB radio system and the existing WLAN system. The 5 GHz WLAN (Wireless Local Area Network) IEEE 802.11a exists in 5.15-5.35 GHz and 5.725-5.825 GHz which are called as lower and upper band respectively. The filter is based on ring

K. Thirumalaivasan; R. Nakkeeran; S. O. Coumar

2010-01-01

187

Ultra-Wideband Signal Impact on the Performances of IEEE 802.11b and Bluetooth Networks  

Microsoft Academic Search

This paper presents the results of a coexistence study investigating the impact of ultra-wideband (UWB) interference on IEEE 802.11b and Bluetooth networks. The results are based on the experimental test measurements made at the University of Oulu, Finland. Simple high-power UWB transmitters are used to interfere with victim networks. Preliminary results show that only under extreme interference conditions with thousands

Matti Hämäläinen; Jani Saloranta; Juha-pekka Mäkelä; Ian Oppermann; Tero Patana

2003-01-01

188

Multi-aspect detection of surface and shallow-buried unexploded ordnance via ultra-wideband synthetic aperture radar  

Microsoft Academic Search

An ultra-wideband (UWB) synthetic aperture radar (SAR) system is investigated for the detection of former bombing ranges, littered by unexploded ordnance (UXO). The objective is detection of a high enough percentage of surface and shallow-buried UXO, with a low enough false-alarm rate, such that a former range can be detected. The physics of UWB SAR scattering is exploited in the

Yanting Dong; Paul R. Runkle; Lawrence Carin; Raju Damarla; Anders Sullivan; Marc A. Ressler; Jeffrey Sichina

2001-01-01

189

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 (5.15–5.825 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.

Rotaru, Mihai; Sykulski, Jan

2010-01-01

190

Pulse generator for UWB communication and radar applications with PPM and time hopping possibilities  

Microsoft Academic Search

Two simple and compact ultra-wideband, ultra-short-pulse transmitters have been developed using a monolithic microwave integrated circuit (MMIC). These pulse generators include a digital approach for the pulse forming based on a logic gate. They produce pulses with a variable width as low as 65 ps and rise and fall time about 25 ps (measured). The pulse position modulation (PPM) with

N. Deparis; C. Loyez; N. Rolland; P.-A. Rolland

2006-01-01

191

Non-invasive respiration rate estimation using ultra-wideband distributed cognitive radar system.  

PubMed

It has been shown that remote monitoring of pulmonary activity can be achieved using ultra-wideband (UWB) systems, which shows promise in home healthcare, rescue, and security applications. In this paper, a geometry-based statistical channel model is developed for simulating the reception of UWB signals in the indoor propagation environment. This model enables replication of time-varying multipath profiles due to the displacement of a human chest. Subsequently, a UWB distributed cognitive radar system (UWB-DCRS) is developed for the robust detection of chest cavity motion and the accurate estimation of respiration rate. The analytical framework can serve as a basis in the planning and evaluation of future measurement programs. PMID:17945609

Chen, Yifan; Gunawan, Erry; Low, Kay Soon; Kim, Yongmin; Soh, Cheong Boon; Leyman, A Rahim; Thi, Lin Lin

2006-01-01

192

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

DOEpatents

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

193

Ultra-wideband phased antenna arrays  

Microsoft Academic Search

A new type of ultra-wideband nonuniformly spaced antenna array is designed. So-called modified FCAA can work at a frequency band of up to 10:1. Under multiple frequency change the FCAA ensures the uniqueness of the main lobe in the space, constancy of the peak sidelobe level and directivity

Bohdan V. Koval

2001-01-01

194

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

195

Anti-interference ultra-wideband system based on spreading and interleaving * * This project was supported by the National “863” High Technology Research Program of China (2005AA123320) and Universities Natural Science Research Project of Jiangsu Province (05KJB510101)  

Microsoft Academic Search

To suppress the interference in the ultra-wideband (AI-UWB) system is a challenging problem. An anti-interference multiband orthogonal frequency-division multiplexing ultra-wideband (AI-UWB) system, based on spreading and interleaving is addressed. It will exploit the frequency diversity across the subcarriers and provide the robustness to narrow-band interference, by spreading the coded bit streams within each sub-band and interleaving across all sub-bands. Simulating

Zhang Shibing; Zhang Lijun

2007-01-01

196

The physical foundation, developmental history, and ultra-wideband performance of SMM (spiral-mode microstrip) antennas  

Microsoft Academic Search

The paper reviews the physical foundation, developmental history, and ultra-wideband (UWB) performance of the SMM (spiral-mode microstrip) antenna (Wang, J.J.H. and Tripp, V.K., 1996; Wang, 1997; Wang et al., 2005). The paper is inspired by the recent article on self-complementary (SC) antennas by Y.Mushiake (see IEEE Antennas and Propag. Magazine, vol.46, 2004; IEEE Antennas and Propag. Symp. Dig., 2003), and

Johnson J. H. Wang

2005-01-01

197

Planar Ultra-Wideband Antennas in Ku- and K-Band for Pattern or Polarization Diversity Applications  

Microsoft Academic Search

Two planar diversity antennas operating in Ku- (12.4–18 GHz) and K-band (18–26.5 GHz) are proposed for ultra-wideband (UWB) applications. Both of them consist of a monopole radiating element and two orthogonal feeding ports. Their ground planes are modified and optimized to improve the isolation as well as to control the radiation. The first one is a pattern diversity antenna with

Yuandan Dong; Tatsuo Itoh

2012-01-01

198

The performance of ultra wideband acquisition system based on energy detection over IEEE 802.15.3a channel  

Microsoft Academic Search

In this paper, we propose a theoretical framework to analyze the performance of ultra wideband acquisition (UWB) system based\\u000a on energy detection (ED) over IEEE 802.15.3a channel. The proposed framework enables to calculate probability density function\\u000a (PDF) of square-sum of multipath components (MPCs) gain collected by receiver, and the averaged criteria. In particular, the\\u000a expectation and variance of the sum

ZhiHua Yang; QinYu Zhang; NaiTong Zhang; Ye Wang

2011-01-01

199

Non-line of Sight Error Mitigation in Ultra-wideband Ranging Systems Using Biased Kalman Filtering  

Microsoft Academic Search

In this paper, a non-line of sight (NLOS) error mitigation method based on biased Kalman filtering for ultra-wideband (UWB)\\u000a ranging is proposed. The NLOS effect on the measures of signal arrival time is considered one of the major error sources in\\u000a range estimation and time-based wireless location systems. An improved biased Kalman filtering system, incorporated with sliding-window\\u000a data smoothing and

Chin-Der Wann; Chih-Sheng Hsueh

200

Design of an ESD-Protected Ultra-Wideband LNA in Nanoscale CMOS for Full-Band Mobile TV Tuners  

Microsoft Academic Search

This paper presents an electrostatic discharge (ESD)-protected ultra-wideband (UWB) low-noise amplifier (LNA) for full-band (170-to-1700 MHz) mobile TV tuners. It features a PMOS-based open-source input structure to optimize the I\\/O swings under a mixed-voltage ESD protection while offering an inductorless broadband input impedance match. The amplification core exploiting double current reuse and single-stage thermal-noise cancellation enhances the gain and noise

Pui-In Mak; Rui Martins

2009-01-01

201

Joint TOA and AOA\\/AOD Spectrum for Ultra-Wideband Indoor Double-Directional Channel Estimation  

Microsoft Academic Search

This paper presents an ultra-wideband (UWB) double-directional channel sounding technique using transformation between time domain (TD) and frequency domain (FD) signals. We proposed the time-of-arrival (TOA), angle-of- arrival (AOA) estimation algorithm and angle-of-departure (AOD) with some modifications of our previous work. There were four main advantages of the proposed estimation technique as follows: implementation of the simple antenna array with

Naohiko Iwakiri; Takehiko Kobayashi

2008-01-01

202

Development and testing of bulk photoconductive switches used for ultra-wideband, high-power microwave generation  

Microsoft Academic Search

The Air Force Phillips Laboratory, in collaboration with the Army Research Laboratory (ARL), is developing lateral geometry, high-power photoconductive semiconductor switches (PCSS) for use in phased-array, ultra-wideband (UWB) sources. The current switch utilizes an opposed contact geometry with a 0.25 cm gap spacing and is an extension of previous work on 1.0 cm PCSS devices. This work presents the development

J. W. Burger; J. S. H. Schoenberg; J. S. Tyo; M. D. Abdalla; S. M. Ahern; M. C. Skipper; W. R. Buchwald

1997-01-01

203

A Ultra-Wideband Amplitude Modulation (AM) Detector Using Schottky Barrier Diodes Fabricated in Foundry CMOS Technology  

Microsoft Academic Search

Utility of Schottky diodes fabricated in foundry digital 130-nm CMOS technology is demonstrated by implementing an ultra-wideband (UWB) amplitude modulation detector consisting of a low-noise amplifier (LNA), a Schottky diode rectifier, and a low-pass filter. The input and output matching of the detector is better than -10 dB from 0-10.3 GHz and 0-1.7 GHz, respectively, and almost covers the entire

Swaminathan Sankaran; Kenneth K. O

2007-01-01

204

DESIGN OF AN ULTRA-WIDEBAND, LOW-NOISE AMPLIFIER USING A SINGLE TRANSISTOR: A TYPICAL APPLICATION EXAMPLE  

Microsoft Academic Search

In this work, a design method of an Ultra-Wideband (UWB), low-noise amplifler (LNA) is proposed exerting the perfor- mance limitations of a single high-quality discrete transistor. For this purpose, the compatible (Noise F, Input VSWR Vi, Gain GT) triplets and their (ZS, ZL) terminations of a microwave transistor are exploited for the feasible design target space with the minimum noise

Salih Demirel; F. Gune; Ufuk Ozkaya

2009-01-01

205

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

206

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

207

Miniature double-ridged horn antennas composed of solid high-permittivity sintered ceramics for biomedical ultra-wideband radar applications  

Microsoft Academic Search

Ultra-wideband (UWB) radar sensors are attracting more and more attention, e.g., for biomedical applications. In contrast to established techniques like X-ray tomography or invasive diagnostic approaches, UWB radar offers the potential for remote access and ultra-low power signal intensities. Inspired by promising studies of breast tumor imaging, we are continuing and extending our previous work on biomedical M-sequence radar and

Ulrich Schwarz; Ralf Stephan; Matthias A. Hein

2010-01-01

208

Analysis of Ultra-wideband Impulse Radio Over Multimode Fiber Ranging System  

Microsoft Academic Search

\\u000a Ultra-wideband impulse radio (UWB-IR)-based systems are well known for their inherent capability to provide accurate ranging\\u000a [1–3]. Remote positioning of such systems using Radio over MultiMode Fiber (RoMMF) technology is advantageous, for it provides\\u000a a cost-effective way of system deployment by the consolidation of head-end equipment. In this chapter, we describe the details\\u000a of a system model for evaluating the

J. George; D. Thelen; A. Chamarti; A. Ng’oma; M. Sauer

2010-01-01

209

The GIMLI: A Compact High-Power UWB Radiation Source  

Microsoft Academic Search

\\u000a This chapter presents the design and performances of a compact, general-purpose, high-power ultra-wideband (UWB) source named\\u000a GIMLI. The system was designed for dual use, homeland security and military applications. It is powered by a compact, coaxial\\u000a 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\\u000a sharpened using

P. Delmote; B. Martin

2010-01-01

210

47 CFR 15.507 - Marketing of UWB equipment.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Marketing of UWB equipment. 15.507 Section...Ultra-Wideband Operation § 15.507 Marketing of UWB equipment. In some cases...auspices of a state or local government. The marketing of UWB devices must be directed...

2012-10-01

211

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

212

Fiber-connected UWB sensor network for high-resolution localization using optical time-division multiplexing.  

PubMed

A fiber-connected ultra-wideband (UWB) sensor network for high-resolution localization which consists of a central station and several sensor nodes is proposed and demonstrated. To make the central station easily identify the received UWB pulses from different sensor nodes, optical time-division multiplexing (OTDM), realized by inserting a certain length of optical fiber between every two sensor nodes, is implemented. Due to the OTDM technology, the UWB pulses received by different sensors are mapped into different time slots, so neither parameter estimation nor clock synchronization is required in the UWB sensor node. All complex signal processing is completed in the central station, which greatly improve the localization accuracy and simplify the system. A proof-of-concept experiment for two-dimensional localization is demonstrated. Spatial resolution as high as 3.9 cm is achieved. PMID:24103995

Fu, Jianbin; Pan, Shilong

2013-09-01

213

State of the art in ultra-wideband antennas  

Microsoft Academic Search

Ultra wide-band (UWB) technology is one of the most promising solutions for future communication systems due to its high-speed data rate and excellent immunity to multipath interference. In this context, the UWB antenna design plays a unique role because it behaves like a band pass filter and reshapes the spectra of the pulses, so it should be designed to avoid

M. A. Peyrot-Solis; G. M. Galvan-Tejada; H. Jardon-Aguilar

2005-01-01

214

A 3?5 GHz low-complexity ultra-wideband CMOS RF front-end for low data-rate WPANs  

Microsoft Academic Search

This paper presents a 3-5 GHz ultra-wideband radio front-end for low data-rate wireless personal area network applications. The circuit, implemented in a 90-nm CMOS technology, includes a carried-based ultra-wideband transmitter, a sub-optimal coherent down-converter and a low-power LO signal generator. Thanks to a pseudo-Gaussian pulse generator, the transmitter is able to run up to 500 Mpps satisfying the FCC mask

Marco Cavallaro; Alessandro Italia; Giuseppina Sapone; Giuseppe Palmisano

2008-01-01

215

Ultra-wideband sensing: The road to new radar applications  

Microsoft Academic Search

Research on ultra-wideband topics started about 50 to 60 years ago driven by needs in radar and communication technology as well as to emulate EMPs of nuclear explosions. Meanwhile, ultra-wideband sensing opens new perspectives for radar applications. Small and cost effective devices, high resolution and sensitivity, as well as low exposition by radio waves will give this radar technology access

J. Sachs

2010-01-01

216

SEMICONDUCTOR INTEGRATED CIRCUITS: A 6-9 GHz ultra-wideband CMOS PA for China's ultra-wideband standard  

NASA Astrophysics Data System (ADS)

A 6-9 GHz ultra-wideband CMOS power amplifier (PA) for the high frequency band of China's UWB standard is proposed. Compared with the conventional band-pass filter wideband input matching methodology, the number of inductors is saved by the resistive feedback complementary amplifying topology presented. The output impendence matching network utilized is very simple but efficient at the cost of only one inductor. The measured S22 far exceeds that of similar work. The PA is designed and fabricated with TSMC 0.18 ?m 1P6M RF CMOS technology. The implemented PA achieves a power gain of 10 dB with a ripple of 0.6 dB, and S11 < -10 dB over 6-9 GHz, S22 < -35 dB over 4-10 GHz. The measured output power at the 1 dB compression point is over 3.5 dBm from 6 to 9 GHz. The PA dissipates a total power of 21 mW from a 1.8 V power supply. The chip size is 1.1 × 0.8 mm2.

Zhendong, Gao; Zhiqiang, Li; Haiying, Zhang

2010-09-01

217

Adaptive low-rank channel estimation for multi-band OFDM ultra-wideband communications  

NASA Astrophysics Data System (ADS)

In this paper, an adaptive channel estimation scheme based on the reduced-rank (RR) Wiener filtering (WF) technique is proposed for multi-band (MB) orthogonal frequency division multiplexing (OFDM) ultra-wideband (UWB) communication systems in multipath fading channels. This RR-WF-based algorithm employs an adaptive fuzzy-inference-controlled (FIC) filter rank. Additionally, a comparative investigation into various channel estimation schemes is presented as well for MB-OFDM UWB communication systems. As a consequence, the FIC RR-WF channel estimation algorithm is capable of producing the bit-error-rate (BER) performance similar to that of the full-rank WF channel estimator and superior than those of other interpolation-based channel estimation schemes.

Hu, Chia-Chang; Lee, Shih-Chang

2011-12-01

218

Suppression of radio frequency inteference (RFI) for synchronous impulse reconstruction ultra-wideband radar  

NASA Astrophysics Data System (ADS)

This paper is concerned with the issues associated with the suppression of radio frequency interference (RFI) for a synchronous impulse reconstruction (SIRE) ultra-wideband (UWB) synthetic aperture radar (SAR) that is currently being designed and built at the Army Research Laboratory. In this effort, we are developing the next version of the UWB radar that can employ inexpensive A/D converters to digitize wideband signals using the equivalent time sampling technique. In this presentation, we provide an analytical model for the signature of the RFI sources that are measured via an equivalent time sampling scheme. This formulation reveals spectral as well as temporal properties of the measured RFI signals that would aid a user in developing sniff (passive) data collection strategies for constructing adaptive digital signal processing methods for suppressing RFI sources.

Nguyen, Lam; Soumekh, Mehrdad

2005-05-01

219

Analysis of Ultra-wideband Impulse Radio Over Multimode Fiber Ranging System  

NASA Astrophysics Data System (ADS)

Ultra-wideband impulse radio (UWB-IR)-based systems are well known for their inherent capability to provide accurate ranging [1-3]. Remote positioning of such systems using Radio over MultiMode Fiber (RoMMF) technology is advantageous, for it provides a cost-effective way of system deployment by the consolidation of head-end equipment. In this chapter, we describe the details of a system model for evaluating the performance of a ranging system employing UWB-IR over multimode fiber. As the system uses low data rate digital communication to obtain range information, its quality can be studied using Bit Error Ratio (BER). This model combines wireless and radio over fiber sections of the system to predict system performance in terms of BER.

George, J.; Thelen, D.; Chamarti, A.; Ng'oma, A.; Sauer, M.

220

Impulse transmitting photonic antenna for ultra-wideband applications  

Microsoft Academic Search

This paper presents a new transmitting photonic antenna based on pigtailed fiber-optic photodiode module integrated with bow-tie radiator for UWB pulse generation using a gain-switched laser diode module.

A. Chizh; S. Malyshev; S. Jefremov; B. Levitas; I. Naidionova

2010-01-01

221

Low Power Digital Baseband for Impulse Radio Ultra-Wideband Transceiver  

Microsoft Academic Search

In this paper, a low power digital baseband to be used together with impulse-radio ultra wideband radio frequency front-end\\u000a has been presented. It can provide received pulse synchronization required for burst mode and low power operation. It also\\u000a overcomes clock drift issue between different transceivers. The clock and data recovery is implemented fully in digital domain\\u000a without the need of

Wei Da Toh; Yuanjin Zheng; Chun-Huat Heng

222

Programmable Photonic Microwave Filters With Arbitrary Ultra-Wideband Phase Response  

Microsoft Academic Search

We present a coherent optical signal-processing approach for synthesis of programmable microwave phase filters over an ultra-wideband. Our scheme relies on a programmable optical phase filter implemented in a pulse-shaping geometry incorporating a spatial light modulator and hyperfine (~600-MHz spectral resolution) optical spectral disperser. The user-defined optical phase filter is directly transferred to the electrical domain through heterodyne conversion, and

Shijun Xiao; Andrew M. Weiner

2006-01-01

223

Design and Development of Ultra Wideband Antennas for Various Applications  

Microsoft Academic Search

The paper summarizes results of investigations, design and development of ultra wideband antennas carried out during the last ten years in the laboratory of antennas and telecommunication systems of NTUU (\\

F. Dubrovka; S. Martynyuk

2006-01-01

224

FM-UWB for radar and communications in medical applications  

Microsoft Academic Search

UWB technology is an attractive technology for Wireless Body Area Networks. There are many advantages of using ultra-wideband (UWB) as both a sensing and a communication standard for biomedical applications: very low radiated power (-41.3 dBm\\/MHz), low power consumption, good coexistence with other existing wireless technologies, robustness to interference and multipath. Moreover, one specific UWB technology, namely Frequency Modulated (FM)-UWB,

Bharat Gupta; Daniela Valente; Ernestina Cianca; Ramjee Prasad

2008-01-01

225

An omnidirectional and low-VSWR antenna for the FCC-approved UWB frequency band  

Microsoft Academic Search

Recently, encouraged by deregulation ultra-wideband (UWB) technology has attracted attention for use in communication and sensing applications in the commercial domain. In February 2002 the Federal Communications Commission (FCC) in the United States conditionally waived unlicensed operation of the personal UWB products in the private sector. In this paper, we constructed a prototype antenna for the FCC approved UWB frequency

Takuya Taniguchi; Takehiko Kobayashi

2003-01-01

226

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

2009-03-03

227

Ultra-wideband CMOS-MEMS radio  

Microsoft Academic Search

Current ultrawideband (UWB) radios have several unsolved issues in front-end performance including difficult and expensive clock synthesizer designs, and power hungry baseband functions. In fact, the expected breakthrough of the very useful UWB technology has stalled since realized high bitrate integrated radios are much too expensive in the sense that they dissipate a lot of DC power and that their

Esa Tiiliharju; Tero Koivisto; Janne Maunu; N. Chekurovy; I. Tittoneny

2009-01-01

228

480-Mbps, BiDirectional, Ultra-Wideband Radio-Over-Fiber Transmission Using a 1308\\/1564-nm Reflective Electro-Absorption Transducer and Commercially Available VCSELs  

Microsoft Academic Search

We describe 480 Mbps, bi-directional ultra-wideband (UWB) radio signal transmission over 1 km of single-mode optical fiber. Key components are a highly linear, reflective electro absorption transducer (EAT) and commercially available 1308-nm and 1564-nm VCSELs with 4.8-GHz bandwidth. Detailed EAT and 1308-nm VCSEL distortion analyses and measurements are presented highlighting the low intermodulation and harmonic distortion necessary for typical -18-dB

Manoj Prasad Thakur; Terence James Quinlan; Carlos Bock; Stuart D. Walker; Mehmet Toycan; Sandra E. M. Dudley; David W. Smith; Anna Borghesani; David Moodie; Moshe Ran; Yossef Ben-Ezra

2009-01-01

229

A 2.76 mW, 3–10 GHz ultra-wideband LNA using 0.18 µm CMOS technology  

Microsoft Academic Search

A low-power (2.76 mW) common-gate (CG) low- noise amplifier (LNA) for ultra-wideband (UWB) systems using standard 0.18 m CMOS technology is demonstrated. Instead of the traditional single parallel inductor (LS1 only), we propose a new matching network consisting of a series LS1-RS1 in series with a parallel LS2-RS2 to enhance the input matching bandwidth. Flat and high S21 was achieved

Jin-Fa Chang; Yo-Sheng Lin

2011-01-01

230

CMOS low-noise amplifier with shunt-peaking load for group 1?3 MB-OFDM ultra-wideband wireless receiver  

Microsoft Academic Search

In this paper, a CMOS low-noise amplifier (LNA) is designed for ultra-wideband (UWB) wireless receiver system. The design consists of a wideband input impedance matching network, two stage cascode amplifiers with shunt-peaking load and an output buffer for measurement purpose. It was fabricated in UMC 0.18 mum standard RF CMOS process. The LNA provides 14.1 dB maximum power gain between

Zhe-Yang Huang; Che-Cheng Huang; Chun-Chieh Chen; Chung-Chih Hung; Christina F. Jou

2008-01-01

231

A Low-Power and low-noise 21?29 GHz ultra-wideband receiver front-end in 0.18 µm CMOS technology  

Microsoft Academic Search

This paper presents the design and analysis of a 21~29 GHz CMOS receiver front-end (RFE) in a standard 0.18 ?m CMOS process for ultra-wideband (UWB) automotive radar systems. The circuit comprises a low-noise amplifier (LNA), a double-balanced Gilbert-cell mixer, and two Marchand baluns. The performance of the mixer was improved with the current- bleeding technique and a parallel resonant inductor

Sheng-Li Huang; Yo-Sheng Lin; Jen-How Lee

2011-01-01

232

The scope of application of a reciprocity principle in the theory of antennas at radiation and reception of ultra-wideband signals  

Microsoft Academic Search

An antenna for a reception of the signals, which have spatial length much less than physical length of the antenna and the processes occurring in this antenna, are considered. On an example of the elementary antenna-the symmetric vibrator-features of ultra-wideband (UWB) signals reception are shown and dependence of a current's form in loading of the antenna from a positional relationship

A. V. Zaitsev; I. Ya. Immoreev

2004-01-01

233

Propagation studies of UWB transmission on human arm  

Microsoft Academic Search

Ultra-wideband (UWB) technology can provide very high data throughput over short distances using very low power-tens of folds lower than the best narrowband solution today. Research has proven that the UWB can be applied to realize a wireless body area network (WBANs). The combined effects of multipath and diffraction phenomena have degraded the propagation characteristics of conventional radio. In comparison,

C. T. Ong; J. Y. Hee; T. S. P. See; L. C. Ong

2008-01-01

234

UWB radar transceiver and measurement for medical imaging  

Microsoft Academic Search

Ultra-wideband radar has been considered as a good candidate for non invasive medical imaging of human body. This paper reports on prototyping, measurement methodology and results of UWB radar on phantoms and actual human body. The measurement experimentally verifies many claims made by previous papers. It sets qualifications on the performance of the UWB radar, and highlights the potential difficulties

Adrian E. C. Tan; Michael Y. W. Chia

2004-01-01

235

A detecting and identifying method for two stationary human targets using single-channel ultra-wideband radar  

NASA Astrophysics Data System (ADS)

A novel technique for single-channel ultra-wideband (UWB) radar to detect and identify two stationary human subjects in different positions is proposed in this article. To detect two stationary human targets accurately and get their life parameters precisely, space-frequency analysis is performed upon the preprocessed data in horizontal dimension and then a non-linear threshold is calculated for automatic identification. Experiments are conducted to evaluate the effectiveness of the proposed technique. In 61 data sets with two stationary human subjects, the accuracy of identification reaches 72%. The experimental results demonstrate the validity of our approach to detect and identify two stationary human subjects using single-channel UWB radar system. This technique may serve as a basis for further studies on a two-dimensional locator for multi-stationary human subjects via multi-channel UWB radar.

Zhang, Yang; Jiao, Teng; Jing, Xijing; Li, Zhao; Li, Sheng; Yu, Xiao; Lv, Hao; Zhang, Zhu; Wang, Jianqi

2012-12-01

236

Ultra Wideband (UWB) communication vulnerability for security applications  

Microsoft Academic Search

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

Cooley; H. Timothy

2010-01-01

237

Land mine detection with an ultra-wideband SAR system  

Microsoft Academic Search

PULSAR is an Ultra Wide Band (UWB) short pulse Radar developed by the CELAR (French Technical Center for Armament Electronics) and the IRCOM (Research Institute of Microwave and Optical Communications) in order to detect foliage and ground concealed mines. An instrumentation measurement system has been designed and implemented, in particular new 2D broad band antennas with a very low pulse

Joel Andrieu; Frederic Gallais; Vincent Mallepeyre; Valerie Bertrand; Bruno Beillard; Bernard Jecko; Regis Guillerey; Marc Legoff

2002-01-01

238

Real-time kinematic surveying using tightly-coupled GPS and ultra-wideband ranging  

NASA Astrophysics Data System (ADS)

Ultra-wideband (UWB) ranging radios, an emerging technology that offers precise, short distance, range measurements are investigated as a method to augment carrier-phase GPS positioning. This thesis begins with a discussion of radio-frequency based methods of augmenting high precision GPS and proposes to utilize UWB ranging technology in a tightly-coupled GPS and UWB position estimation filter. This thesis then provides an overview of UWB in the context of ranging applications and assesses the precision and accuracy of UWB ranging from both a theoretical perspective and a practical perspective using real data. Two types of commercially available UWB ranging radios are introduced which are used in testing. Actual ranging accuracy is assessed from line-of-sight testing in benign signal conditions and in outdoor testing with line-of-sight obstructions and strong reflection sources. A tightly-coupled GPS and UWB real-time kinematic (RTK) estimation method is developed and the performance of the system is evaluated in static and kinematic testing. The results of static testing show that the integrated solution provides better accuracy, better ability to resolve integer ambiguities and enhanced fixed ambiguity solution availability compared with GPS alone. The results of kinematic testing demonstrate that UWB errors can be successfully estimated in a real-time filter. In static and kinematic testing in a degraded GPS environment created by artificially inducing a 40° satellite elevation mask, subdecimetre accuracy was maintained. The tightly-coupled system is also tested to survey several external corner points of an eight story building. The tightly-coupled solution is compared to GPS-only, UWB-only, and loosely-coupled solutions. Sub-metre level solutions are maintained using tight-coupling in conditions where the solutions from the other three approaches are either unavailable or unreliable. The thesis also provides a novel and efficient method for deploying UWB reference stations and performing the RTK survey. Tightly-coupled GPS+UWB for RTK surveying is a promising new technology that extends RTK surveying to new environments. In addition, in marginal GPS-only surveying environments, position accuracy and RTK solution availability are improved substantially.

Macgougan, Glenn D.

239

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.

2011-01-01

240

Fusing ultra-wideband radar and lidar for small UGV navigation in all-weather conditions  

NASA Astrophysics Data System (ADS)

Autonomous small UGVs have the potential to greatly increase force multiplication capabilities for infantry units. In order for these UGVs to be useful on the battlefield, they must be able to operate under all-weather conditions. For the Daredevil Project, we have explored the use of ultra-wideband (UWB) radar, LIDAR, and stereo vision for all-weather navigation capabilities. UWB radar provides the capability to see through rain, snow, smoke, and fog. LIDAR and stereo vision provide greater accuracy and resolution in clear weather but has difficulty with precipitation and obscurants. We investigate the ways in which the sensor data from UWB radar, LIDAR, and stereo vision can be combined to provide improved performance over the use of a single sensor modality. Our research includes both traditional sensor fusion, where data from multiple sensors is combined in a single representation, and behavior-based sensor fusion, where the data from one sensor is used to activate and deactivate behaviors using other sensor modalities. We use traditional sensor fusion to combine LIDAR and stereo vision for improved obstacle avoidance in clear air, and we use behavior-based sensor fusion to select between radar-based and LIDAR/vision-based obstacle avoidance based on current environmental conditions.

Yamauchi, Brian

2010-04-01

241

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

2013-08-01

242

All-optical UWB pulse generation using sum-frequency generation in a PPLN waveguide.  

PubMed

We propose and demonstrate a novel approach to optically generate ultrawideband (UWB) monocycle pulses by exploiting the parametric attenuation effect of sum-frequency generation (SFG) in a periodically poled lithium niobate (PPLN) waveguide. The SFG process changes the continuous-wave pump into dark optical pulse pump with undershoot, resulting in the generation of UWB monocycle through the combination of input signal and output pump with proper relative time advance/delay. Pairs of polarity-inverted UWB monocycle pulses meeting the UWB definition of U. S. Federal Communications Commission (FCC, part 15) are successfully obtained in the experiment. PMID:19259191

Wang, Jian; Sun, Qizhen; Sun, Junqiang; Zhang, Weiwei

2009-03-01

243

UWB radar-based human target tracking  

Microsoft Academic Search

This paper presents a framework and algorithms for tracking the range of moving humans via a mono-static ultra-wideband (UWB) radar. The approach is based on a specular multi-path model for UWB radar scatters from walking humans. Empirical studies show that multipath time-of-arrival (TOA) can be modeled as a point process whose behavior is governed by a Gamma distribution. Based on

Sang Hyun Chang; Rangoli Sharan; Michael Wolf; Naoki Mitsumoto; Joel W. Burdick

2009-01-01

244

Analysis of UWB Interference to MPSK Narrowband Receivers  

Microsoft Academic Search

Abstract— This paper studies the in-band interference of time-hopping spread spectrum (TH-SS) ultra-wideband (UWB) signals to narrowband receivers. Based on the analysis of general power spectral density (PSD) of TH-SS UWB signal, the interference of UWB signal is partitioned into two parts: (1) additive white Gaussian noise interference, and (2) jamming tone interference. Following this framework, a novel analytical symbol

Dongsong Zeng; Amir I. Zaghloul; Annamalai Annamalai; E. F. Charles Laberge

2006-01-01

245

Effect of UWB Interference on WiMAX System  

Microsoft Academic Search

UWB (Ultra-wideband) radio is a fast emerging technology with uniquely attractive features inviting major advances in wireless communications, networking, radar, imaging, and positioning systems. UWB technology is advance technology for high speed data transfer for indoor as well as outdoor communication. Paper provides the coexistence of WiMax and UWB system that work in band 3.1GHz to 10.6 GHz. The brief

Rajesh Thakare; Kishor Kulat

2011-01-01

246

Effect of UWB interference on WiMAX system  

Microsoft Academic Search

UWB (Ultra-wideband) radio is a fast emerging technology with uniquely attractive features inviting major advances in wireless communications, networking, radar, imaging, and positioning systems. UWB technology is advance technology for high speed data transfer for indoor as well as outdoor communication. Paper provides the coexistence of WiMax and UWB system that work in band 3.1GHz to 10.6 GHz. The brief

Rajesh Thakare; Kishor Kulat

2011-01-01

247

Gigabit UWB video transmission system for wireless video area network  

Microsoft Academic Search

Ultra-wideband (UWB) technology has offered a large application bandwidth which has been reached up to 1 Gb\\/s recently. One of various UWB specifications, medium access control (MAC) and physical layer (PHY) technologies of WiMedia Alliance can also be used for high speed multimedia applications to establish a wireless video area network (WVAN). In this paper, we propose a Gb\\/s UWB

Sangjae Lee; Youngae Jeon; Sangsung Choi; Man Soo Han; Kyoungrok Cho

2011-01-01

248

Unification of ultra-wideband data acquisition and real-time monitoring in LHD steady-state experiments  

Microsoft Academic Search

To support the steady-state plasma experiments in LHD, new functions have been developed for the LABCOM data acquisition system. Using new WE7000 and PXI digitizers for continuous ultra-wideband data acquisition at 80MB\\/s, the system is now able to perform data acquisition, storage, and server-to-client transfer fully in real-time. To manage the high amount of data for long-pulse experiments, the system

M. Ohsuna; H. Nakanishi; S. Imazu; M. Kojima; M. Nonomura; M. Emoto; Y. Nagayama; H. Okumura

2006-01-01

249

A general model and SINR analysis of low duty-cycle UWB access through multipath with narrowband interference and rake reception  

Microsoft Academic Search

Interference from coexisting narrowband services is a critical factor affecting performance of ultra-wideband (UWB) radio communications. There is clearly a need to quantify interference and compare UWB systems on that basis. In this paper, we develop a general Rake reception model along with a unifying transmission framework for low duty-cycle UWB multiple access encompassing existing and novel spreading codes, including

Liuqing Yang; Georgios B. Giannakis

2005-01-01

250

The low dispersion coaxial cavity as an ultra wideband antenna  

Microsoft Academic Search

A coaxial cavity antenna, patent pending, has been developed by Raytheon. It exhibits low dispersion over a wide field-of-view (FOV) and multiple octaves or ultra wideband. This antenna has essentially a flat phase and amplitude response over a ±60 degree FOV. The design is scaleable over multiple frequency ranges and antennas have been built covering frequency ranges from 200 MHz

Tim Holzheimer; Garland Texas

2002-01-01

251

Frequency domain detectors for ultra-wideband indoor communications  

Microsoft Academic Search

In this paper we propose an innovative communication scheme for ultra-wideband systems which are based on impulse radio. The proposed system relies on both the introduction of the cyclic prefix at the transmitter and the use of a frequency domain detector at the receiver. Two different detection strategies based either on the zero forcing (ZF) or the minimum mean square

Simone Morosi; Tiziano Bianchi

2006-01-01

252

Design and analysis of UWB band pass filter with ring filter  

Microsoft Academic Search

To realize an ultra wideband (UWB) bandpass filter (BPF) in wireless communications, a device is developed using a new ring filter. The ring filter is compact, with low insertion loss, sharp rejection and a constant group delay within the UWB pass band. The ring filter is made to control the attenuation pole frequency by adjusting both the ring and the

Hitoshi Ishida; Kiyomichi Araki

2004-01-01

253

Design of a multiband OFDM system for realistic UWB channel environments  

Microsoft Academic Search

In February 2002, the Federal Communications Commission allocated 7500 MHz of spectrum for unlicensed use of commercial ultra-wideband (UWB) communication devices. This spectral allocation has initiated an extremely productive activity for industry and academia. Wireless communications experts now consider UWB as available spectrum to be utilized with a variety of techniques, and not specifically related to the generation and detection

Anuj Batra; Jaiganesh Balakrishnan; G. Roberto Aiello; Jeffrey R. Foerster; Anand Dabak

2004-01-01

254

Signal Processing in Multisite UWB Radar Devices for Searching Survivors in Rubble  

Microsoft Academic Search

The use of ultra wideband multisite radar devices (UWB MSRDs) with two antennas separated by about 1...1.5 m for searching survivors in rubble is very prospective. Optimised signal processing in such UWB MSRD is considered, which has to solve two principal problems: 1) detection of very weak signals reflected from a moving human chest due to breathing against strong clutter

Victor Chernyak

2006-01-01

255

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’s 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.

Thiel, Florian; Kosch, Olaf; Seifert, Frank

2010-01-01

256

A 22–29GHz UWB Pulse-Radar Receiver Front-End in 0.18- CMOS  

Microsoft Academic Search

The design of a CMOS 22-29-GHz pulse-radar receiver (RX) front-end for ultra-wideband automotive radar sensors is presented. The chip includes a low-noise amplifier, in-phase\\/quadrature mixers, a quadrature voltage-controlled oscillator (QVCO), pulse formers, and baseband variable-gain amplifiers. Fabricated in a 0.18-mum CMOS process, the RX front-end chip occupies a die area of 3 mm2. On-wafer measurements show a conversion gain of

Vipul Jain; Sriramkumar Sundararaman; Payam Heydari

2009-01-01

257

A 19pJ\\/pulse UWB transmitter with dual capacitively-coupled digital power amplifiers  

Microsoft Academic Search

A fully integrated pulsed-UWB transmitter that communicates in the 3-to-5 GHz 802.15.4a bands is presented. Enabled by relaxed frequency tolerances of non-coherent communication, the all-digital architecture generates FCC-compliant UWB pulse-bursts using discrete four-level pulse shaping. BPSK-modulation is achieved without the use of a balun through dual capacitively-coupled digital power amplifiers. The transmitter consumes zero static bias power and achieves an

Patrick P. Mercier; Denis C. Daly; Anantha P. Chandrakasan

2008-01-01

258

Small Patch Antennas for UWB Wireless Body Area Network  

NASA Astrophysics Data System (ADS)

This paper presents the transient characteristics of an aperture-stacked patch antenna (ASPA) and its miniaturized version. These antennas were designed for ultra-wideband (UWB) body area network (BAN) applications, to operate within the 3 to 6 GHz frequency band. The APSA with large ground plane size has a planar dimensions 70 × 70 mm2, the smaller version has dimensions 32 × 26 mm2. The latest yields 85% reduction of the antenna surface. Time- and frequency-domain characteristics of these antennas were calculated in a transmission mode (Tx) and also in a complete, two-antenna (Tx-Rx) system. We have used 3 different waveforms to drive the antenna: gaussian pulse (duration-250 ps), monocycle pulse (duration-300 ps) and defined wavelet (duration-650 ps). The received pulses have very similar shapes (fidelity >90%), but they differ in the voltage amplitudes. Results show that the highest received voltage (best transmission efficiency) is achieved for the pulse with the closest spectrum to the antenna's transfer function characteristic. In order to disclose the effects of the human body proximity, two body models were built and full-wave FDTD method was employed to carry out the simulations. Significant changes of the UWB antenna performance when close to the body were identified. The most important effects are the seriously decreased radiation efficiency (16 to 34%) and different (from that in a free space) shape of the antenna transfer function. The first one can have the impact on low power implementations of UWB wearable radios; the second one discloses possible influence on the UWB systems design (especially for template receivers). The impact of the human body on antenna characteristics was identified to be a key factor in UWB body-worn antenna design.

Klemm, M.; Tröster, G.

259

Focus of attention for millimeter and ultra wideband synthetic aperture radar imagery  

NASA Astrophysics Data System (ADS)

The major goal of this research is to develop efficient detectors for Synthetic Aperture Radar (SAR) images, exploiting the reflectivity characteristics of targets in different radar types. Target detection is a signal processing problem whereby one attempts to detect a stationary target embedded in background clutter while minimizing the false alarm probability. In radar signal processing, the better resolution provided by the Millimeter Wave (MMW) SAR enhances the detectability of small targets. As radar technology evolves, the newly developed Ultra Wideband (UWB) SAR provides better penetration capabilities to locate concealed targets in foliage. In this thesis we demonstrate that local intensity kernel tests can be formulated based on the generalized likelihood ratio test (GLRT), while preserving constant false alarm rate (CFAR) characteristics. Both the widely used two-parameter CFAR and the g -CFAR can be viewed as special cases of the local intensity tests with different intensity kernels. It is demonstrated that the first-order Gamma kernel is a good approximation for the principal eigenvector of the projected radial intensity of targets, which provides the optimal matching intensity kernel. This also explains the better performance of the g -CFAR detector over the two parameter CFAR detector. We also developed different CFAR subspace detectors for UWB images, utilizing a Laguerre function subspace. The driven response produced by natural clutter degrades the performance of these subspace detectors. In addition to the driven response, the distinguishing feature of metallic targets in UWB is the resonance response. Therefore, we further propose a two-stage detection scheme: g -CFAR detector followed by the quadratic Laguerre discriminator (QLD). We evaluate every detector and discriminator using ROC curves in a large area (about 2 km2) of imagery. The combined g -CFAR and quadratic Laguerre discriminator improve the simple Laguerre subspace detector more than one hundred fold for a perfect detection rate (Pd = 1).

Yen, Li-Kang

260

Ultra-wideband Active Receiving Array Antenna with Dual Polarization  

Microsoft Academic Search

\\u000a This chapter presents results of the investigations directed to creation of large ultra-wideband active receiving array antennas\\u000a with dual polarization. The array element is made on the basis of two crossed electric dipoles. Each arm of the dipoles is\\u000a loaded to the single-stage FET amplifier. Four such elements form a 2 × 2 module being a component of a multielement

V. I. Koshelev; E. V. Balzovsky; Yu. I. Buyanov

2010-01-01

261

Ultra-wideband spectral analysis using S2 technology  

Microsoft Academic Search

This paper outlines the efforts to develop an ultra-wideband spectrum analyzer that takes advantage of the broad spectral response and fine spectral resolution (?25kHz) of spatial-spectral (S2) materials. The S2 material can process the full spectrum of broadband microwave transmissions, with adjustable time apertures (down to 100?s) and fast update rates (up to 1kHz). A cryogenically cooled Tm:YAG crystal that

R. Krishna Mohan; T. Chang; M. Tian; S. Bekker; A. Olson; C. Ostrander; A. Khallaayoun; C. Dollinger; W. R. Babbitt; Z. Cole; R. R. Reibel; K. D. Merkel; Y. Sun; R. Cone; F. Schlottau; K. H. Wagner

2007-01-01

262

Low power 8GHz ultra-wideband active balun  

Microsoft Academic Search

A new low-power CMOS active balun is designed for ultra-wideband applications, using a pair of common-source NMOS and common-gate PMOS transistors. This balun gives an impedance transformation ratio of 1:2. Without compensation feedback, the circuit provides a differential signal within 2dB and 3deg of gain and phase imbalance, respectively, up to 8-GHz. Total power consumption is only 1.44 mW at

Ta-Tao Hsu; Chien-Nan Kuo

2006-01-01

263

Wearable Vivaldi UWB planar antenna for in-body communication  

Microsoft Academic Search

This paper proposes a planar Vivaldi antenna design in ultra wideband (UWB) for medical wireless capsule endoscope applications, in which it acts as the on-body receiver antenna. The proposed antenna connects two opposite Vivaldi variants on one side of the substrate and is fed by a radial stub microstrip on the other side. An additional metallic reflector, added at the

Qiong Wang; Ronny Hahnel; Hui Zhang; Dirk Plettemeier

2011-01-01

264

Narrowband interference suppression in multi-band UWB communication systems  

Microsoft Academic Search

In this paper we present a new method for mitigating narrowband interference in multiband OFDM (MB-OFDM) ultra wideband (UWB) systems. The method employs spectral shaping of the transmitted signal using binary signature sequences with minimum total squared correlation (TSC) to avoid the narrowband interfering signal. We illustrate the proposed method with plots that show the spectrum of the transmitted signal

Prasad Yaddanapudi; Dimitrie C. Popescu

2006-01-01

265

UWB Two-Cluster AOA Tracking Prototype System Design.  

National Technical Information Service (NTIS)

This presentation discusses 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 expl...

P. H. Ngo D. Arndt C. Phan J. Gross M. Rafford

2006-01-01

266

UWB Tracking System Design for Lunar/Mars Exploration.  

National Technical Information Service (NTIS)

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...

C. Phan D. Arndt J. Gross J. Ni P. Ngo

2006-01-01

267

Assessment of Electromagnetic Requirements for UWB Through-Wall Radar  

Microsoft Academic Search

This paper investigates electromagnetic requirements for ultra-wideband (UWB) through-wall radar. It includes the evaluation of propagation loss, dynamic range and radar resolution for typical through-wall scenarios. The evaluation results in analysis and comparison of different transmission schemes.

X. Zhuge; T. G. Savelyev; A. G. Yarovoy

2007-01-01

268

APPLICATION OF TRM IN THE UWB THROUGH WALL RADAR  

Microsoft Academic Search

Time Reversal Mirror (TRM) technique, in the virtue of its high resolution in the heterogeneous media, has been widely applied in the area of acoustics and electromagnetics. In this paper, the technique is developed to imaging targets in the contest of ultra-wideband (UWB) through wall radar (TWR) through numerical simulation. We firstly consider the technique to image targets behind a

Wenjun Zheng; Zhiqin Zhao; Zai-Ping Nie

2008-01-01

269

A CMOS impulse radio ultra-wideband transceiver for 1Mb\\/s data communications and ±2.5cm range findings  

Microsoft Academic Search

A CMOS impulse radio ultra-wideband (IR-UWB) transceiver is developed in 0.18?m CMOS. It can be used for a 1Mb\\/s data transceiver, as well as a range finder within an error of ±2.5cm. Chip layout area of a transmitter and a receiver is 0.035mm2 and 0.38mm2, respectively. Power dissipation for 1Mb\\/s data communications is 0.7mW for the transmitter and 4.0mW for

Takahide Terada; Shingo Yoshizumi; Yukitoshi Sanada; Tadahiro Kuroda

2005-01-01

270

A low complexity MMSE-RAKE receiver in a realistic UWB channel and in the presence of NBI  

Microsoft Academic Search

Ultra-wideband (UWB) radio systems have attracted a lot of attention during the last few years. These systems are very low transmission power and spread over a bandwidth of several gigahertz. The very low transmission power and the large bandwidth used, enable a UWB system to co-exist with other narrow band systems. Nevertheless, these narrow band systems may cause interference, which

N. Boubaker; K. B. Letaief

2003-01-01

271

High power added efficiency power amplifier with harmonic controlled by UWB filter with notched band at 6.42 GHz  

Microsoft Academic Search

A high power added efficiency (PAE) GaN inverse Class F PA (power amplifier) at 2.14 GHz with UWB (Ultra Wideband) bandpass notched filter is designed, fabricated and tested. For this amplifier, second harmonic and fourth harmonic are rejected by the bias circuit, while third harmonic is controlled by a UWB bandpass notched filter and fifth harmonic is tuned by a

Zhebin Wang; Shengjie Gao; Fathi Nasri; Chan-Wang Park

2011-01-01

272

Optical distribution of UWB: Low complexity pulse generation supporting OOK and PSK  

Microsoft Academic Search

Optical transport of UWB signals extends the reach of these power-limited signals. We propose and experimentally demonstrate a simple, low-cost method to generate UWB pulses in optics. Unlike other methods, we use the minimal hardware configuration (source\\/modulator\\/photodetector) without requiring RF pulse shaping. A novel combination of data and a sinusoidal signal modulates the intensity of a continuous wave laser to

Mehrdad Mirshafiei; Mansour Dastmalchi; Mohammad Abtahi; Sophie LaRochelle; Leslie A. Rusch

2010-01-01

273

The effect of NBI on UWB time-hopping systems  

Microsoft Academic Search

This letter presents an analysis of the effect of narrowband interference (NBI) on ultra-wideband (UWB) time-hopping (TH) systems in the presence of multipath fading using both analytical derivations and simulations. Our analysis demonstrates that NBI may be an issue in some instances. In addition we suggest three NBI suppression schemes for combating NBI in UWB TH systems. Single-link performance of

Xiaoli Chu; Ross D. Murch

2004-01-01

274

UWB ranging with antenna proximity to the human head  

Microsoft Academic Search

Time-of-arrival (ToA) estimation used with ultra-wideband (UWB) technology has become the most popular technique for accurate indoor localization. Much work has been done on UWB ToA estimation in general. However, the effect of the radiation patterns of antennas used in localization applications have not been considered. This paper investigates the effect of user terminal (UT) antenna pattern on the detection

Marzieh Dashti; Afroza Khatun; Tommi Laitinen; A. A. H. Azremi; K. Haneda; M. Ghoraishi; J.-i. Takada

2010-01-01

275

Comparative analysis of Bluetooth 3.0 with UWB and Certified Wireless-USB protocols  

Microsoft Academic Search

This paper presents the results of the comparative analysis of two different protocols that use or could potentially use the Ultra Wideband (UWB) radio technology - Certified Wireless-USB and Bluetooth 3.0 with UWB. Bluetooth 3.0 with UWB is found to have a number of advantages over Certified Wireless-USB. These include lesser overheads, higher throughputs, higher power efficiency, better device association

Abhishek Bit; Martin Orehek; Waqar Zia

2010-01-01

276

Analytical Description of Signal Characteristics and Interference For Time Hopped UWB System  

Microsoft Academic Search

In this paper, signal and interference characterisation of Time Hopped Ultra Wideband (TH-UWB) systems is considered. Some special problems often neglected in theoretical studies are discussed, such as the bound between neareld and fareld and the distortions of wave shape. The transmitted TH-UWB signal is shown to be a cyclostationary process, as is the interference caused by TH-UWB signal on

Jian Zhang; Rodney A. Kennedy; Thushara D. Abhayapala

2002-01-01

277

Performance analysis of 3G systems in presence of UWB interference  

Microsoft Academic Search

In this paper, the impact of the interference from multiple ultra wideband (UWB) transmitters to a 3rd-generation (3G) terminal is evaluated under UWB emission power limit regulations of federal communications commission (FCC), european telecommunications standards institute (ETSI) and Japan respectively. A three-dimensional interference model is presented where a discrete spatial distribution of UWB transmitters is considered. It is assumed that

Xue-bin SUN; Ming-liang GAO; Zheng ZHOU; Cheng-lin ZHAO; Wei LIU

2011-01-01

278

Real-Time Noncoherent UWB Positioning Radar With Millimeter Range Accuracy: Theory and Experiment  

Microsoft Academic Search

In this paper, we propose a novel architecture for ultra-wideband (UWB) positioning systems, which combines the architectures of carrier-based UWB systems and traditional energy detection-based UWB systems. By implementing the novel architecture, we have successfully developed a standalone noncoherent system for positioning both static and dynamic targets in an indoor environment with approximately 2 and 5 mm of 3-D accuracy,

Cemin Zhang; Michael J. Kuhn; Brandon C. Merkl; Aly E. Fathy; Mohamed R. Mahfouz

2010-01-01

279

People Tracking with UWB Radar Using a Multiple-Hypothesis Tracking of Clusters (MHTC) Method  

Microsoft Academic Search

This paper presents a method to track multiple moving humans using Ultra-Wideband (UWB) radar. UWB radar can complement other\\u000a human tracking technologies, as it works well in poor visibility conditions. Our tracking approach is based on a point process\\u000a interpretation of the multi-path UWB radar scattering model for moving humans. Based on this model, we present a multiple\\u000a hypothesis tracking

SangHyun Chang; Rangoli Sharan; Michael T. Wolf; Naoki Mitsumoto; Joel W. Burdick

2010-01-01

280

Blind UWB timing with a dirty template  

Microsoft Academic Search

Ultra-wideband (UWB) radio is gaining increasing attention thanks to its attractive features that include low-power low-complexity baseband operation and ample multipath diversity. Realization of its potential, however, faces the challenge of low-complexity high-performance timing acquisition. In this paper, we develop a blind timing acquisition algorithm for frame-level synchronization. Relying on simple integrate-and-dump operations over one symbol duration, our algorithm exploits

Liuqing Yang; Georgios B. Giannakis

2004-01-01

281

Method for the Three-Dimensional Imaging of a Moving Target Using an Ultra-Wideband Radar with a Small Number of Antennas  

NASA Astrophysics Data System (ADS)

Ultra wideband (UWB) radar is considered a promising technology to complement existing camera-based surveillance systems because, unlike cameras, it provides excellent range resolution. Many of the UWB radar imaging algorithms are based on large-scale antenna arrays that are not necessarily practical because of their complexity and high cost. To resolve this issue, we previously developed a two-dimensional radar imaging algorithm that estimates unknown target shapes and motion using only three antennas. In this paper, we extend this method to obtain three-dimensional images by estimating three-dimensional motions from the outputs of five antennas. Numerical simulations confirm that the proposed method can estimate accurately the target shape under various conditions.

Sakamoto, Takuya; Matsuki, Yuji; Sato, Toru

282

Accurate Image Expansion Method Using Range Points Based Ellipse Fitting for UWB Imaging Radar  

NASA Astrophysics Data System (ADS)

Ultra-wideband (UWB) pulse radars have a definite advantage in high-range resolution imaging, and are suitable for short-range measurements, particularly at disaster sites or security scenes where optical sensors are rarely suitable because of dust or strong backlighting. Although we have already proposed an accurate imaging algorithm called Range Points Migration (RPM), its reconstructible area is too small to identify the shape of an object if it is far from the radar and the size of the aperture is inadequate. To resolve this problem, this paper proposes a novel image expansion method based on ellipse extrapolation; it enhances extrapolation accuracy by deriving direct estimates of the observed range points distributed in the data space. Numerical validation shows that the proposed method accurately extrapolates part of the target boundary, even if an extremely small region of the target boundary is obtained by RPM.

Abe, Yoriaki; Kidera, Shouhei; Kirimoto, Tetsuo

283

Joint Timing and Channel Estimation for Ultra-Wideband Signals  

NASA Astrophysics Data System (ADS)

This paper is concerned with timing synchronization of high rates UWB signals operating in a dense multipath environment, where access must tackle inter-frame interference (IFI), inter-symbol interference (ISI) and even multi-user interference (MUI). A training-based joint timing and channel estimation scheme is proposed, which is resilient to IFI, ISI, MUI and pulse distortion. A low-complexity detection scheme similar to transmit-reference (TR) scheme comes out as a by-product. For saving the training symbols, we further develop an extended decision-directed (DD) scheme. A lower bound on the probability of correct detection is derived which agrees well with the simulated result for moderate to high SNR values. The results show that the proposed algorithm achieves a significant performance gain in terms of mean square error and bit error rate in comparison to the “timing with dirty templates” (TDT) algorithms.

Liu, Tao; Zhu, Shihua

284

Generation and transmission of FCC-Compliant impulse radio Ultra Wideband signals over 100-m GI-POF  

Microsoft Academic Search

We demonstrate a novel technique for generation and transmission of IR-UWB signals over 100 metres 50-mum core GI-POF. IR-UWB pulses are made by linearly combining two 3rd-order derivatives of Gaussian pulses with different pulse-shaping factors.

S. T. Abraha; H. Yang; E. Tangdiongga; A. M. J. Koonen

2009-01-01

285

Novel generation and transmission of FCC-compliant impulse radio ultra wideband signals over 100-m GI-POF  

Microsoft Academic Search

We demonstrate a novel technique for generation and transmission of IR-UWB signals over 100-m 50-mum core GI-POF. IR-UWB pulses are made by linearly combining two first-order derivatives of Gaussian pulses with different pulse-shaping factors.

S. T. Abraha; H. Yang; E. Tangdiongga; A. M. J. Koonen

2009-01-01

286

Applications of time-frequency and time-scale transforms to ultra-wideband radar transient signal detection  

NASA Astrophysics Data System (ADS)

In this paper we use a non-stationary approach and analyze ultra-wideband (UWB) radar data using time-frequency and time-scale transformations. The time-frequency transformations considered are the Short-Time Fourier Transform (STFT), the Wigner-Ville Distribution (WD), the Instantaneous Power Spectrum (IPS), and the ZAM transform. Two discrete implementations of the Wavelet Transform (DWT) are also investigated: the decimated A- trous algorithm proposed by Holschneider et al, which uses non-orthogonal wavelets; and the Mallat algorithm, which employs orthogonal wavelets. The transients under study are UWB radar returns from a boat (with and without corner reflector) in the presence of sea clutter, multipath, and radio frequency interferences (RFI). Results show that all time-frequency and time-scale transforms clearly detect the transient radar returns corresponding to the boat with a corner reflector. However, as the radar cross section of the target decreases (boat without a corner reflector), results change drastically as the RFI component dominates the signal. Simulations show that the Instantaneous Power Spectrum may be better adapted for localizing the transient among the time-frequency techniques studied. The decimated A-trous algorithm has the best time resolution of the techniques studied as the return appears better localized in the scalogram.

Fargues, Monique P.; Brooks, William A.

1993-11-01

287

Influence of the technology on the destruction effects of semiconductors by impact of EMP and UWB pulses  

Microsoft Academic Search

In this paper the influence of TTL- and CMOS-technology on the destruction effects of semiconductors by impact of EMP and UWB pulses is determined. Different logic devices like NANDs and inverters were exposed to high amplitude transient pulses.

Michael Camp; Heyno Garbe; Daniel Nitsch

2002-01-01

288

Research of all-optical ultra-wideband triplet signal source based on a single semiconductor optical amplifier  

NASA Astrophysics Data System (ADS)

A novel scheme for all-optical ultra-wideband triplet signal pulse generation based on the cross-gain modulation (XGM) in a single semiconductor optical amplifier (SOA) is demonstrated. In this scheme, only one optical source and one SOA are needed, so the configuration is simple. Due to only one wavelength is included in the generated triplet pulse, no time difference between output signal light and probe light is introduced during the transmission process. By using the software of Optisystem 7.0, the impacts of the input signal width, the optical power and the wavelength of the optical source on the generated triplet pulse are numerically simulated and studied. The results show that the proposed scheme has better triplet signal pulse when the input signal pulse width is larger, and it is insensitive to the wavelength change within a certain range.

Xue, Fei; Li, Pei-li; Zheng, Jia-jin; Wang, Li-li; Liang, Wei-kang

2013-07-01

289

Indoor coverage improvement of MB-OFDM UWB signals with radio over POF system  

Microsoft Academic Search

A radio over fiber system using the fluorinated based polymer multimode fibers (PMMF) is presented in this paper for the enhancement of the indoor coverage of the multiband orthogonal frequency division multiplexing ultra-wideband standard (MB-OFDM UWB) inside a building. A preliminary part related the cost analysis owing to glass and polymer multimode fiber deployment inside a fiber network is reported.

Christophe Lethien; Christophe Loyez; Jean-Pierre Vilcot; Laurent Clavier; Michael Bocquet; Paul Alain Rolland

2009-01-01

290

A dual polarized low profile UWB antenna for building material analysis  

Microsoft Academic Search

A compact directive dual linear polarized ultra-wideband (UWB) antenna designed for building material analysis (BMA) devices in the frequency range from 2.6 GHz to 4 GHz is proposed. The antenna has a total size of 61 mm 2 and a height of 18 mm. The radiation patterns for both polarization directions are symmetrical over a wide bandwidth and radiate perpendicular

Dorothea S. Sturtz; Heiko Braun; Martin Pohlmann; Joerg Schoebel; Juergen Hasch

2011-01-01

291

A Novel Compact Tree-Design Antenna (NCTA) with High Gain Enhancement for UWB Application  

Microsoft Academic Search

In this paper, a novel compact tree-design antenna (NCTA) for ultra-wideband (UWB) application with high gain and impedance matching improvement is analyzed and presented. The novel antenna is composed of a single centered circle connected to seven outer circles via three bridges with partial ground plane execution. Instead of functioning as filters, these seven circles play a major role in

M. Jusoh; M. F. Jamlos; M. R. Kamarudin; F. Malek; M. H. Mat; M. A. Jamlos

2011-01-01

292

A Heterogeneous High Speed Wireless Body Sensor Network Based on SC-UWB and ZIGBEE  

Microsoft Academic Search

Some new medical applications, such as wireless endoscopy system for the diagnoses of whole human digestive tract and real-time endoscopic image monitoring, demand high speed transmission in wireless body sensor network (WBSN). This paper proposes a heterogeneous high speed wireless body sensor network based on ZIGBEE and single carrier ultra wideband (SC-UWB). Our system can choose high speed mode or

Xinlei Chen; Xiyu Lu; Zhongjin Liu; Shaoxia Fang; Depeng Jin; Lieguang Zeng

2011-01-01

293

Impact of different correlation receiving techniques on the imaging performance of UWB random noise radar  

Microsoft Academic Search

Cross correlation receiver is one of the most important parts in a random noise radar system. In this paper, the impact of different correlation receiving techniques on the imaging performance of ultra wideband (UWB) random noise radar is studied. Three types of correlation receivers, namely, the ideal analog correlation receiver, the digital-analog correlation receiver, and the fully digital correlation receiver,

Xiaojian Xu; Ram M. Narayanan

2003-01-01

294

Ultra-wideband millimetre-wave self-oscillating mixer  

NASA Astrophysics Data System (ADS)

The performance of an ultra-wideband millimeter-wave GaAs self-oscillating harmonic mixer (SOHM) is presented. Conversion gain, minimum detectable signal (MDS) and 'self-pumping' power level have been measured for the 30 GHz frequency coverage centred at approximately 85 GHz. Sensitivity better than - 71 dBm (without automatic frequency control) using 33 MHz bandwidth, and conversion gain as high as 12 dB have been achieved. For input mm-wave dynamic range of 55 dB (from -20 dBm to -75 dBm), a useful down conversion gain-compression has led to a corresponding variation of only 0.5 mV in the peak-to-peak 70 MHz IF signal (from 0.94 kmV to 0.44 mV).

Lazarus, M. J.; Pantoja, F. R.

1983-08-01

295

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

296

Ultra-wideband radar methods and techniques of medical sensing and imaging  

NASA Astrophysics Data System (ADS)

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, Christine N.; Chang, John T.; Romero, Carlos E.; Watson, Joseph; Pearce, Fred J.; Levin, Nathan

2005-11-01

297

Secret Key Extraction in Ultra Wideband Channels for Unsynchronized Radios  

Microsoft Academic Search

Secure communicationsin UWB based on cryptographic keys generated from channel measurements without a trusted third party have been developed. The fine time res- olution of UWB allows high levels of mutual information to be obtained by a given A and B through independent char- acterizations of their shared communication channel. This mutual informationdetermines the maximum secret key rate available to

Masoud Ghoreishi Madiseh; Michael L. Mcguire; Stephen W. Neville; Ali Asghar Beheshti Shirazi

2008-01-01

298

A high-resolution imaging algorithm based on scattered waveform estimation for UWB pulse radar systems  

Microsoft Academic Search

Target estimation methods with UWB pulse signals are promising as imaging techniques for household or rescue robots. We have already proposed an efficient al- gorithm for shape estimation, SEABED(Shape Estimation Algorithm based on BST and Extraction of Directly scat- tered waves), which is based on a reversible transform BST (Boundary Scattering Transform) between the time delay and the target shape.

Shouhei KIDERA; Takuya SAKAMOTO; Toru SATO

2005-01-01

299

An Accurate Imaging Algorithm with Scattered Waveform Estimation for UWB Pulse Radars  

Microsoft Academic Search

SUMMARY UWB pulse radars that offer target shape estimation are promising as imaging techniques for household or rescue robots. We have already proposed an efficient algorithm for a shape estimation method SEABED which is a fast algorithm based on a reversible transform. SEABED extracts quasi wavefronts from received signals with the filter that matches the transmitted waveform. However, the scattered

Shouhei Kidera; Takuya Sakamoto; Satoshi Sugino; Toru Sato

2006-01-01

300

A robust and fast imaging algorithm without derivative operations for UWB pulse radars  

Microsoft Academic Search

Target shape estimation with UWB pulse radars is promising as an imaging technique for household robots. We have already proposed a fast imaging algorithm, SEABED based on a reversible transform BST (Boundary Scattering Transform) between the received signals and the target shape. However the target image obtained by SEABED deteriorates in a noisy environment because it utilizes a derivative of

Shouhei Kidera; Takuya Sakamoto; Toru Sato

2006-01-01

301

A New Method of Complex Target Shape Reconstruction for UWB Through-Wall Radar  

Microsoft Academic Search

Through-wall imaging techniques with ultra-wideband (UWB) radar are promising candidates for non-destructive detection, especially in disaster areas like calamity rescue scenarios, counter-terrorism and so on. These applications always require high-resolution target imaging to identify the object shape. Based on this requirement, a complex target shape reconstruction method for UWB radar is proposed to realize the shape estimation of the target

Jutao Li; Shiyou Wu; Chao Chen; Guangyou Fang

2011-01-01

302

Performance evaluation of DC-OFDM system in China UWB standard  

Microsoft Academic Search

In this paper, we introduce the recently published China Ultra Wideband (UWB) standard defined in China Wireless Personal Area Networks (C-WPAN) working group for its Dual Carrier OFDM (DC-OFDM) system. The pros and cons are discussed for this DC-OFDM system with four band hopping. The requirement for the length of channel estimation symbols in C-WPAN UWB is validated by applying

Zhiwei Lin; Xiaoming Peng; Francois Chin; Pei Liu

2011-01-01

303

Time-Interleaved Digital-to-Analog Converters for UWB Signal Generation  

Microsoft Academic Search

In this paper, a differentially encoded time-interleaved digital-to-analog converter (TIDAC) structure for ultra-wideband (UWB) signal generation is presented. We show that the output spectrum of the TIDAC is identical to the output of a DAC running at a higher sampling rate. To support the mathematical derivations, the UWB signal generator has been implemented on FPGA hardware and measurements have been

Christoph Krall; Christian Vogel; Klaus. Witrisal

2007-01-01

304

Cross-layer optimization for routing data traffic in UWB-based sensor networks  

Microsoft Academic Search

Ultra-wideband (UWB) has great potential for wireless communications in emerging applications such as sensor networks. This paper considers UWB-based sensor networks and studies the following problem: given a set of source sensor nodes in the network each generating a certain data rate, is it possible to relay all these rates successfully to the base-station? We follow a cross-layer optimization approach,

Yi Shi; Yiwei Thomas Hou; Hanif D. Sherali; Scott F. Midkiff

2005-01-01

305

Performance Degradation Due to OFDM-UWB Radio Signal Transmission Along Dispersive Single-Mode Fiber  

Microsoft Academic Search

The performance degradation of orthogonal frequency-division multiplexing (OFDM) ultra-wideband (UWB) radio signals caused by transmission along dispersive single-mode fiber is assessed theoretically and by numerical simulation. It is shown that the performance degradation of OFDM-UWB signals caused by fiber dispersion is due to the power fading induced on the subcarrier showing stronger fading. Results show that the power fading description

Tiago Alves; Adolfo Cartaxo

2009-01-01

306

A Compact Microstrip Square-Ring Slot Antenna for UWB Applications  

Microsoft Academic Search

A microstrip square-ring slot antenna (MSRSA) for UWB (ultra wideband) antenna applications is proposed and improved by compaction. This structure is fed by a single microstrip line with a fork like-tuning stub. By splitting the square-ring slot antenna (SRSA) and optimization of the feeding network, the required impedance bandwidth is achieved over the UWB frequency range (3.1 to 10.6 GHz).

S. Sadat; M. Fardis; F. Geran; G. Dadashzadeh; N. Hojjat; M. Roshandel

2006-01-01

307

Design and characterization of a UWB slot antenna optimized for radiation in human tissue  

Microsoft Academic Search

Ultra-wideband (UWB) short-range communication systems are valuable in medical technology, particularly for implanted devices, due to their low power consumption, low cost, and high-data rates. Hence, antennas suitable for implantation in the human body are desired. The focus of this publication is on the design of a small planar UWB slot antenna, optimized for operation in human tissue. The antenna

Mario Leib; Michael Frei; Dietmar Sailer; Wolfgang Menzel

2009-01-01

308

Feature based indoor mapping using a bat-type UWB radar  

Microsoft Academic Search

A system for building a feature-based map of an unknown indoor environment is proposed. We consider emergency scenarios where smoke and dust block the vision so that camera-based systems and laser range finders are not operable. In this kind of situation, ultra-wideband (UWB) radar is a good alternative. We use a bat-type UWB radar system composed of one transmitter and

T. Deissler; J. Thielecke

2009-01-01

309

UWB Radar: Mechanical Scanning and Signal Processing for Through-the-Wall Imaging  

NASA Astrophysics Data System (ADS)

This chapter presents a state of the art of the UWB (ultra-wideband) radar for through-the-wall imaging, followed by a description of different methods to scan a scene situated through a wall using a UWB system. Principal attention of this chapter focuses on a mechanical scanning radar system and associated image processing to detect a human body through a wall and also the environment of a target.

Liebe, C.; Gaugue, A.; Khamlichi, J.; Menard, M.; Ogier, J.-M.

310

Space time MSINR-SRAKE receiver with finger assignment strategies in UWB multipath channels  

Microsoft Academic Search

This paper proposes a space time selective RAKE (SRAKE) receiver by maximizing signal to interference-plus-noise ratio (MSINR) for ultra wideband (UWB) communications in the presence of narrowband interference (NBI) and multiple access interference. For effectively extracting the UWB signal of interest with low complexity, two finger assignment strategies (FASs), the energy-based FAS and the constrained energy-based FAS, are considered by

Tsung-Hui Chang; Yu-Jung Chang; Chun-Hsien Peng; Yu-Hang Lin; Chong-Yung Chi

2005-01-01

311

An Energy-Efficient All-Digital UWB Transmitter Employing Dual Capacitively-Coupled Pulse-Shaping Drivers  

Microsoft Academic Search

This paper presents an all-digital, non-coherent, pulsed-UWB transmitter. By exploiting relaxed center frequency tolerances in non-coherent wideband communication, the transmitter synthesizes UWB pulses from an energy-efficient, single-ended digital ring oscillator. Dual capacitively coupled digital power amplifiers (PAs) are used in tandem to attenuate low frequency content typically associated with single-ended digital circuits driving single-ended antennas. Furthermore, four level digital pulse

Patrick P. Mercier; Denis C. Daly; Anantha P. Chandrakasan

2009-01-01

312

A CMOS variable width short-pulse generator circuit for UWB RADAR applications  

Microsoft Academic Search

This paper describes a variable width short pulse generator circuit for UWB radar applications, designed in a 0.18mum CMOS technology. This circuit is capable of generating pulses with a duration from 0.7 ns to 3.5 ns and an amplitude of 0.7 V with a 50 Omega load. The power supply voltage can be as low as 1.5 V and uses

Nuno F. Paulino; João Goes; Adolfo Steiger-garção

2008-01-01

313

Network service provisioning in UWB open mobile access networks  

Microsoft Academic Search

An innovative architecture to access information transport resources under short-term market conditions is presented. Ultra-wideband (UWB) technology in the centralized wireless access domain is believed to minimize the intrinsic performance limitations of the radio link and to provide flexible access in a very wide range of data rates of over 100 Mb\\/s, even in a strong multipath environment. The decoupling

D. Di Sorte; M. Femminella; G. Reali; S. Zeisberg

2002-01-01

314

Development of UWB microwave array radar for concealed weapon detection  

Microsoft Academic Search

This paper describes two approaches to short-range microwave imaging by means of ultra-wideband (UWB) technology. The first approach deals with synthetic aperture radar (SAR) that employs a transmit-receive antenna pair on mechanical scanner. The second one represents a multiple input multiple output (MIMO) antenna array that scans electronically in the horizontal plane and mechanically, installed on the scanner, in the

Timofey Savelyev; Xiaodong Zhuge; Bill Yang; Alexander Yarovoy; Leo Ligthart; Michail Drozdov; Boris Levitas

2010-01-01

315

A study of UWB Interference at 3G Systems  

Microsoft Academic Search

Abstract—In this paper, a Direct Spread-Ultra Wideband (DS-UWB) system model is described in time domain and frequency domain and Power Spectral Density (PSD) is studied in detail. In the interference power calculation, the victim receivers are Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access 2000 (CDMA2000) and Time Division-Synchronous ,Code Division Multiple Access (TD-SCDMA). Interference Power model is

Jiang Lei; Zhang Jianhua; Liu Ruoju; Zhang Ping

316

UWB microwave imaging system including circular array antenna  

Microsoft Academic Search

The paper describes the design of an ultra wideband (UWB) microwave imaging system employing a 12-element circular array antenna. The array uses compact tapered slot antenna (TSA) elements operating over 3.1–10.6 GHz band. The elements of the array are activated by two coaxial SP6T switches that are connected to a vector network analyser (VNA) to achieve monostatic or multi-static radar

Marek E. Bialkowski; Yifan Wang; Aslina Abu Bakar; Wee Chang Khor

2010-01-01

317

UWB array-based radar imaging using modified Kirchhoff migration  

Microsoft Academic Search

This paper presents a new modification of Kirchhoff migration algorithm for ultra-wideband (UWB) array-based radar imaging. The developed algorithm is evolved from traditional Kirchhoff migration which is based on the classical integral theorem of Helmholtz and Kirchhoff. The new algorithm is designed for array-based radar imaging with arbitrary multiple input multiple output (MIMO) configuration. The developed algorithm is compared with

X. Zhuge; T. G. Savelyev; A. G. Yarovoy; L. P. Ligthart

2008-01-01

318

An Analysis of 2D Target Positioning Accuracy for M-sequence UWB Radar System under Ideal Conditions  

Microsoft Academic Search

This paper describes analysis of target positioning accuracy for ultra wideband (UWB) maximum length binary sequence (M-sequence) radar system under ideal conditions in two dimensional space. In this case, it is shown that the target position estimation error is cased by quantization of time of arrival (TOA) measured by the radar system. The appropriate statistical quantities are suggested for describing

Michal AFTANAS; J. Rovnakova; M. Riskova; D. Kocur; M. Drutarovsky

2007-01-01

319

Ultra-wideband direction finding using fiber optic transversal filters  

NASA Astrophysics Data System (ADS)

This report describes a wideband electro-optic direction finding (DF) processor using an array of laser diodes, an array of photodetectors, and a network of fiber optic delay lines. This DF filter offers a potential operational bandwidth in excess of 10 GHz and allows for multiple, simultaneous beam angular responses with peaks that are independent of frequency. Two eight-laser, two-transversal filter laboratory test model DF devices, one using multimode optical fiber and the other single-mode fiber, were constructed. These experimental matched-delay filters are operable in the 200- to 1800- systems' sensitivity, dynamic range, angular resolution, and frequency response. It is concluded from theoretical and experimental results obtained in this investigation that the multitude DF device is slightly superior in performance to the single-mode system due to the higher throughput optical power levels possible with multimode systems. Further, it is concluded that the fiber optics matched-delay filter can be a useful device for ultra-wideband direction finding.

Pappert, S. A.

1987-03-01

320

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.

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

2010-01-01

321

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 à 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.

322

A robust CMOS RF front-end design for 3.1–4.8GHz MB-OFDM UWB system  

Microsoft Academic Search

This paper presents a robust RF front-end for 3.1-4.8-GHz direct-conversion Ultra-wideband (UWB) applications such as the MB-OFDM UWB. The circuits contain a gain controllable low-noise amplifier (LNA) with resistive feedback, a merged quadrature mixer with static current injection, and local oscillator (LO) buffers. Post-layout simulations show that the fully differential front-end achieves a maximum conversion gain of 25.5 dB and

Guang Yang; Wei Li; Ning Li; Junyan Ren

2008-01-01

323

Capacitive-Ended Interdigital Coupled Lines for UWB Bandpass Filters With Improved Out-of-Band Performances  

Microsoft Academic Search

This letter presents a novel ultra-wideband (UWB) microstrip bandpass filter on a microstrip line with improved out-of-band performances. A multiple-mode resonator (MMR) is first constituted to equally allocate its first three resonant frequencies in the 3.1-10.6-GHz UWB band. Two capacitive-ended interdigital coupled lines are then formed to assign their transmission zero towards the fourth-order resonant frequency of this MMR, thereby

Sheng Sun; Lei Zhu

2006-01-01

324

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

325

Wideband antenna EIRP measurements for various UWB waveforms  

Microsoft Academic Search

We experimentally investigate pulse shaping in the optical domain of ultra-wideband pulses and RF transmission via a wideband antenna. The effective isotropically radiated power (EIRP) is calculated based on the measured transmit power; the resultant power spectral density (PSD) is compared to the FCC (US Federal Communications Commission) power spectral mask for each of three generated pulse shapes: a Gaussian

Mehrdad Mirshafiei; Mohammad Abtahi; Sophie LaRochelle; Leslie A. Rusch

2008-01-01

326

Algorithms for Indoor Positioning Systems Using Ultra-Wideband Signals  

Microsoft Academic Search

Positioning systems and techniques have attracted more and more attention in recent years, in particular with satellite navigation technology as a tremendous enabler, and developments in indoor navigation. The work presented in this thesis has been conducted within the research project: \\\\HERE: indoor positioning based on UWB radio signals\\

J. Yan

2010-01-01

327

On the Fading Properties of a UWB Link in a Dynamic Environment  

NASA Astrophysics Data System (ADS)

The recent interest in ultra-wideband (UWB) systems requires an accurate modelling of the radio channel characteristics. Among these, the fading properties of the UWB channel are of particular interest in the development of the air interface. This paper reports on an experiment designed to study spatial and temporal fluctuations of the UWB signal conjoindy in the 3.1 to 11 GHz frequency band, in a typical indoor office environment. The proposed analysis of the small-scale amplitude distribution shows significant differences between the two concepts and provides novel results that complement the available studies.

Pagani, Pascal; Pajusco, Patrice

328

Ultra-wideband radio-over-optical fiber: Technologies and applications  

Microsoft Academic Search

This paper investigates the concepts, technologies and applications of ultra-wideband radio over optical fiber (UROOF) and provides overview of key results obtained through EC funded project UROOF. We study the theoretical aspects of the UROOF channel, and demonstrate experimentally, key features of this new technology, through a validation platform. UROOF envision that within 3-5 years, fiber optics will be widely

Moshe Ran; Yossef Ben-Ezra; Boris Lembrikov

2008-01-01

329

Ultra-wideband radar sensors for short-range vehicular applications  

Microsoft Academic Search

The recent approval granted by the Federal Communications Commission (FCC) for the use of ultra-wideband signals for vehicular radar applications has provided a gateway for the introduction of these sensors in the commercial arena as early as 2004. However, the rules governing the allowable spectral occupancy create significant constraints on the sensors' operation. This is further complicated by the variety

Ian Gresham; Alan Jenkins; Robert Egri; Channabasappa Eswarappa; Noyan Kinayman; Nitin Jain; Richard Anderson; Frank Kolak; Ratana Wohlert; Shawn P. Bawell; Jacqueline Bennett; Jean-Pierre Lanteri

2004-01-01

330

Comparison between two simulation techniques and measurement results for ultra wideband indoor radio channels  

Microsoft Academic Search

Two three-dimensional simulation techniques (Polyhedral Beam Tracing and Finite Difference Time Domain) for modeling an ultra wideband (850 MHz) indoor radio channel are compared among themselves and with experimental data. Measurements were performed within a typical hall (indoor) scenario at Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) to extract channel parameters such as the power delay profiles. I. INTRODUCTION

F. J. B. Barros; L. A. R. Ramirez; E. Costa; F. J. V. Hasselmann; G. L. Siqueira

2011-01-01

331

Design of Ultra-Wideband Substrate Integrated Waveguide (SIW) Filters in Zigzag Topology  

Microsoft Academic Search

In this letter we propose a modified substrate integrated waveguide (SIW) zigzag filter topology, which allows the flexible introduction of extra cross-couplings between non adjacent resonators. This novel topology permits to control the location of the transmission zeros, thus improving the resulting filter selectivity. Therefore, it has been used to design filters in compliance with the restrictive ultra-wideband European mask.

FermÍn Mira; Jordi Mateu; Santiago Cogollos; Vicente E. Boria

2009-01-01

332

Frequency domain detection for ultra-wideband communications in the indoor environment  

Microsoft Academic Search

We propose an innovative communication scheme for ultra-wideband systems which are based on impulse radio technologies. The proposed system relies on both the introduction of the cyclic prefix at the transmitter and the use of a frequency domain detector at the receiver. In particular, two different detection strategies based either on the zero forcing (ZF) or the minimum mean square

Tiziano Bianchi; Simone Morosi

2004-01-01

333

Improved Design Guidelines for the Ultra Wideband Monopole-Dielectric Resonator Antenna  

Microsoft Academic Search

This letter examines in detail multiple resonance phenomenon responsible for the ultra wideband response of the hybrid monopole-dielectric resonator antenna (DRA). The physical insight gained by this investigation has lead to improved guidelines for designing the antennas for any specified frequency band. These simple guidelines are then verified using both simulated and measured data

Debatosh Guha; Yahia M. M. Antar; Apisak Ittipiboon; Aldo Petosa; David Lee

2006-01-01

334

Wavelet-based impulse reconstruction in UWB-radar  

Microsoft Academic Search

In this paper we present a technique for evaluating shape and position of an ultra wideband pulse in noisy data, based on the continuous wavelet transformation. By using a complex extension for both the signal and the mother wavelet, the received impulse can be completely characterized by only four parameters, without the necessity of exact knowledge of the pulse shape.

Klaus Pourvoyeur; Andreas Stelzer; G. Ossberger; Thomas Buchegger; M. Pichler

2003-01-01

335

Implementation and Performance Analysis of Noncoherent UWB Transceiver Under LOS Residential Channel Environment  

NASA Astrophysics Data System (ADS)

This paper focuses on two things. One is to describe implementation of a Low-Rate Ultra-Wideband (LR-UWB) transceiver for low power Wireless Personal Area Network (WPAN) applications. The other is to derive the Bit Error Rate (BER) performance of the proposed system. At first, in order to implement low-power and low-complexity transceiver, we design a non-coherent On-Off-Keying(OOK) UWB system by adopting the architecture of the simplified asynchronous transmission and the edge-triggered pulse transmission, which makes the system performance independent of the shape of the transmitted waveform, robust to multipath channels. The designed non-coherent UWB transceiver architecture has an advantage of the simple realization since any mixer, high-speed correlator, and very high-sampling A/D converter are not necessary at the cost of performance degradation of about 3dB. Further, the designed non-coherent UWB transceiver is actually implemented with the wireless CANVAS prototyping testbed in short range indoor application environment such as a lecture room. The implemented prototype testbed is proven to offer the data rate of 9.6kbps and 115kbps on the conditions of Peer-to-Peer (P-to-P) in the indoor channel within the range of about 10m. At second, we analyze the bit error rate (BER) performance of this proposed system under the line-of-sight (LOS) residential channel environment. As a result, it is necessary to choose appropriate number of Window Bank(WB)s for better BER performance.

Choi, Sungsoo; Koo, Insoo; Kim, Youngsun

336

A Power Efficient HBT Pulse Generator for UWB Radars  

Microsoft Academic Search

High-resolution radars require the transmission and reception of extremely high-bandwidth pulses. The generation of such pulses is a challenging task, especially for low power portable applications. In this paper we present a new approach to face this problem. The proposed approach uses a standard negative impedance LC oscillator to generate fully-differential pulses in the 6 to 8GHz frequency range. This

Alessio Cacciatori; Laura Lorenzi; Luigi Colalongo

2007-01-01

337

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

338

State of arts in ultra wideband (UWB) wireless technology and global harmonization  

Microsoft Academic Search

As a center of mobile multimedia of the 21st century, it is very much looking forward to explosion of R&D and business of various wireless communication systems. In order to maintain advancement of communications and its related industries in Japan, there is a demand to keep creating new high technologies and theories and to educate a high level of experts

Ryuji KOHNO

2004-01-01

339

Design of 3.1–10.6 GHz ultra-wideband CMOS low noise amplifier with current reuse technique  

Microsoft Academic Search

A new low complexity ultra-wideband 3.1–10.6GHz low noise amplifier (LNA), designed in a chartered 0.18?m RFCMOS technology, is presented in this paper. The ultra-wideband LNA only consists of two simple amplifiers with an inter-stage inductor connected. The first stage utilizing a resistive current reuse and dual inductive degeneration techniques is used to attain a wideband input matching and low noise

Qiuzhen Wan; Chunhua Wang

2011-01-01

340

Low-Power CMOS RF front-end for non-coherent IR-UWB receiver  

Microsoft Academic Search

This paper presents a low-power CMOS RF front-end for 3-5 GHz non-coherent impulse-radio ultra-wideband (IR-UWB) receiver. The proposed front-end comprises a variable-gain low noise amplifier (VG-LNA), an active balun and an analog squarer. Current reuse topology has been adopted in both VG-LNA and active balun to reduce the power consumption. The squarer design is based on the quadratic law of

Yuan Gao; Yuanjin Zheng; Chun-Huat Heng

2008-01-01

341

Joint distributed synchronization and positioning in UWB ad hoc networks using TOA  

Microsoft Academic Search

In this paper, we describe a global distributed solution that enables the simultaneous performance of time synchronization and positioning in ultra-wideband (UWB) ad hoc networks. On the one hand, the proposed synchronization scheme basically relies on cooperative two-way-ranging\\/time-of-arrival transactions and a diffusion algorithm that ensures the convergence of clock parameters to average reference values in each node. Although the described

Benoît Denis; Jean-Benoît Pierrot; Chadi Abou-Rjeily

2006-01-01

342

On the CRLB and Low-Complexity Channel Estimation for UWB Communications  

Microsoft Academic Search

The Cramer-Rao lower bound (CRLB) is derived for the channel estimation of direct sequence-code division multiple access ultra-wideband (DS-CDMA UWB) communication system. We have modified the channel model and reduced the number of estimation parameters. Furthermore, a low-complexity data-aided Least Square (LS) channel estimation algorithm is proposed for the modified model. In addition, the problem of designing orthogonal training sequence

Xiaoli Wang; Hongya Ge

2007-01-01

343

Narrowband interference reduction in UWB systems based on spreading sequence spectrum shaping  

Microsoft Academic Search

This paper presents a way to reduce the effect of narrowband interference (due to either an intentional jamming or the effect of traditional non-spread-spectrum transmission) in ultra-wideband (UWB) communication systems based on asynchronous direct-sequence code-division multiple access (DS-CDMA). To reach this goal, we derive a closed-form expression for the bit error probability in additive white Gaussian noise (AWGN) channel, where

Mauro Mangia; Riccardo Rovatti; Gianluca Setti

2010-01-01

344

Application of space-time codes to OFDM UWB systems with under-sampled receivers  

Microsoft Academic Search

In this paper, the application of space-time codes (STCs) to orthogonal frequency division multiplexing (OFDM) ultra-wideband (UWB) systems with under-sampled receivers is investigated. In this system, the total available bandwidth is divided into Mt smaller sub-bands. OFDM modulation is adopted in each sub-band, and data are transmitted in all the sub-bands simultaneously. The transmitter properly encodes the data in sub-bands

Wan-Ting Chan; Wei-De Wu; Chung-Hsuan Wang; Mao-Ching Chiu; Chi-chao Chao

2005-01-01

345

Novel UWB Bandpass Filter Using CPW-to-Microstrip Transition Structure  

NASA Astrophysics Data System (ADS)

A novel bandpass filter (BPF) for an ultra-wideband (UWB) system is proposed in this letter. The BPF consists of four coplanar stripline (CPS)-to-microstrip transitions. Each transition is employed for broad electromagnetic (EM) coupling between a short-circuited CPS and an open-circuited microstrip line. The equivalent circuit model of the proposed geometry is derived and utilized in the impedance and mode matching analysis. Measured results show good agreement with the analysis and simulated ones.

Lee, Tae-Hak; Baik, Jung-Woo; Pyo, Seongmin; Kim, Young-Sik

346

Novel UWB Bandpass Filter Using CPW-to-Microstrip Transition Structure  

Microsoft Academic Search

A novel bandpass filter (BPF) for an ultra-wideband (UWB) system is proposed in this letter. The BPF consists of four coplanar stripline (CPS)-to-microstrip transitions. Each transition is employed for broad electromagnetic (EM) coupling between a short-circuited CPS and an open-circuited microstrip line. The equivalent circuit model of the proposed geometry is derived and utilized in the impedance and mode matching

Tae-Hak Lee; Jung-Woo Baik; Seongmin Pyo; Young-Sik Kim

2009-01-01

347

A PPM Gaussian monocycle transmitter for ultra-wideband communications  

Microsoft Academic Search

A Gaussian pulse generator incorporating a pulse position modulator for use in an impulse radio ultrawideband system is described. The pulse generator is preceded by a programmable pulse position modulator and comprises a cascade of complex first-order systems, which, in turn, are made up of differential pairs employing partial positive feedback. The resulting PPM Gaussian pulse generator is designed in

S. Baggat; Woiiter A. Serdijn; John R. Long

2004-01-01

348

Focus of attention in UWB SAR image  

NASA Astrophysics Data System (ADS)

The previous work demonstrate that detection based on the Laguerre transform exploits the 1D resonance response of the metallic target in the ultra wideband (UWB) synthetic aperture radar (SAR) images. The success is mainly due to the fact that Laguerre function space captures the information contained in the resonant response. However, in that case, only 1D resonance response information were utilized. In this paper, a new CFAR statistics based on spatial resonance templates is proposed. Based on the GLRT, the new CFAR statistics is formulated using the spatial extent of targets' resonance responses in the UWB SAR scenario. In the end, we show that the proposed CFAR statistics yields more robust detection.

Yen, Li-Kang; Principe, Jose C.; Fisher, John W.

1997-06-01

349

Ultra-Wideband Tapered Slot Antenna Arrays with Parallel-Plate Waveguides  

NASA Astrophysics Data System (ADS)

Owing to their ultra-wideband characteristics, tapered slot antennas (TSAs) are used as element antennas in wideband phased arrays. However, when the size of a TSA is reduced in order to prevent the generation of a grating lobe during wide-angle beam scanning, the original ultra-wideband characteristics are degraded because of increased reflections from the ends of the tapered slot aperture. To overcome this difficulty, we propose a new antenna structure in which parallel-plate waveguides are added to the TSA. The advantage of this new structure is that the reflection characteristics of individual antenna elements are not degraded even if the width of the antenna aperture is very small, i.e., approximately one-half the wavelength of the highest operating frequency. In this study, we propose a procedure for designing the new antenna through numerical simulations by using the FDTD method. In addition, we verify the performance of the antenna array by experiments.

Yamaguchi, Satoshi; Miyashita, Hiroaki; Takahashi, Toru; Otsuka, Masataka; Konishi, Yoshihiko

350

Ultra-wideband omnidirectional conformable low-profile mode-0 spiral-mode microstrip (SMM) antenna  

Microsoft Academic Search

An ultra-wideband low-profile platform-conformable omnidirectional antenna based on the mode-0 SMM antenna has been developed. Its 10:1 gain bandwidth is slightly larger than that of the well-established conical monopole, yet its height is less than half that of the monopole. Compared with other well-known low-profile omnidirectional antennas with a gain bandwidth over 2:1, its gain bandwidth of 10:1 is much

Johnson J. H. Wang; Chris J. Stevens; D. J. Triplett

2005-01-01

351

An ultra-wideband vertical transition from microstrip to stripline in PCB technology  

Microsoft Academic Search

An ultra-wideband transition from microstrip to stripline in PCB technology is presented applying only through via holes for simple fabrication. The design is optimized using full-wave EM simulations. A prototype is manufactured and measured achieving a return loss better than 8.7dB and an insertion loss better than 1.2 dB in the FCC frequency range. A meander-shaped delay line in stripline

Mario Leib; Michael Mirbach; Wolfgang Menzel

2010-01-01

352

A 4?7GHz ultra wideband VCO with tunable active inductor  

Microsoft Academic Search

An ultra-wideband CMOS VCO with tuning range of 3.8~7.4 GHz is presented, using tunable active inductor (TAI). The inductance of TAI can be tuned from 0.34~0.61 nH by active tunable resistor, and exhibits a quality factor of about 90. The VCO is designed in a 0.18 um CMOS technology with power dissipation of around 29.1 mW and phase noise (PN)

M. Mehrabian; A. Nabavi; N. Rashidi

2008-01-01

353

pHEMT and mHEMT Ultra Wideband Millimeterwave Balanced Resistive Mixers  

Microsoft Academic Search

Two ultra wideband millimeterwave single balanced resistive mixers utilizing a Marchand balun for the LO-hybrid are simulated, fabricated and characterized for 30-60 GHz in both up and down conversion. Two different versions of the mixer were manufactured in a commercial pHEMT-MMIC and a mHEMT-MMIC process respectively. A measured down conversion loss of approximately 6 to 12 dB over the whole

Sten Gunnarsson; Klas Yhland; Herbert Zirath; Ericsson AB

2003-01-01

354

Timing Acquisition with Noisy Template for Ultra-Wideband Communications in Dense  

Microsoft Academic Search

Timing acquisition is critical to enabling the poten- tial of ultra-wideband radios in high-speed, short-range indoor wireless networking. An effective timing acquisition method should not only operate at a low sampling rate to reduce implementation complexity and synchronization time, but also be able to collect sufficient signal energy in order to operate in a rea- sonable transmit-SNR regime. Energy capture

Zhi Tian; Lin Wu

355

MEMS-integrated ultra-wideband terahertz traveling wave tube amplifier  

Microsoft Academic Search

An ultra-wideband TWT amplifier is being developed for THz communication, sensing, and imaging applications. Using FDTD-PIC simulation, we demonstrated that, for an electron beam power of 5 kW, a staggered double grating array produces 150 to 275 W, corresponding to 3 - 5.5% efficiency, at 0.22 THz over ~ 30% bandwidth with greater than 12 dB\\/cm growth rate. The Ka-band

Young-Min Shin; Jinfeng Zhao; Larry R. Barnett; Neville C. Luhmann Jr

2009-01-01

356

A Digital Polar Amplifier for Ultra-Wideband with dynamic element matching  

Microsoft Academic Search

Digital polar architectures have been employed on wireless standards with low fractional bandwidths (FB) and high power requirements. To study if they can be adopted for low-power and high FB requirements, we propose a low-voltage 3-bit Digital Polar Amplifier (DPA) for Ultra-Wideband (FB of 15.4%). The DPA comprises 7 parallel RF amplifiers driven by the RF phase-modulated component and 7

Kwang-Hwee Seah; Michael Yan-Wah Chia

2010-01-01

357

A 30 GHz Variable Gain Amplifier With High Output Voltage Swing for Ultra-Wideband Radar  

Microsoft Academic Search

This paper reports on the analysis, design and characterization of a 30 GHz fully differential variable gain amplifier for ultra-wideband radar systems. The circuit consists of a variable gain differential stage, which is fed by two cascaded emitter followers. Capacitive degeneration and inductive peaking are used to enhance bandwidth. The maximum differential gain is 11.5 dB with plusmn1.5 dB gain

Benjamin Sewiolo; Georg Fischer; Robert Weigel

2009-01-01

358

Dual Time-Interleaved Successive Approximation Register ADCs for an Ultra-Wideband Receiver  

Microsoft Academic Search

Ultra-wideband radio requires Nyquist sampling rates of at least 500 MS\\/s with low resolutions. While flash is the traditional choice for these specifications, a comparative energy model is used to show the potential energy savings of the time-interleaved successive approximation register architecture, which requires only a linear number of comparisons versus exponential for flash. A dual 500-MS\\/s, 5-bit ADC chip

Brian P. Ginsburg; Anantha P. Chandrakasan

2007-01-01

359

pHEMT and mHEMT ultra wideband millimeterwave balanced resistive mixers  

Microsoft Academic Search

Two ultra wideband millimeterwave single balanced resistive mixers utilizing a Marchand balun for the LO-hybrid are simulated, fabricated and characterized for 30-60 GHz in both up and down conversion. Two different versions of the mixer were manufactured in a commercial pHEMT-MMIC and a mHEMT-MMIC process respectively. A measured down conversion loss of approximately 6 to 12 dB over the whole

S. Gunnarsson; Klas Yhland; H. Zirath

2004-01-01

360

The ultra wideband transfer function representation of complex three-dimensional electromagnetic structures  

Microsoft Academic Search

the network-oriented ultra wideband transfer function representation of complex three-dimensional elec- tromagnetic structures is investigated. The transfer function is consisting of two parts: entire function and rational or pole function. The reduction of a rank of an ill-conditioned matrix is performed in accordance with the spectral crite- rion. System identification is carried out by the Matrix Pen- cil Method (MPM)

Yury Kuznetsov; Andrey Baev; Fabio Coccetti; Peter Russer

2004-01-01

361

Compact permittivity-matched ultra-wideband antennas for biomedical imaging  

Microsoft Academic Search

Ultra-wideband biomedical radar systems are an important means for the diagnostic inspection and monitoring of physiological signatures. Geometrically small antennas and high- resolution imaging techniques are required for such applications. We have developed compact ceramic double-ridged horn anten- nas for contact-mode measurements with a permittivity matched to human tissues. In the focus of the present work is the experi- mental

F. Scotto di Clemente; M. A. Hein; R. Stephan

2011-01-01

362

A low-power OOK ultra-wideband transmitter with power cycling and spectral flexibility  

Microsoft Academic Search

This paper presents a reconfigurable 0.13 ?m CMOS impulse radio ultra-wideband transmitter which supports the on-off keying modulation scheme. The transmitter allows for control of the center frequency and bandwidth of the output spectrum, thus providing large spectrum flexibility. A power cycling scheme is implemented to reduce the power consumption, and allows the system to operate within stringent power requirements.

Raslen Hamdi; Kamel Elkhenissi; Dominic Deslandes; Frederic Nabki

2010-01-01

363

A Frequency Triplexer for Ultra-Wideband Systems Utilizing Combined Broadside and Edge-Coupled Filters  

Microsoft Academic Search

A fully integrated triplexer for multiband ultra-wideband radio is presented. The triplexer utilizes a microstrip network and three combined broadside- and edge-coupled filters. It is fully integrated in a printed circuit board with low requirements on the printed circuit board process tolerance. Three flat subbands in the frequency band 3.1-4.8 GHz have been achieved. The group delay variation within each

Magnus Karlsson; PÄr Hakansson; Shaofang Gong

2008-01-01

364

An ultra-wideband log-periodic vibrator of the mirror antenna  

Microsoft Academic Search

The paper is devoted to investigation of ultra-wideband logarithmically periodic vibrators of mirror antennas. The vibrators\\u000a have the form of cophasal antenna arrays consisting of two log-periodic dipole radiators, comprising a pyramid arranged in\\u000a the H-plane. The asymmetric and symmetric types of excitation of these dipoles are considered, with their calculated and measured\\u000a characteristics included.

F. F. Dubrovka; N. N. Litvin; S. Ye. Martynyuk; M. N. Bilanovskii; G. A. Yena

2007-01-01

365

Integrable high order UWB pulse photonic generator based on cross phase modulation in a SOA-MZI.  

PubMed

We propose and experimentally demonstrate a potentially integrable optical scheme to generate high order UWB pulses. The technique is based on exploiting the cross phase modulation generated in an InGaAsP Mach-Zehnder interferometer containing integrated semiconductor optical amplifiers, and is also adaptable to different pulse modulation formats through an optical processing unit which allows to control of the amplitude, polarity and time delay of the generated taps. PMID:24104177

Moreno, Vanessa; Rius, Manuel; Mora, José; Muriel, Miguel A; Capmany, José

2013-09-23

366

A 0.18- CMOS Selective Receiver Front-End for UWB Applications  

Microsoft Academic Search

This paper addresses the problem of 5-6-GHz WLAN interferer rejection in a direct-conversion receiver front-end for multi-band orthogonal frequency division multiplexing (OFDM) ultra-wideband (UWB) applications. The IC, realized in a 0.18-mum CMOS technology, comprises a single-ended voltage-voltage feedback low-noise amplifier (LNA) and a quadrature mixer. The LNA employs a double-peak single-notch network in the output load, amplifying UWB groups #1

Giuseppe Cusmai; Massimo Brandolini; Paolo Rossi; Francesco Svelto

2006-01-01

367

Transmit Antenna Selection for Spatial Multiplexing UWB MIMO Systems Using Sorted QR Decomposition  

NASA Astrophysics Data System (ADS)

In this letter, a post-detection signal to noise ratio (SNR) is considered for transmit antenna selection, when a sorted QR decomposition (SQRD) algorithm is used for signal detection in spatial multiplexing (SM) ultra-wideband (UWB) multiple input multiple output systems. The post-detection SNR expression is obtained using a QR factorization algorithm based on a sorted Gram-Schmidt process. The employed antenna selection criterion is to utilize the largest minimum post-detection SNR value. It is shown via simulations that the antenna selection significantly enhances the BER performance of the SQRD-based SM UWB systems on a log-normal multipath fading channel.

Kim, Sangchoon

368

Fast and Accurate 3-D Imaging Algorithm with Linear Array Antennas for UWB Pulse Radars  

NASA Astrophysics Data System (ADS)

Pulse radars with UWB signals are promising as a high-resolution imaging technique that can be used for the non-destructive measurement of surface details in industrial products such as antennas and aircraft. We have already proposed a fast 3-D imaging algorithm, SEABED, that utilizes a reversible transform between the time delay and the target boundary. However, data acquisition is time-consuming when obtaining an accurate image because it assumes a mono-static radar with 2-D scanning of an antenna. In this paper, we utilize linear array antennas and propose a fast and accurate imaging algorithm. We extend the reversible transform for mono-static radars to apply to bi-static radars to reduce the data acquisition time. The effectiveness of the proposed method is verified with numerical simulations and experiments.

Kidera, Shouhei; Kani, Yusuke; Sakamoto, Takuya; Sato, Toru

369

A single-in-differential-out CMOS RF front-end for UWB 6–9GHz applications  

Microsoft Academic Search

An integrated ultra-wideband CMOS RF front-end for UWB 6-9 GHz application is presented in this paper. A single-in-differential-out gain controllable low noise amplifier and a current-reuse bleeding IQ merged quadrature mixer are integrated as the RF front-end. This ESD protected module is implemented in TSMC 0.13?m RF CMOS process and the post-layout simulation results shows that it achieves a high

Feng Zhou; Wei Li; Ting Gao; Fei Lan; Ning Li; Junyan Ren

2010-01-01

370

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

371

Chaotic ultra-wideband radio generator based on an optoelectronic oscillator with a built-in microwave photonic filter.  

PubMed

We induce a microwave photonic bandpass filter into an optoelectronic oscillator to generate a chaotic ultra-wideband signal in both the optical and electrical domain. The theoretical analysis and numerical simulation indicate that this system is capable of generating band-limited high-dimensional chaos. Experimental results coincide well with the theoretical prediction and show that the power spectrum of the generated chaotic signal basically meets the Federal Communications Commission indoor mask. The generated chaotic carrier is further intensity modulated by a 10 MHz square wave, and the waveform of the output ultra-wideband signal is measured for demonstrating the chaotic on-off keying modulation. PMID:22614596

Wang, Li Xian; Zhu, Ning Hua; Zheng, Jian Yu; Liu, Jian Guo; Li, Wei

2012-05-20

372

A high-resolution 3-D imaging algorithm with linear array antennas for UWB pulse radar systems  

Microsoft Academic Search

UWB pulse radar systems have a great potential for a high-resolution imaging in indoor environments. For a real-time imaging, we have already proposed a fast 3-dimensional imaging algorithm called SEABED based on a reversible transform BST (boundary scattering transform) between the received signals and the target shape. SEABED can be applied only to a mono-static radar system. Therefore, the resolution

Shouhei KIDERA; Takuya SAKAMOTO; Toru SATO

2006-01-01

373

Ultra wideband radar imaging: An approach to monitor the water accumulation in the human body  

Microsoft Academic Search

Investigations in the usage of the UWB technology for medical imaging, in particular for the detection of breast cancer, have recently achieved more and more interest. For such an application, many methods, for example confocal or beamforming techniques etc., basing on the UWB technology, have been used. Together with the cancer detection, an important area of potential application of UWB

Elena Pancera; Thomas Zwick; Werner Wiesbeck

2010-01-01

374

79 GHz UWB automotive short range radar - Spectrum allocation and technology trends  

NASA Astrophysics Data System (ADS)

Automotive UWB (Ultra-Wideband) short range radar (SSR) is on the market as a key technology for novel comfort and safety systems. SiGe based 79 GHz UWB SRR will be a definite candidate for the long term substitution of the 24 GHz UWB SRR. This paper will give an overview of the finished BMBF joint project KOKON and the recently started successing project RoCC, which concentrate on the development of this technology and sensor demonstrators. In both projects, the responsibilities of Daimler AG deal with application based sensor specification, test and evaluation of realized sensor demonstrators. Recent UWB SRR frequency regulation approaches and activitites will be introduced. Furthermore, some first results of Daimler activities within RoCC will be presented, dealing with the packaging and operation of these sensors within the complex car environment.

Bloecher, H.-L.; Sailer, A.; Rollmann, G.; Dickmann, J.

2009-05-01

375

Performance evaluation for WiMedia Ultra-wideband simultaneous transmission with wireless LAN over cable and fiber  

Microsoft Academic Search

This paper investigates the performances of the WiMedia Ultra-wideband signal simultaneously transmitted with the wireless local area nework signals using either coaxial cables or radio-over-fiber links. Error vector magnitude and packet error rate were carried out to evaluate the system characteristics.

Yong-Xin Guo; Viet Hung Pham; Ming-Li Yee; Ling Chuen Ong; Bin Luo

2008-01-01

376

Elderly-Care Motion Monitoring Sensor Using Ultra-wideband Radio  

NASA Astrophysics Data System (ADS)

Requirement for monitoring the state of the elderly in care facilities is increasing year by year and the increase in accidents involving them becomes great concern. In this paper, an ultra-wideband impulse-radio monitoring sensor is suggested which focuses on the bed state most critical to the elderly that need the assistance immediately. Employing our developed state estimation algorithm, various states can be detected that includes sleeping in bed, sitting up in bed and going in and out from the room. The measurements were conducted in a room assumed the care facilities and the performance is investigated where various scenarios are considered. The measurement result shows that the detection rate is more than 91%.

Ota, Kyohei; Otsu, Mitsugu; Ota, Yuki; Kajiwara, Akihiro

377

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

378

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

379

Pulse distortion and optimum transmit waveform for pulse-based UWB communications  

Microsoft Academic Search

This paper initiates a new investigation of optimum transmission waveforms in the presence of per-path pulse wave shape distortion - a physical mechanism unique to impulsive signals. First, the transient electromagnetic analysis is carried out to derive, for the first time, closed-form expressions for the impulse responses of several canonical channels that are suitable for communication engineers. Second, numerical calculation

Chenming Zhou; Robert C. Qiu

2009-01-01

380

Drosophila melanogaster viability and mutability under the influence of low energy microwave monochromatic and ultra wideband impulse field  

Microsoft Academic Search

The influence of microwave radiation (int = 35 GHz, intensity P = 30, 70, 180, 265 mW \\/cm2) and ultra wideband irradiation at irradiation intensity of 10-5, 10-4, 10 -3, and 10-2 W\\/cm2 on stocks of Drosophila melanogaster was investigated. Irradiation was performed on the stage of egg< exposure time was 10 sec... Irradiation by monochromatic radiation (35 GHz) of

Yuriy Shckorbatov; Vladimir Pasiuga; Lyubov Shakina; Valentin Grabina; Nikolai Kolchigin; Dmitrij Ivanchenko; Oleg Kazansky; Viktor Bykov

2007-01-01

381

Ultra-wideband time-delay line inspired by composite right\\/left-handed transmission line unit cell  

Microsoft Academic Search

This paper presents a design of ultra-wideband time-delay line inspired by the composite right\\/left-handed transmission line (CRLH TL) unit cell. A rotated version of the conventional CRLH TL unit cell is used to increase the operating bandwidth. The time-delay line is optimized using computer simulation and then fabricated on a PCB for measurement. For comparison, the time-delay lines using the

J. Zhang; S. W. Cheung; T. I. Yuk

2010-01-01

382

Low-loss ultra-wideband transition between conductor-backed coplanar waveguide and substrate integrated waveguide  

Microsoft Academic Search

A novel transition between conductor-backed coplanar waveguide (CBCPW) and substrate integrated waveguide (SIW) is presented for microwave and millimeter-wave integrated circuit design. The proposed integrated transition that can provide simultaneous field and impedance matching, exhibits outstanding low-loss performances over an ultra-wideband range (entire Ka-band in our case). In this work, a generalized impedance inverter whose parameters are accurately extracted by

Xiao-Ping Chen; Ke Wu

2009-01-01

383

Compact ultra-wideband antenna with inverted U-shaped slot and parachute-like radiation patch  

Microsoft Academic Search

A simple and compact wide-slot antenna for ultra-wideband application is presented. The antenna consists of an inverted U-shaped slot on a printed circuit board ground plane and a parachute-like radiation patch which is fed by a 50-? microstrip line. The antenna is built on a standard low-cost FR4 substrate with a whole size of 22?30?1 mm3. The measured and simulated

Ling Xiong; Peng Gao

2012-01-01

384

Performances of an ultra compact, high-power, monocycle pulse former for WB and UWB applications  

Microsoft Academic Search

This paper presents the design and the performances of an ultra compact, general-purpose, and high-power ultrawide band (UWB) source named GIMLI. The system was developed for dual use, from laboratory to battlefield applications. The power supply is a dedicated coaxial Marx generator composed of specifically designed stages. In an 11 stages configuration, the rise time can be less than 15

P. Delmote; J.-P. Duperoux; F. Bieth; S. Pinguet

2011-01-01

385

Multiband OFDM-UWB signals over hybrid fiber-wireless Link  

NASA Astrophysics Data System (ADS)

The Orthogonal Frequency Division Multiplexing Ultra-Wideband (OFDM-UWB) technique that widely used for the new emerging networks requires further investigation in terms of fiber length and UWB signal degradation. Simulations are used in this work to estimate the system performance which consists of two main links: wireless and optical, where the channel is considered as point to point between the UWB transmitter and the UWB receiver. In this paper, we demonstrate the use of UWB signals of carrying data to the end users within a campus area through an optical fiber link. A cost effective optical components are used in the system. The UWB signals are transmitted over a channel bandwidth of 528 MHz via low bit rate OFDM-subcarriers. Then, the accumulated data from each OFDM subcarrier is transmitted over an optical channel. Finally, UWB signals are wirelessly distributed to the end user over a short distance depending on the data rate being used. For this point to point system, using simulations, the performance of the system in terms of the bit error rate (BER) is examined. The results show that the wireless channel effects have the larger impact on the overall system performance compared with the fiber length effect.

Kenshil, S.; Rashwan, G.; Matin, M.

2012-10-01

386

Time-Reversal Based Range Extension Technique for Ultra-Wideband (UWB) Sensors and Applications in Tactical Communications and Networking.  

National Technical Information Service (NTIS)

This report summarizes our research and development work in the last quarter of year 2008. We have reached a practical limit in terms of sampling rate and bandwidth. Listed below are major achievements during the quarter: (1) improved waveform generator: ...

N. Guo P. Zhang R. C. Qui Y. Song Z. Hu

2009-01-01

387

Accurate Permittivity Measurements for Microwave Imaging via Ultra-Wideband Removal of Spurious Reflectors  

PubMed Central

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 estimate of the variability of the hidden material, such internal moisture, thereby alerting personnel to damaging levels of the hidden moisture before material degradation occurs. One impediment to this type of imaging occurs with nearby objects create strong reflections that create destructive and constructive interference, at the receiver, as the material is conveyed past the imaging antenna array. In an effort to remove the influence of the reflectors, such as metal bale ties, research was conducted to develop an algorithm for removal of the influence of the local proximity reflectors from the microwave images. This research effort produced a technique, based upon the use of ultra-wideband signals, for the removal of spurious reflections created by local proximity reflectors. This improvement enables accurate microwave measurements of moisture in such products as cotton bales, as well as other physical properties such as density or material composition. The proposed algorithm was shown to reduce errors by a 4:1 ratio and is an enabling technology for imaging applications in the presence of metal bale ties.

Pelletier, Mathew G.; Viera, Joseph A.; Wanjura, John; Holt, Greg

2010-01-01

388

Accurate permittivity measurements for microwave imaging via ultra-wideband removal of spurious reflectors.  

PubMed

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 estimate of the variability of the hidden material, such internal moisture, thereby alerting personnel to damaging levels of the hidden moisture before material degradation occurs. One impediment to this type of imaging occurs with nearby objects create strong reflections that create destructive and constructive interference, at the receiver, as the material is conveyed past the imaging antenna array. In an effort to remove the influence of the reflectors, such as metal bale ties, research was conducted to develop an algorithm for removal of the influence of the local proximity reflectors from the microwave images. This research effort produced a technique, based upon the use of ultra-wideband signals, for the removal of spurious reflections created by local proximity reflectors. This improvement enables accurate microwave measurements of moisture in such products as cotton bales, as well as other physical properties such as density or material composition. The proposed algorithm was shown to reduce errors by a 4:1 ratio and is an enabling technology for imaging applications in the presence of metal bale ties. PMID:22163668

Pelletier, Mathew G; Viera, Joseph A; Wanjura, John; Holt, Greg

2010-09-10

389

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

2013-07-01

390

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 40–50%.

Jacobsen, S.; Birkelund, Y.

2010-01-01

391

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

392

Transmission over UWB channels with OFDM system using LDPC coding  

NASA Astrophysics Data System (ADS)

Hostile wireless environment requires use of sophisticated signal processing methods. The paper concerns on Ultra Wideband (UWB) transmission over Personal Area Networks (PAN) including MB-OFDM specification of physical layer. In presented work the transmission system with OFDM modulation was connected with LDPC encoder/decoder. Additionally the frame and bit error rate (FER and BER) of the system was decreased using results from the LDPC decoder in a kind of turbo equalization algorithm for better channel estimation. Computational block using evolutionary strategy, from genetic algorithms family, was also used in presented system. It was placed after SPA (Sum-Product Algorithm) decoder and is conditionally turned on in the decoding process. The result is increased effectiveness of the whole system, especially lower FER. The system was tested with two types of LDPC codes, depending on type of parity check matrices: randomly generated and constructed deterministically, optimized for practical decoder architecture implemented in the FPGA device.

Dziwoki, Grzegorz; Kucharczyk, Marcin; Sulek, Wojciech

2009-06-01

393

Ultra-wideband coaxial hybrid coupler for load resilient ion cyclotron range of frequency heating at fusion plasmas  

SciTech Connect

We designed a high power and ultra-wideband two-section 3 dB coaxial hybrid coupler for load resilient ion cyclotron range of frequency heating by configuring asymmetric impedance matching using a three-dimensional simulation code, hfss. By adjusting the characteristic impedances of main and coupled lines of the hybrid coupler, we realized that the bandwidth of the proposed circuit is not only wider than that of a conventional three-section coupler, but also that the bandwidth is almost twice as wide compared to the conventional two-section hybrid coupler while maintaining the identical overall size.

Kim, H. J.; Bae, Y. S.; Yang, H. L.; Kwak, J.-G. [National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); Wang, S. J. [Korea Atomic Energy Research Institute, Daejeon 305-333 (Korea, Republic of); Kim, B. K.; Choi, J. J. [Department of Electronics Convergence Engineering, Kwangwoon University, Seoul 139-701 (Korea, Republic of)

2012-06-25

394

Wimedia-Defined, Ultra-Wideband Radio Transmission over Optical Fibre  

Microsoft Academic Search

We demonstrate combined wireless and optical fibre channel transmission of Wimedia- defined, MB-OFDM, UWB radio by directly modulation of 4.8GHz VCSELs. Range extension to 400m for multi-cell HDTV sharing is achievable with low-cost remote antenna units.

Y. Ben-Ezra; M. Ran; E. Borohovich; A. Leibovich; M. P. Thakur; Roberto Llorente; S. D. Walker

2008-01-01

395

Parameter estimation of double exponential pulses (EMP, UWB) with least squares and Nelder Mead algorithm  

Microsoft Academic Search

Transient test pulses like electromagnetic pulse and ultrawide-band are commonly described by rise time tr, pulse length tfwhm and the maximum amplitude Eˆ. Simulating the effects of varying pulses an analytical description of the pulses is necessary, which is given by a double exponential form with the parameters ?, ? and E0. This paper describes the link between the parameters

Michael Camp; Heyno Garbe

2004-01-01

396

Experimental demonstration of 2 Gbps IR-UWB transmission over 100m GI-POF using novel pulse generation technique  

Microsoft Academic Search

We propose a novel generation technique for IR-UWB signal employing the weighted sum of modified doublets. We experimentally demonstrate a DSP-based BER measurement of 2 Gbps IR-UWB over 100m PF GI-POF for in-building network applications.

S. T. Abraha; C. M. Okonkwo; E. Tangdiongga; A. M. J. Koonen

2010-01-01

397

Joint semi-blind channel and timing estimation for generalized UWB transmitted reference systems  

Microsoft Academic Search

Synchronization is one of the most critical issues in ultra-wideband communications due to the short duration of the pulses. In this work, a semi-blind synchronization scheme based on maximum-likelihood techniques to recover both symbol and frame timing is developed. The proposed algorithm performs joint timing and channel estimation and is thus robust against moderate timing errors. The probability of acquisition

Stefan Franz; Cecilia Carbonelli; Urbashi Mitra

2007-01-01

398

RF Chipset for Impulse UWB Radar Using 0.13- InP-HEMT Technology  

Microsoft Academic Search

A novel ultra-wideband impulse radar architecture for 24-GHz-band short-range radar was developed using 0.13-mum InP high electron-mobility technology. The transmitter part generates an extremely wideband impulse from a pulse generator and then filters it through a bandpass filter. The obtained impulse had a full width at half maximum of 9 ps. Its frequency spectrum spread from dc to over 40

Yoichi Kawano; Yasuhiro Nakasha; Kaoru Yokoo; Satoshi Masuda; Tsuyoshi Takahashi; Tatsuya Hirose; Yasuyuki Oishi; Kiyoshi Hamaguchi

2006-01-01

399

A 264 MHz CMOS Gm—C LPF for ultra-wideband standard  

NASA Astrophysics Data System (ADS)

A 264 MHz CMOS 4th Gm—C 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

400

Ultra-Wideband Duplexers for Low and High Peak Power Applications  

Microsoft Academic Search

Two different duplexers have been conceived, designed and tested that allow for using an Impulse UWB Radar in a monostatic\\u000a configuration. The first one, which is based on a fast GaAs SPDT switch, is usable with a low peak power transmitter (<100\\u000a mW), while the second one, completely passive, is intended for high peak power applications (up to 50 kW).

Marc Piettc

401

Novel wide-slot antenna fed by equiangular spiral for ultra-wideband communications  

Microsoft Academic Search

In this paper, a novel UWB (Ultra-wide Band) antenna is proposed. This design mainly consists of a wide slot square ground plane and a frequency independent feed line-a 0.5 turn equiangular spiral, which are etched on each side of a substrate separately. Additionally, a circular patch connected with the slotted ground is introduced to tune the working bandwidth of this

J.-X. Huang; F.-S. Zhang; Q. Zhang; Y.-F. Xu; Y.-B. Yang; Y.-C. Jiao

2010-01-01

402

WideMac: a low power and routing friendly MAC protocol for Ultra Wideband sensor networks  

Microsoft Academic Search

This paper introduces WideMac, a novel low power medium access control protocol designed specifically for Ultra Wide Band Impulse Radio transceivers. The UWB-IR channel offers ultra low power transmissions and unmatchable robustness to multiple access interference. WideMac takes advantage of these two key properties by using asynchronous periodic beacon transmissions from each network node, thereby avoiding the need for network-wide

Jérôme Rousselot; Amre El-Hoiydi; Jean-Dominique Decotignie

2008-01-01

403

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.

Choliz, Juan; Hernandez, Angela; Valdovinos, Antonio

2011-01-01

404

A 3–5GHz UWB Front-End for Low-Data Rate WPANs in 90-nm CMOS  

Microsoft Academic Search

A 3-5-GHz ultra-wideband front-end for low-data rate wireless personal area networks is presented in this paper. The circuit, fabricated in a 90-nm CMOS technology, includes a Gaussian-envelope carrier-based transmitter, a direct-conversion down-converter, and an LO frequency synthesizer. A highly accurate Gaussian pulse shape is achieved by using a nonlinear pulse-forming approach, which provides a spectral efficiency of 38%. Moreover, a

Marco Cavallaro; Giuseppina Sapone; Guido Giarrizzo; Alessandro Italia; Giuseppe Palmisano

2010-01-01

405

Design, Investigation and Measurement of A Compact Ultra Wideband Antenna for Portable Applications  

NASA Astrophysics Data System (ADS)

The design of a printed compact planar antenna of asymmetrical structure with ultra wide bandwidth is described and investigated in this paper. The antenna provides more than 114% impedance bandwidth below VSWR 2 (from 3.3 to more than 12 GHz) with a center frequency of 7.65 GHz; thus it covers the bandwidth requirement for portable UWB wireless device applications. The structure of the asymmetric proposed antenna is very simple and composed of a small hexagonal shaped patch with two asymmetrical coplanar ground planes. It occupies an area of only 20 × 24.5 mm2 when printed on one side of an FR4 substrate with a thickness of 1.6 mm.

Mobashsher, Ahmed Toaha; Islam, Mohammad Tariqul

2013-08-01

406

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

Niemela, Ville; Hamalainen, Matti; Iinatti, Jari

2013-07-01

407

A fully-integrated linearized CMOS distributed amplifier based on Multi-Tanh principle for radio over fiber and ultra-wideband applications  

Microsoft Academic Search

The design of a linearized fully-integrated CMOS distributed amplifier with broadband distortion cancellation capability for ultra-wideband applications is presented. Measured linearized CMOS DA results showed that by reducing the IMD3 products of the linearized DA improves the IIP3 DA linearity which can lead to 5 dB improvement in the linearized DA C\\/IM3 power ratio. The linearized CMOS DA provides 7

Ziad El-Khatib; Leonard MacEachern; Samy A. Mahmoud

2009-01-01

408

The determination of the ultra-wideband and time-domain behavior of open area test sites using frequency domain measurements and the complex antenna factor concept  

Microsoft Academic Search

The ultra-wideband and time-domain characteristics of representative Open Area Test Sites (OATS) are determined numerically and experimentally. The analysis and measurements are performed in the frequency domain over a very wide bandwidth (several decades) using a set of calculable biconical antenna with known complex antenna factors (CAFs) according to S. Ishigami et al. (1996) and J. McLean et al. (2002).

James McLean; Robert Sutton

2003-01-01

409

Comprehensive model-based error analysis of multiple concurrent, time-interleaved, and hybrid ultra-wideband analogue-to-digital conversion  

Microsoft Academic Search

In this paper, a comprehensive parametric error model of ultra-wideband analogue- to-digital conversion (ADC) is developed, which can likewise be applied for single ultra-fast ADC, multiple concurrent ADC (MC-ADC), time-interleaved ADC (TI- ADC) and hybrid ADC (H-ADC) as a combination of TI- and MC-ADC. The error model comprises quantisation, overo w saturation, DC-oset, gain error, time de- lay, and time

Heiko Kopmann

2004-01-01

410

Ultra-Wideband Ultra-Low-DC-Power High Gain Differential-Input Low Noise Amplifier MMIC Using InAs\\/AlSb HEMT  

Microsoft Academic Search

This paper reports an ultra-wideband ultra-low-DC power high gain MMIC low noise amplifier (LNA) with differential RF input using 0.1-mum gate length InAs\\/AlSb metamorphic HEMTs, fabricated and characterized on a GaAs substrate. For testing purpose and for generating a differential RF input, a 3-12 GHz wideband on-chip MMIC balun is connected to the differential input. Even with the loss of

Bob Y. Ma; Joshua Bergman; Peter S. Chen; Jonathan B. Hacker; Gerard Sullivan; Bobby Brar

2007-01-01

411

Research of deformation of the fine phase structure of ultra wideband radar signals when passing through the system of identical selective filters  

Microsoft Academic Search

There has been found the exact solution to the response of the system of selective filters to a noise-like ultra wideband radar signal. The expressions were found for two forms of the enveloping curves of certain discretes of a pseudorandom sequence with phase-shift keying, i.e. the square and sinus-quadratic ones. In order to get the solutions with the accuracy up

I. D. Zolotaryov; Ya. E. Miller; T. O. Pozharsky

2005-01-01

412

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

2010-11-03

413

Multiple-Antenna Receiving and Frequency Domain Equalization in Transmitted-Reference UWB Systems  

NASA Astrophysics Data System (ADS)

A multiple-antenna receiving and combining scheme is proposed for high-data-rate transmitted-reference (TR) Ultra-Wideband (UWB) systems. The nonlinearity of the inter-symbol interference (IST) model is alleviated via simple antenna combining. Under the simplified ISI model, frequency domain equalization (FDE) is adopted and greatly reduces the complexity of the equalizer. A simple estimation algorithm for the simplified ISI model is presented. Simulation results demonstrate that compared to the single receive antenna scheme, the proposed method can obtain a significant diversity gain and eliminate the BER floor effect. Moreover, compared to the complex second-order time domain equalizer, FDE showed better performance robustness in the case of imperfect model estimation.

Liao, Xuewen; Zhu, Shihua; Zeng, Erlin

414

A novel chaos-based UWB sensor for enhancing homeland security  

NASA Astrophysics Data System (ADS)

In this paper, we propose a novel chaos based ultra-wideband (UWB) sensor to enhance homeland security applications. The proposed chaos based modulation has a good resolution when used for wall penetrating applications. The receiver exploits the deterministic nature of chaos to cancel room reverberations avoiding complex synchronization procedure. Numerical electromagnetic (EM) simulations using finite difference time domain (FDTD) method are performed to illustrate the imaging performance of the proposed radar under real life surveillance situations with hidden and moving targets. The simulations are also employed to analyze the extent of penetrating ability of the proposed scheme for different structures. The effect of various structures and thickness on the detection performance are also commented upon.

Venkatasubramanian, Vijayaraghavan; Leung, Henry

2005-05-01

415

A novel through-wall respiration detection algorithm using UWB radar.  

PubMed

Through-wall respiration detection using Ultra-wideband (UWB) impulse radar can be applied to the post-disaster rescue, e.g., searching living persons trapped in ruined buildings after an earthquake. Since strong interference signals always exist in the real-life scenarios, such as static clutter, noise, etc., while the respiratory signal is very weak, the signal to noise and clutter ratio (SNCR) is quite low. Therefore, through-wall respiration detection using UWB impulse radar under low SNCR is a challenging work in the research field of searching survivors after disaster. In this paper, an improved UWB respiratory signal model is built up based on an even power of cosine function for the first time. This model is used to reveal the harmonic structure of respiratory signal, based on which a novel high-performance respiration detection algorithm is proposed. This novel algorithm is assessed by experimental verification and simulation and shows about a 1.5dB improvement of SNR and SNCR. PMID:24109862

Li, Xin; Qiao, Dengyu; Li, Ye; Dai, Huhe

2013-07-01

416

Compact and portable, repetitive high peak power generator for an ultra-wideband source  

Microsoft Academic Search

The development of an autonomous, repetitive, pulsed power generator is presented. This work is a coordinate effort between CEA, Pau University and Technix to develop a tightly integrated unit, including a battery pack, an intermediate dc\\/dc converter, a high voltage dc\\/dc converter, the control system and a high PRF Marx generator. Pau University has designed the Marx generator. They have

B. Cassany; B. Cadilhon; P. Modin; L. Pecastaing; M. Rivaletto; A. Silvestre de Ferron

2010-01-01

417

Ultra-wideband tunable resonator based on varactor-loaded complementary split-ring resonators on a substrate-integrated waveguide for microwave sensor applications.  

PubMed

This paper presents the modeling, design, fabrication, and measurement of an ultra-wideband tunable twoport resonator in which the substrate-integrated waveguide, complementary split-ring resonators (CSRRs), and varactors are embedded on the same planar platform. The tuning of the passband frequency is generated by a simple single dc voltage of 0 to 36 V, which is applied to each varactor on the CSRRs. Different capacitance values and resonant frequencies are produced while a nearly constant absolute bandwidth is maintained. The resonant frequency is varied between 0.83 and 1.58 GHz and has a wide tuning ratio of 90%. PMID:23549526

Sam, Somarith; Lim, Sungjoon

2013-04-01

418

Enhanced PHY symbol structure based on the IEEE 802.15.4a standardization and orthogonal pulses for 3D positioning  

NASA Astrophysics Data System (ADS)

According to IEEE 802.15.4a standardization, an ultra wideband PHY symbol is capable of carrying two bits of information and only one pulse shall be transmitted in each symbol. To prevent inter symbol interference caused by multipath effect, the guard interval is present between the possible burst positions. In order to make full use of the symbol for estimating the azimuth and the elevation of target, we can add additional information at the guard interval position, if the pulse used at the possible burst position is different from the pulse used at the guard interval position. Using the orthonormality between the multiple pulses, furthermore, inter symbol interference can be avoided at the correlation receiver. In this paper, as the first step for estimating the azimuth and the elevation information, we propose a novel PHY symbol structure for IR-UWB system based on IEEE 802.15.4a standardization and orthogonal pulses to enhance the data rates without the bit-error-rate (BER) performance degradation. In the proposed scheme, the pulse used at the possible burst position is the modified hermite polynomial (MHP) pulse of order n equal to 3 and the pulse used at guard interval position is the MHP pulse of order n equal to 4. The performance of the proposed structure is evaluated by computer simulations over the IEEE 802.15.4a channel model. Simulation results show that the proposed symbol structure with orthogonal pulses can double the data rates of the systems without BER performance degradation. [Figure not available: see fulltext.

Jing, Changqiang; Jeon, Inho; Kim, Youngok

2011-12-01

419

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

420

Experimental study on human being detection using UWB radar  

Microsoft Academic Search

In this paper we are evaluating the feasibility of using an UWB radar as a victim search device in emergency situations. The idea of human being detection using UWB radar is to observe periodic differences in time-of-arrival of scattered pulses from the victim, which are result of periodic movements of the chest area of the victim. This motion cannot be

Amer Nezirovic; Alexander G. Yarovoy; Leo P. Ligthart

2006-01-01

421

Performance analysis of UWB impulse radar using parallel IPCP receiver  

Microsoft Academic Search

UWB impulse radar has high accuracy of measurement because it uses a transmitted signal whose pulse length is below some nanosecond. In this paper, we propose two novel inter-period correlation processing (IPCP) receivers for UWB impulse radar. The conventional IPCP receiver uses the signal periodicity of signals, so it avoids estimation of unknown parameters determined by the targets and propagation.

Hiroyuki Hatano; Hiraku Okada; Takaya Yamazato; Masaaki Katayama

2004-01-01

422

An ultra-wideband tunable multi-wavelength Brillouin fibre laser based on a semiconductor optical amplifier and dispersion compensating fibre in a linear cavity configuration  

NASA Astrophysics Data System (ADS)

A multi-wavelength Brillouin fibre laser (MBFL) with an ultra-wideband tuning range from 1420 nm to 1620 nm is demonstrated. The MBFL uses an ultra-wideband semiconductor optical amplifier (SOA) and a dispersion compensating fibre (DCF) as the linear gain medium and nonlinear gain medium, respectively. The proposed MBFL has a wide tuning range covering the short (S-), conventional (C-) and long (L-) bands with a wavelength spacing of 0.08 nm, making it highly suitable for DWDM system applications. The output power of the observed Brillouin Stokes ranges approximately from —5.94 dBm to —0.41 dBm for the S-band, from —4.34 dBm to 0.02 dBm for the C-band and from —2.19 dBm to 0.39 dBm for the L-band. The spacing between each adjacent wavelengths of all the three bands is about 0.08 nm, which is approximately 10.7 GHz for the frequency domain.

Zulkifli, M. Z.; Ahmad, H.; Hassan, N. A.; Jemangin, M. H.; Harun, S. W.

2011-07-01

423

An ultra-wideband tunable multi-wavelength Brillouin fibre laser based on a semiconductor optical amplifier and dispersion compensating fibre in a linear cavity configuration  

SciTech Connect

A multi-wavelength Brillouin fibre laser (MBFL) with an ultra-wideband tuning range from 1420 nm to 1620 nm is demonstrated. The MBFL uses an ultra-wideband semiconductor optical amplifier (SOA) and a dispersion compensating fibre (DCF) as the linear gain medium and nonlinear gain medium, respectively. The proposed MBFL has a wide tuning range covering the short (S-), conventional (C-) and long (L-) bands with a wavelength spacing of 0.08 nm, making it highly suitable for DWDM system applications. The output power of the observed Brillouin Stokes ranges approximately from -5.94 dBm to -0.41 dBm for the S-band, from -4.34 dBm to 0.02 dBm for the C-band and from -2.19 dBm to 0.39 dBm for the L-band. The spacing between each adjacent wavelengths of all the three bands is about 0.08 nm, which is approximately 10.7 GHz for the frequency domain. (lasers)

Zulkifli, M Z; Ahmad, H; Hassan, N A; Jemangin, M H; Harun, S W

2011-07-31

424

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

425

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

2013-09-19

426

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

427

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 3.1–10.6?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.

Xu, Ziqiang

2013-01-01

428

SA and SAR Analysis for Wearable UWB Body Area Applications  

NASA Astrophysics Data System (ADS)

With the rapid progress of electronic and information technology, an expectation for the realization of body area network (BAN) by means of ultra wide band (UWB) techniques has risen. Although the signal from a single UWB device is very low, the energy absorption may increase significantly when many UWB devices are simultaneously adorned to a human body. An analysis method is therefore required from the point of view of biological safety evaluation. In this study, two approaches, one is in the time domain and the other is in the frequency domain, are proposed for the specific energy absorption (SA) and the specific absorption rate (SAR) calculation. It is shown that the two approaches have the same accuracy but the time-domain approach is more straightforward in the numerical analysis. By using the time-domain approach, SA and SAR calculation results are given for multiple UWB pulse exposure to an anatomical human body model under the Federal Communications Commission (FCC) UWB limit.

Wang, Qiong; Wang, Jianqing

429

UWB radars in medicine  

Microsoft Academic Search

Applied research on biomedical applications of UWB radar is targeted to the identification of the possible new devices made possible by the technology, to the design and development of those devices, and to the clinical testing of the systems obtained. Applications can be divided into two main sectors according to the frequency range used. For the conventional UWB radar microwave

Enrico M. Staderini

2002-01-01

430

Cost-minimized 24 GHz pulse oscillator for short-range automotive radar applications  

Microsoft Academic Search

This paper reports on the design of ultra-wideband 24 GHz pulse oscillators developed for automotive radar applications. Due to system considerations (range resolution, dynamic range), such oscillator modules need to generate ultra-short coherent pulses. Measurement results of prototype oscillators demonstrate +5 dBm peak output power, less than 1 ns pulse width and excellent coherency. The oscillators were applied in a

Andriy Kryshtopin; Georgiy Sevskiy; Konstantin Markov; P. Heide; Martin Nalezinski; Richard Roskosch; Martin Vossiek

2003-01-01

431

A new communication system design of M-ary PPM UWB suitable to FCC signal spectrum  

NASA Astrophysics Data System (ADS)

UWB impulse radio signals have a very short duration, extremely wide bandwidth and share the same frequency spectrum with other existing systems. It was determined by the Federal Communications Commission (FCC) that UWB systems could cause interference with other systems, such as Global Positioning System (GPS) for example. Therefore, at present, the FCC has restricted the use of UWB systems to frequencies above 3.1 GHz. In this paper, we evaluated performance of UWB system using proposed pulses that are strictly limited in time to remove interference while, at the same time, contain their power distribution to a frequency band from 3.1 GHz to 10.6 GHz. In particular, we evaluated the BER Performance in relation to system parameters such as pulse duration, ?, the number of users, Nu, and the number of symbols, M. We found the optimal pulse duration ? through computer simulation using developed UWB pulses. It is shown that performance evaluation between the UWB communication system using these UWB pulses and the Gaussian monocycle pulse in M-ary PPM and BPSK schemes. These results can be contributed to construct M-ary PPM UWB communication system in terms of multiuser parameters and pulse duration.

Lee, Mike M.; Cho, Byung-Lok; Kim, Dae-Ik

2004-03-01

432

UWB Vivaldi antenna for impulse radio beamforming  

Microsoft Academic Search

In this paper, two different types of Vivaldi antenna are designed and tested suitable for electromagnetic beamforming. The first is an antipodal Vivaldi antenna, while the other is a tapered slot Vivaldi antenna. They are both ultra wideband antennas for the 1 GHz to 5 GHz frequency band. They have low impulse distortion and the voltage standing wave ratio (VSWR)

Tuan Anh Vu; Malihe Zarre Dooghabadi; Shanthi Sudalaiyandi; H. A. Hjortland; O. Naess; Tor Sverre Lande; S. E. Hamran

2009-01-01

433

A Low-Cost and Energy-Efficient Multiprocessor System-on-Chip for UWB MAC Layer  

NASA Astrophysics Data System (ADS)

Ultra-wideband (UWB) technology has attracted much attention recently due to its high data rate and low emission power. Its media access control (MAC) protocol, WiMedia MAC, promises a lot of facilities for high-speed and high-quality wireless communication. However, these benefits in turn involve a large amount of computational load, which challenges the traditional uniprocessor architecture based implementation method to provide the required performance. However, the constrained cost and power budget, on the other hand, makes using commercial multiprocessor solutions unrealistic. In this paper, a low-cost and energy-efficient multiprocessor system-on-chip (MPSoC), which tackles at once the aspects of system design, software migration and hardware architecture, is presented for the implementation of UWB MAC layer. Experimental results show that the proposed MPSoC, based on four simple RISC processors and shared-memory infrastructure, achieves up to 45% performance improvement and 65% power saving, but takes 15% less area than the uniprocessor implementation.

Xiao, Hao; Isshiki, Tsuyoshi; Khan, Arif Ullah; Li, Dongju; Kunieda, Hiroaki; Nakase, Yuko; Kimura, Sadahiro

434

Hardware Implementation of a Genetic Algorithm Based Canonical Singed Digit Multiplierless Fast Fourier Transform Processor for Multiband Orthogonal Frequency Division Multiplexing Ultra Wideband Applications  

Microsoft Academic Search

Problem statement: Ultra Wide Band (UWB) technology has attracted many researchers' attention due to its advantages and its great poten tial for future applications. The physical layer standard of Multi-band Orthogonal Frequency Division Multiplexing (MB-OFDM) UWB system is defined by ECMA International. In this standard, th e data sampling rate from the analog-to-digital converter to the physical layer is up

Mahmud Benhamid; Masuri Bin Othman

2009-01-01

435

A 70–280 MHz frequency and Q tunable 53 dB SFDR GmC filter for ultra-wideband  

Microsoft Academic Search

A 70-280 MHz 5th-order Chebyshev Gm-C low-pass filter was implemented in 0.13?m CMOS process to support both WiMedia UWB and lower rate IR-UWB applications. The filter response is accurately maintained over 4× frequency range by using unit Gm cell arrays and independent Q tuning circuit. To improve linearity of Gm-C filter in low supply voltage, a modified LC ladder topology

Weinan Li; Yumei Huang; Zhiliang Hong

2010-01-01

436

UWB Antennas and Their Applications  

Microsoft Academic Search

The UWB antennas are proposed for applications of communication systems, various kinds of antenna test ranges, and high resolution microwave imaging. The narrower instantaneous bandwidth of UWB antennas will degrade the performance of the above applications. By using different characteristic of geometries, structures and sizes, good impedance bandwidth and instantaneous bandwidth can be achieved for these UWB antennas. In this

Dau-Chyrh Chang

2008-01-01

437

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

PubMed

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

Yin, Zhendong; Liu, Xiaohui; Wu, Zhilu

2013-07-31

438

A remotely UHF powered UWB transmitter for high precision localization of RFID tag  

Microsoft Academic Search

The design of a remotely UHF powered UWB transmitter is presented in 0.13µm CMOS standard process. Power harvesting unit is based on a Dickson voltage multiplier and UWB pulse generator uses filtered combined edge method. Multi-Vt technique and CMOS logic allows pulse generator power consumption between two consecutive pulses to be reduced enough to be remotely powered. It achieves FCC

R. Vauche; E. Bergeret; J. Gaubert; S. Bourdel; O. Fourquin; N. Dehaese

2011-01-01

439

A Double Stage IPCP Detector for UWB Radars  

Microsoft Academic Search

Among ultra wide band (UWB) detectors have been introduced yet, single pulse detectors don't have good performance as two or multiple pulses detectors. Multiple pulses and multi-channel detectors increase calculation load and need faster processors than single or double-pulse detectors. Since they don't have equal detection performance for different number of target bright points, they are used in multi-channel architecture.

M. Ghahramani; R. Mohseni; A. Sheikhi

2007-01-01

440

Tightly coupled UWB\\/IMU pose estimation  

Microsoft Academic Search

In this paper we propose a 6DOF tracking system combining Ultra-Wideband measurements with low-cost MEMS inertial measurements. A tightly coupled system is developed which estimates position as well as orientation of the sensor-unit while being reliable in case of multipath effects and NLOS conditions. The experimental results show robust and continuous tracking in a realistic indoor positioning scenario.

Jeroen D. Hol; Fred Dijkstra; Henk Luinge; T. B. Schon

2009-01-01

441

UWB interference to narrowband receivers  

Microsoft Academic Search

This paper studies the in-band interference of timehopping spread spectrum (TH-SS) UWB signals to narrow band receivers. Based on the analysis of general power spectral density (PSD) of TH-SS UWB signal, the interference of UWB signal can be partitioned into two parts: (1) additive white Gaussian noise interference (2) jamming tone interference. Following this framework, a novel analytical symbol error

Dongsong Zeng; Amir I. Zaghloul; A. Annamalai; E. F. C. Laberge

2006-01-01

442

A high band impulse radio UWB transmitter for communication and localization  

Microsoft Academic Search

This paper describes a monolithic integrated transmitter intended for impulse radio (IR) Ultra-wide band (UWB) applications including indoor communication and indoor localization. The transmitter operates in the higher UWB band centered at 7.68 GHz and it is optimized for a pulse bandwidth of about 1.5 GHz. The transmitter generates single pulses with a repetition rate of 60 MHz and utilizes

Denys Martynenko; Gunter Fischer; Oleksiy Klymenko

2009-01-01

443

A study on fast imaging for walking human bodies by UWB radar with realistic model  

Microsoft Academic Search

UWB(Ultra Wide-Band) pulse radar is a promising candidate for surveillance systems used to prevent crimes and terror. The high-speed SEABED (Shape Estimation Algorithm based on BST and Extraction of Directly scattered waves) imaging algorithm, is deployed to apply UWB pulse radar in fields that require realtime operations. The SEABED algorithm assumes that omni-directional antennas are scanned to observe the scattered

Takuya Sakamoto; Toru Sato

2008-01-01

444

UWB channel estimation using new generating TR transceivers  

SciTech Connect

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

445

UWB Radar Calibration Using Wiener Filters for Spike Reduction  

Microsoft Academic Search

Ultra wide band (UWB) radar systems are used to get information from a detected target. This can be done by studying the shapes of incident and reflected pulses. To evaluate the target transfer function, a calibration is necessary to eliminate the influences of the system and the environment. The calibration includes deconvolution operations producing spike artifacts. In this paper a

Sebastian Hantscher; Bernhard Etzlinger; Alexander Reisenzahn; C. G. Diskus

2006-01-01

446

A 1.2-V, 5.8mW, Ultra-Wideband Folded Mixer in 0.13-?m CMOS  

Microsoft Academic Search

This paper presents the design and analysis of a low-voltage downconversion mixer in 0.13-mum CMOS for UWB applications between 3-7 GHz. To facilitate low-voltage operation with 0.8-1.2-V supply, the mixer employs a folded Gilbert cell topology with PMOS devices for LO switches and utilizes on-chip broadband RF chokes for biasing. The folded toplogy allows the transconductance and LO stages to

Kihwa Choi; Dong Hun Shin; C. Patrick Yue

2007-01-01

447

Microwave photonic signal processing techniques and radio-over-fiber transmission demonstration  

Microsoft Academic Search

Radio-over-fiber (RoF) utilizing microwave photonic signal processing techniques is a powerful solution for the future super-broadband wireless access. In this paper, we review our recent works on photonic processing techniques of microwave signals for RoF applications and experimental demonstration of RoF transmissions. Our works specifically focus on impulse-response ultra-wideband (IR-UWB) pulse generation for UWB-over-fiber systems, photonic vector modulation, novel analog

Kun XU; Jian-qiang LI; Jie YIN; Ye ZHANG; Hao HUANG; Jin-tong LIN

2009-01-01

448

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

Code of Federal Regulations, 2010 CFR

...FREQUENCY DEVICES Ultra-Wideband Operation ...frequency at which the highest radiated emission...frequency at which the highest radiated emission...employed in the testing. (h) The highest frequency employed...conducted onto the AC power lines....

2009-10-01

449

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

Code of Federal Regulations, 2010 CFR

...FREQUENCY DEVICES Ultra-Wideband Operation ...frequency at which the highest radiated emission...frequency at which the highest radiated emission...employed in the testing. (h) The highest frequency employed...conducted onto the AC power lines....

2010-10-01

450

A short-range UWB impulse-radio CMOS sensor for human feature detection  

Microsoft Academic Search

,Ultra-WideBand (UWB) Impulse-Radio (IR) radar offers high-resolution ranging in dynamic environments without requiring LOS. The scattering pattern of UWB pulses from a time-varying environment (e.g., moving human) is quite sensitive allowing for high-fidelity detection (Fig. 16.9.1) [3]. In order to acquire the maximum information from the environment and its objects, the scattered waveform should be completely reconstructed. Direct sampling of

Ta-Shun Chu; Jonathan Roderick; SangHyun Chang; Timothy Mercer; Chenliang Du; Hossein Hashemi

2011-01-01

451

A RF receiver frontend for SC-UWB in a 0.18-?m CMOS process  

NASA Astrophysics Data System (ADS)

A radio frequency (RF) receiver frontend for single-carrier ultra-wideband (SC-UWB) is presented. The front end employs direct-conversion architecture, and consists of a differential low noise amplifier (LNA), a quadrature mixer, and two intermediate frequency (IF) amplifiers. The proposed LNA employs source inductively degenerated topology. First, the expression of input impedance matching bandwidth in terms of gate-source capacitance, resonant frequency and target S11 is given. Then, a noise figure optimization strategy under gain and power constraints is proposed, with consideration of the integrated gate inductor, the bond-wire inductance, and its variation. The LNA utilizes two stages with different resonant frequencies to acquire flat gain over the 7.1-8.1 GHz frequency band, and has two gain modes to obtain a higher receiver dynamic range. The mixer uses a double balanced Gilbert structure. The front end is fabricated in a TSMC 0.18-?m RF CMOS process and occupies an area of 1.43 mm2. In high and low gain modes, the measured maximum conversion gain are 42 dB and 22 dB, input 1 dB compression points are -40 dBm and -20 dBm, and S11 is better than -18 dB and -14.5 dB. The 3 dB IF bandwidth is more than 500 MHz. The double sideband noise figure is 4.7 dB in high gain mode. The total power consumption is 65 mW from a 1.8 V supply.

Rui, Guo; Haiying, Zhang

2012-12-01

452

UWB radars based on wavelet packet OFDM signals  

Microsoft Academic Search

Multicarrier modulation is a popular technique for ultra wideband signal design in high range resolution radars. Specially, Orthogonal Frequency Division Multiplexing (OFDM) radar signals, because of their prominent properties such as favourable ambiguity function and high spectral efficiency have been recently of interest of many researchers. The main purpose of this paper is to replace the conventional OFDM multi-carrier modulation

R. Mohseni; A. Sheikhi; M. A. Masnadi Shirazi

2008-01-01

453

Physically small and adjustable double-ridged horn antenna for biomedical UWB radar applications  

Microsoft Academic Search

Biomedical applications of ultra-wideband radar promise a very important means to remotely characterise tissues and organs. The acquisition of such physiological signatures requires small and efficient antennas, designed for ultra-wideband frequency operation. We have designed and characterised physically small and adjustable double-ridged horn antennas for frequencies from 1 to 10 GHz. The miniaturisation of the radiating elements was accomplished by

U. Schwarz; M. Helbig; J. Sachs; F. Seifert; R. Stephan; F. Thiel; M. A. Hein

2008-01-01

454

Design and application of dielectrically scaled double-ridged horn antennas for biomedical UWB radar applications  

Microsoft Academic Search

Ultra-wideband sensing begins to play an important role in biomedical diagnostic systems. Promising and relevant applications include remotely monitored vital functions as well as the characterization of tissues and organs. The acquisition of such physiological signatures requires small and radiation-efficient antennas, designed for ultra-wideband frequency operation. We have developed physically small and adjustable double-ridged horn antennas with which we could

U. Schwarz; M. Helbig; J. Sachs; R. Stephan; M. A. Hein

2009-01-01

455

UWB Array-Based Radar for Landmine Detection  

Microsoft Academic Search

In this paper, the development of an UWB array-based time-domain radar sensor is described. The radar sensor is designed to be used within a vehicle-mounted multi-sensor system for humanitarian demining. The main novelty of the radar lies in the modular approach, design of the antenna system and waveform of the transmit antenna feeding pulse. The radar has focusing capability via

Alexander Yarovoy; Pascal Aubry; Pidio Lys; Leo Ligthart

2006-01-01

456

Hybrid Radio over Fiber System for Generation and Distribution of UWB Signals  

Microsoft Academic Search

The authors investigate a hybrid radio over fiber system for the generation and distribution of UWB signals. This system is based on gain-switched laser, which is used to generate short optical pulses. The position of these pulses is modulated using electrical data before transmitting them to the Remote Antenna Unit (RAU). At the RAU, the optical signal is detected and

A. Kaszubowska-Anandarajah; P. Perry; L. P. Barry

2009-01-01

457

Hybrid radio over fiber system for generation and distribution of UWB signals  

Microsoft Academic Search

The authors investigate a hybrid radio over fiber system for the generation and distribution of UWB signals. This system is based on gain-switched laser, which is used to generate short optical pulses. The position of these pulses is modulated using electrical data before transmitting them to the remote antenna unit (RAU). At the RAU, the optical signal is detected and

A. Kaszubowska-Anandarajah; P. Perry; L. P. Barry

2008-01-01

458

An ultrawideband radar based pulse sensor for arterial stiffness measurement.  

PubMed

A novel pulse sensor based on ultrawideband (UWB) radar to detect the arterial vessel movements on various sites on human body without applying external pressure on the arterial vessel was designed and evaluated for aortic stiffness measurement. The UWB pulse sensor was evaluated for its functional performance and human study was carried out to validate the UWB sensor as a tool for clinical screening of subjects with cardiovascular risks. Good agreement in measurement of pulse wave velocity, an index of arterial distensibility, was achieved between the UWB pulse sensor and the applanation tonometer. PMID:18002297

Tao, Teh-Ho; Hu, Shin-Jen; Peng, Jla-Hung; Kuo, Su-Chen

2007-01-01

459

UWB radar for patient monitoring  

Microsoft Academic Search

During the last few years the Moscow Aviation Institute (Russia) and the Industrial Technology Research Institute (Taiwan) have worked jointly on the development of ultrawideband (UWB) medical radars for remote and contactiess monitoring of patients in hospitals. Preliminary results of these works were published in [1]. As of the present, several radars have been produced and tested in real conditions

Igor Immoreev; Teh-Ho Tao

2008-01-01

460

Inkjet printing of UWB antennas on paper based substrates  

Microsoft Academic Search

For the first time, we demonstrate the feasibility of realizing ultra-wideband antennas through ink-jetting of conductive inks on commercially available paper sheets (paper as an RF substrate). The characterization of the conductive ink as well as of the electrical properties of the paper substrate is reported for frequencies up to 10GHz. This work is one step further towards the development

G. Shaker; A. Rida; S. Safavi-Naeini; M. M. Tentzeris; S. Nikolaou

2011-01-01

461

Narrowband Interference Avoidance in OFDM-Based UWB Communication Systems  

Microsoft Academic Search

In this letter we present a new method for mitigating narrowband interference in orthogonal frequency-division multiplexing-based ultra-wideband communication systems. The proposed narrowband interference avoidance (NBIA) method performs spectral shaping of the transmitted signal using binary signature sequences with minimum total squared correlation (TSC) to avoid the narrowband interfering signal. We illustrate the proposed method with plots that show the spectrum

Dimitrie C. Popescu; Prasad Yaddanapudi

2007-01-01

462

Further Developments in High-Voltage UWB Directional Couplers  

Microsoft Academic Search

We continue here the development of high-voltage Ultra-Wideband coupled-line directional couplers that we began in a previous note. We investigate smoothing the impedance profile, increasing the isolation, and reducing the transmission loss, while maintaining high voltage standoff. We develop a number of new prototypes, including medium-voltage designs filled with air, and higher voltage designs filled with oil. First, we experiment

Lanney M. Atchley; Leland H. Bowen; Everett G. Farr; Donald E. Ellibee; William D. Prather

463

2Dimensional Imaging of Human Bodies with UWB Radar Using Approximately Uniform Walking Motion along a Straight Line with the SEABED Algorithm  

Microsoft Academic Search

SUMMARY UWB (Ultra Wide-Band) pulse radar is a promising candi- date for surveillance systems designed to prevent crimes and terror-related activities. The high-speed SEABED (Shape Estimation Algorithm based on BST and Extraction of Directly scattered waves) imaging algorithm, is used in the application of UWB pulse radar in fields that require real- time operations. The SEABED algorithm assumes that omni-directional

Takuya Sakamoto; Toru Sato

2008-01-01

464

Chaos UWB radar for through-the-wall imaging.  

PubMed

In this paper, we propose to apply a novel chaos-based ultra-wide band (UWB) radar for through-the-wall imaging. The proposed chaos modulation offers superior resolution compared to conventional UWB radars when applied for through-the-wall imaging. A noncoherent receiver is designed based on expectation maximization (EM) algorithm. The theoretical detection performance is derived for through-the-wall detection in the presence and absence of room reverberations as a function of dielectric properties of walls, targets, and their geometry illustrating the robustness of the proposed modulation against room reverberations. The resolution of the proposed modulation is analyzed theoretically and verified through simulations for different wall materials. Numerical electromagnetic simulations using finite difference time domain (FDTD) method are performed to confirm the obtained theoretical results. From the theoretical and simulation analysis, we find that the proposed chaos-based pulse amplitude modulated ultra-wide band (CPAM-UWB) radar has better detection performance, penetrating ability and imaging performance compared to other conventional through-the-wall imaging radars. PMID:19403365

Venkatasubramanian, Vijayaraghavan; Leung, Henry; Liu, Xiaoxiang

2009-04-28

465

Ultrawideband (UWB) impulse signal detection and processing issues  

Microsoft Academic Search

The author considers the detection, collection, and analysis of impulse-like time domain signals which meet the ultrawideband (UWB) definition. First, UWB impulse signal technical terminology and foreign work are reviewed. The fundamental collection differences between narrowband (sinusoid) and UWB (impulse-like) signals are discussed, and a comparison of the minimum detectable signal for the narrowband and UWB transient signals is presented.

Elizabeth C. Kisenwether

1992-01-01

466

A High-Resolution Imaging Algorithm without Derivatives Based on Waveform Estimation for UWB Radars  

Microsoft Academic Search

SUMMARY UWB pulse radars enable us to measure a target location with high range-resolution, and so are applicable for measurement systems for robots and automobile. We have already proposed a robust and fast imaging algorithm with an envelope of circles, which is suitable for these applications. In this method, we determine time delays from received sig- nals with the matched

Shouhei Kidera; Takuya Sakamoto; Toru Sato

2007-01-01

467

Enhancing homeland security with advanced UWB sensors  

Microsoft Academic Search

This article discusses recent research into short-range UWB radars that have the potential to create more robust perimeter security sensor systems for exterior installations. It also briefly discusses existing UWB sensors to show how they establish a technical precedent for today's research.

P. Withington; H. Fluhler; Soumya Nag

2003-01-01

468

Generation of Power-Efficient FCC-Compliant UWB Waveforms Using FBGs: Analysis and Experiment  

Microsoft Academic Search

In this paper, we design, analyze, and demonstrate experimentally U.S. Federal Communications Commission (FCC)- compliant power-efficient ultrawideband (UWB) waveforms generated by optical pulse shaping. The time-domain pulse shape is written in the frequency domain, and a single-mode fiber performs the frequency-to-time conversion. The waveform is inscribed in the frequency domain by the fiber Bragg grating (FBG). A significant challenge for

Mohammad Abtahi; Julien Magne; Mehrdad Mirshafiei; Leslie A. Rusch; Sophie Larochelle

2008-01-01

469

UWB Antennas Integration Effects for Wireless Communication Applications  

NASA Astrophysics Data System (ADS)

In this chapter, a return loss measurement campaign was achieved to study the effect of the close environment on antenna's behavior in wireless application scenarios. Five different planar ultra-wideband antennas were measured on different devices (keyboard, screen, Internet box, and two laptops). General similarities in the bandwidth and matching efficiency behaviors were noticed for the antennas when mounted on the same devices in the same positions. In a purpose of modeling, the results can be used to classify the antennas and describe general behaviors on common used devices in wireless applications.

Mellah, M.-A.; Roblin, C.; Sibille, A.

470

Exploitation of Extra Diversity in UWB MB-OFDM System.  

National Technical Information Service (NTIS)

This paper describes and analyzes the performance of MB-OFDM (Multi- Band OFDM) UWB (Ultra-WideBand) system that is suggested as one of standards in IEEE 802.15 TG3a for UWB application. UWB channel model that has been contributed in IEEE 802.15 SG3a is a...

J. Heo K. Chang

2005-01-01

471

Verification of Secret Key Generation from UWB Channel Observations  

Microsoft Academic Search

Theoretical models of ultrawideband (UWB) radio channels indicate that pairs of UWB radio transceivers measure their common radio channel with a high degree of agreement and third parties are not be able to accurately estimate the state of the common channels. These properties allow generation of secret keys to support secure communications from UWB channels measurements. In this paper, the

Masoud Ghoreishi Madiseh; Shuai He; Michael L. McGuire; Stephen W. Neville; Xiaodai Dong

2009-01-01

472

Capacity analysis of UWB systems with transmitter power constraints  

Microsoft Academic Search

Ultra wide bandwidth (UWB) wireless technology plays a key role in future beyond third generation systems guaranteeing very high bit rates availability, low power consumption, low costs and location capabilities. The peaceful acceptance of the UWB technology worldwide is mainly related to coexistence issues with other existing (and future) narrowband and wideband systems sharing the spectrum with UWB. This led

Romeo Giuliano; Franco Mazzenga

2005-01-01

473

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

474

ULTRA WIDEBAND FRACTAL MICROSTRIP ANTENNA DESIGN  

Microsoft Academic Search

Abstract—Newfractal 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

475

Low-power clock and data recovery circuit for IR-UWB receiver power management  

Microsoft Academic Search

A low power clock and data recovery (CDR) for low data rate applications is presented. The CDR circuit, implemented as a phase locked-loop (PLL), deals with very narrow pulses from an energy detector in a non-coherent Impulse Radio based Ultra Wide Band (IR-UWB) receiver. To considerably reduce the power consumption of such a receiver, the proposed circuit is intended to

N. Tall; N. Dehaese; S. Bourdel; O. Fourquin; R. Vauche; J. Gaubert

2012-01-01

476

UWB radar for human being detection  

Microsoft Academic Search

UWB radar for detection and positioning of human beings in complex environment has been developed and manufactured. Novelty of the radar lies in its large operational bandwidth (11.7 GHz at -10 dB level) combined with high time stability. Detection of respiratory movement of a person in laboratory conditions has been demonstrated. Based on experimental results human being radar return has

A. G. Yarovoy; J. Matuzas; B. Levitas; L. P. Ligthart

2005-01-01

477

UWB Radar for Human Being Detection  

Microsoft Academic Search

UWB radar for detection and positioning of human beings in complex environment has been developed and manufactured. Novelty of the radar lies in its large operational bandwidth (11.7 GHz at -10 dB level) combined with high time stability. Detection of respiratory movement of a person in laboratory conditions has been demonstrated. Based on experimental results human being radar return has

A. G. Yarovoy; L. P. Ligthart; J. Matuzas; B. Levitas

2006-01-01

478

Design and Implementation of Energy-Collection-Based Low Complexity IR-UWB Receiver  

NASA Astrophysics Data System (ADS)

In this paper, an energy-collection-based non-coherent IR-UWB receiver allowing low complexity and low power consumption is proposed for short range data communication. The proposed receiver consists of an on-the-fly integrator, a 1-bit digital sampler, a pre-processor and a digital symbol synchronizer. The on-the-fly integrator for energy collection and the 1-bit digital sampler reduce complexity of IR-UWB system. Furthermore, with a simple digital filter in the pre-processing unit, SNR and robustness of the receiver against time-varying channel are enhanced. Also the receiver complexity is diminished by a simple scheme of symbol synchronization based on rough time information about incoming pulses, not requiring exact timing information. The performance of the proposed receiver is simulated based on IEEE 802. 15. 4a channel model and the algorithms are implemented and verified on a FPGA.

Lee, Soon-Woo; Park, Young-Jin; Kim, Kwan-Ho

479

Multiscale energy products for TOA estimation in IR-UWB systems  

Microsoft Academic Search

In this paper, we consider time of arrival estimation of ultra-wideband signals based on low-rate samples that are obtained after a square-law device. Signal conditioning techniques based on a bank of cascaded multi-scale energy collection filters and wavelets are introduced, where correlations across multiple scales are exploited for edge and peak enhancements towards a more accurate detection. The performances of

I. Guvenc; Z. Sahinoglu

2005-01-01

480

A low-power digitally-programmable accurate decibel-linear CMOS VGA for UWB systems  

Microsoft Academic Search

A new current-mode circuit for realizing CMOS digitally controlled decibel-linear variable gain amplifier (VGA) is proposed for ultra-wideband systems. The core block of this VGA is a series of programmable current-amplifier cells which are connected by a switch array. Some cells can be cut off under certain gain modes to save the power. Designed in 0.18..m CMOS technology, the VGA

Bin Jia; Guican Chen; Hong Zhang

2008-01-01

481

UWB Bandpass Filter Using Microstrip-to-CPW Transition With Broadband Balun  

Microsoft Academic Search

A novel ultra-wideband bandpass filter (BPF) is presented using a back-to-back microstrip-to-coplanar waveguide (CPW) transition employed as the broadband balun structure in this letter. The proposed BPF is based on the electromagnetic coupling between open-circuited microstrip line and short-circuited CPW. The equivalent circuit of half of the filter is used to calculate the input impedance. The broadband microstip-to-CPW transition is

Jung-Woo Baik; Tae-Hak Lee; Young-Sik Kim

2007-01-01

482

A WiMedia\\/MBOA-Compliant CMOS RF Transceiver for UWB  

Microsoft Academic Search

A WiMedia\\/MBOA compliant RF transceiver for ultra-wideband data communication in the 3-5-GHz band is presented. The transceiver includes receiver, transmitter and synthesizer is completely integrated in 0.13-mum standard CMOS technology. The receiver uses a feedback-based low-noise amplifier (LNA) to obtain an RF gain of 4 to 37 dB and an overall measured noise figure of 3.6 to 4.1 dB over

Christoph Sandner; Sven Derksen; Dieter Draxelmayr; Staffan Ek; Voicu Filimon; Graham Leach; Stefano Marsili; Denis Matveev; Koen L. R. Mertens; Florian Michl; Hermann Paule; Manfred Punzenberger; Christian Reindl; Raffaele Salerno; Marc Tiebout; Andreas Wiesbauer; Ian Winter; Zisan Zhang

2006-01-01

483

UWB Tomographic Radar Imaging of Penetrable and Impenetrable Objects  

Microsoft Academic Search

In this paper, the capability of ultra-wide-band (UWB) sensor arrays for tomographic radar of electrically large objects is presented. The major concern when imaging is extended to real objects is to achieve a correct reconstruction of the object shape and its electric properties. A general framework based on a UWB bifocusing operator (UWB-BF) with good tomographic imaging capabilities is presented.

LluÍs Jofre; Antoni Broquetas; Jordi Romeu; SebastiÁn Blanch; Anna PapiÓ Toda; Xavier Fabregas; Angel Cardama

2009-01-01

484

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

485

Novel approach of UWB multi-band system based on orthogonal function for transports applications  

NASA Astrophysics Data System (ADS)

Ultra Wide Band (UWB) is based on the transmission of very short pulses with relatively low energy. This technology may see increased use in the wireless communications and sensing application. Having the available bandwidth of 7.5 GHz and the minimum signal bandwidth of 500 MHz, UWB systems can be divided into two groups: impulse communication system and multi-band system. In multi-band, the spectrum is divided into several subbands. In this paper, we propose this technique for subway transport systems; especially for communication between trains or train-infrastructure. So, the main purpose of this paper is to make use of the original mathematical tools called orthogonal functions to allow a multi-user communication system for multi-band UWB transmission. The BER values will be calculated and analyzed using computer simulations in the presence of multi-user interference, in order to evaluate the performances of the proposed system. These BER values will be given for two cases: the users in the same subband and a single user per subband. We will show that the proposed orthogonal waveforms give good performances in terms of BER and are able to reduce multi-user interference. The proposed method has many potentials advantages in terms of complexity and implementation.

Elbahhar, F.; Lamari, A.; Rivenq, A.; Rouvaen, J. M.; Heddebaut, M.; Boukour, T.; Sakkila, L.

2011-03-01

486

UWB radar for ground vehicle self protect  

Microsoft Academic Search

The authors describe the concept of using an impulse ultrawide-band (UWB) radar system to detect, acquire, identify and track incoming armor-piercing rounds which threaten a ground vehicle. Data illustrating the ability of a prototype impulse radar to discriminate between different target shapes are presented. The sensitivity of the CFAR (constant-false-alarm-rate) receiver used with the system appears to be adequate, but

J. W. Toevs; D. R. Smith; D. P. Byrne; G. F. Ross

1992-01-01

487

Radio resource optimization in an UWB wireless access  

Microsoft Academic Search

The Ultra Wide Band (UWB) radio is a promising technology for wireless digital communications. In this paper we present the main principles for the radio resource sharing in UWB. We describe both the theoretical approach and the practical one and we address the procedures of a MAC protocol for the support of Dynamic Bandwidth service class and Reserved one. I.

F. Cuomo; A. Baiocchi; F. Capriotti; C. Martello

2002-01-01

488

Photonic generation of ultrawideband pulse using semiconductor laser with optical feedback.  

PubMed

We propose and demonstrate an approach to the generation of an ultrawideband (UWB) pulse utilizing the nonlinear dynamics of a semiconductor laser (SL). The output UWB chaotic optical pulses generated by the SL with optical feedback can be controlled when the feedback strength and driving current of the SL are tuned. Our experiment proves that the spectrum characteristics of the UWB pulses satisfy Federal Communications Commission regulations, and the experimental results are consistent with the simulated results based on the laser's rate equations. PMID:20517398

Zheng, Jian-Yu; Zhang, Ming-Jiang; Wang, An-Bang; Wang, Yun-Cai

2010-06-01

489

UWB radar technique for arc detection in coaxial cables  

NASA Astrophysics Data System (ADS)

UWB signals constituted by a sequence of chips (properly chosen to reduce side lobes and to improve detection accuracy) are transmitted along the transmission lines at a specified Pulse Repetition Frequency (PRF) and their echoes are received by means of directional couplers. The core of the receiver is an ultra high-speed correlator implemented in a Digital Signal Processor (DSP). When a target (arc) is detected, its position and its ``radar cross section'' are calculated to be able to provide the arc position along the transmission line and to be able to classify the type of detected arc. The ``background scattering'' is routinely extracted from the received signal at any pulse. This permits to be resilient to the background structure of transmission lines (bends, junctions, windows, etc.). Thanks to the localization feature, segmentation is also possible for creating sensed and non- sensed zones (for example, to be insensitive to antenna load variations). A complete test bed has been installed using standard coaxial cables (RG58) to demonstrate the system capabilities.

Salvador, Sara; Maggiora, Riccardo

2010-11-01

490

Integration of Control Algorithms for Quadrotor UAV's Using an Indoor Sensor Environment.  

National Technical Information Service (NTIS)

This thesis develops an architecture that facilitates the design and indoor testing of control algorithms implemented onboard quadrotor UAV's using an ultra-wideband (UWB) indoor positioning solution from Ubisense. Initially, details are provided on basic...

B. D. Watts

2011-01-01

491

A 2D simple attenuation model for EM waves in human tissues: Comparison with a FDTD 3D simulator for UWB medical radar  

Microsoft Academic Search

This paper describes a simple 2D model for the propagation of electro-magnetic (EM) pulses in human tissues. To assess the reliability of using this model for fast attenuation evaluation of UWB radar pulses in the body, the model is compared with a well known 3D FDTD numeric simulator using a simple multilayer geometry. Results from the 2D model were found

G. Varotto; E. M. Staderini

2008-01-01

492

Position Estimation of Tranceivers in Communication Networks  

SciTech Connect

With the rapid development in wireless sensor networks, there is an important need for transceiver position estimation independent of Global Positioning Systems (GPS) [1,3]. While GPS might be useful for outdoor sensor nodes, it is not for indoor node localization. In this case, position estimation is possible through network range estimates from time-of-flight (TOF) measurements, a technique well suited to large bandwidth physical links, such as in ultra-wideband (UWB) communications. For example, in our UWB systems, with pulse duration less than 200 pico-seconds, range can easily be resolved to less than a foot. Assuming an encoded UWB or spread spectrum physical layer, we developed algorithms and simulation tools to test transceiver position localization. Simulations were designed to lend insight into system characteristics such as position error sensitivities to network geometry, to range estimation errors, and to number of sensor nodes.

Kent, C A; Dowla, F U

2003-10-13

493

47 CFR 15.503 - Definitions.  

Code of Federal Regulations, 2010 CFR

...purpose of this subpart, the UWB bandwidth is the frequency... (d) Ultra-wideband (UWB) transmitter. An intentional...or greater than 0.20 or has a UWB bandwidth equal to or greater...consisting of ground penetrating radar systems, medical...

2010-10-01

494

47 CFR 15.503 - Definitions.  

Code of Federal Regulations, 2010 CFR

...purpose of this subpart, the UWB bandwidth is the frequency... (d) Ultra-wideband (UWB) transmitter. An intentional...or greater than 0.20 or has a UWB bandwidth equal to or greater...consisting of ground penetrating radar systems, medical...

2009-10-01

495

UWB radar technique for arc detection in coaxial cables and waveguides  

NASA Astrophysics Data System (ADS)

As spread spectrum technology has revolutionized the communications industry, Ultra Wide Band (UWB) technology is dramatically improving radar performances. These advanced signal processing techniques have been adapted to coaxial cables and waveguides to provide new features and enhanced performance on arc detection. UWB signals constituted by a sequence of chips (properly chosen to reduce side lobes and to improve detection accuracy) are transmitted along the transmission lines at a specified Pulse Repetition Frequency (PRF) and their echoes are received by means of directional couplers. The core of the receiver is an ultra high-speed correlator implemented in a Digital Signal Processor (DSP). When a target (arc) is detected, its position and its ``radar cross section'' are calculated to be able to provide the arc position along the transmission line and to be able to classify the type of detected arc. The ``background scattering'' is routinely extracted from the received signal at any pulse. This permits to be resilient to the background structure of transmission lines (bends, junctions, windows, etc.). Thanks to the localization feature, segmentation is also possible for creating sensed and non-sensed zones (for example, to be insensitive to antenna load variations).

Maggiora, R.; Salvador, S.

2009-11-01

496

Imaging of Distributed Objects in UWB Sensor Networks  

NASA Astrophysics Data System (ADS)

The chapter proposes a new imaging algorithm. This algorithm is suitable for the imaging of extended objects in UWB sensor networks. Its comparison to the conventional range migration algorithm known from GPR or similar applications is given by a simulated example. The example shows disadvantages of the range migration algorithm for imaging in UWB sensor networks. Images obtained by the new proposed algorithm are easier to interpret and their quality is much higher.

Zetik, R.; Thomä, R. S.

497

Cross-correlated back projection for UWB radar imaging  

Microsoft Academic Search

This paper presents a cross-correlated time-reversal algorithm for the reconstruction of UWB radar images. In comparison to a standard backprojection scheme, this algorithm produces images of superior quality with better cross-range resolution. Furthermore, by cross correlating the UWB array channels with a reference channel located appropriately away from the array center, this algorithm can improve the cross-range resolution of the

Senglee Foo; S. Kashyap

2004-01-01

498

An algorithm for UWB radar-based human detection  

Microsoft Academic Search

This paper presents an algorithm for human presence detection in urban environments using an ultra-wide-band (UWB) impulse-based mono-static radar. A specular multi-path model (SMPM) is used to characterize human body scattered UWB waveforms. The SMPM parameters are used within a classical likelihood ratio detector framework to detect the presence of humans via gait, with the aid of a multi-target tracking

SangHyun Chang; Naoki Mitsumoto; Joel W. Burdick

2009-01-01

499

UWB for low data rate applications: technology overview and regulatory aspects  

Microsoft Academic Search

The use of UWB concept is not recent, but the application panel which UWB is targeting at has recently evolved to commercial applications, thanks to favorable FCC rules adopted in 2002. This paper focuses on the UWB capabilities for sensor networks and for ranging, and gives an overview of the regulatory aspects

Patricia Martigne

2006-01-01

500

Power-efficient impulse radio ultrawideband pulse generator based on the linear sum of modified doublet pulses.  

PubMed

We propose a new and power-efficient impulse radio ultawideband (IR-UWB) pulse design concept. The proposed concept is based on a linear sum of modified doublet pulses. The proposed concept is both simulated and experimentally demonstrated. The experimental demonstration employs a photonic scheme that generates the designed pulse using two main steps, mainly optical shaping and differential detection. The optical shaping is performed using a single electro-optic modulator biased in the nonlinear portion of its transfer function, and the differential detection is performed using a balanced photodetector. The generated IR-UWB pulse is fully Federal Communications Commission compliant, even in the highly power-restricted global positioning system band. The proposed optical scheme has potential to be integrated on a compact optical chip and thus suitable for reliable, low-cost, high-speed, short-range UWB wireless access, such as in-building networks. PMID:21686021

Abraha, S T; Okonkwo, C M; Tangdiongga, E; Koonen, A M J

2011-06-15