Sample records for ultra-wideband uwb pulse

  1. A novel ultra-wideband pulse design algorithm

    Microsoft Academic Search

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

    2003-01-01

    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.

  2. Chirp Frequency-Translated Reference Ultra-Wideband (UWB) Wireless Communication System

    Microsoft Academic Search

    Zhang Jian; Hu Han-Ying; Liu Luo-Kun; Wang Tao

    2008-01-01

    A chirp frequency-translated reference ultra-wideband system is proposed based on the time-domain and code-domain transmitted-reference impulse radio UWB systems. Mathematic derivation and simulation results show that while this system has similar performance to pulse-based UWB system without losing the merits, it has the advantages of chirp communication system as well. Meanwhile, this system not only offers a solution of simple

  3. Microstrip bandpass filters for Ultra-Wideband (UWB) wireless communications

    Microsoft Academic Search

    Ching-Luh Hsu; Fu-Chieh Hsu; Jen-Tsai Kuo

    2005-01-01

    A new technique is developed for designing a composite microstrip bandpass filter (BPF) with a 3 dB fractional bandwidth of more than 100%. The BPF is suitable for ultra-wideband (UWB) wireless communications. The design utilizes embedding individually designed highpass structures and lowpass filters (LPF) into each other, followed by an optimization for tuning in-band performance. The stepped-impedance LPF is employed

  4. A study of the ultra-wideband wireless propagation channel and optimum UWB receiver design

    Microsoft Academic Search

    Robert C. Qiu

    2002-01-01

    The paper addresses a crucial point in ultra-wideband (UWB) radio wave propagation, which is the spatial-temporal resolution of scattering objects into multiple frequency-dependent scattering centers. The effect contributes to the widely observed temporal dispersion of pulse-shaped transmit signals and their distortion, respectively. Particularly the latter is explained by (multiple) diffraction of the incident wave, leading to (multiple) band-limited impulse responses

  5. Ultra compact filters for ultra-wideband (UWB) applications using multilayer ring resonators

    Microsoft Academic Search

    SeyyedKamal Hashemi; Dariush Mirshekar-Syahkal

    2009-01-01

    Novel compact ultra-wideband (UWB) bandpass filters are proposed. It is based on multilayer ring resonators (MRR). The ring is applied to any loop shape. The filter has a simple structure for fabrication and the design technique can be adapted in order to realize both narrowband and ultra-wideband filters. With the MRR, filters of bandwidths in excess of 10 GHz while

  6. Abstract--Ultra-wideband (UWB) has been proposed for physical layer standard for high speed wireless personal area

    E-print Network

    Paris-Sud XI, Université de

    Abstract-- Ultra-wideband (UWB) has been proposed for physical layer standard for high speed to traditional wireless technologies in WPANs. This paper describes low complexity high data rate Ultra- wideband related to faults associated with wiring (cutting, shearing, false contacts). Indeed, Ultra Wideband [1

  7. Solid-state ultra-wideband pulse generator: Application in bioeffect research

    Microsoft Academic Search

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

    2005-01-01

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

  8. Ultra-Wideband Waveform Generator Based on Optical Pulse-Shaping and FBG Tuning

    Microsoft Academic Search

    Mohammad Abtahi; Mehrdad Mirshafiei; Julien Magne; Leslie A. Rusch; Sophie Larochelle

    2008-01-01

    We propose and demonstrate experimentally a prototype for ultra-wideband (UWB) waveform generator based on optical pulse shaping. The time-domain pulse shape is written in the frequency domain, and a single-mode fiber performs frequency-to-time conversion. A U.S. Federal Communications Commission (FCC)-compliant power efficient pulse shape is inscribed in the frequency domain by a fiber Bragg grating (FBG) with an excellent match

  9. Solid-state ultra-wideband pulse generator: Application in bioeffect research

    NASA Astrophysics Data System (ADS)

    Sunkam, Ramana K.; Hill, Jerimiah; Selmic, Rastko R.; Haynie, Donald T.

    2005-05-01

    This article describes the design and characterization of an ultra-wideband (UWB) pulse generator suitable for biomedical research. The pulser generates nanosecond-long electromagnetic pulses of adjustable rise time, amplitude, and duration, permitting analysis of possible bioeffects over a range of pulse characteristics. Nanosecond rise-time pulses (2.4 ns) of 3.4 kV are achieved in a four-stage pulser circuit using ZTX415 transistors. This device has been used to assess exposure bioeffects to UWB pulses of the model system E. coli.

  10. Impact Of Ultra Wideband (Uwb) Radio Range On Wireless Sensor Networks

    E-print Network

    Ha, Dong S.

    Impact Of Ultra Wideband (Uwb) Radio Range On Wireless Sensor Networks Woo Cheol Chung, Nathaniel J by regulations, so they must extend radio range through other means. We derive the limits of I-UWB radio range that includes the effects of data rate, signal-to-noise ratio, antenna gains at the transmitter and the receiver

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

    Microsoft Academic Search

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

    2009-01-01

    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

  12. Ultra-Wideband Imaging Systems for Breast Cancer Detection

    E-print Network

    Genov, Roman

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

  13. An energy efficient sub-threshold baseband processor architecture for pulsed ultra-wideband communications

    E-print Network

    Sze, Vivienne

    2006-01-01

    Ultra-wideband (UWB) communications is currently being explored as a medium for high-data-rate last-meter wireless links. Accordingly, there has been much interest in integrating UWB radios onto battery-operated devices, ...

  14. Multistatic radar with ultra-wideband pulses: FDTD simulation

    Microsoft Academic Search

    F. C. B. F. Muller; R. G. Farias; C. Ld. S. S. Sobrinho; V. Dmitriev

    2005-01-01

    A simulation of a multistatic radar using the finite-difference time-domain method is performed to identify the presence of an intruder inside a residence. The radar operates with ultra-wideband pulses to obtain high resolution. One transmitter and three receivers, positioned outside the residence, are used to estimate the location of an intruder inside the residence without ambiguity.

  15. A Compact Monopole UWB Antenna for Ultra Wideband Applications

    Microsoft Academic Search

    Akkala Subbarao; S. Raghavan

    2009-01-01

    A novel compact Ultra wideband antenna fed by CPW is presented. The antenna has a size of 29 mm ?? 32 mm. It provides band width ranging from 2.9 GHz to 11.1 GHz. The antenna can be easily integrated with radio frequency circuit for low cost. Details of antenna are presented with parametric study. The bandwidth is varied by varying

  16. Half-Sized Vertical Monopole Ultra-Wideband (UWB) Antennas for Mobile Applications

    Microsoft Academic Search

    Anping Zhao; J. Ollikainen

    2007-01-01

    Compact dual-band and triple-band ultra-wideband (UWB) antennas based on a half-sized monopole for mobile applications are proposed. The antennas are placed vertically at one corner of the ground plane of a mobile terminal. A wider antenna impedance bandwidth is achieved by adjusting the length of the lower edge of the monopole. Details of the proposed antenna as well as simulated

  17. OPTIMIZED ULTRA-WIDEBAND RADIATION OF DIPOLE ANTENNAS WITH TRIANGLE

    E-print Network

    Southern California, University of

    OPTIMIZED ULTRA-WIDEBAND RADIATION OF DIPOLE ANTENNAS WITH TRIANGLE DRIVING PULSES Anatoliy O Communication Commission (FCC) regulations on spectrum usage. Recent needs and advances in ultra-wideband (UWB. PROBLEM FORMULATION It is accepted1, 2, 3 that conventional wideband antennas like dipoles often do

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

    E-print Network

    Sarabandi, Kamal

    A Compact Ultra-Wideband Antenna for Time- and Frequency- Domain Applications Nader Behdad the early investigations on ultra-wideband (UWB) wireless systems, they have found a wide range, communication systems for military, and UWB short pulse radars for automotive and robotics applications to name

  19. AN ENERGY EFFICIENT SUB-THRESHOLD BASEBAND PROCESSOR ARCHITECTURE FOR PULSED ULTRA-WIDEBAND COMMUNICATIONS

    Microsoft Academic Search

    V. Sze; R. Blazquez; M. Bhardwaj; A. Chandrakasan

    2006-01-01

    This paper describes how parallelism in the digital baseband processor can reduce the energy required to receive ultra- wideband (UWB) packets. The supply voltage of the digital baseband is lowered so that the correlator operates near its minimum energy point resulting in a 68% energy reduction across the entire baseband. This optimum supply voltage occurs below the threshold voltage, placing

  20. Performance comparison of ultra-wideband time-hopping, DSSS and OFDM multiple access schemes for wireless sensor networks

    Microsoft Academic Search

    Naveel Riaz; M. Ghavami

    2006-01-01

    Ultra-wideband (UWB) radio communication sys- tems operate using extremely short duration base-band pulses. This paper compares the performance of three competing multi- ple access modulation schemes that have been proposed for appli- cation to UWB based wireless sensor networks. These multiple access schemes are ultra-wideband Time-Hopping (TH-UWB), Direct Sequence Spread Spectrum (DSSS-UWB) and Orthogonal Frequency Division Multiplexing (OFDM-UWB). Each system

  1. Adiabatic and fast passage ultra-wideband inversion in pulsed EPR

    NASA Astrophysics Data System (ADS)

    Doll, Andrin; Pribitzer, Stephan; Tschaggelar, René; Jeschke, Gunnar

    2013-05-01

    We demonstrate that adiabatic and fast passage ultra-wideband (UWB) pulses can achieve inversion over several hundreds of MHz and thus enhance the measurement sensitivity, as shown by two selected experiments. Technically, frequency-swept pulses are generated by a 12 GS/s arbitrary waveform generator and upconverted to X-band frequencies. This pulsed UWB source is utilized as an incoherent channel in an ordinary pulsed EPR spectrometer. We discuss experimental methodologies and modeling techniques to account for the response of the resonator, which can strongly limit the excitation bandwidth of the entire non-linear excitation chain. Aided by these procedures, pulses compensated for bandwidth or variations in group delay reveal enhanced inversion efficiency. The degree of bandwidth compensation is shown to depend critically on the time available for excitation. As a result, we demonstrate optimized inversion recovery and double electron electron resonance (DEER) experiments. First, virtually complete inversion of the nitroxide spectrum with an adiabatic pulse of 128 ns length is achieved. Consequently, spectral diffusion between inverted and non-inverted spins is largely suppressed and the observation bandwidth can be increased to increase measurement sensitivity. Second, DEER is performed on a terpyridine-based copper (II) complex with a nitroxide-copper distance of 2.5 nm. As previously demonstrated on this complex, when pumping copper spins and observing nitroxide spins, the modulation depth is severely limited by the excitation bandwidth of the pump pulse. By using fast passage UWB pulses with a maximum length of 64 ns, we achieve up to threefold enhancement of the modulation depth. Associated artifacts in distance distributions when increasing the bandwidth of the pump pulse are shown to be small.

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

    NASA Astrophysics Data System (ADS)

    Nguyen, Lam; Tran, Trac D.

    2010-04-01

    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.

  3. Ultra-wideband Communications

    SciTech Connect

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

    2004-02-06

    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.

  4. An ultra wideband TAG circuit transceiver architecture

    Microsoft Academic Search

    Lucian Stoica; Sakari Tiuraniemi; A. Rabbachin; I. Oppermann

    2004-01-01

    The paper presents the architecture of a low power, low complexity ultra wideband (UWB) transceiver circuit. The circuit is designed for low data rate, low cost applications with built in location and tracking. The system is based on a non-coherent architecture which enables the receiver to be extremely simple and largely insensitive to the transmitted pulse shape. The circuit presented

  5. UltraUltra--Wideband (UWB)Wideband (UWB) Wireless CommunicationsWireless Communications

    E-print Network

    Qiu, Robert Caiming

    - Embedded Apps Telematics / Telemetry Ericsson R380 PDQ Smart Phone Palm RIM Blackberry HP Jornada 720 w/ PC Area Network Local Area Network 3G & UWB Combining Air Interface3G & UWB Combining Air Interface W LA NOpen Research Issues · System and protocol design · Analysis, performance modeling · Test-bed development

  6. Performance of ultra-wideband communications in the presence of interference

    Microsoft Academic Search

    Li Zhao; Alexander M. Haimovich

    2002-01-01

    We analyze the performance of ultra-wideband (UWB) communications in the presence of interference. Closed-form expressions are provided for the jam resistance of UWB with binary pulse position modulation utilizing rectangular pulses. A simple approximation is obtained for the special case of tone interference. The jam resistance analysis is extended to more practical UWB waveforms such as Gaussian and Rayleigh monocycles.

  7. A platform for ultra wideband communication systems

    E-print Network

    Ackerman, Nathan (Nathan Joseph)

    2005-01-01

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

  8. UltraUltra--Wideband (UWB)Wideband (UWB) Wireless CommunicationsWireless Communications

    E-print Network

    Qiu, Robert Caiming

    Devices w/ Integral Wireless Modules - Embedded Apps Telematics / Telemetry Ericsson R380 PDQ Smart Phone Combining Air Interface3G & UWB Combining Air Interface W LA N U W B Not to Scale 1 Wide Area cell = ~10 000Open Research IssuesOpen Research Issues · System and protocol design · Analysis, performance modeling · Test

  9. An Agile, Ultra-Wideband Pulse Radio Transceiver With Discrete-Time Wideband-IF

    Microsoft Academic Search

    Frank Zhang; Anuranjan Jha; Ranjit Gharpurey; Peter Kinget

    2009-01-01

    A pulse-based CMOS ultra-wideband transmitter and receiver have been realized using a standard digital 90 nm CMOS process. The transceiver uses digital templates stored in high-speed memories for pulse generation on the transmit side and for correlation on the receive side. This allows fast band switching for multi-band operation and interferer avoidance without the requirement for fast-settling phase-locked loops. The

  10. Pulse-Based, 100 Mbps UWB Transceiver

    Microsoft Academic Search

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

    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,

  11. On Space-Time Coding With Pulse Position and Amplitude Modulations for Time-Hopping Ultra-Wideband Systems

    Microsoft Academic Search

    Chadi Abou-rjeily; Jean-claude Belfiore

    2007-01-01

    In this work, we propose novel families of space-time (ST) block codes that can be associated with impulse radio ultra-wideband (IR-UWB) communication systems. The carrier-less nature of this nonconventional totally real transmission technique necessitates the construction of new suitable coding schemes. In fact, the last generation of complex-valued ST codes (namely, the perfect codes) cannot be associated with IR-UWB systems

  12. Ultra-wideband radar motion sensor

    DOEpatents

    McEwan, T.E.

    1994-11-01

    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.

  13. Ultra-wideband radar motion sensor

    DOEpatents

    McEwan, Thomas E. (Livermore, CA)

    1994-01-01

    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.

  14. A New Pseudorandom Pulse Sequences Aided Noise Suppression Scheme for UWB Transmitted Reference Communication System

    Microsoft Academic Search

    Gang Yang; Ren Shi

    2007-01-01

    Summary Recently Ultra-wideband (UWB) transmitted reference (TR) system has drawn considerable attention in many wireless sensor network location applications due to its low complexity. Its major drawback is serious performance degradation for a very noisy correlation template. In this paper, a new noise suppression scheme for UWB-TR communication system is presented by replacing the repetitive reference pulses with multiple short

  15. Through-the-wall localization of a moving target by two independent ultra wideband (UWB) radar systems.

    PubMed

    Kocur, Dušan; Svecová, Mária; Rov?áková, Jana

    2013-01-01

    In the case of through-the-wall localization of moving targets by ultra wideband (UWB) radars, there are applications in which handheld sensors equipped only with one transmitting and two receiving antennas are applied. Sometimes, the radar using such a small antenna array is not able to localize the target with the required accuracy. With a view to improve through-the-wall target localization, cooperative positioning based on a fusion of data retrieved from two independent radar systems can be used. In this paper, the novel method of the cooperative localization referred to as joining intersections of the ellipses is introduced. This method is based on a geometrical interpretation of target localization where the target position is estimated using a properly created cluster of the ellipse intersections representing potential positions of the target. The performance of the proposed method is compared with the direct calculation method and two alternative methods of cooperative localization using data obtained by measurements with the M-sequence UWB radars. The direct calculation method is applied for the target localization by particular radar systems. As alternative methods of cooperative localization, the arithmetic average of the target coordinates estimated by two single independent UWB radars and the Taylor series method is considered. PMID:24021968

  16. Pulsed ALOHA -a Form of Multiaccess UWB Communications John J. Metzner

    E-print Network

    Yener, Aylin

    1 Pulsed ALOHA - a Form of Multiaccess UWB Communications John J. Metzner Pennsylvania State- Pulsed ALOHA is a form of impulse Ultra-Wideband communication where a bit is carried with each pulse, rather than using a time spreading code. Pulsed ALOHA and Wideband ALOHA are perfect fits to low energy

  17. Ultra-Wideband Fast Acquisition System for Positioning in an Underground Mining Environment

    Microsoft Academic Search

    Yassine Salih Alj; Charles L. Despins; Sofiène Affes

    2008-01-01

    A major application of wireless communications in confined indoor areas is positioning. Ultra-wideband (UWB) has been recently promoted as a very promising physical support for such use. However, fast and accurate timing acquisition of the ultra-short pulses transmitted in indoor environments is significantly challenging, and even more so in hostile areas such as underground mines. This paper presents an UWB

  18. Ultra-wideband Communications

    Microsoft Academic Search

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

    2004-01-01

    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

  19. Testing and Research on Interference to GPS from UWB Transmitters

    E-print Network

    Stanford University

    . / RTCA Sally Frodge U.S. Department Of Transportation ABSTRACT Ultra-Wideband (UWB) signal transmission on very short pulses of radio frequency energy. UWB technology has potential in a variety of applications examined such as antenna manipulation and spectrum whitening. 1.0 INTRODUCTION The concept of Ultra-Wideband

  20. 3D SAR image formation for underground targets using ultra-wideband (UWB) radar

    NASA Astrophysics Data System (ADS)

    Nguyen, Lam; Dogaru, Traian; Innocenti, Roberto

    2009-05-01

    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.

  1. A fast acquisition system for ultra-wideband wireless multiple-access communications

    Microsoft Academic Search

    Yassine Salih Alj; Charles Despins; Sofiene Affes

    2009-01-01

    The fast and accurate timing acquisition of short ultra-wideband (UWB) pulse shapes and, implicitly, the required high sampling rates play a significant role in UWB receiver-structure design and create challenges for signal acquisition under non-ideal conditions. Furthermore, the pulse shape is seen as one of the key factors influencing the performance of UWB systems. While fulfilling the power-spectral-density emission requirements,

  2. Signal Processing Algorithms for Ultra-Wideband Wireless Communications

    E-print Network

    Langendoen, Koen

    . . . . . . . . . . . . . . . . . . 12 2.1.2 Standardization and applications . . . . . . . . . . . . . . . . . 14 2.1.3 UWB channelsSignal Processing Algorithms for Ultra-Wideband Wireless Communications PROEFSCHRIFT ter to Ultra-Wideband Radio . . . . . . . . . . . . . . . . 11 2.1.1 Impulse Radio Ultra-Wideband

  3. On the ranging performance in an underground mine using an ultra-wideband fast acquisition system

    Microsoft Academic Search

    Yassine Salih-Alj; Charles Despins; Sofiene Affes

    2009-01-01

    Ultra-wideband (UWB) communication systems provide very high data rates by transmitting extremely short duration pulses. The impulse waveform is one of the key factors that influence the performance of these systems. While fulfilling the FCC spectral emission requirements, the pulse shape must offer high detection capabilities with suitable levels of accuracy. In this paper, various pulse shapes are considered within

  4. On the ranging performance in an underground mine using ultra-wideband fast acquisition system

    Microsoft Academic Search

    Yassine Salih Alj; Charles Despins; Sofiene Affes

    2009-01-01

    Ultra-wideband (UWB) communication systems provide very high data rates by transmitting extremely short duration pulses. The impulse waveform is one of the key factors that influence the performance of these systems. While fulfilling the FCC spectral emission requirements, the pulse shape must offer high detection capabilities with suitable levels of accuracy. In this paper, various pulse shapes are considered within

  5. Ultra-wideband directional sampler

    DOEpatents

    McEwan, T.E.

    1996-05-14

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

  6. Highly selective microstrip bandpass filters for ultra-wideband (UWB) applications

    Microsoft Academic Search

    Wei-Ting Wong; Yo-Shen Lin; Chi-Hsueh Wang; Chun Hsiung Chen

    2005-01-01

    Highly selective microstrip bandpass filters for UWB applications are proposed, by using the optimum distributed highpass filter structure of 11th-order to achieve a wide bandwidth from 3.1 to 10.6GHz as well as good selectivity. In addition, suitable filter layout is adopted to reduce the filter size and the number of vias required. Specifically, two compact 11th-order UWB microstrip bandpass filters

  7. Small UWB antenna with improved efficiency for pulse radiation

    Microsoft Academic Search

    A. A. Lestari; A. B. Suksmono; E. Bharata; A. G. Yarovoy; L. P. Ligthart

    2005-01-01

    The paper describes an ultra-wideband (UWB) antenna developed for impulse ground penetrating radar (GPR) applications. The antenna is a modified bow-tie antenna designed for short-range GPR applications such as road inspection and non-destructive testing of concrete. For these applications, the transmitted pulses should have minimal ringing to avoid masking of targets. This can be achieved by the application of resistive

  8. Narrowband interference suppression in time-hopping impulse radio ultra-wideband communications

    Microsoft Academic Search

    Jiangzhou Wang; Wong Tat Tung

    2006-01-01

    Ultra-wideband (UWB) technology has been consid- ered an innovative solution for future short-range high-speed wire- less communications. Interference suppression is important for the UWB devices to operate over spectrum occupied by narrowband systems. In this paper, the use of a notch filter in time-hopping im- pulse radio (TH-IR) for UWB communication is considered, where a Gaussian monopulse is employed with

  9. Monocycle shapes for ultra wideband system

    Microsoft Academic Search

    Xiaomin Chen; Sqfe Kiaei

    2002-01-01

    Ultra Wideband (UWB) is a promising technique for wireless communications. It is a carrier-free (base-band) technique, which will greatly reduce the complexity and cost of the transceiver. In contrast with the conventional communication systems using the \\

  10. 100 GHz ultra-wideband (UWB) fiber-to-the-antenna (FTTA) system for in-building and in-home networks.

    PubMed

    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

    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

  11. Ultra-wideband wireless communications

    Microsoft Academic Search

    Weihua Zhuang; Qi Bi

    2003-01-01

    Summary Ultra-wideband (UWB) communication techniques have attracted a great interest in both academia and industry in the past few years for applications in short-range wireless mobile systems. This is due to the potential advantages of UWB transmissions such as low power, high rate, immunity to multipath propagation, less complex transceiver hardware, and low interference. However, tremendous R&D efforts are required

  12. Pulse Shaping, Modulation and Spectrum Shaping for UWB Wireless Communications and the Effects on Interference for Single and Multiband Transmission of UWB Signals

    Microsoft Academic Search

    Michael Sablatash

    2006-01-01

    This paper focuses on pulse shaping, modulation techniques, randomization by pseudo noise (PN) and other sequences, and power spectral density (PSD) shaping of ultra wideband (UWB) wireless communication signals and their effects on interference into and by other communication signals. The evolution of techniques proposed for these, and implementations based on research and development since the early 1990's, to those

  13. Direct Conversion Pulsed UWB Transceiver Architecture

    Microsoft Academic Search

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

    2005-01-01

    Ultra-wideband (UWB) communication is an emerging wireless technology that promises high data rates over short distances and precise locationing. The large available bandwidth and the constraint of a maximum power spectral density drives a unique set of system challenges. This paper addresses these challenges using two UWB transceivers and a discrete prototype platform. 1. System considerations

  14. Performance Analysis of Time-Hopping Pulse Width Modulation for Ultra-Wideband Impulse Radio

    Microsoft Academic Search

    Feng Wang; Chengqi Xu; Xuande Ji; Yan Zhang

    2008-01-01

    The ultra wide-band (UWB) technology is going to become one of main technologies in short-range high-rate wireless communications due to its unique characteristics. This paper presents a new modulation scheme-pulse width modulation (PWM) for UWB communication systems and describes the signal model modulated by this modulation scheme based on the time-hopping (TH) multiple access mode. Its bit error rate (BER)

  15. A new transceiver design for multi-band UWB system

    Microsoft Academic Search

    Zhongshan Wu; Jianqiang He; Guoxiang Gu

    2005-01-01

    Pulse position modulation (PPM) and rake receivers are usually used in single-band ultra-wideband (SB-UWB) systems. For multi-band ultra-wideband (MB-UWB) systems, we propose a new transceiver design based on spectral keying (SK) modulation. We develop a blockwise multipath channel model represented by a finite impulse response (FIR) filter bank for MB-UWB systems. At the transmitter end, an SK-modulated information symbol is

  16. Coupled-slotline-hybrid sampling mixer integrated with step-recovery-diode pulse generator for UWB applications

    Microsoft Academic Search

    Jeongwoo Han; Cam Nguyen

    2005-01-01

    A new compact low-cost sampling mixer with internal local strobe-pulse generator for (carrierless) ultra-wideband (UWB) applications, especially for sub-sampling of UWB video pulse signals, is presented along with detailed design information. The sampler employs a double-sided planar structure to facilitate interface with the strobe-pulse generator and the baseband circuit without using wire connections or air bridges, enabling hybrid microwave integrated-circuit

  17. A sub-GHz UWB pulse generator for wireless implantable medical devices

    Microsoft Academic Search

    M. Stoopman; W. A. Serdijn

    2011-01-01

    The design of a MOS-only pulse generator for sub-GHz Ultra-Wideband (UWB) biomedical communication is presented. The oscillator based pulse generator is capable of generating Binary Phase Shift Keying (BPSK) modulated pulses and is tunable in both frequency and output power. A varactor biasing circuit is developed that keeps the varactor bias voltage constant during oscillator startup and shutdown. The pulse

  18. UWB High Data-Rate Wireless Communication System Base on MultiPulse Position Modulation

    Microsoft Academic Search

    Wang Ye-qiu; Lu Ying-hua; Xu Yong; He Peng-fei; Zhang Na

    2006-01-01

    In this paper, we propose a new modulation scheme called L-ary multi-pulse position modulation (L-ary MPPM) for ultra-wideband (UWB) high data-rate wireless communication systems. MPPM is an improved pulse position modulation(PPM) by employing multiple pulses and constant weight code to provide a better system performance with comparison with L-ary single-pulse position modulation (SPPM). The error probability and maximum reliable communication

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

    DOEpatents

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

    2012-01-24

    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.

  20. Slot antenna for ultra-wideband applications

    Microsoft Academic Search

    H. M. Jafari; M. J. Deen; S. Hranilovic; N. K. Nikolova

    2006-01-01

    An ultra-wideband (UWB) antenna is designed for communications applications. Parameters that affect the antenna performance are investigated using both simulations and measurements. The same antenna is redesigned for use in a UWB cancer detection system, and its performance characteristics are investigated in a lossy biological coupling medium

  1. Self Organization of Wireless Sensor Networks Using Ultra-Wideband Radios

    SciTech Connect

    Nekoogar, F; Dowla, F; Spiridon, A

    2004-07-19

    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.

  2. Time Domain Responses of Printed UWB Antennas

    Microsoft Academic Search

    Yiqiong Shi; Sheel Aditya; C. L. Law

    2005-01-01

    Ultra-wideband (UWB) technology deals with generating, transmitting and receiving short pulses of sub-nanosecond duration. Thus, the time domain response of an antenna for UWB applications is as important as the traditional frequency domain antenna parameters. This paper discusses the time domain responses of two types of printed UWB antennas. It is shown that a smaller antenna with a shorter distance

  3. Directional Ultra-Wideband Antennas in Planar Technologies

    E-print Network

    Bornemann, Jens

    UWB antennas for specific applications such as radar systems [8]-[9]. The recent work on a directionalDirectional Ultra-Wideband Antennas in Planar Technologies Marjan Mokhtaari and Jens Bornemann Abstract -- Directional ultra-wideband antennas in various planar technologies are described. All designs

  4. Multiple Antenna Time Reversal Transmission In Ultra-Wideband Communications

    E-print Network

    Moura, José

    Multiple Antenna Time Reversal Transmission In Ultra-Wideband Communications Yuanwei Jin, Yi Jiang Abstract-- In this paper we study the multiple antenna time reversal downlink transmission in an ultra-wideband antennas and the user has a single antenna. We design the UWB beamformer that focuses on the intended user

  5. Printed-Circuit Antennas for Ultra-Wideband Monitoring Applications

    E-print Network

    Bornemann, Jens

    Printed-Circuit Antennas for Ultra-Wideband Monitoring Applications Marjan Mokhtaari and Jens (UWB) monitoring applications are introduced. Both microstrip and coplanar waveguide antennas operate, BC, V8W 3P6, Canada j.bornemann@ieee.org Abstract -- Two new printed-circuit antennas for ultra-wideband

  6. A 4-bit Ultra-Wideband Beamformer with 4ps True Time Delay Resolution Jonathan D. Roderick, Harish Krishnaswamy, Kenneth Newton, and Hossein Hashemi

    E-print Network

    Southern California, University of

    , it fails to mimic the true time delay needed in ultra-wideband (UWB) multi-antenna systems. UWB phased@usc.edu Abstract-- This paper documents an ultra-wideband (UWB) fully integrated beamformer which featuresA 4-bit Ultra-Wideband Beamformer with 4ps True Time Delay Resolution Jonathan D. Roderick, Harish

  7. 890 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 57, NO. 4, APRIL 2009 Post-Compensation of Ultra-Wideband Antenna

    E-print Network

    Purdue University

    -Compensation of Ultra-Wideband Antenna Dispersion Using Microwave Photonic Phase Filters and Its Applications to UWB experimental post-compensation of ultra-wideband (UWB) antenna dispersion at a receiver front-end by using and communications. Index Terms--Antenna dispersion, microwave photonics, radar resolution, ultra-wideband (UWB

  8. Ultra-wideband communications: an idea whose time has come

    Microsoft Academic Search

    Liuqing Yang; G. B. Giannakis

    2004-01-01

    Ultra-wideband (UWB) radio is a fast emerging technology with many unique attractive features that promotes major advances in wireless communications, networking, radar, imaging, and positioning systems. Research in UWB is still in its infancy stages, offering limited resources in handling the challenges facing the UWB communications. Understanding the unique properties and challenges of UWB communications as well as its application

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

    E-print Network

    Bornemann, Jens

    Ultra-Wideband Printed-Circuit Array Antenna for Medical Monitoring Applications Hung-Jui (Harry measurements. Keywords ­ Printed-circuit antennas, ultra-wideband antennas, (UWB), antenna array, coplanar) technology, the UWB antenna is one of the most essential components for a UWB system. Many applications

  10. Ultra-wideband precision asset location system

    Microsoft Academic Search

    Robert J. Fontana; Steven J. Gunderson

    2002-01-01

    A prototype ultra-wideband (UWB) precision asset location (PAL) system was developed and tested aboard the SS Curtiss in Port Hueneme, California. The PAL system was developed to assess the capability of UWB geolocation to operate in severe multipath shipboard environments. The PAL system was based on an earlier UWB relative-time-of-arrival (RTOA) transceiver location system and was extended to a differential-time-of-arrival

  11. Antenna and pulse designs for meeting UWB spectrum density requirements

    Microsoft Academic Search

    Guofeng Lu; Predrag Spasojevic; Larry Greenstein

    2003-01-01

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

  12. Hemispheric ultra-wideband antenna.

    SciTech Connect

    Brocato, Robert Wesley

    2006-04-01

    This report begins with a review of reduced size ultra-wideband (UWB) antennas and the peculiar problems that arise when building a UWB antenna. It then gives a description of a new type of UWB antenna that resolves these problems. This antenna, dubbed the hemispheric conical antenna, is similar to a conventional conical antenna in that it uses the same inverted conical conductor over a ground plane, but it also uses a hemispheric dielectric fill in between the conductive cone and the ground plane. The dielectric material creates a fundamentally new antenna which is reduced in size and much more rugged than a standard UWB conical antenna. The creation of finite-difference time domain (FDTD) software tools in spherical coordinates, as described in SAND2004-6577, enabled this technological advance.

  13. Low-Sampling Rate UWB Channel Characterization and Synchronization

    E-print Network

    Vetterli, Martin

    and timing for digi- tal ultra-wideband (UWB) receivers. We extend some of our recent results in sampling (UWB) technology has recently received much attention for many short-range applications] [2] [3] [4] [5]. UWB signals are generated by driving an antenna with very short electrical pulses

  14. Rapid acquisition for ultra-wideband localizers

    Microsoft Academic Search

    Robert Fleniing; Cherie Kushner; Gary Roberts; Uday Nandiwada

    2002-01-01

    Ultra-wideband (UWB) signals as implemented in our localizers provide a foundation for highly accurate methods of 3D position determination using precise ranging between any two nodes. In a large, distributed network of nodes, the time required for all nodes to acquire each other is of paramount importance. We have developed a method of rapid acquisition that allows two nodes to

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

    Microsoft Academic Search

    John D. Choi; Wayne E. Stark

    2002-01-01

    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

  16. A survey of antennas for ultra-wideband applications

    Microsoft Academic Search

    Maysam Sarfaraz; Amir Shirkhodaie

    2008-01-01

    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

  17. System considerations for ultra-wideband wireless networks

    Microsoft Academic Search

    Matthew L. Welborn

    2001-01-01

    This paper describes some general properties of ultra-wideband (UWB) communications systems and identify characteristics of UWB technology that make it an attractive solution for indoor wireless networks. This paper describes a number of different modulation and coding schemes that are possible for UWB communication systems. Based on results in the literature and additional analysis here, approaches likely to provide the

  18. A differential detector for an ultra-wideband communications system

    Microsoft Academic Search

    Minnie Ho; V. Srinivasa Somayazulu; Jefsey Foerster; Sumit Roy

    2002-01-01

    Systems using ultra-wideband (UWB) technology have been shown to achieve very high data rates (100 Mbps and above) for short-range, indoor applications. UWB signals exhibit a number of performance advantages in terms of multipath resolution and fading reduction. However, UWB systems can also exhibit significant implementation complexity in timing, synchronization, and signal correlation. This paper presents a differential detector that

  19. Photonic ultra-wideband pulse generation, hybrid modulation and dispersion-compensation-free transmission in multi-access communication systems.

    PubMed

    Tan, Kang; Shao, Jing; Sun, Junqiang; Wang, Jian

    2012-01-16

    We propose and demonstrate a scheme for optical ultrawideband (UWB) pulse generation by exploiting a half-carrier-suppressed Mach-Zehnder modulator (MZM) and a delay-interferometer- and wavelength-division-multiplexer-based, reconfigurable and multi-channel differentiator (DWRMD). Multi-wavelength, polarity- and shape-switchable UWB pulses of monocycle, doublet, triplet, and quadruplet are experimentally generated simply by tuning two bias voltages to modify the carrier-suppression ratio of MZM and the differential order of DWRMD respectively. The pulse position modulation, pulse shape modulation, pulse amplitude modulation and binary phase-shift keying modulation of UWB pulses can also be conveniently realized with the same scheme structure, which indicates that the hybrid modulation of those four formats can be achieved. Consequently, the proposed approach has potential applications in multi-shape, multi-modulation and multi-access UWB-over-fiber communication systems. PMID:22274463

  20. Design of an Ultra-Wideband Antenna Using Taguchi's Optimization Method Wei-Chung Weng 1

    E-print Network

    Elsherbeni, Atef Z.

    , and UWB antennas. 1. Introduction In 2002, the Federal Communications Commission (FCC) released the ultra-widebandDesign of an Ultra-Wideband Antenna Using Taguchi's Optimization Method Wei-Chung Weng 1 , Fan Yang (UWB) antenna, where Taguchi's method is applied as an external optimizer to drive IE3D and optimize

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

    E-print Network

    Southern California, University of

    Short-Range Ultra-Wideband Systems UMass Antenna Lab USC UltRa Lab UC Berkeley BWRC MURI Review: Lunch Break #12;Short-Range Ultra-Wideband Systems UMass Antenna Lab USC UltRa Lab UC Berkeley BWRC;Short-Range Ultra-Wideband Systems UMass Antenna Lab USC UltRa Lab UC Berkeley BWRC UMass UWB Link

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

    E-print Network

    Southern California, University of

    Short-Range Ultra-Wideband Systems UMass Antenna Lab USC UltRa Lab UC Berkeley BWRC 1:15 PM) #12;Short-Range Ultra-Wideband Systems UMass Antenna Lab USC UltRa Lab UC Berkeley BWRC Long Range-time emulation and CMOS implementation. The UWB MURI Team #12;Short-Range Ultra-Wideband Systems UMass Antenna

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

    E-print Network

    Southern California, University of

    for UWB systems #12;Short-Range Ultra-Wideband Systems UMass Antenna Lab USC UltRa Lab UC Berkeley BWRCShort-Range Ultra-Wideband Systems UMass Antenna Lab USC UltRa Lab UC Berkeley BWRC · Some recent results of relevance to UWB theory and practice · Some UWB antenna problems that are outstanding · Future

  4. Optimal Waveforms Design for Ultra-Wideband Impulse Radio Sensors

    PubMed Central

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

    2010-01-01

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

  5. Free space optical ultra-wideband communications over atmospheric turbulence channels.

    PubMed

    Davaslio?lu, Kemal; Ca?iral, Erman; Koca, Mutlu

    2010-08-01

    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 in the received light intensity mainly due to the atmospheric turbulence. For this reason, theoretical detection error probability analysis is presented for the proposed system for a time-hopping pulse-position modulated (TH-PPM) UWB signal model under weak, moderate and strong turbulence conditions. For the optical system output distributed over radio frequency UWB channels, composite error analysis is also presented. The theoretical derivations are verified via simulation results, which indicate a computationally and spectrally efficient UWB-over-FSO system. PMID:20721053

  6. UWB antenna array

    Microsoft Academic Search

    Dau-Chyrh Chang; Chao-Hsiang Liao; Powen Hsu

    2011-01-01

    This paper compares the performances of ultra wideband (UWB) arrays that use sinusoidal waveform for power pattern and ultra-short pulse waveform for energy pattern. In general, antenna arrays cannot have element spacing larger than one wavelength in any plane because the resulting grating lobes absorb much power, which will limit the bandwidth of antenna arrays. In particular, there are substantial

  7. Performance Analysis of Directional Beacon based Position Location Algorithm for UWB Systems

    E-print Network

    Minnesota, University of

    of around 30 cm with a pragmatic 4-element antenna array using 2.4GHz UWB pulses and 4-bit A/D converter the past three years there has been an increasing in- terest in ultra wideband (UWB) based communication applications. These inherent properties of UWB systems make them a promising choice for wireless sensor

  8. UWB based oil quality detection

    Microsoft Academic Search

    Boris Levitas; Jonas Matuzas; Ganapathy Viswanath; Vijaykumar Basalingappa; Vijendran Venkoparao

    2011-01-01

    In this paper we discuss an approach for fuel quality detection using Ultra-wideband (UWB) radar. The experimental setup consists of an ultrashort monocycle pulse transmitter (30 ps), an UWB sampling receiver and UWB antennae (3.1- 10.6 GHz). One dimensional Finite Difference Time Domain (FDTD) model was used to model the electromagnetic wave propagation and assess the feasibility of oil quality

  9. Investigation of the behavior of protection elements against field radiated line coupled UWB-pulses

    NASA Astrophysics Data System (ADS)

    Krzikalla, R.; Ter Haseborg, J. L.

    2006-09-01

    To protect electronic systems against electromagnetic interferences in general nonlinear protection circuits are used. These protection circuits are optimized mostly against special transient interferences such as lightning electromagnetic pulses (LEMP) or electromagnetic pulses caused by nuclear explosions (NEMP). Previous investigations have shown that these protection elements could be undermined by so-called ultra wideband (UWB) pulses. Thereby a direct charge of the UWB-pulse to the elements has been assumed. This assumption was a worst case approximation because in practice UWB-pulses only get into systems by coupling effects. In this investigation the behavior of typical nonlinear protection elements has been tested with field radiated line coupled UWB-pulses. For that line coupled UWB-pulses have been defined depending on the coupling behavior of typical electronic systems and a possibility of generation of this kind of pulses is presented. After it typical nonlinear protection elements such as spark gaps, varistors and protection diodes have been tested with the previously defined test pulses. Finally the measured behavior of the elements has been compared with the behavior by direct charged UWB-pulses and the protection effect of the elements against field radiated line coupled UWB-pulses is re-evaluated.

  10. An EnantioMorphic BLumlein ultra-wideband source

    SciTech Connect

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

    1992-09-01

    Working designs exist for 1 GW, 1 kHz ultra-wideband (UWB) sources (e. g. SNIPER). As these generators are pressed to higher peak powers and repetition rates, insulation, energy loss due to stray capacitance, and system efficiency (including power supplies and modulators) become critical issues. The EnantioMorphic (mirror image) BLumlein (EMBL) is a new type of vector inversion transmission line pulser which is designed to alleviate some of these problems. The design goals for EMBL are: 10 GW peak power, 700 kV,{approximately}1 kHz rep-rate and <100 ps risetime in a 50 ohm geometry. A gas spark gap peaking switch adds UWB frequency components to the EMBL output pulse.

  11. An EnantioMorphic BLumlein ultra-wideband source

    SciTech Connect

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

    1992-01-01

    Working designs exist for 1 GW, 1 kHz ultra-wideband (UWB) sources (e. g. SNIPER). As these generators are pressed to higher peak powers and repetition rates, insulation, energy loss due to stray capacitance, and system efficiency (including power supplies and modulators) become critical issues. The EnantioMorphic (mirror image) BLumlein (EMBL) is a new type of vector inversion transmission line pulser which is designed to alleviate some of these problems. The design goals for EMBL are: 10 GW peak power, 700 kV,{approximately}1 kHz rep-rate and <100 ps risetime in a 50 ohm geometry. A gas spark gap peaking switch adds UWB frequency components to the EMBL output pulse.

  12. UWB transmitter

    DOEpatents

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

    2013-01-15

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

  13. Optimal pilot waveform assisted modulation for ultra-wideband communications

    Microsoft Academic Search

    Liuqunig Yang; Georgios B. Giannakis

    2002-01-01

    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

  14. A small couple slotted antenna for ultra wideband application

    Microsoft Academic Search

    Yusnita Rahayu; T. A. Rahman; R. Ngah; P. S. Hall

    2009-01-01

    The demand for ultra wideband (UWB) communications is rapidly increasing due to the need to support more users and to provide more information with higher data rates. With appropriate technical standards, UWB devices can operate using spectrum occupied by existing radio services without causing interference, thereby permitting scarce spectrum resources to be used more efficiently. This paper presents a small

  15. Shorted biconical antenna for ultra-wideband applications

    Microsoft Academic Search

    J. D. Morrow

    2003-01-01

    This paper presents a simple low-gain omnidirectional ultra-wideband (UWB) antenna. The VSWR is 2:1 or better over the FCC-specified UWB operating band of 3.1 GHz to 10.6 GHz, and the total combined omnidirectionality is better than 12 dB.

  16. Low Complexity TOA Estimation for Impulse Radio UWB Systems

    Microsoft Academic Search

    I. Guvenc; Z. Sahinoglu

    2005-01-01

    Due to extremely narrow pulses, an impulse radio singaling has a strong potential for high- precision positioning. Highly dispersive nature of ultra-wideband (UWB) channels makes time of arrival (TOA) estimation extremely challenging, where the leading-edge path is not necessar- ily the strongest path. Since the bandwidth of a received UWB signal is very large, the Nyquist rate sampling becomes impractical,

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

    Microsoft Academic Search

    Jeongwoo Han; Cam Nguyen

    2007-01-01

    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

  18. Coplanar Printed-Circuit Antenna With Band-Rejection Elements For Ultra-Wideband Filtenna Applications

    E-print Network

    Bornemann, Jens

    Coplanar Printed-Circuit Antenna With Band-Rejection Elements For Ultra-Wideband Filtenna Introduction Filtennas consist of wideband antenna structures, which incorporate narrowband filter elements for band selection or interference reduction [1]. Especially with respect to ultra-wideband (UWB

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

    E-print Network

    Bornemann, Jens

    Design of Compact Dual-Polarized Printed-Circuit Antenna for Ultra-Wideband Applications K. Rambabu a small printed-circuit antenna, which is well suited for ultra-wideband and dual- polarized applications for short-range and high bandwidth applications, e.g. [1]. UWB antenna performance can be achieved

  20. A compact tapered-slot-feed annular slot antenna for ultra-wideband applications

    Microsoft Academic Search

    Tzyh-Ghuang Ma; Shyh-Kang Jeng

    2004-01-01

    A novel compact tapered-slot-fed annular slot antenna suitable for ultra-wideband (UWB) applications is presented. Frequency domain as well as time domain characteristics of the antenna are well investigated and discussed. A measure to quantify the performance of the radiation patterns of such an ultra-wideband antenna is described.

  1. A tapered-slot-feed loop antenna for ultra-wideband applications

    Microsoft Academic Search

    Tzyh-Ghuang Ma; Shyh-Kang Jeng

    2004-01-01

    A novel tapered-slot-fed loop antenna suitable for ultra-wideband (UWB) applications is presented. Frequency domain characteristics of the antenna are well investigated and a measure to quantify the radiation patterns of such an ultra-wideband antenna is described. Time domain behaviors of the proposed antenna are derived and discussed as well.

  2. AN ABSTRACT OF A THESIS TIME-REVERSED MIMO FOR ULTRA-WIDEBAND

    E-print Network

    Qiu, Robert Caiming

    - reversed systems. Ultra-wideband (UWB) has many merits wich include low-cost design, high data rates antennas in a TiR UWB-MIMO system is investigated. Measurement and simulation experiments are carried out spacing for a TiR UWB- MIMO system with two receive antennas and compares to a TiR UWB-MISO system

  3. Design Considerations for Low-Power Ultra Wideband Receivers

    Microsoft Academic Search

    Payam Heydari

    2005-01-01

    This paper studies design considerations for low-power ultra wideband (UWB) receiver architectures. First, three different architectures for the impulse-radio UWB transceiver are studied, while investigating the power-performance trade-offs. As is elaborated in the paper, a more power-efficient architecture should undertake part of the signal processing in the analog-domain. Next, the multiband UWB transceiver is studied and power-efficient circuits for the

  4. A high speed image transmission system for ultra-wideband wireless links

    E-print Network

    Liang, Helen He

    2009-01-01

    Ultra-wideband (UWB) communication is an emerging technology that offers short range, high data rate wireless transmission, with low power consumption and low consumer cost. Operating in the 3.1 GHz - 10.6 GHz frequency ...

  5. A non-coherent ultra-wideband receiver : algorithms and digital implementation

    E-print Network

    Vitavasiri, Sinit

    2007-01-01

    Ultra-wideband (UWB) communication is an emerging technique for wireless transmission in the 3.1-10.6 GHz unlicensed band with signal bandwidths of 500 MHz or greater. A non-coherent receiver based on energy collection ...

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

    E-print Network

    Prentice, Samuel J. (Samuel James)

    2007-01-01

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

  7. A generalized time domain multipath channel and its application in ultra-wideband (UWB) wireless optimal receiver design-Part II: physics-based system analysis

    Microsoft Academic Search

    Robert C. Qiu

    2004-01-01

    This paper has established a new theoretical framework that allows us to analyze the ultra-wideband system performance using the closed form formulations. A new generalized time-domain multipath channel based on the geometric theory of diffraction\\/uniform theory of diffraction (GTD\\/UTD) framework is incorporated into the system bit-error rate and signal-to-noise ratio by modifying the existing system model. Closed form expressions for

  8. UWB Radio Module Design for Wireless Intelligent Systems-From Specification to Implementation

    Microsoft Academic Search

    Meigen Shen; Tero Koivisto; Teemu Peltonen; Li-Rong Zheng; Esa Tjukanoff; Hannu Tenhunen

    2005-01-01

    In this paper, we designed an impulse-based ultra wideband (UWB) radio module (low band) for wireless intelligent system applications such as radio frequency identification (RFID) and wireless sensor networks (WSN). The UWB radio module includes transceiver block, baseband process unit and power management block. The transceiver circuits include Gaussian pulse generator, wideband low noise amplifier (LNA), multiplier, integrator and timing

  9. On diversity improvements for ultra wideband communication systems

    Microsoft Academic Search

    Keni Popovski

    2008-01-01

    The wireless communications arena consists of a wide range of products and services, each with a specific target market and approach. Having characteristic advantages and disadvantages, all attempt to increase their market share through diversification and innovation. Ultra wideband (UWB) is a recent entry into the commercial short-range communications world, differentiated by its sparse spectral profile and low peak power

  10. A Circular Wire Antenna for Ultra Wideband Applications

    Microsoft Academic Search

    Z. Zhang; J. T. Bernhard

    2007-01-01

    A novel circular wire antenna suitable for ultra wideband (UWB) applications is presented in this paper. It consists of a circularly curved wire over a ground plane. The wire structure is designed to deliver approximately the same benefits as a circular disc antenna. Effective length is introduced to analyze the operation of the antenna. Experimental results of the antenna have

  11. Ultra wideband multiple-input multiple-output radar

    Microsoft Academic Search

    Hammad A. Khan; Wasim Q. Malik; David J. Edwards; Christopher J. Stevens

    2005-01-01

    The utilization of ultra wideband (UWB) signals enables the radar designer to solve the most important problems of radar target observation. The extremely wide bandwidth enables greater information to be obtained due to high time resolution and the frequency dependence of the scattering centers over this large bandwidth. Increase in the radar's signal bandwidth can improve radar performance by providing

  12. Evaluation of an Ultra-Wideband Propagation Channel

    Microsoft Academic Search

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

    2002-01-01

    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,

  13. ISI-free pulses for high-data-rate ultra-wideband wireless systems

    E-print Network

    Chaturvedi, A K

    ´erence intersymbole pour les syst`emes sans fil ultra large bande `a haut d´ebit Ziaul Hasan, Umesh Phuyal, V. Yadav of British Columbia, Vancouver, B.C. V6T 1Z4. E-mail: {ziaulh, phuyal, vijayb}@ece.ubc.ca. V. Ya- dav and A algorithm [3]. The power spectrum of these pulses fits the FCC spectral mask and Ziaul Hasan, Umesh Phuyal

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

    NASA Astrophysics Data System (ADS)

    Wang, Fei; Xu, En-Ming

    2013-06-01

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

  15. Baseband implementation of OTR-UWB receiver using FPGA

    Microsoft Academic Search

    Hossein Gharaee; Abdolreza Nabavi

    2010-01-01

    This paper presents a new transmitted reference ultra-wideband receiver, which utilizes the orthogonal property of even and odd order derivatives of Gaussian pulses in neighboring chips for synchronization. This system, referred to as orthogonal TR-UWB (OTR-UWB), employs only a single spreading code, which results in much lower mean detection time compared to DS-UWB systems since smaller search space is involved

  16. Nonlinear self-reflection of intense ultra-wideband femtosecond pulses in optical fiber

    NASA Astrophysics Data System (ADS)

    Konev, Leonid S.; Shpolyanskiy, Yuri A.

    2013-05-01

    We simulated propagation of few-cycle femtosecond pulses in fused silica fiber based on the set of first-order equations for forward and backward waves that generalizes widely used equation of unidirectional approximation. Appearance of a weak reflected field in conditions default to the unidirectional approach is observed numerically. It arises from nonmatched initial field distribution with the nonlinear medium response. Besides additional field propagating forward along with the input pulse is revealed. The analytical solution of a simplified set of equations valid over distances of a few wavelengths confirms generation of reflected and forward-propagating parts of the backward wave. It allowed us to find matched conditions when the reflected field is eliminated and estimate the amplitude of backward wave via medium properties. The amplitude has the order of the nonlinear contribution to the refractive index divided by the linear refractive index. It is small for the fused silica so the conclusions obtained in the unidirectional approach are valid. The backward wave should be proportionally higher in media with stronger nonlinear response. We did not observe in simulations additional self-reflection not related to non-matched boundary conditions.

  17. An empirical study of electromagnetic interference caused by ultra wideband transmissions in an IEEE 802.11a wireless local area network

    Microsoft Academic Search

    R. A. Raines; M. A. Temple; R. O. Baldwin

    2004-01-01

    Military communications require the rapid deployment of mobile high-bandwidth systems. This work characterizes the electromagnetic interference (EMI) effects of ultra wideband (UWB) transmissions on an IEEE 802.11a ad-hoc network throughput performance. Radiated measurements in an anechoic chamber investigate interference performance for three binary modulation schemes including bi-phase shift keying (BPSK), pulse position modulation (PPM), and on-off keying (OOK) and four

  18. Progress In Electromagnetics Research, Vol. 121, 121139, 2011 LOW-PROFILE DIRECTIONAL ULTRA-WIDEBAND AN-

    E-print Network

    Doran, Simon J.

    Abstract--A compact-size planar antenna with ultra-wideband (UWB) bandwidth and directional patterns of the antenna, a new low-profile antenna configuration is proposed. Three types of directional UWB antennas that the proposed antenna features a reflection coefficient below -10 dB over the UWB range from 4.2 GHz to 8.5 GHz

  19. Optimal and suboptimal receivers for ultra-wideband transmitted reference systems

    Microsoft Academic Search

    Yi-Ling Chao; Robert A. Scholtz

    2003-01-01

    The optimal receiver for an ultra-wideband transmitted reference (UWB TR) system in a single user multipath environment is derived, based on knowledge of channel properties. The performances of this optimal receiver and other crosscorrelation receivers are analyzed and compared. The usual crosscorrelation receiver which is often used in UWB TR systems is shown to be suboptimal. In addition, an UWB

  20. Planar elliptical element ultra-wideband dipole antennas

    Microsoft Academic Search

    H. G. Schantz

    2002-01-01

    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

  1. Small, planar, ultra-wideband antennas with top-loading

    Microsoft Academic Search

    Taeyoung Yang; W. A. Davis; W. L. Stutzman

    2005-01-01

    A new top-loaded ultra-wideband antenna covering the 2.4-10.6 GHz impedance bandwidth (VSWR<2.5) and the 2.05-11.6 GHz UWB bandwidth with nearly constant radiated power was introduced. The proposed antenna is a good candidate for backward compatibility of IEEE 802.11g in the 2.4 GHz ISM band, as well as providing an indoor\\/outdoor ultra-wideband frequency range of 3.1-10.6 GHz. In addition, it can

  2. A high sensitive receiver for baseband pulse microwave radar sensor using hybrid technology

    Microsoft Academic Search

    S. Abuasaker; G. Kompa

    2002-01-01

    This paper describes an improved ultra-wideband (UWB) receiver for the receiving of ultra short electrical pulses transmitted by a short-range microwave radar. The receiver comprises an ultra-wideband balun operating in a frequency range of 600 MHz to 6 GHz and an integrated pulse sharpening circuit. The pulse sharpening circuit is driven by square-wave pulses with an amplitude of 1.5 V,

  3. Spotforming with an array of ultra-wideband radio transmitters

    SciTech Connect

    Dowla, F; Spiridon, A

    2004-02-05

    Ultra-wideband (UWB) array signal processing has the distinct advantage in that it is possible to illuminate or focus on ''spots'' at distant points in space, as opposed to just illuminating or steering at certain directions for narrowband array processing. The term ''spotforming'' is used to emphasize the property that point-focusing techniques with UWB waveforms can be viewed as a generalization of the well-known narrowband beamforming techniques. Because methods in spotforming can lead to powerful applications for UWB systems, in this paper we derive, simulate and experimentally verify UWB spot size as a function of frequency, bandwidth and array aperture.

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

    E-print Network

    Southern California, University of

    Short-Range Ultra-Wideband Systems UMass Antenna Lab USC UltRa Lab UC Berkeley BWRC UWB MURI Research ShortShort--Range UltraRange Ultra--Wideband SystemsWideband Systems R. A.R. A. Scholtz (D.(D. GoeckelGoeckel, D., D. PozarPozar, D., D. SchaubertSchaubert)) #12;Short-Range Ultra

  5. IEEE TRANSACTIONS ON ADVANCED PACKAGING, VOL. 30, NO. 3, AUGUST 2007 533 Design and Fabrication of Ultra-Wideband

    E-print Network

    Pham, Anh-Vu

    thin-films by standard PCB equipments. Variations in the LCP thin-film thickness are characterized), microwave, thin-film, ultra-wideband (UWB). I. INTRODUCTION LIQUID crystal polymer (LCP) is a low of Ultra-Wideband Baluns Embedded in Multilayer Liquid Crystal Polymer Flex Andy C. Chen, Member, IEEE

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

    Microsoft Academic Search

    Domenico Zito; Domenico Pepe; Martina Mincica; Fabio Zito; Alessandro Tognetti; Antonio Lanata; Danilo De Rossi

    2011-01-01

    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

  7. Transfer function characterization of UWB antennas based on frequency domain measurement

    Microsoft Academic Search

    Shi Yiqiong; Sheel Aditya; Choi Look Law

    2005-01-01

    It is well-understood that co-design of the transceiver circuit and the antenna can improve matching, efficiency and pulse shape in ultra-wideband (UWB) applications. Transfer function characterization of the UWB antennas is necessary in order for these to be designed together with the circuits. Transfer function characterization of UWB antennas based on frequency domain measurement has been studied in this paper.

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

    Microsoft Academic Search

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

    2002-01-01

    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

  9. Ultra-wideband radios for time-of-flight-ranging and network position estimation

    DOEpatents

    Hertzog, Claudia A. (Houston, TX); Dowla, Farid U. (Castro Valley, CA); Dallum, Gregory E. (Livermore, CA); Romero, Carlos E. (Livermore, CA)

    2011-06-14

    This invention provides a novel high-accuracy indoor ranging device that uses ultra-wideband (UWB) RF pulsing with low-power and low-cost electronics. A unique of the present invention is that it exploits multiple measurements in time and space for very accurate ranging. The wideband radio signals utilized herein are particularly suited to ranging in harsh RF environments because they allow signal reconstruction in spite of multipath propagation distortion. Furthermore, the ranging and positioning techniques discussed herein directly address many of the known technical challenges encountered in UWB localization regarding synchronization and sampling. In the method developed, noisy, corrupted signals can be recovered by repeating range measurements across a channel, and the distance measurements are combined from many locations surrounding the target in a way that minimizes the range biases associated to indirect flight paths and through-wall propagation delays.

  10. Impulse Radio Ultra-Wideband Communication Over Free-Space Optical Links

    E-print Network

    Davaslioglu, Kemal

    2013-01-01

    A composite impulse radio ultra-wideband (IR-UWB) communication system is presented. The proposed system model aims to transmit UWB pulses over several kilometers through free-space optical (FSO) links and depending on the link design, the electrical estimates of the FSO system can be directly used or distributed to end-user through radio-frequency (RF) links over short ranges. However, inhomogeneities on the FSO transmission path cause random fluctuations in the received signal intensity and these effects induced by atmospheric turbulence closely effect the system performance. Several distinct probability distributions based on experimental measurements are used to characterize FSO channels and using these probabilistic models, detection error probability analysis of the proposed system for different link designs are carried out under weak, moderate and strong turbulence conditions. The results of the analysis show that depending on the atmospheric conditions, system performance of the composite link can hav...

  11. Frequency-diversity coded OFDM for ultra-wideband systems with under-sampling-rate receivers

    Microsoft Academic Search

    Mao-Ching Chiu; Wei-Du Wu; Chi-chao Chao

    2005-01-01

    Orthogonal frequency division multiplexing (OFDM) has been proposed for use as the physical layer of ultra-wideband (UWB) systems for high-rate, short-range personal area networking (PAN). For ultra-wideband systems, there is a constraint on the maximum power spectral density for the transmitted signal. Therefore, the bandwidth of the transmitted spectrum must be spread widely by a bandwidth expansion scheme so that

  12. A study of low-power ultra wideband radio transceiver architectures

    Microsoft Academic Search

    Payam Heydari

    2005-01-01

    The paper studies low-power ultra wideband (UWB) transceiver architectures. First, three different architectures for the impulse-radio UWB transceiver are studied, while investigating the power-performance tradeoffs. The paper illustrates that a more power-efficient architecture should perform part of the signal processing in the analog-domain. Next, the multiband UWB transceiver is studied and power-efficient circuits for the front-end of the UWB transceiver

  13. Modeling of multiple access interference and BER derivation for TH and DS UWB multiple access systems

    Microsoft Academic Search

    Somasundaram Niranjayan; Arumugam Nallanathan; Balakrishnan Kannan

    2006-01-01

    A novel analytical method is introduced for exact statistical modeling of multiple access interference (MAI), in time hopping pulse position modulation and pulse amplitude modulation (TH-PPM and TH-PAM) ultra wideband (UWB) systems operating in additive white Gaussian noise (AWGN) channels. Based on this method, exact bit error rates (BER) are expressed in simple formulas. In a similar fashion, the exact

  14. Theoretical study of sensing targets through the wall using ultra-wideband technology

    Microsoft Academic Search

    Xiaoyang Huang; Bingquan Chen; Hong-Liang Cui; Ke Wang; Robert Pastore; Mark Farwell; Wilbur Chin; Jennifer Ross; Moses Mingle

    2005-01-01

    This study investigates the modeling of through-wall sensing using ultra-wideband (UWB) signals. The combined method of ray tracing and diffraction (CMRTD) is employed to model and study the interaction between the UWB signal and the target. The result is obtained in frequency domain, and then transformed into time domain by use of inverse Fourier transform. Numerical results of scattering from

  15. NOVEL COMPACT MICROSTRIP ULTRA-WIDEBAND FILTER UTILIZING SHORT-CIRCUITED STUBS WITH LESS VIAS

    Microsoft Academic Search

    Mohammad Shahrazel Razalli; Alyani Ismail; Mohd Adzir Mahdi; Mohd Nizar Hamidon

    2008-01-01

    We present here a new pattern with compact size of Ultra Wideband (UWB) microwave filter. The filter is based on quarter-wave length short-circuited stubs model. We introduced here a new schematic model by extracting all parasitic elements such as T- junction and discontinuity in our new pattern of UWB filter. This new filter has minimal number of vias and improved

  16. Conditions and Performance of Ideal RAKE Reception for Ultra-Wideband Signals in Lognormal Fading Channels

    Microsoft Academic Search

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

    2003-01-01

    In this paper, the conditions and performance of ideal RAKE reception for time hopping Ultra- Wideband (UWB) investigated. Owing to the complex propagation phenomena and specific structure of UWB signals, new problems relevant to the operation of RAKE receivers arise. This motivates us to reconsider the conditions under which a RAKE receiver can work effectively with negligible interference between fingers.

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

    SciTech Connect

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

    1992-01-01

    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 few tens of kilovolts to 250-kV. EMBL (EnantioMorphic Blumlein) is a similar device (presently under development) which uses a gas switch to short the falling portion of a 2-nS pulse to approximately 100-pS. To date, an output voltage of approximately 600-kV has been obtained (700-kV is the design goal). Depending upon the source, repetitive operation from single shot to 5-kHz (1-kHz nominal) has been obtained with excellent reliability and repeatability. Both sources are plasma switched impulse transmitters using a Hydrogen-thyratron based modulator, an oil-filled Blumlein (of two types), a peaking (or shorting) switch and a wideband TEM horn. Powers exceeding one-gigawatt are routinely generated. This technology appears to be extendable to at least 10-gigawatts. The frequency spectrum of the radiated pulse from these sources include the spectrum of 100-MHz to 3-GHz. The pulse is generated externally and then injected into the antenna. Due to the high powers involved and the need to radiate a broad spectrum of frequencies, Sandia has concentrated on TEM horn antennas. Several TEM horns have been built and used during this program. In those cases where higher gains are desired for the higher frequencies, TEM horn-fed dish antennas have been employed. A detailed overview of the UWB Transmitters along with measured radiated electric field strengths will be presented.

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

    SciTech Connect

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

    1992-09-01

    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 few tens of kilovolts to 250-kV. EMBL (EnantioMorphic Blumlein) is a similar device (presently under development) which uses a gas switch to short the falling portion of a 2-nS pulse to approximately 100-pS. To date, an output voltage of approximately 600-kV has been obtained (700-kV is the design goal). Depending upon the source, repetitive operation from single shot to 5-kHz (1-kHz nominal) has been obtained with excellent reliability and repeatability. Both sources are plasma switched impulse transmitters using a Hydrogen-thyratron based modulator, an oil-filled Blumlein (of two types), a peaking (or shorting) switch and a wideband TEM horn. Powers exceeding one-gigawatt are routinely generated. This technology appears to be extendable to at least 10-gigawatts. The frequency spectrum of the radiated pulse from these sources include the spectrum of 100-MHz to 3-GHz. The pulse is generated externally and then injected into the antenna. Due to the high powers involved and the need to radiate a broad spectrum of frequencies, Sandia has concentrated on TEM horn antennas. Several TEM horns have been built and used during this program. In those cases where higher gains are desired for the higher frequencies, TEM horn-fed dish antennas have been employed. A detailed overview of the UWB Transmitters along with measured radiated electric field strengths will be presented.

  19. COMPACT MICROSTRIP-FED ANTENNA FOR ULTRA-WIDEBAND APPLICATIONS

    Microsoft Academic Search

    Xin Zhang; Yu-Yin Xia; Jie Chen; Wen-Tao Li

    2009-01-01

    Abstract—A novel printed monopole,antenna for ultra-wideband (UWB) applications is presented, which is composed of wide slot and Y-shaped microstrip feed line with a pair of inverted-L-shaped notches. The prototype with an overall size of 26 mm,× 30 mm,× 2 mm,achieves good impedance matching, constant gain, stable radiation patterns, and a relative impedance bandwidth of 110.6% is achieved, which covers 3.09–10.74

  20. Design of diversity antenna for ultra-wideband applications

    Microsoft Academic Search

    Feng Zhou; Zuping Qian; Tingting Liu; Jiwei Han; Chuan Peng

    2010-01-01

    A printed ultra-wideband (UWB) antenna operating at the frequency range of 2.9-11.0 GHz is proposed for diversity applications. By adopting two symmetrical P-shaped radiators, the antenna presents wideband impedance matching characteristic. The antenna can achieve good impedance matching and improved isolation by notching a slot at the upper centre portion of the ground plane and inserting a stub in the

  1. A new quasi - isotropic antenna for ultra - wideband application

    Microsoft Academic Search

    E. S. Pires; G. Fontgalland; M. A. B. de Melo; R. M. Valle; G. F. Aragao; T. P. Vuong

    2007-01-01

    In this paper, we propose a new compact antenna design for applications where an ultra-wideband (UWB) frequency range is needed. The main features of the proposed antenna is the capability of generate a quasi-isotropic radiation pattern. For this case, the proposed antenna is designed to operate from 2.17 GHz to 2.68 GHz. The construction details of the conceived antenna are

  2. Joint Time-Frequency Analysis of Ultra Wideband Radar Signals

    Microsoft Academic Search

    Hoi-Shun Lui; Nicholas V. Z. Shuley

    The time variant nature of an Ultra-Wideband (UWB) radar signal scattered from a radar target is well described throughout the literature. To study the behaviour of these transient signals, Joint Time-Frequency (TF) analysis is considered. Various Time-Frequency Distributions (TFDs) have been developed in the signal processing area over the last twenty years but little work has been done in a

  3. A novel auto-reference ultra-wideband receiver scheme

    Microsoft Academic Search

    Xuewen Liao; Shihua Zhu; Erlin Zeng

    2007-01-01

    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

  4. UWB radio module design for wireless sensor networks

    Microsoft Academic Search

    Meigen Shen; Tero Koivisto; Teemu Peltonen; Li-Rong Zheng; Esa Tjukanoff; H. Tenhunerf

    2005-01-01

    In this paper, we have designed an impulse-based ultra wideband (UWB) radio module for wireless sensor networks (WSN) applications. The UWB radio module includes transceiver block, baseband process unit and power management block. The transceiver block includes Gaussian pulse generator, wideband low noise amplifier (LNA), multiplier, integrator and timing circuits, which use 0.18?m, 1P6M CMOS technology. The wideband LNA has

  5. Impact of Multipath Interference on the Performance of an UWB Fast Acquisition System for Ranging in an Indoor Wireless Channel

    Microsoft Academic Search

    Yassine Salih Alj; Charles L. Despins; Sofiène Affes

    2008-01-01

    In this paper, the effects of multipath interferences on the performance of a multiuser ultra-wideband (UWB) fast acquisition system operating in an underground indoor fading channel are evaluated and compared. Various pulse shapes are considered with different scenarios of interference and Gaussian noise in extensive Monte-Carlo simulations. The results show the 6 order Gaussian derivative as the most suitable pulse

  6. Optimal MISO UWB Pre-Equalizer Design with Spectral Mask Constraints

    E-print Network

    Mohsenian-Rad, Hamed

    for multiple-input single-output (MISO) direct-sequence ultra-wideband (DS-UWB) systems with pre-Rake combining-- Multiple antennas, ultra-wideband communi- cation, pre-equalization, pre-Rake combining, spectral mask constraints, semi-definite programming. I. INTRODUCTION Ultra-wideband (UWB) is an emerging spectral underlay

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

    Microsoft Academic Search

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

    2003-01-01

    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

  8. Multiuser detection for DS-CDMA UWB in the home environment

    Microsoft Academic Search

    Qinghua Li; Leslie A. Rusch

    2002-01-01

    We demonstrate the effectiveness of multiuser detection for an ultra-wideband (UWB) pulse based direct sequence spread spectrum system using code division multiple access. Extensive simulations were run using channel soundings of the 2-8 GHz band collected in a residential setting and characterized by a high level of multipath fragmentation. We show that the adaptive minimum mean square error (MMSE) multiuser

  9. Low complexity UWB circuit transceiver architecture for low cost sensor tag systems

    Microsoft Academic Search

    Lucian-Vasile Stoica; Sakari Tiuraniemi; Heikki Repo; Alberto Rabbachin; Ian Oppermann

    2004-01-01

    The paper presents the architecture of a low power, low complexity ultra wideband (UWB) transceiver circuit. The circuit is designed for low data rate, low cost applications with built in location and tracking capabilities. The system is based on a non-coherent architecture which enables the receiver to be extremely simple and largely insensitive to the transmitted pulse shape. The circuit

  10. Compact Ultra-Wideband Antenna for Portable Devices

    NASA Astrophysics Data System (ADS)

    Kasi, B.; Ping, L. C.; Chakrabarty, C. K.

    2013-06-01

    This article presents a compact ultra-wideband (UWB) antenna for wireless dongle devices. The printed monopole antenna, with the size of 15 mm × 30 mm, has an impedance bandwidth ranges from 2.9 to 13 GHz. The proposed structure comprises of a hexagonal radiator fed by a microstrip line with a modified ground plane. Such a design can be easily integrated with wireless universal serial bus (USB) devices. Having stable radiation patterns and constant gain within the UWB spectrum are significant characteristics of this antenna. The time domain studies on the designed antenna indicate reduced ringing effect for impulse excitation across the band of interest.

  11. UCom: Ultra-wideband Communications in Harsh Propagation Environments

    SciTech Connect

    Nekoogar, F

    2007-03-14

    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.

  12. LCR with a Traveling Wave Pulse Generator

    Microsoft Academic Search

    G. P. Pochanin; P. V. Kholod

    2006-01-01

    The work is devoted to investigations aiming at developing Harmuth's large current radiator, which radiates effectively electromagnetic field ultra wideband (UWB) pulses. The radiator driven by the traveling wave pulse generator that replaces a return loop has been examined. The spatial dependence of parameters of radiated filed pulses of LCR with a reflector has been investigated

  13. FDTD simulation tools for UWB antenna analysis.

    SciTech Connect

    Brocato, Robert Wesley

    2004-12-01

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

  14. FDTD simulation tools for UWB antenna analysis.

    SciTech Connect

    Brocato, Robert Wesley

    2005-02-01

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

  15. The Marx generator as an ultra wideband source

    Microsoft Academic Search

    J. R. Mayes; W. J. Carey; W. C. Nunnally; L. Altgilbers

    2001-01-01

    Summary form only given. Traditional uses of the Marx generator have been limited to energy storage and delivery systems, such as charging capacitors or pulse forming lines. However, low energy, high peak power Marx generators are finding applications in Ultra Wideband radar and high power microwave systems. This paper presents the results of a new compact, high powered Marx generator

  16. The Marx generator as an ultra wideband source

    Microsoft Academic Search

    J. R. Mayes; W. J. Carey; W. C. Nunnally; L. Altgilbers

    2001-01-01

    Traditional uses of the Marx generator have been limited to energy storage and delivery systems, such as charging capacitors or pulse forming lines. However, low energy, high peak power Marx generators are finding applications in ultra wideband radar and high power microwave systems. This paper discusses the compact generator as well as an assortment of impulse antennas. Experimental results, including

  17. Ultra-wideband digital baseband

    E-print Network

    Blázquez-Fernández, Raúl, 1975-

    2006-01-01

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

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

    Microsoft Academic Search

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

    2007-01-01

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

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

    Microsoft Academic Search

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

    2005-01-01

    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

  20. Determination of the impulse response of UWB antennas using GTEM cells

    Microsoft Academic Search

    Sebastian Sczyslo; Holger Thye; Gunnar Armbrecht; Sven Dortmund; Thomas Kaiser

    2009-01-01

    This paper deals with a measurement method to determine the absolute impulse response of ultra-wideband (UWB) antennas. At this the antenna is placed into the testing volume of a gigahertz transverse electromagnetic (GTEM) cell, augmenting the use-case of this well-known EMC measurement device. The unit consisting of cell and antenna is excited by an UWB pulse. The chief attraction is

  1. Architecture of an ultra wideband wireless body area network for medical applications

    Microsoft Academic Search

    Raúl Chávez-Santiago; Ali Khaleghi; Ilangko Balasingham; Tor A. Ramstad

    2009-01-01

    The utilization of wireless technology in traditional medical services provides patients with enhanced mobility. This has a positive effect on the recovery speed of a patient after major surgical procedures or prolonged illness. This paper presents the architecture of a healthcare wireless network that exploits the capabilities of ultra wideband technology (UWB) for medical sensing and in-body tracking and imaging.

  2. A novel orthogonal linearly polarized directional antenna for ultra wideband applications

    Microsoft Academic Search

    Abdelhalim Mohamed; Lotfollah Shafai

    2010-01-01

    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

  3. Planar antennas in LTCC technology with transceiver integration capability for ultra-wideband applications

    Microsoft Academic Search

    Grzegorz Brzezina; Langis Roy; Leonard MacEachern

    2006-01-01

    We present two novel ultra-wideband (UWB) antennas embedded in a low-temperature co-fired ceramic (LTCC) package designed to house the UWB transceiver chip. Given their planar topology, circuit integration possibilities, and compact size, a partial ground-plane triangular monopole antenna (PGP-TM) and an antipodal Vivaldi antenna (AVA) are fully characterized. The performance in both the frequency and time domain are presented. The

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

    Microsoft Academic Search

    Jeff Foerster; Evan Green; Srinivasa Somayazulu; David Leeper

    2001-01-01

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

  5. Ultra-wideband data transmission with double spectral processing of noise waveforms

    Microsoft Academic Search

    V. I. Kalinin

    2005-01-01

    The process of ultra-wideband (UWB) data transmission with double spectral processing of noise waveforms is considered. A\\u000a new method of code spectral modulation based on the interference of perfectly incoherent noise waveforms is proposed. The\\u000a possibility of compressing UWB noise waveforms by means of real-time double spectral processing with subsequent extraction\\u000a of transmitted data has been experimentally demonstrated.

  6. Planar printed monopole antennas for ultra-wideband\\/multi-band wireless systems

    Microsoft Academic Search

    Chao Deng; Lu Li; Qingge Gong; Dianfu Zhan; Yongxing Zou

    2011-01-01

    An ultra-wideband (UWB) antenna with band rejection of WLAN\\/WiMAX systems and a tri-band antenna for WLAN\\/WiMAX applications are, respectively, proposed by the band-rejected design of the coplanar waveguide (CPW) fed circular monopole antenna. In order to notch the frequency bands covered by WLAN and WiMAX, two pieces of bent slotline are loaded at the patch bottom of the conventional UWB

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

    Microsoft Academic Search

    Liuqing Yang; Zhi Tian; Georgios B. Giannakis

    2003-01-01

    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

  8. Self-Training Algorithms for Ultra-wideband Radar Target Detection

    Microsoft Academic Search

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

    ABSTRACT An ultra-wideband (UWB) synthetic aperture radar (SAR) simulation technique that employs physical and statistical models is developed and presented. This joint physics\\/statistics based technique generates images that have many of the “blob-like” and “spiky” clutter characteristics of UWB radar data in forested regions while avoiding the intensive computations required for the implementation of low-frequency numerical electromagnetic simulation techniques. Approaches

  9. Ultra-wideband bandpass filter with hybrid microstrip\\/CPW structure

    Microsoft Academic Search

    Hang Wang; Lei Zhu; Wolfgang Menzel

    2005-01-01

    A novel ultra-wideband (UWB) bandpass filter (BPF) is presented using the hybrid microstrip and coplanar waveguide (CPW) structure. A CPW nonuniform resonator or multiple-mode resonator (MMR) is constructed to produce its first three resonant modes occurring around the lower end, center, and higher end of the UWB band. Then, a microstrip\\/CPW surface-to-surface coupled line is formed and modeled to allocate

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

    Microsoft Academic Search

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

    2006-01-01

    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

  11. Analog space-time coding for multiantenna ultra-wideband transmissions

    Microsoft Academic Search

    Liuqing Yang; Georgios B. Giannakis

    2004-01-01

    Ultra-wideband (UWB) transmissions have well-doc- umented advantages for low-power, peer-to-peer, and multiple-ac- cess communications. Space-time coding (STC), on the other hand, has gained popularity as an effective means of boosting rates and performance. Existing UWB transmitters rely on a single antenna, while ST coders have mostly focused on digital linearly modulated transmissions. In this paper, we develop ST codes for

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

    SciTech Connect

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

    1992-11-01

    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. ne frequency spectrum of the radiated pulse from these sources include the spectrum of 100-MHz to 3-GHz. Depending upon the source, repetitive operation from single shot to 5-kHz (1-kHz nominal) has been obtained with excellent reliability and repeatability. 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 few tens of kilovolts to 250-kV. EMBL (EnantioMorphic Blumlein) is a similar device (presently under development) which uses a gas switch to sharpen the trailing edge of a 2-nS pulse to approximately 100-pS. To date, an output voltage of approximately 600-kV has been obtained (700- kV is the design goal). Since the frequency spectra are identical between sources with sharpened leading or trailing edges, alternatively, one can use parallel switches to short the pulse at its peak voltage. The pulse is generated externally and then injected into the antenna. Due to the high powers involved and the need to radiate a broad spectrum of frequencies, Sandia has concentrated on TEM horn. antennas with special high voltage feed adapters. Several TEM horns have been built and used during this program. In those cases where higher gains are desired for the higher frequencies, TEM horn-fed, dish antennas have been employed. An overview of the UWB transmitters, including design and operation of the modulators, the PFN`S, the pulse sharpening switches and the antennas will be presented.

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

    SciTech Connect

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

    1992-01-01

    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. ne frequency spectrum of the radiated pulse from these sources include the spectrum of 100-MHz to 3-GHz. Depending upon the source, repetitive operation from single shot to 5-kHz (1-kHz nominal) has been obtained with excellent reliability and repeatability. 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 few tens of kilovolts to 250-kV. EMBL (EnantioMorphic Blumlein) is a similar device (presently under development) which uses a gas switch to sharpen the trailing edge of a 2-nS pulse to approximately 100-pS. To date, an output voltage of approximately 600-kV has been obtained (700- kV is the design goal). Since the frequency spectra are identical between sources with sharpened leading or trailing edges, alternatively, one can use parallel switches to short the pulse at its peak voltage. The pulse is generated externally and then injected into the antenna. Due to the high powers involved and the need to radiate a broad spectrum of frequencies, Sandia has concentrated on TEM horn. antennas with special high voltage feed adapters. Several TEM horns have been built and used during this program. In those cases where higher gains are desired for the higher frequencies, TEM horn-fed, dish antennas have been employed. An overview of the UWB transmitters, including design and operation of the modulators, the PFN'S, the pulse sharpening switches and the antennas will be presented.

  14. High power microwave generation with pulse compression

    Microsoft Academic Search

    A. W. Biggs

    1995-01-01

    Chirped pulse compression is achieved in transmit modes with wideband antennas, such as log periodic dipole arrays (LPDA), where the matched filters are the antennas. In this paper, a modulation technique is described which compresses ultra wideband (UWB) signals on conventional LPDAs. In transmit modes, high power microwaves (HPM) applications are found with wideband transmitting antennas, such as LPDA, where

  15. Modified UWB channel estimation

    Microsoft Academic Search

    Xiangning Fan; Bing Leng; Zaichen Zhang; Guangguo Bi

    2005-01-01

    Ultra wideband (UWB) wireless communication is a new type of radio communication. One of the main applications of UWB in the future focuses on wireless personal area networks (WPAN). Channel estimation is very important for OFDM based UWB system because of its coherent demodulation. In this paper, a new improved channel estimation method is proposed based on the characteristics of

  16. Application of Quasi-Orthogonal Space-Time-Frequency Codes in MB-OFDM UWB

    E-print Network

    Lübeck, Universität zu

    Application of Quasi-Orthogonal Space-Time-Frequency Codes in MB-OFDM UWB L. C. Tran and A. Mertins performance in recently pro- posed Space-Time-Frequency Coded Multiband OFDM Ultra- Wideband (STFC MB-OFDM UWB of the emerging technologies Multiband OFDM Ultra-Wideband (MB-OFDM UWB), Multiple Input Multiple Output (MIMO

  17. A UWB Radio Network Using Multiple Delay Capture Enabled by Time Reversal

    E-print Network

    Qiu, Robert Caiming

    , and Brian M. Sadler Abstract-- An uplink multiple-access method for a centralized ultra-wideband (UWB) radio-access efficiency, time reversal in conjunction with transmitter-side antenna array is considered to shorten the UWB [1] has received attention in ultra- wideband (UWB) radio community [2]-[8]. Time reversal can

  18. Experimental Results on Multiple-Input Single-Output (MISO) Time Reversal for UWB

    E-print Network

    Qiu, Robert Caiming

    with multiple-input single- output (MISO) antennas over ultra-wideband (UWB) channels. In particular, temporal ULtra-wideband (UWB) transmission has recently re- ceived significant attention in both academia and in- dustry for applications in short to medium range wireless communications [1] [2] [3]. UWB techniques have

  19. Differential Space-Time-Frequency Codes for MB-OFDM UWB with Dual Carrier Modulation

    E-print Network

    Lübeck, Universität zu

    - band orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) system, coherent division multiplexing ultra- wideband (MB-OFDM UWB) [1], multiple-input multiple- output (MIMO) and spaceDifferential Space-Time-Frequency Codes for MB-OFDM UWB with Dual Carrier Modulation L. C. Tran

  20. 47 CFR 15.507 - Marketing of UWB equipment.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 15.507 Section 15.507 Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL RADIO FREQUENCY DEVICES Ultra-Wideband Operation § 15.507 Marketing of UWB equipment. In some cases, the operation of UWB devices is limited...

  1. 47 CFR 15.507 - Marketing of UWB equipment.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 15.507 Section 15.507 Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL RADIO FREQUENCY DEVICES Ultra-Wideband Operation § 15.507 Marketing of UWB equipment. In some cases, the operation of UWB devices is limited...

  2. 47 CFR 15.507 - Marketing of UWB equipment.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 15.507 Section 15.507 Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL RADIO FREQUENCY DEVICES Ultra-Wideband Operation § 15.507 Marketing of UWB equipment. In some cases, the operation of UWB devices is limited...

  3. 47 CFR 15.507 - Marketing of UWB equipment.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 15.507 Section 15.507 Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL RADIO FREQUENCY DEVICES Ultra-Wideband Operation § 15.507 Marketing of UWB equipment. In some cases, the operation of UWB devices is limited...

  4. This paper describes the system architecture and circuit design constraints for a proposed Ultra-Wideband radio

    E-print Network

    Southern California, University of

    in the presence of white noise [8]. Even in the presence of colored noise or narrowband interferers an FIR filter of bandwidth. Reception, after gain and fil- tering, occurs in a bank of A/D converters which capture for imaging applications, at power levels similar to Part 15 [1]. Ultra-Wideband (UWB) radios communicate

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

    Microsoft Academic Search

    Chempaka Mohd Din; Wahidah Mansor; Roslina Mohamad

    2011-01-01

    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

  6. UWB antennas: Design and application

    Microsoft Academic Search

    Zhi Ning Chen

    2007-01-01

    Since FCC released the extremely wide spectrum with emission masks for commercial ultra-wideband (UWB) applications in 2002, much effort of research and development has been paid for the design of UWB antennas for a variety of applications from wireless or wired communications to non-communications such as imaging, location, and radar systems. Many UWB antennas have been developed to cover the

  7. A Schottky barrier diode ultra-wideband amplitude modulation (AM) detector in foundry CMOS technology

    Microsoft Academic Search

    Swaminathan Sankaran; Kenneth KO

    2006-01-01

    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 detector is matched to 50 Omega, from 0-10.3 GHz and 0-1.7 GHz at the input and output, respectively and almost covers the entire

  8. DESIGNS ON CPW-FED APERTURE ANTENNA FOR ULTRA-WIDEBAND APPLICATIONS

    Microsoft Academic Search

    Zhong Li; X. Zhang; Guang-Ming Wang; Wen-Ran Su

    2008-01-01

    A novel co-planar waveguide (CPW) ultra-wideband (UWB) aperture antenna is presented. The antenna consists of a rectangular aperture on a printed circuit board ground plane and a mushroom-shaped exciting stub. The mushroom-shaped stub is simple and has less parameter, which is convenient to analyze and optimize. The antenna has a compact aperture size 22 × 13 mm2, fabricated on FR4

  9. Coplanar waveguide-fed dual exponentially tapered slot antennas for ultra-wideband applications

    Microsoft Academic Search

    Yo-Shen Lin; Tzyh-Ghuang Ma; Shyh-Kang Jeng; Chun Hsiung Chen

    2004-01-01

    A uniplanar coplanar waveguide-fed dual exponentially tapered slot antenna is proposed, using a lumped-element impedance-transforming coplanar waveguide-to-slotline transition as the antenna feeding structure. The proposed antenna features a compact size, wide impedance bandwidth, and consistent radiation patterns over the low-band of the ultra-wideband (UWB) spectrum. The characteristics of the proposed antenna, in both the frequency and time domains, are carefully

  10. A Z-shaped band-notched unsymmetric monopole antenna for ultra-wideband application

    Microsoft Academic Search

    Rong Zou; Fu-shun Zhang; Yang Zhu; Kui Dong; Bin Yang

    2010-01-01

    In this article, a simple and printed ultra-wideband (UWB) monopole antenna with band-notched characteristic is presented. The prototype of the proposed antenna is a fan-shaped monopole. By inserting a Z-shaped slot on the radiation element, the 5.5 GHz band-notched characteristic is achieved. Moreover, good radiation patterns and gains within the operating band have been obtained. The detailed design is discussed

  11. Design of a Compact Hexagonal Monopole Antenna for Ultra—Wideband Applications

    Microsoft Academic Search

    Abdo Abdelmonem Shaalan; M. I. Ramadan

    2010-01-01

    This paper presents two design compact hexagonal monopole antennas for ultra-wideband applications. The two antennas are fed\\u000a by a single microstrip line . The Zeland IE3D version 12 is employed for analysis at the frequency band of 4 to 14 GHz which\\u000a has approved as a commercial UWB band. The experimental and simulation results exhibit good agreement together for antenna\\u000a 1.

  12. A dual band-notched antenna for ultra-wideband applications

    Microsoft Academic Search

    Zhen Hong; Yong-Chang Jiao; Bin Yang; Wei Zhang

    2011-01-01

    This paper presents a new design of printed dual band-notched monopole antenna for ultra-wideband(UWB) applications. Printed on the dielectric substrate, the antenna consists of a disc-like radiator and is fed by a microstrip line. By the use of C-shaped slot and U-shaped slot, the dual band-rejected characteristics are obtained successfully. The effects of variation on slots are both investigated in

  13. FMCW ultra-wideband radar for through-the- wall detection of human beings

    Microsoft Academic Search

    Nadia Maaref; Patrick Millot; Christian Pichot; Odile Picon

    2009-01-01

    An FMCW ultra-wideband radar concept for through-the-wall detection of human beings is presented. Propagation modeling through different types of walls and radar cross section measurements of human beings are given. Power budget and dynamic range are computed and discussed for different situations. The realized UWB FM-CW radar is presented and some fast trials of human beings tracking are shown. This

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

    Microsoft Academic Search

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

    2007-01-01

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

  15. Optically addressed ultra-wideband phased antenna array

    NASA Astrophysics Data System (ADS)

    Bai, Jian

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

  16. New method of IEEE 802.15.4a UWB impulse radio spectrum shaping

    Microsoft Academic Search

    Jaroslaw Sadowski; Ryszard J. Katulski

    2011-01-01

    This paper presents a new technique of IEEE 802.15.4a ultra-wideband signal spectrum control, based on changes in sequences of transmitted pulses with very short duration time. Basic parameters of UWB signal and outline of proposed spectrum shaping methods are briefly described. The main part of the paper presents influence of signal and algorithms parameters on the results of spectrum shaping.

  17. Production Test Methods for Measuring 'Out-of-Band' Interference of Ultra Wide Band (UWB) Devices

    Microsoft Academic Search

    Soumendu Bhattacharya; Abhijit Chatterjee

    2005-01-01

    The recent increase in demand within the wireless user community for short-range, very high rate data transmission (data, video) devices has spurred the growth of a new generation of 4G devices, viz. ultra-wideband (UWB). Due to its wide band of operation (3.1-10.6GHz) and non-conventional transmit\\/receive scheme (using short-duration, narrow baseband pulses), spectral power leakage to outside frequency bands causes interference

  18. IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 6, NO. 12, DECEMBER 2007 1 Reduced-Complexity UWB Time-Reversal Techniques and

    E-print Network

    Qiu, Robert Caiming

    reversal technique for ultra-wideband (UWB) communications. Time reversal takes advantage of rich. Index Terms-- Time reversal, ultra-wideband (UWB), autocor- relation correlation demodulation (ACD), and multiple antennas. I. INTRODUCTION STIMULATED by the FCC's move that allows UWB waveforms to overlay over

  19. Ultra-wideband impedance sensor

    DOEpatents

    McEwan, Thomas E. (Livermore, CA)

    1999-01-01

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

  20. Ultra-wideband impedance sensor

    DOEpatents

    McEwan, T.E.

    1999-03-16

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

  1. Ultra-wideband wireless systems

    Microsoft Academic Search

    G. R. Aiello; G. D. Rogerson

    2003-01-01

    The recent FCC frequency allocation for UWB has generated a lot of interest in UWB technologies. There is 7,500 MHz of spectrum for unlicensed use. The main limitations are provided by the low-power spectral density and by the fact that the transmit signal must occupy at least 500 MHz at whole times. IEEE 802.15.3a is being developed for high-bit-rate PAN

  2. Novel Cooperative Communication Schemes for Space-Time-Frequency Coded MB-OFDM UWB

    E-print Network

    Lübeck, Universität zu

    Multi-band OFDM Ultra-Wideband (STFC MB-OFDM UWB) systems. This paper thus proposes two cross], [2] and Space- Time Codes (STCs) [3], [4], [5], to Multi-band OFDM Ultra- Wideband (MB-OFDM UWB) [6 with multiple Rx antennas, and in which scenario this application is useful. The answer for the first question

  3. Printed-Circuit Antennas for 3-30 GHz and 3-60 GHz UWB Applications

    E-print Network

    Bornemann, Jens

    Printed-Circuit Antennas for 3-30 GHz and 3-60 GHz UWB Applications Marjan Mokhtaari and Jens Marjan@uvic.ca Abstract -- New ultra-wideband (UWB) antenna designs in printed-circuit technologies applications [1]. The ultra-wideband antenna is an essential front-end component, and different configurations

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

    PubMed Central

    Rotaru, Mihai; Sykulski, Jan

    2010-01-01

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

  5. A New Family of Space-Time Codes for Pulse Amplitude and Position Modulated UWB Systems

    Microsoft Academic Search

    Chadi Abou-Rjeily; Norbert Daniele; Jean-Claude Belfiore

    2006-01-01

    This paper presents the construction of new totally-real space-time coding schemes suited for carrier-less ultra-wideband transmissions. These schemes are associated with pulse position modulation and with hybrid pulse amplitude and position modulation where the input data is modulated onto both the pulse amplitudes and positions. The new schemes have a uniform average transmitted energy per antenna and achieve full rate

  6. UWB feature localization for imaging

    Microsoft Academic Search

    Jochen Seitz; Markus Schaub; Ole Hirsch; Rudolf Zetik; T. Deissler; R. Thoma; J. Thielecke

    2008-01-01

    Object recognition, localization and imaging capabilities of ultra-wideband signals are demonstrated in this contribution. Resembling a bat, the experimental setup comprises one transmitter and two receivers. Instead of ultrasound, electromagnetic ultra-wideband (UWB) signals are used to recognize and localize features of the surroundings like e.g. walls, edges or corners. Each feature corresponds to a hypothesis on the dominant reflection and

  7. UWB Radio Workshop 11 April 06

    E-print Network

    Southern California, University of

    Range UWB Communications · Bandwidth stresses antenna, analog front end, ADC ­ especially for low power Trans Wireless Comm, March 2006 #12;UWB Workshop 11 April 06 Applications Tagging Low power MTI radar e of micro-systems development #12;UWB Workshop 11 April 06 Discussion · Very vs ultra-wideband ­300 MHz, say

  8. Space-Time-Frequency Coded Multiband UWB Communication Systems

    E-print Network

    Liu, K. J. Ray

    , the application of MIMO scheme to UWB has gained considerable interest recently. To this date, multi-antenna UWB analysis. I. INTRODUCTION Ultra-wideband (UWB) is an emerging technology that offers great promises, research for multi-antenna multiband UWB is still largely unexplored, thus offering limited resources

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

    SciTech Connect

    Nekoogar, F; Dowla, F

    2009-10-19

    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.

  10. Influence of large signal modulation on photonic UWB generation based on electro-optic modulator.

    PubMed

    Gu, Rong; Pan, Shilong; Chen, Xiangfei; Pan, Minghai; Ben, De

    2011-07-01

    Various schemes based on electro-optic modulators have been reported to generate ultra-wideband (UWB) signals in the optical domain, but the availability of these methods always relies on small signal modulation. In this paper, the influence of large signal modulation on two typical schemes, representing two major categories of external-modulator-based photonic UWB generation schemes, is analytically and numerically studied. While the quasi single-sideband UWB (QSSB-UWB) pulse can maintain its shape, the Gaussian UWB (GUWB) generation scheme suffers serious modulation distortion when the phase modulation index is greater than ?/6. The modulation distortion would have negative impact on the receiver sensitivity when the signal is sent to a correlation receiver. PMID:21747524

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

    DOEpatents

    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

    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.

  12. Implementation of a Multiband Pulsed-OFDM Transceiver

    Microsoft Academic Search

    Ebrahim Saberinia; K. C. Chang; Gerald E. Sobelman; Ahmed H. Tewfik

    2006-01-01

    A multi-band orthogonal frequency division multiplexing (OFDM) ultra wideband (UWB) system is being considered for the IEEE\\u000a 802.15.3a wireless personal area networks. An enhancement to this system, named pulsed-OFDM, has been proposed to reduce the\\u000a complexity and power consumption of the transceiver without sacrificing performance. In this paper, we describe a detailed\\u000a implementation of a pulsed-OFDM transceiver. The main focus

  13. Channel estimation for ultra-wideband communications

    Microsoft Academic Search

    Vincenzo Lottici; A. D'Andrea; U. Mengali

    2002-01-01

    This paper deals with channel estimation in ultra-wideband communications operating in a multipath environment and in the presence of multiaccess interference. The channel parameters are the attenuations and delays incurred by the signal echoes along the propagation paths. Time-hopping modulation with binary symbols is assumed. The estimation method is based on the maximum-likelihood criterion and is applied to two different

  14. Experimental implant communication of high data rate video using an ultra wideband radio link.

    PubMed

    Chávez-Santiago, Raúl; Balasingham, Ilangko; Bergsland, Jacob; Zahid, Wasim; Takizawa, Kenichi; Miura, Ryu; Li, Huan-Bang

    2013-01-01

    Ultra wideband (UWB) is one of the radio technologies adopted by the IEEE 802.15.6™-2012 standard for on-body communication in body area networks (BANs). However, a number of simulation-based studies suggest the feasibility of using UWB for high data rate implant communication too. This paper presents an experimental verification of said predictions. We carried out radio transmissions of H.264/1280×720 pixels video at 80 Mbps through a UWB multiband orthogonal frequency division multiplexing (MB-OFDM) interface in a porcine chirurgical model. The results demonstrated successful transmission up to a maximum depth of 30 mm in the abdomen and 33 mm in the thorax within the 4.2-4.8 GHz frequency band. PMID:24110901

  15. Joint Time/Frequency Analysis and Design of Spiral Antennas and Arrays for Ultra-Wideband Applications

    NASA Astrophysics Data System (ADS)

    Elmansouri, Mohamed Ali

    Ultra-wideband (UWB) systems transmit and receive extremely short pulses, permitting the corresponding antennas to distort their shape. Thus the design of an antenna for a UWB system plays an important role for the reliability and quality of communication. A UWB antenna design coalesces both the determination of conventional frequency domain parameters and the analysis of time domain response into a single overarching system requirement. While the former is needed to ensure system's sensitivity, the later is critical to minimize pulse distortion. Well-designed spiral antennas are known for their almost frequency independent characteristics; thus they are viable candidates for UWB systems from the frequency-domain side. However, due to their fundamental principles of operation, they are dispersive and arguments were made they should not be used for pulsed UWB applications (time-domain side). The presented research unequivocally proves that spiral antennas and various derivatives thereof, including arrays, can be excellent candidates for multi-functional time/frequency domain systems. A complete framework for joint frequency and time domain characterization of planar spiral antennas in UWB communication systems is developed first. By utilizing theory, simulations, and experiments, all essential to the analysis frameworks, the various hypotheses are comprehensively treated and relevant conclusions are established. The dispersion and pulse distortion of the conventional spiral antennas are characterized in the radiation and system modes and conclusions regarding the effects of geometrical parameters such as number of arms, mode of operations, etc., on time- and frequency-domain performance are derived for the first time. A method based on controlling the spiral's growth rate and input pulse shape is demonstrated as an effective approach to reduce the pulse distortion. Theoretical pre-distortion compensation method based on a frequency-dependent delay removal technique is employed and performance enhancement of spiral antennas as pulse radiators is successfully demonstrated. A novel spiral antenna topology, named combined power spiral, is derived from first principles to have simultaneously excellent time- and frequency-domain performances without any auxiliary hardware and/or pre-distortion compensation. The role of the reflective cavity backing on the performance of spiral antennas in time and frequency domains is investigated in order to achieve an efficient unidirectional UWB radiation. Resistively-loaded cavity-backed spirals are designed as a compromise for achieving simultaneously good time and frequency domain performances while maintaining high efficiency over the most of operating bandwidth. The lens loading approach is used as a way to further improve the spiral's gain and reduce the amplitude distortion associated with a typical communication channel. UWB spiral arrays based on the derived good time/frequency two- and four-arm spiral antennas are developed and analyzed in time and frequency domains. Multi-mode capabilities of four-arm spirals are used to engineer a dual-circularly polarized array embodiment. To make these arrays practically more desirable, novel feeding scheme which significantly reduces the beamformer complexity is proposed. Time and frequency scanning capabilities and the advantages of the proposed arrays for UWB communications are also discussed. The results of this thesis can pave the way for the use of spiral antennas in many non-traditional, for spiral antennas, applications across commercial and military sectors.

  16. The GIMLI: A Compact High-Power UWB Radiation Source

    Microsoft Academic Search

    P. Delmote; B. Martin

    2010-01-01

    \\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

  17. Employing Cooperative Diversity for Performance Enhancement in UWB Communication Systems

    E-print Network

    Liu, K. J. Ray

    . Simulation results are shown to validate the theoretical analysis. I. INTRODUCTION Ultra-wideband (UWB]. Nevertheless, it might not be easy to have multiple antennas installed in UWB devices. Recently, cooperativeEmploying Cooperative Diversity for Performance Enhancement in UWB Communication Systems W. Pam

  18. Study of a Differential - Fed UWB Antenna

    Microsoft Academic Search

    E. Pancera

    2007-01-01

    This article introduces a study of tapered slot antennas with ultra wideband applications. The contribute of this work is double. Firstly, a novel low profile, planar UWB antenna has been presented. Secondly, from this design, a novel differential -fed UWB antenna has been developed. The possibility of having a differential feeding structure is very useful since it permits to simplify

  19. Very small UWB antenna for WBAN applications

    Microsoft Academic Search

    Kamya Yekeh Yazdandoost; Kiyoshi Hamaguchi

    2011-01-01

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

  20. Pervasive UWB Sensor Networks for Oil exploration

    E-print Network

    Savazzi, Stefano

    Pervasive UWB Sensor Networks for Oil exploration S. Savazzi1, L. Goratti2, D. Fontanella1,3, M)@elet.polimi.it, leonardo.goratti@jrc.ec.europa.eu, diana.fontanella@unibw.de Abstract-- Ultra-wideband (UWB) technology network applications. One of these applications is represented by land seismic exploration for oil and gas

  1. AN INTEGRATED, LOW POWER, ULTRA-WIDEBAND TRANSCEIVER ARCHITECTURE FOR LOW-RATE, INDOOR WIRELESS SYSTEMS

    Microsoft Academic Search

    Ian D. O'Donnell; Mike S. W. Chen; Stanley B. T. Wang; Robert W. Brodersen

    This paper describes the system architecture and circuit design constraints for a proposed Ultra-Wideband radio transceiver. Targeting a sensor network application, the radio supports peer-to-peer communication at greater than 100kbps over 5 meters with a 1mW total (TX+RX) power budget. A narrow pulse (approximately 1ns wide) is trans- mitted using simple digital switches; spreading the energy over a Gigahertz of

  2. Low Power Digital Baseband for Impulse Radio Ultra-Wideband Transceiver

    Microsoft Academic Search

    Wei Da Toh; Yuanjin Zheng; Chun-Huat Heng

    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

  3. A 3.1 to 10.6 GHz 100 Mb\\/s Pulse-Based Ultra-Wideband Radio Receiver Chipset

    Microsoft Academic Search

    F. S. Lee; R. Blazquez; B. P. Ginsburg; J. D. Powell; M. Scharfstein; D. D. Wentzloff; A. P. Chandrakasan

    2006-01-01

    A complete 3.1-10.6 GHz ultra-wide band receiver using 500 MHz-wide sub-banded binary phase shift keyed (BPSK) pulses has been specified, designed and integrated as a three chip and planar antenna solution. The system includes a custom designed 3.1-10.6 GHz planar antenna, direct-conversion RF front-end, 500 MS\\/s analog to digital converters, and a parallelized digital back-end for signal detection and demodulation.

  4. Impulse transmitting photonic antenna for ultra-wideband applications

    Microsoft Academic Search

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

    2010-01-01

    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.

  5. 47 CFR 15.517 - Technical requirements for indoor UWB systems.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 15.517 Section 15.517 Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL RADIO FREQUENCY DEVICES Ultra-Wideband Operation § 15.517 Technical requirements for indoor UWB systems. (a) Operation under the...

  6. 47 CFR 15.517 - Technical requirements for indoor UWB systems.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 15.517 Section 15.517 Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL RADIO FREQUENCY DEVICES Ultra-Wideband Operation § 15.517 Technical requirements for indoor UWB systems. (a) Operation under the...

  7. 47 CFR 15.517 - Technical requirements for indoor UWB systems.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 15.517 Section 15.517 Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL RADIO FREQUENCY DEVICES Ultra-Wideband Operation § 15.517 Technical requirements for indoor UWB systems. (a) Operation under the...

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

    NASA Technical Reports Server (NTRS)

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

    2010-01-01

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

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

    NASA Astrophysics Data System (ADS)

    Yamamoto, H.; Kobayashi, T.

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

  10. A Fully Integrated CMOS Transmitter for Ultra-wideband Applications

    Microsoft Academic Search

    Tao Yuan; Yuanjin Zheng; Chyuen-Wei Ang; Le-Wei Li

    2007-01-01

    In this paper, a fully integrated CMOS UWB transmitter is presented. The transmitter consists of a band-notched UWB antenna and a transmitter IC which integrates a pulse generator, a gating signal generator and driver amplifiers. The drive amplifier employs a 2-stage amplifier-a class-E amplifier and a class-A amplifier with switch control, to significantly reduce power consumption. Fabricated using a 0.18-mum

  11. UWB Pulse Shaping under Spectral and Synchronization Issues

    Microsoft Academic Search

    Enzo Baccarelli; Mauro Biagi; Cristian Pelizzoni; Nicola Cordeschi

    2008-01-01

    Ultra wide band (UWB) systems induce interference on communication systems operating at range frequency from 0 to 10.6 GHz. This is the reason leading to an accurate choice of the pulse shape in order to avoid severe interference and to respect systems coexistence. FCC and ETSI gave indications about the spectral limits to be respected, so, in this regard, the

  12. A reconfigurable pulsed UWB receiver sampling below Nyquist rate

    Microsoft Academic Search

    Yves Vanderperren; Geert Leus; Wim Dehaene

    2008-01-01

    This paper presents a flexible pulsed UWB receiver sampling below Nyquist rate which can trade power consumption for demodulation performance and transmission speed. The system is based on a complex Singular Value Decomposition which is implemented on a configurable systolic array of simple processors. The area cost of the receiver is estimated to 2 MGates.

  13. Ultra-wideband CMOS-MEMS radio

    Microsoft Academic Search

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

    2009-01-01

    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

  14. UWB antennas with enhanced performances (invited)

    Microsoft Academic Search

    Zhi Ning Chen

    2008-01-01

    This paper updates the latest progress in research and development (R&D) of ultra-wideband (UWB) antennas in Institute for Infocomm Research (I2R), Singapore in 2007. All projects aim to enhance the performance of UWB antennas for specific applications besides the basic design considerations such as broadband impedance response and small size. First, the UWB antenna with diversity performance is briefly introduced

  15. The Multi-Cross UWB Antenna

    Microsoft Academic Search

    Guan-Yu Chen; Sheng-Yi Huang; Jwo-Shiun Sun; Shuang-Yuan Chen

    This paper proposes an omni-directional UWB antenna pattern in azimuth cut, low voltage standing wave ratio (VSWR), and easy to construct antenna for ultra wideband (UWB) systems. The designed antenna uses the multi circular blade configuration with a radiating element and on two different ground planes (square and circular ground shape). The multi-circular blades UWB antenna suitable for IEEE 802.15.3a

  16. Characteristics of UWB antenna and wave propagation

    Microsoft Academic Search

    Guan-Yu Chen; Jwo-Shiun Sun; Sheng-Yi Huang; Y. D. Chen; Cheng-Hung Lin

    2005-01-01

    This paper proposes an omni-directional UWB antenna pattern in azimuth cut, low voltage standing wave ratio (VSWR), and easy to construct antenna for ultra wideband (UWB) systems. The designed antenna uses the multi circular blade configuration with a radiating element and on two different ground planes (square and circular ground shape). The multi-circular blades UWB antenna suitable for IEEE 802.15.3a

  17. Research and development of planar UWB antennas

    Microsoft Academic Search

    Zhi Ning Chen; Xianming Qing

    2005-01-01

    This paper addresses the advanced progress in research and development of planar antennas for promising ultra-wideband (UWB) applications within 3.1 GHz-10.6 GHz. The special design considerations for UWB antennas are introduced first. Secondly, newly developed omnidirectional designs, especially the antennas on PCBs are reviewed. Thirdly, the characteristics of a directional modified antipodal tapered slot antenna are shown for UWB applications.

  18. UWB Antennas: From Hype, Promise to Reality

    Microsoft Academic Search

    Zhi Ning Chen

    2007-01-01

    Five years have passed since federal communications commission (FCC) announced the emission mask for commercial ultra-wideband (UWB) applications in April 2002. In the past 5 years, UWB technology in particular high data-rate wireless communications has made a big progress. With such a rapid development, the UWB antenna R&D has also evolved fast from theoretical study to engineering design as well

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

    NASA Astrophysics Data System (ADS)

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

    2013-06-01

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

  20. Simulation Study of Ultra-Wideband Communication System Tefera Tibebe

    E-print Network

    Haddadi, Hamed

    & Electrical Engineering University College London Abstract: This paper provides a brief overview of one by pulsed emissions, where a very wide RF bandwidth is related to a narrow pulse width. Unlike many conventional radio transmitters in which a modulated signal is upconverted & amplified, in UWB systems

  1. Robust Design of Widely Linear Pre-Equalization Filters for Pre-Rake UWB Systems

    E-print Network

    Lampe, Lutz

    Email: {zahraa, Lampe}@ece.ubc.ca Abstract--Pre-rake ultra-wideband (UWB) systems are appeal- ing for UWB communications applications which include devices with different processing capabilities so-equalization, multiple-antenna, and multi-user interference processing. All these design approaches for pre-rake UWB

  2. Energy Efficient Pulsed-UWB CMOS Circuits and Systems

    Microsoft Academic Search

    David D. Wentzloff; Fred S. Lee; Denis C. Daly; Manish Bhardwaj; Patrick P. Mercier; Anantha P. Chandrakasan

    2007-01-01

    A custom UWB transceiver chipset is presented that communicates in three 550 MHz-wide channels in the 3.1 to 5 GHz band by using pulse position modulation (PPM). The transmitter uses an all-digital architecture and calibration technique to synthesize pulses with programmable width and center frequency. No analog bias currents or RF oscillators are required in the transmitter. The receiver performs

  3. An oversampled channelized UWB receiver with transmitted reference modulation

    Microsoft Academic Search

    Lei Feng; Won Namgoong

    2006-01-01

    To digitize the ultra-wideband (UWB) signal at its Nyquist rate, a frequency channelized receiver for UWB radio based on hybrid filter banks (HFB) is presented. Among the challenges of such receivers are the uncertainties of the analog analysis filters and the slow convergence speed. To overcome these problems, a channelized receiver operating at slightly above the critically sampling rate is

  4. An adaptive maximally decimated channelized UWB receiver with cyclic prefix

    Microsoft Academic Search

    Lei Feng; Won Namgoong

    2005-01-01

    The frequency channelized receiver based on hybrid filter bank is a promising receiver structure for ultra-wideband (UWB) radio because of its relaxed circuit requirements and robustness to narrowband interference. Maximally decimated channelizer requires the fewest number of ADCs, but it suffers from poor convergence speed, making it ill-suited for UWB systems. By applying cyclic prefix (CP) to the transmitted data,

  5. A facility for UWB antenna measurements in time domain

    Microsoft Academic Search

    A. A. Lestari; A. B. Suksmono; A. Kurniawan; E. Bharata; A. G. Yarovoy; L. P. Ligthart

    2005-01-01

    The IRCTR, Delft University of Technology (TU Delft), Netherlands, and the Bandung Institute of Technology (ITB), Indonesia, have been collaborating in a research project on the development of ultra-wideband (UWB) antennas for ground penetrating radar (GPR) applications. In the research, a facility for UWB antenna measurements in the time domain is needed. The paper describes such a facility which has

  6. Workshop WS1: UWB technology: components, systems and architectures

    Microsoft Academic Search

    Zhi Ning Chen; M. Y. W. Chia; R. J. Fontana; A. H. Tewfik; R. A. Scholtz; N. K. Askar; H. Arslan; I. Oppermann; Won Namgoong; T. Kaiser

    2004-01-01

    Summary: The new allocation of extremely wide frequency ranges has greatly promoted the commercial applications of Ultra Wideband (UWB) technology in communications, radar, and localization. In an UWB system, the transmission of digital data at very high rates and with very low power over a very wide frequency band will raise many issues in component, system, and architecture levels. This

  7. UWB medical diagnostic: in-body transmission modeling and applications

    Microsoft Academic Search

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

    2011-01-01

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

  8. UWB Real-time testbed with waveform-based precoding

    Microsoft Academic Search

    Nan Guo; John Q. Zhang; Peng Zhang; Zhen Hu; Yu Song; Robert C. Qiu

    2008-01-01

    This paper reports recent progress in ultra-wideband (UWB) radio testbed design and development. Experimental radio testbeds are ideal means to verify theoretically ideas, test feasibility, and reduce the uncertainty between theoretical expectation and practical implementation. The testbed under development has been designed as a general experimental platform to explore the advanced radio technologies, such as UWB based communications as well

  9. Transmission and Reception by Ultra-Wideband (UWB) Antennas

    Microsoft Academic Search

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

    2006-01-01

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

  10. Ultra-Wideband Direct Conversion Receivers for Satellite On-Board Processing

    E-print Network

    Göckler, Heinz G.

    1 Ultra-Wideband Direct Conversion Receivers for Satellite On-Board Processing ­ System Analysis- tigation of performance degradation in conjunction with the processing of ultra-wideband frequency division, a typical error scenario taken from an ultra-wideband application in satellite communica- tions has been

  11. Measurements of MIMO-UWB Indoor Channel G Tsao, P Iyamu, L Petropoulakis, R Atkinson, I Andonovic, I A Glover

    E-print Network

    Atkinson, Robert C

    identical UWB, horizontally-polarized, antennas and a portable terminal for desk-top use with between two and four (also identical) horizontally-polarized antennas. The maximum MIMO-UWB channel capacities such as multimedia streaming within the home environment continues to increase [1]. Ultra-wideband (UWB) and Multiple

  12. Modeling Omnidirectional Small Antennas for UWB Applications Stanley Bo-Ting Wang*, Ali M. Niknejad and Robert W. Brodersen

    E-print Network

    Southern California, University of

    Modeling Omnidirectional Small Antennas for UWB Applications Stanley Bo-Ting Wang*, Ali M. Niknejad}@eecs.berkeley.edu ABSTRACT Small antennas are candidates for indoor UWB communication systems operating below 1GHz due. INTRODUCTION The FCC recently allowed the use of ultra-wideband technology (UWB) transmission in several

  13. UWB module with antenna using organic substrates

    Microsoft Academic Search

    Koichiro Gomi; Masaaki Ishida; Shigeru Hiura

    2005-01-01

    This paper presents the ultra wideband (UWB) module which contains an antenna, switches and a low noise amplifier (LNA). In order to accomplish small size and low cost, the antenna is designed using organic substrates and other parts are fabricated on the same printed circuit board (PCB) as the antenna. Size of the antenna is 20 mm × 15 mm

  14. UWB module with antenna using organic substrates

    Microsoft Academic Search

    Koichiro Gomi; Masaaki Ishida; Shigeru Hiura

    2005-01-01

    This paper presents the ultra wideband (UWB) module which contains an antenna, switches and a low noise amplifier (LNA). In order to accomplish small size and low cost, the antenna is designed using organic substrates and other parts are fabricated on the same printed circuit board (PCB) as the antenna. Size of the antenna is 20 mm times 15 mm

  15. Evaluation of algorithms for UWB indoor tracking

    Microsoft Academic Search

    Juan Choliz; Angela Hernandez-Solana; Antonio Valdovinos

    2011-01-01

    Ultra-Wideband (UWB) stands out as one of the most promising technologies for the development of indoor location & tracking systems, providing very precise time of arrival measurement and consequently centimeter-level resolution in distance estimation. Once the distances to multiple reference nodes are estimated, several location & tracking algorithms can be used to compute user's position. Position calculation is a widely

  16. An energy-efficient all-digital UWB transmitter employing dual capacitively-coupled pulse-shaping drivers

    E-print Network

    Mercier, Patrick Philip

    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, ...

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

    DOEpatents

    Dowla, Farid U.; Nekoogar, Faranak

    2007-03-20

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

  18. Recent advances in ultra-wideband Raman amplifiers

    Microsoft Academic Search

    S. Namiki; Y. Emori

    2000-01-01

    This talk will review fundamentals of ultra-wideband Raman amplifiers, recent progress of high power pump lasers, and system applications of Raman amplifiers. Pump wavelength determines the gain spectrum of a Raman amplifier. This implies that the gain created by a multi wavelength pumping can have a wideband gain profile, which is approximately described by a linear superposition of each gain

  19. Research of circular disc ultra wideband EMC measuring antenna

    Microsoft Academic Search

    Jinghui Qiu; Lingling Zhong; Bo Sun; Zhang Ning

    2008-01-01

    Electromagnetic compatibility (EMC) measuring antenna can be used for EMC radiation disturbed and noise immunity test. Its bandwidth requirement is relatively high, and the antenna needs to cover a wide frequency range. In this paper, the conventional circular disc ultra wideband antenna was expanding researched, and a new method to increase the high frequency of the circular disc antenna was

  20. Frequency domain detectors for ultra-wideband indoor communications

    Microsoft Academic Search

    Simone Morosi; Tiziano Bianchi

    2006-01-01

    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

  1. Recent Progress in Ultra-Wideband Microwave Breast Cancer Detection

    E-print Network

    Coates, Mark

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

  2. Generation of Arbitrary UWB Waveforms by Spectral Pulse Shaping and Thermally-Controlled Apodized FBGs

    Microsoft Academic Search

    Mohammad Abtahi; Mansour Dastmalchi; Sophie Larochelle; Leslie A. Rusch

    2009-01-01

    We propose and experimentally demonstrate an arbitrary UWB pulse generator. The proposed technique is based on spectral pulse shaping and frequency-to-time conversion. The reconfigurability of this technique comes from changing the apodizaton of a chirped fiber Bragg grating (FBG) using a series of heating elements (HE). By setting the appropriate temperature set to the HEs, any predesigned UWB waveforms can

  3. RFI suppression for ultra wideband radar

    Microsoft Academic Search

    T. Miller; L. Potter; J. McCorkle

    1997-01-01

    An estimate-and-subtract algorithm is presented for the real-time digital suppression of radio frequency interference (RFI) in ultrawideband (UWB) synthetic aperture radar (SAR) systems used for foliage- and ground-penetrating imaging. The algorithm separately processes fixed- and variable-frequency interferers. Excision of estimated targets greatly reduces bias in RFI estimates, thereby reducing target energy loss and sidelobe levels in SAR imagery. Performance is

  4. UWB Spatial-Frequency Channel Characterization

    Microsoft Academic Search

    Wen Zhang; Thushara D. Abhayapala; Jian Zhang

    This paper investigates the spatial-frequency chan- nel characterization of Ultra-wideband (UWB) wireless commu- nication systems. Firstly, a novel frequency dependent UWB channel model is constructed based on the theory of electro- magnetic diffraction mechanism, which causes the field strength to vary with the frequency in each multipath. Secondly, we build a space-frequency model, which includes spatial characteristics such as angular

  5. Ultra wideband for wireless real-time monitoring of neural signals.

    PubMed

    Tarín, Cristina; Traver, Lara; Martí, Paula; Cardona, Narcís

    2009-06-01

    Performance of an ultra wideband (UWB) wireless system for real-time neural signal monitoring is evaluated by comparing spiking characteristics between transmitted and received signals for different experimental set-ups. Spike detection quality is selected as the main spiking characteristic of evaluated signals. Results are presented in receiver-operating characteristics and area-under-the-curve (AUC). In order to assess spike detection quality, a set of artificially generated neural signals is constructed from real neural recordings such that the ground truth is known. Data analysis shows how channel signal-to-noise-ratio (SNR) variation affects AUC in different signal SNR cases. Signals with low SNRs get less affected by reduced channel SNRs than those with higher SNR. Increasing bit error rate modifies spiking characteristics such that an under-estimation of the spiking frequency occurs due to spike losses. For practical application of real-time neural signal monitoring, UWB seems to offer best transmission conditions in a near-body environment. PMID:19340472

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

    PubMed Central

    Thiel, Florian; Kosch, Olaf; Seifert, Frank

    2010-01-01

    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. PMID:22163498

  7. Imaging of Ultra-Wideband Georadar Data

    NASA Astrophysics Data System (ADS)

    ferguson, Robert; Yedlin, Matthew; Pichot, Christian; Dauvignac, Jean-Yves; Fortino, Nicolas; Gaffet, Stéphane

    2013-04-01

    We present a methodology for georadar acquisition and processing that returns superior images of the subsurface for low cost. Georadar data were acquired in March 2011 in the anti-blast tunnel within the Inter-Disciplinary Underground Science & Technology Laboratory at the Laboratoire Souterrain a Bas Bruit (LSBB, http://lsbb.oca.eu), Rustrel, France. The georadar data from LSBB were acquired with an exponentially tapered slot antenna (ETSA) of the Vivaldi type. The ETSA is connected to an Agilent vector network analyzer and it operates between 150 MHz to 2 GHz with a noise floor of -120 dB. One of the most interesting technical aspects of the recordings is the use of both a conventional bistatic recording geometry (the source / receiver offset is about 65 cm) and what we will call a monostatic recording geometry where the emitting antenna is also the receiving antenna. The monostatic (reflection) data and bistatic (transmission) data are recorded complex numbers and each recorded number is a stack of monochromatic wave measurements. This system is reported to have a number of outstanding attributes including long depth of resolution due to it's wide bandwidth. Compared to other systems it has a greater dynamic range plus low distortion, and this is achieved with low-noise, low-loss cables and shielding with ultra-wideband absorbers. The resulting monostatic georadargrams are a true, zero-offset recording geometry, and so zero-offset migration (imaging that is based on the exploding reflector concept) returns a high accuracy image for low cost. To restore reflection attenuation due to the low Q factor associated with georadar, we apply nonstationary, Gabor-domain deconvolution. We find that amplitude attenuation is restored and phase distortion is corrected. The improved accuracy of our methodology is established first through direct comparison of our Gabor-deconvolved data with conventional, stationary deconvolution where we find that the nonstationary result is superior. Then, using a bistatic data set for an imaging comparison, we show that ZOM ( Zero-Offset Migration) applied to the bistatic data introduces spurious reflection imagery in the upper 50 cm, but that PSDM (Pre-Stack Depth Migration) of the bistatic data returns an image that is similar to ZOM of the monostatic data. The bistatic data were acquired coincident with the monostatic acquisition and have a source / receiver offset of 65 cm. Thus, imaging accuracy associated with PSDM is achieved using ZOM at 1/100 the computational cost. In the deeper section of our dataset, we find that the ZOM image using the monostatic data returns a significantly improved image than PSDM of the bistatic data. This is unexpected, but perhaps the difference is a phenomenon that is due to out-of-plane reflections and that 2D PSDM is rightly defocussing out-of-plane energy. We feel that subsequent 3D data acquisition could resolve this difference.

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

    Microsoft Academic Search

    Vipul Jain; Sriramkumar Sundararaman; Payam Heydari

    2009-01-01

    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

  9. Energy-Efficient Low-Complexity CMOS Pulse Generator for Multiband UWB Impulse Radio

    Microsoft Academic Search

    Anh Tuan Phan; Jeongseon Lee; Vladimir Krizhanovskii; Quan Le; Seok-Kyun Han; Sang-Gug Lee

    2008-01-01

    This paper presents an energy-efficient low-complexity pulse-generator design technique for multiband impulse-radio ultrawide-band (IR-UWB) system in 0.18-mum CMOS technology. The short pulses are generated based on the on\\/off switching operation of an oscillator with subband switching functionality, which is mandatory for multiband IR-UWB systems. The relation between the oscillator switching operation and the resulting output pulse envelope, which determines pulse

  10. Study on multiband UWB system via WPMCM in the context of cognitive radio

    Microsoft Academic Search

    Haleh Hosseini; Norsheila Fisal; Sharifah K. Syed-Yusof

    2009-01-01

    Cognitive radio (CR) introduces the opportunistic usage of frequency bands and Orthogonal frequency division multiplexing (OFDM) is a strong candidate for CR design. Ultra wideband (UWB) radio fulfills some of the key cognitive radio requirements. Regarding the power limitations for UWB systems the main challenging issue is the impact of narrowband interference (NBI). Wavelet packet transform (WPT) is a possible

  11. Bandwidth-Efficient OFDM Cooperative Protocol with Applications to UWB Communications

    E-print Network

    Liu, K. J. Ray

    Bandwidth-Efficient OFDM Cooperative Protocol with Applications to UWB Communications W. Pam communications systems, e.g., WLANs as specified by the IEEE 802.11a/g and ultra wideband (UWB) networks, and the performance of the proposed relay-assignment schemes is analyzed. We also investigate the application

  12. Side lobe control of UWB antenna array for real beam radar imaging

    Microsoft Academic Search

    Chao-Hsiang Liao; Powen Hsu; Dau-Chyrh Chang

    2010-01-01

    The ultra wideband (UWB) array waveform is essential to the improving of resolution for microwave imaging. Large antenna arrays provide high angular resolution microwave images. These images are plagued with artifacts caused by high side lobes. Specifically, these artifacts are false targets and target break-up or speckle. In this paper, an UWB comb taper slot antenna array with large element

  13. Effect of Beampattern on Directional Beacon based Position Location Algorithm for UWB Systems

    E-print Network

    Minnesota, University of

    the past three years, there has been an increasing in- terest in ultra wideband (UWB) based communicationEffect of Beampattern on Directional Beacon based Position Location Algorithm for UWB Systems S. F, we aim to evaluate the effect of antenna beampattern on the perfor- mance of directional beacon based

  14. Polarization studies in the UWB radar target response using joint Time-Frequency analysis

    Microsoft Academic Search

    Hoi-Shun Lui; Faisal Aldhubaib; Nicholas V. Z. Shuley

    2007-01-01

    The polarization dependent nature of ultra wideband (UWB) scattering from a radar target is studied using time-frequency (TF) analysis. The UWB frequency responses of the target under linear and circular polarization incidence are studied. The results demonstrate that the Q-factor of the resonant peaks vary as the incident polarization changes, indicating that different layer SEM poles are extracted for different

  15. Switchable UWB pulse generation using a phase modulator and a reconfigurable asymmetric Mach-Zehnder interferometer.

    PubMed

    Pan, Shilong; Yao, Jianping

    2009-01-15

    We propose a new scheme to generate polarity-switchable ultrawideband (UWB) Gaussian pulses in the optical domain by use of a phase modulator and a reconfigurable asymmetric Mach-Zehnder interferometer (AMZI). In the proposed system, an optical carrier is phase modulated by a Gaussian pulse train and then sent to a first-or second-order AMZI. The system is equivalent to a first- or second-order differentiator for the production of Gaussian UWB monocycle or doublet pulses. The polarity of the generated UWB pulses can be switched by adjusting the phase difference between the two interference components in the AMZI. An experiment is performed. Gaussian monocycle and doublet pulses with fractional bandwidths of about 177% and 140% are generated. The polarity switchability of generated UWB pulses is also experimentally confirmed. PMID:19148241

  16. Practical Demonstration of Filterbank Receiver for Ultra-Wideband Radios

    Microsoft Academic Search

    Antonio Mollfulleda; Christian Ibars; Joan Anton Leyva; Lluis Berenguer

    2006-01-01

    In this paper we show that a filterbank receiver architecture for ultra-wideband impulse radio systems is adequate in dense multi-path channels. This approach is derived from a time-frequency representation of the received signal by means of the short time Fourier transform. The receiver consists of an analog section containing bandpass filters followed by a bank of analog-to-digital converters (ADC), while

  17. Printed diversity antenna for Ultra-wideband applications

    Microsoft Academic Search

    Yong Cheng; Wen-jun Lu; Chong-hu Cheng

    2010-01-01

    A printed diversity antenna for Ultra-wideband applications is proposed. The proposed antenna is composed of two elliptical shape monopoles. Two stubs and a slot are introduced to reduce the mutual coupling between the two elements. The antenna has been investigated numerically and experimentally. As the results show that the operation bandwidth of the antenna is from 3.1GHz to 10.6GHz and

  18. Iterative Synchronization of Multiuser Ultra-Wideband Signals

    Microsoft Academic Search

    Ersen Ekrem; Mutlu Koca; Hakan Deliç

    2010-01-01

    In this paper, two novel iterative chip-level synchronization methods, one blind and the other data-aided, are proposed for chip-interleaved time-hopping (TH) ultra-wideband signals that are subject to intersymbol interference (ISI) and multiple access interference (MAI). Both algorithms are soft-input, soft-output devices which receive the a posteriori probability of each chip from the minimum mean-square error (MMSE) filter that suppresses both

  19. On the spectral and power requirements for ultra-wideband transmission

    Microsoft Academic Search

    Hongsan Sheng; Philip Orlik; Alexander M. Haimovich; Leonard J. Cimini; Jinyun Zhang

    2003-01-01

    UWB systems based on impulse radio have the potential to provide very high data rates over short distances. In this paper, a new pulse shape is presented that satisfies the FCC spectral mask. Using this pulse, the link budget is calculated to quantify the relationship between data rate and distance. It is shown that UWB can be a good candidate

  20. An Effective Selective Detection Scheme Based on Pulse Repetition for Noncoherent UWB Systems

    Microsoft Academic Search

    Jaewoon Kim; Sekwon Kim; Youngjin Park; Soonwoo Lee; Yoan Shin

    2008-01-01

    We propose a selective detection scheme based on pulse repetition considering the bit-error rate (BER) performance and complexity of noncoherent ultra-wide-band (UWB) systems. To take system complexity into account, the proposed scheme transmits the UWB signals by simple pulse repetition at the transmitter, like conventional pulse repetition coding (PRC). However, to effectively improve the BER performance, the proposed scheme performs

  1. System development and performance evaluation on detection schemes for UWB-IR implant communications.

    PubMed

    Katsu, Kenta; Anzai, Daisuke; Wang, Jianqing

    2013-01-01

    Ultra wideband-impulse radio (UWB-IR) transmission is one of promising transmission technologies in implant body area networks (BANs). Although some studies have investigated the channel model and communication architecture in implant BANs, no study quantitatively shows the feasibility of UWB-IR communication in the human body with actual developed transceivers at a high data rate. In this paper, we focus on experimental evaluation of the correlation detection (coherent detection) and the energy detection (non-coherent detection) for UWB-IR transmission with multi-pulse position modulation (MPPM). For this purpose, we develop a UWB-IR communication system with MPPM scheme, and experimentally evaluate the transmission performance of the developed systems with the two different detection schemes. In addition to the experimental evaluation, we also theoretically analyze the bit error rate (BER) performance by using Gaussian approximation. From the experimental results, the developed system has achieved a BER of 10(-2) at the propagation loss of 75 dB with a data rate of 2 Mbps in the correlation detection. This result shows the feasibility of reliable UWB-IR communication in actual implant BANs. PMID:24109917

  2. A combined MMSE receiver for high data rate UWB systems

    Microsoft Academic Search

    Lin Zhiwei; B. Premkumar; A. S. Madhukumar

    2004-01-01

    In this paper, an ultra wideband (UWB) receiver is proposed based on optimally combining of multiple minimum mean square error (MMSE) detector outputs. These outputs are obtained by applying shifted observation windows. On one hand, each MMSE detector uses smaller number of taps and can be trained separately. This makes the combined structure suitable for adaptive filter bank implementation and

  3. Support Vector Machines for DS-UWB Channel Equalisation

    Microsoft Academic Search

    Mohamed S. Musbah; Xu Zhu

    2007-01-01

    We propose a novel equalization scheme for the direct sequence (DS) based ultra wideband (UWB) indoor system, utilizing support vector machine (SVMs). SVMs are effective learning technique which gains more consideration in pattern classification. In this work, a bank of SV classifiers are trained by received signal chips in order to extract the subsequent corresponding symbols. Simulation results confirm the

  4. Compact fully textile UWB antenna for monitoring applications

    Microsoft Academic Search

    Mai A. R. Osman; M. K. A. Rahim; M. F. Ali; N. A. Samsuri; M. R. Kamarudin

    2011-01-01

    The inspiration of wearable computing systems describes future electronic systems as an integral part of our everyday clothing. On the other hand, the attractive features of Ultra-wideband (UWB) antennas enhanced the possibilities of providing wider bandwidth and reducing the wearable devices size as well as simplicity of fabrication. According to that, this work aimed to investigate the possibility of designing

  5. Small planar UWB antennas in proximity of human head

    Microsoft Academic Search

    Zhi Ning Chen; Ailian Cai; T. S. P. See; M. Y. W. Chia

    2005-01-01

    The effects of a human head on the performance of a small planar ultra-wideband (UWB) antenna in proximity of the head are investigated. A numerical head model developed by REMCOM is used in the XFDTD software package in the study, where the frequency-dependent dielectric constant and conductivity are obtained from the average data of anatomical human heads. A planar antenna

  6. Small planar UWB antennas in proximity of the human head

    Microsoft Academic Search

    Zhi Ning Chen; Ailian Cai; T. S. P. See; Xianming Qing; M. Y. W. Chia

    2006-01-01

    The effects of a human head on the performance of small planar ultra-wideband (UWB) antennas in proximity of the head are investigated numerically and experimentally. In simulation, a numerical head model is used in the XFDTD software package. The head model developed by REMCOM is with the frequency-dependent dielectric constant and conductivity obtained from the average data of anatomical human

  7. Narrowband interference suppression in multi-band UWB communication systems

    Microsoft Academic Search

    Prasad Yaddanapudi; Dimitrie C. Popescu

    2006-01-01

    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

  8. APPLICATION OF TRM IN THE UWB THROUGH WALL RADAR

    Microsoft Academic Search

    Wenjun Zheng; Zhiqin Zhao; Zai-Ping Nie

    2008-01-01

    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

  9. Characterization of printed UWB antennas in proximity of human head

    Microsoft Academic Search

    Ailian Cai; Zhi Ning Chen

    2005-01-01

    This paper characterizes the ultra-wideband (UWB) antennas in proximity of human head using an FDTD method. In the study, a numerical head model of frequency dependent dielectric constant and conductivity is used. The performance of the antennas printed on PCB is investigated in terms of the impedance matching, radiation patterns, and gain. The information derived from this study is conductive

  10. Channel Uncertainty in Ultra Wideband Communication Systems

    E-print Network

    Tse, David

    not have to be peaky in frequency as well. We analyze direct sequence spread spectrum (DSSS) and pulse for any number of channel paths and 2. direct sequence spread spectrum signals with continuous principle is demonstrated by comparing the channel conditions that allow duty-cycled direct-sequence spread

  11. Channel Uncertainty in Ultra Wideband Communication Systems

    E-print Network

    Southern California, University of

    modulations, M`edard and Gallager [5] show that direct sequence spread spectrum signals, when transmitted analyze direct sequence spread spectrum (DSSS) and pulse position modulation (PPM) signals, and show an infinitely wide bandwidth if they use duty cycle. At the limit of infinite bandwidth, direct sequence spread

  12. Bandwidth Scaling in Ultra Wideband Communication 1

    E-print Network

    Porrat, Dana

    of infinite bandwidth, direct sequence spread spectrum and pulse position modulation sys- tems with duty cycle modulations, Telatar and Tse [5] have shown that direct sequence spread spectrum signals, when transmitted, and the transmitted signal does not have to be peaky in frequency as well. We analyze direct sequence spread spectrum

  13. On the propagation characteristics of ultra-wideband signal in aluminum

    Microsoft Academic Search

    Daniel Piscarreta; Sut Kam Ho; Kam Weng Tam

    2010-01-01

    The UWB reflected signal at 4.7 GHz is characterized and measured for the application of short-circuited reflection material analysis with aluminum backing the sample. The sub-pulse with 120-ps pulse width is used to characterize the UWB reflected wave propagation phenomenon in some aluminum plates with different thickness. It was found the normalized amplitude of principal sub-pulse that is generated by

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

    PubMed Central

    2013-01-01

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

  15. ON THE EFFECT OF ANTENNAS ON UWB SYSTEMS

    Microsoft Academic Search

    Florent Munier; Matts-Ola Wessman; Thomas Eriksson; Arne Svensson

    2004-01-01

    Ultra-wideband (UWB) communication systems are emerging as the most promising solution for high rate, short range wireless communication, with applications in home networking and high quality multimedia content delivery. This technique is being studied in numerous research projects and is the subject of a standardization work within the IEEE 802.15.3a task group. UWB systems are characterised by a radio signal

  16. Design of the UWB antenna using fractal concept

    Microsoft Academic Search

    Wang Peng; Wang Anguo; Dong Jiawei

    2008-01-01

    In this paper a novel barbell-shaped planar antenna for UWB application is proposed. The antenna, composed of two symmetrical fractal patch radiators and partially grounded plane which are used to realize the characteristic of ultra-wideband (UWB), can occupy about 3.95 GHz bandwidth (from 3.45 GHz to 7.40 GHz), which is equivalent to 73%. The symmetrical radiation patterns in the y-z

  17. Low Power UWB Circuits: Front-End Building Blocks

    Microsoft Academic Search

    Tommy Tsang; Kuan-Yu Lin; Karim Allidina; Mourad El-Gamal

    Ultra wideband (UWB) communications is a rapidly developing field that possesses desirable characteristics when compared to\\u000a traditional narrowband systems. These characteristics stem from Shannon's channel capacity formula, which states that the\\u000a capacity of a channel increases linearly with bandwidth and only logarithmically with an increased signal to noise ratio (SNR).\\u000a As such, UWB communications offer both high data-rate communications over

  18. Low-cost PCB antenna for UWB applications

    Microsoft Academic Search

    Z. N. Low; J. H. Cheong; C. L. Law

    2005-01-01

    This letter presents a low-cost knight's helm shape double-sided printed circuit board (PCB) antenna of size 3 cm×3 cm for ultra-wideband (UWB) application. The antenna has a return loss of more than 10 dB, constant group delay and gain flatness over the frequency range set by the Federal Communications Commission (FCC) for UWB application. Satisfactory performance was obtained using FR4

  19. UWB ranging with antenna proximity to the human head

    Microsoft Academic Search

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

    2010-01-01

    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

  20. UWB radio module design for wireless sensor networks

    Microsoft Academic Search

    Majid Baghaei Nejad; Meigen Shen; Tero Koivisto; Teemu Peltonen; Esa Tjukanoff; Hannu Tenhunen; Li-Rong Zheng

    2007-01-01

    In this paper, we describe an impulse-based ultra wideband (UWB) radio system for wireless sensor network (WSN) applications.\\u000a Different architectures have been studied for base station and sensor nodes. The base station node uses coherent UWB architecture\\u000a because of the high performance and good sensitivity requirements. However, to meet complexity, power and cost constraints,\\u000a the sensor module uses a novel

  1. FPGA based UWB MISO time-reversal system design and implementation

    Microsoft Academic Search

    Yu Song; Nan Guo; Zhen Hu; Robert C. Qiu

    2010-01-01

    In this paper, a testbed design and implementation of ultra-wideband (UWB) multiple-input single-output (MISO) time-reversal system are presented. The implementation is based on field programmable gate array (FPGA). The combination of MISO with UWB time-reversal is promising for enhancing the data rate and reliability in harsh wireless environments. When multiple transmitter antennas are considered with UWB time-reversal, the coherency between

  2. A 2.5 Gpulse/s, 25 pJ/pulse, CMOS Impulse Radio UWB Transmitter Based on

    E-print Network

    Wu, Hui

    important for battery-powered IR-UWB systems such as wireless sensor networks. Currently, pulse generationA 2.5 Gpulse/s, 25 pJ/pulse, ¢¡¤£¦¥¨§© CMOS Impulse Radio UWB Transmitter Based on Dual transmitter based on a newly-developed ultrafast pulse circuit technique, distributed waveform generator (DWG

  3. Design of a Pulse Sensor to Detect Medium Activity in UWB Networks

    E-print Network

    Ha, Dong S.

    Design of a Pulse Sensor to Detect Medium Activity in UWB Networks Nathaniel J. August, Hyung for large, multihop ad hoc and sensor networks. In a previous work, we proposed a method, termed pulse sense) in narrowband systems. This paper investigates CMOS RF circuit implementation of a pulse sensor and its system

  4. Land mine detection with an ultra-wideband SAR system

    NASA Astrophysics Data System (ADS)

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

    2002-08-01

    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 distortion. The clutter suppression is based on background subtraction and wavelet transforms. These data are used to obtain SAR ultra wide band images by transient methods. The following discussion describes the device, the experimental results and the signal processing currently utilized. Future development efforts on this system (generator, acquisition means .) are detailed. At the same time a theoretical study is made to estimate target transient responses captured by the system. So a FDTD code is modified to simulate buried objects detection by the radar.

  5. SHORT-RANGE ULTRA-WIDEBAND SYSTEMS Principal Investigator

    E-print Network

    Southern California, University of

    mobile and dense multipath links), antenna design for UWB links, coexistence with interference, energy. We will use short-range UWB radio applications in these environments as one key means of focusing our applications" for UWB technology. This work is supported by good lab facilities at all three participating

  6. A Small UWB Antenna for Wireless USB

    Microsoft Academic Search

    Terence S. P. See; Zhi Ning Chen

    2007-01-01

    A printed ultra-wideband (UWB) antenna operating within a frequency range of 3.1-5 GHz is proposed for wireless USB dongle applications. The antenna consists of a triangular radiating element with a notch at the center and an L-shaped strip extended from the end of the radiator to reduce the antenna size. The ground plane is etched on the reverse side of

  7. All optical ultra-wideband signal generation and transmission using mode-locked laser incorporated with add-drop microring resonator

    NASA Astrophysics Data System (ADS)

    Soltanian, M. R. K.; Amiri, I. S.; Alavi, S. E.; Ahmad, H.

    2015-06-01

    The novel technique for generating the robust, ultra-wideband (UWB) signal in the optical domain using a mode-locked laser incorporated with an add-drop microring resonator filter is presented. In order to enable the down conversion of the UWB signal to the RF domain, two wavelength ranges 1553.72 and 1553.92?nm, which are 24.65?GHz apart from each other, are used. These wavelengths were generated based on a single longitudinal mode (SLM) dual-wavelength fiber laser in a laser ring cavity. The upper wavelength of the generated dual-wavelength laser is modulated with the UWB spectrum using an optical carrier suppression (OCS) scheme and the lower wavelength is kept unmodulated. After beating the modulated and unmodulated wavelength by launching into the photodiode, the 24?GHz UWB signal can be generated to be applied to UWB over fiber (UWBoF) technology. The error vector magnitude (EVM) for the signal transmission was calculated and the EVM below 10% is achieved for 25?Km optical and 20?m wireless links.

  8. A CPW-fed anti-interference UWB antenna using a stepped impedance stub loaded pentagon resonator

    Microsoft Academic Search

    Yingsong Li; Wenxing Li; Si Li; Chengyuan Liu; Tao Jiang

    2012-01-01

    A coplanar waveguide (CPW) fed anti-interference ultra wideband (UWB) antenna is proposed numerically in this paper. The proposed UWB antenna has an anti-interference characteristic which is produced by using stepped impedance stub (SIS) loaded pentagon resonator (PR). The anti-interference function can reduce the potential interference between UWB systems and WLAN systems. The bandwidth of the proposed antenna was enhanced by

  9. Carrier-based UWB impulse radio: simplicity, flexibility, and pulser implementation in 0.18-micron CMOS

    Microsoft Academic Search

    Julien Ryckaert; M. Badaroglu; C. Desset; V. De Heyn; G. ven der Plas; P. Wambacq; B. van Poucke; S. Donnay

    2005-01-01

    Emerging impulse-based ultra-wideband (UWB) technology shows strong advantages for the implementation of low-power transceivers. In this paper we propose a carrier-based UWB system that brings two distinctive advantages over other UWB systems: 1) lower power operation due to the fact that signal processing is optimally partitioned between analog and digital baseband; 2) better spectrum utilization enabling spectrum diversity and multi-user

  10. A differential-fed magneto-electric dipole antenna for ultra-wideband applications

    Microsoft Academic Search

    Mingjian Li; Kwai-Man Luk

    2011-01-01

    an ultra-wideband differential-fed magneto-electric dipole antenna with unidirectional radiation patterns is proposed in this paper. A novel parallel twin-L shaped differential feeding structure provides an ultra-wideband impedance matching. A unified gain can be realized by the modification of the magneto- electric dipole and using a rectangular cavity, instead of a normal ground plane. The antenna can achieve an impedance bandwidth

  11. Compact modified bow-tie slot antenna fed by CPW for ultra-wideband applications

    Microsoft Academic Search

    Chi-Hsuan Lee; Shih-Yuan Chen; Powen Hsu

    2009-01-01

    A coplanar waveguide fed compact modified bow-tie slot antenna is proposed for use in the ultra-wideband systems. The modification is made by attaching a pair of meandered slotlines to the upper ends of the small bow-tie slot. With a proper slotline length, the impedance bandwidth of the proposed antenna can be adjusted to cover the entire ultra-wideband and the antenna

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

    Microsoft Academic Search

    Michael Camp; Heyno Garbe; Daniel Nitsch

    2002-01-01

    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.

  13. IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 4, NO. 6, NOVEMBER 2005 2939 Error Performance of Pulse-Based

    E-print Network

    Qiu, Robert Caiming

    . INTRODUCTION ULTRA-WIDEBAND (UWB) [1]­[8] has attracted signif- icant academic and commercial interest because with additive white Gaussian noise (AWGN) was studied by simulations. In [15], a UWB multiple-antenna]. Major applications of UWB are likely to be for indoor environments for which the channel amplitude

  14. UWB receiver based on filter bank architecture for suppression of narrowband interference noise

    Microsoft Academic Search

    R. Pasand; J. Nielsen; A. Sesay

    2004-01-01

    Ultra wideband (UWB) links are inherently subject to narrowband interference from other communication links which results in frequent disruptive outage conditions. This paper proposes a solution for suppressing the narrowband interference noise based on analog filter bank pre-processing in conjunction with maximum ratio combining (MRC) and generalized matched filter (GMF) processing. This receiver architecture requires significantly less processing than the

  15. Reduced Ground-Plane Effect UWB Antenna and Application for Laptop Computers (Invited)

    Microsoft Academic Search

    Zhi Ning Chen; Terence S. P. See

    2006-01-01

    In this paper, the concept of reduced ground-plane effect is proposed in the design of small ultra-wideband (UWB) antennas for portable devices. The antenna is designed with a notch cut from the radiator, which concentrates most of the electric currents on the upper radiator at lower operating frequencies. A short strip is used to further reduce the size of the

  16. Performance Analysis of a MAP Fine Timing Algorithm in UWB Multiband OFDM

    Microsoft Academic Search

    Christian R. Berger; Shengli Zhou; Zhi Tian; Peter Willett

    2008-01-01

    Precise positioning is one attractive application of ultra wideband (UWB) systems. Its enormous bandwidth has generated high expectation on the spatial resolution that it could achieve. However, synchronization in the presence of dense multipath is challenging, since the first arrival is not necessarily the strongest one due to channel fading. It is unclear how high a spatial resolution can be

  17. Design of high speed low voltage data converters for UWB communication systems 

    E-print Network

    Lee, Choong Hoon

    2006-08-16

    For A/D converters in ultra-wideband (UWB) communication systems, the flash A/D type is commonly used because of its fast speed and simple architecture. However, the number of comparators in a flash A/D converter exponentially ...

  18. Stochastic UWB wireless channel modeling and estimation from received signal measurements

    Microsoft Academic Search

    Yanyan Li; Mohammed Olama; Seddik Djouadi; Aly Fathy; Teja Kuruganti

    2009-01-01

    In this paper, stochastic differential equations (SDEs) are used to model ultra-wideband (UWB) indoor channels. We show that the impulse responses for time-varying wireless channels can be approximated in a mean square sense as close as desired by impulse responses that can be realized by SDEs. The Expected Maximization and Extended Kalman Filter are employed to recursively identify and estimate

  19. Perfect Space-Time Block Codes and Ultra-Wideband

    Microsoft Academic Search

    Kei Hao

    cannot be used in UWB systems, however it was shown that ST codes designed for flat fading channels still provide at least the some advantage even in the presence of frequency-selective fading channels (4). With the objective to give an answer or opinion whether the perfect codes can be used in UWB systems, we proceed as follow. We investigate the

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

    NASA Astrophysics Data System (ADS)

    Gwynne, John Scott

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

  1. Pulse Repetition and Cyclic Prefix: Different Transmitting Strategies for Impulse Radio UWB Systems

    Microsoft Academic Search

    Tiziano Bianchi; Simone Morosi

    2009-01-01

    In this paper, we compare the performance of two different communication techniques for impulse radio ultra- wide-band (UWB) systems, which resort to impulsive modulations. These techniques can be applied in a short-range scenario where a central node synchronously communicates with several peripheral nodes. The first one is based on the pulse repetition according to the spreading factor value, whereas the

  2. Comparison of Pulse Repetition and Cyclic Prefix Communication Techniques for Impulse Radio UWB Systems

    Microsoft Academic Search

    Tiziano Bianchi; Simone Morosi

    2006-01-01

    In this paper, the performance of two different communication techniques for impulse radio UWB systems is compared: the techniques are based on the pulse repetition according to the spreading factor value and the cyclic prefix insertion. Since both techniques cause a throughput loss, they have to be compared both in terms of performance and capacity, i.e. the maximum data rate

  3. UWB Antenna with Improved Efficiency for Pulse Radiation

    Microsoft Academic Search

    Yu-chun Guo; Xiao-wei Shi

    2006-01-01

    One of the most critical hardware components for the performance of the UWB system is the antenna and the resistive loading antenna is one of common antennas used in the system. The author extends Wu-King linear current distribution to the double exponential current distribution and modifies the inaccurate part of the Wu-King loading profile and deduces an improved loading profile

  4. Image Reconstruction Algorithms for UWB Pulse Radar Systems Toru SATOa)

    E-print Network

    Sato, Toru

    in a random medium. [11] Green Leuschen Plumb [12] FDTD FDTD 5. Domain Integral Equation (Ö) = inc(Ö) + k2 0C Rekanos [39] FDTD Sato [38] 8 #12;UWB Otto Chew [40] Otto Chiu [41], [42] F Takenaka [43] FBTS(Forward-Backward Time-Stepping) FBTS FDTD FDTD FDTD FDTD Sato [37], [38] Marquardt Otto [40] Harada [44] Rekanos [39

  5. Multi-band OFDM UWB receiver with narrowband interference suppression 

    E-print Network

    Kelleci, Burak

    2009-05-15

    in the electromagnetic compatibility (EMI) reports submitted to FCC. For example, the EMI report of a local area network card shows emissions of -49.8 dBm at 3.75 GHz [4], which is directly in the UWB band. NBI sources are not limited to computer components, even common... MULTI-BAND OFDM UWB PROPOSAL On February 14, 2002 the FCC opened up 7.5 GHz of spectrum depicted in Fig. 1 (from 3.1 GHz to 10.6 GHz) for ultra-wideband (UWB) communications. The maxi- mum transmit power is restricted to the existing ?41.3 dBm/MHz limit...

  6. Design of a frequency notched UWB antenna using a slot-type SRR

    Microsoft Academic Search

    Cheolbok Kim; Jaesam Jang; Youngho Jung; Hosang Lee; Jaehoon Kim; Mun Soo Lee

    2009-01-01

    In this paper, we propose a new design for a frequency notched ultra-wideband (UWB) antenna with a coplanar waveguide (CPW) bandstop filter using a slot-type split-ring resonator (STSRR). To notch the wireless local area network (WLAN) frequency band, a STSRR resonant at the unwanted frequency is inserted into the center line of the CPW of the UWB antenna. The characteristics

  7. Applicability of Finite Integration Technique for the modelling of UWB channel characterization

    Microsoft Academic Search

    Mariella Sarestoniemi; Tommi Tuovinen; Matti Hamalainen; Kamya Y. Yazdandoost; Emmi Kaivanto; Jari Iinatti

    2012-01-01

    The objective of this paper is to verify applicability of Finite Integration Technique (FIT) based simulations in the modeling of Ultra Wideband (UWB) radio channel. A printed planar UWB monopole antenna, designed for Wireless Body Area Networks' (WBAN) on-body and off-body communications, is used in the experiments. The validation of the FIT-method is performed by comparing the simulation and measurement

  8. Feature based indoor mapping using a bat-type UWB radar

    Microsoft Academic Search

    T. Deissler; J. Thielecke

    2009-01-01

    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

  9. An Impulse Radio UWB hardware demonstrator for Body Area Network communication

    Microsoft Academic Search

    Oliver Lauer; David Barras; Marco Zahner; Jurg Frohlich

    2011-01-01

    An Ultra-Wideband hardware demonstrator based on Impulse Radio for Local Body Area Network applications is presented. The system includes an UWB transmitter, an UWB receiver and a microcontroller board. It operates in the frequency range from 3.1 - 5.0 GHz with a maximum data rate of 10 MBit\\/s. The performance of the system is shown in terms of BER. It

  10. Research on a novel synchronization and detection scheme used in energy detection UWB receiver

    Microsoft Academic Search

    Ying Tang; Yue Ruan

    2011-01-01

    Ultra-wideband (UWB) is a modern radio technology that works at extremely low energy levels. It is popularly used in short-range, low power and low cost communications such as RFIDs. This paper presents a UWB receiver using energy detection scheme with on-off keying (OOK) modulation. A novel synchronization and detection algorithm called energy offset based scheme is investigated and used in

  11. Implementation of an UWB Impulse-Radio Acquisition and Despreading Algorithm on a Low Power ASIP

    Microsoft Academic Search

    Jochem Govers; Jos Huisken; Mladen Berekovic; Olivier Rousseaux; Frank Bouwens; Michael De Nil; Jef L. Van Meerbergen

    2008-01-01

    Impulse Radio-based Ultra-Wideband (UWB) technology is a strong candidate for the implementation of ultra low power air interfaces\\u000a in low data rate sensor networks. A major challenge in UWB receiver design is the low-power implementation of the relatively\\u000a complex digital baseband algorithms that are required for timing acquisition and data demodulation. Silicon Hive offers low-power\\u000a application specific instruction set processor

  12. RF and BaseBand circuit blocks for LR-UWB receivers

    Microsoft Academic Search

    S. D'Amicol; A. Baschirottol; K. Philips; J. Van der Tang; G. Dolmans; T. Fu; O. Rousseaux; H. Pflug; B. Gyselinckx

    2007-01-01

    Low Data Rate Ultra-Wideband (LR-UWB) systems have an enormous potential and compare favorably to other communication systems, in terms of capacity and low-complexity. This stems from the channels located at rather high frequencies (3.5 GHz-10 GHz), which offer each a large signal bandwidth (500MHz). However, these aggressive broadband frequency properties of UWB systems make the design of low-power receivers quite

  13. An Analog\\/Digital Baseband Processor Design of a UWB Channelized Receiver for Transmitted Reference Signals

    Microsoft Academic Search

    Lei Feng; Won Namgoong

    2006-01-01

    The frequency channelized receiver enables the use of practical analog-to-digital converters (ADC) to digitize ultra-wideband (UWB) signals. The design issues of the analog and digital baseband processor for the channelized receiver in a UWB transmitted reference (TR) system are investigated. In the analog part, the receiver performance is shown to be weakly dependent on the analog filter bandwidth, the filter

  14. Time-domain front-end for short time windowing UWB WLAN transform-domain receiver

    Microsoft Academic Search

    Mohamed ZEBDI; Daniel MASSICOTTE; C. J. B. Fayomi

    2009-01-01

    This paper addresses the selectivity problem, for the ultra-wide band (UWB), transform-domain receiver loss of orthogonality. A novel selective time-domain direct-sequence front-end for transform-domain ultra-wideband (UWB) wireless local area network (WLAN) receiver is proposed. The architecture comprises a multi-block, linear, dynamic feedback low-noise amplifier (LNA), quadrature mixer, and baseband filter. The dynamic feedback with inductive output load reduces the LNA

  15. 0.15-nJ\\/b 3–5GHz IR-UWB System With Spectrum Tunable Transmitter and Merged-Correlator Noncoherent Receiver

    Microsoft Academic Search

    Lingli Xia; Ke Shao; Hu Chen; Yumei Huang; Zhiliang Hong; Patrick Y. Chiang

    2011-01-01

    Carrierless impulse radio ultra-wideband (IR-UWB) radios have attracted significant research interest due to their low system complexity and power consumption. Unfortunately, IR-UWB systems suffer from the difficulty in controlling the trans- mitted spectral mask because of process, voltage, and temperature variations. In this paper, a monolithic 3-5-GHz IR-UWB trans- ceiver is presented that integrates both amplitude and spectrum tunability, thereby

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

    PubMed

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

    2013-11-18

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

  17. 2904 JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 31, NO. 17, SEPTEMBER 1, 2013 Wavelength Reuse in a UWB Over Fiber System

    E-print Network

    Yao, Jianping

    (FBG) in an ultra-wideband (UWB) over fiber (UWBoF) system is proposed and experimen- tally demonstrated. In the proposed scheme, a PolM and an FBG in the central station (CS) are used to generate for both downstream and upstream transmissions are measured. Index Terms--Fiber Bragg grating (FBG

  18. A Nonuniform Low Sampling Rate Receiver in UWB Communications

    Microsoft Academic Search

    Xing-Peng Mao; Ke Xu; Bin Cao; Qin-Yu Zhang

    2008-01-01

    Very high analog-to-digital (A\\/D) sampling rate is a key problem to be solved in a ultra-wideband (UWB) communication system. To reduce the A\\/D sampling rate, a novel low sampling rate receiver based on nonuniform sampling in the frequency domain is proposed. The incoming signal is divided into several subchannels, and signals at some subchannels are sampled at nonuniform sampling rates

  19. Planar UWB antenna with single band-notched characteristic

    Microsoft Academic Search

    Paitoon Rakluea; Jintana Nakasuwan

    2010-01-01

    The planar UWB antenna with single band-notched characteristic is proposed. It is designed for Ultra-wideband wireless communications with a notch frequency response in the WLAN bands. The antenna consists of a rectangular slot etched out from the ground plane of a FR4 substrate (dielectric constant = 2.2) and a CPW-fed. The antenna is successfully designed, implemented and measured. The measured

  20. Power Control in UWB Position-Location Networks

    Microsoft Academic Search

    Swaroop Venkatesh; R. Michael Buehrer

    2006-01-01

    In this paper, we discuss the use of power control in Ultra-Wideband (UWB) Position-Location Networks (PoLoNets)1, where the goal is to periodically estimate the locations of mobile nodes that move through a network of location-aware reference nodes. The reference nodes provide Time-of-Arrival (TOA) based range estimates that are used to estimate the locations of mobile nodes at regular intervals. We

  1. An inverted E-shape antenna for UWB applications

    Microsoft Academic Search

    Yuanyuan Guo; Xiaomiao Zhang; Yang Luo; Pu Wan

    2011-01-01

    A novel inverted E-shape with slots antenna for the ultra-wideband (UWB) communication is presented and studied in this paper. The radiation is only printed on an one face of inexpensive FR_4 substrate with the thickness of 1.6 mm, and it is easy to integrate with other systems. The two arms of the inverted E-shape can efficiently extend the current distribution

  2. Ultra-Wideband Optical Modulation Spectrometer (OMS) Development

    NASA Technical Reports Server (NTRS)

    Gardner, Jonathan (Technical Monitor); Tolls, Volker

    2004-01-01

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

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

    PubMed Central

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

    2010-01-01

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

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

    PubMed

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

    2010-01-01

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

  5. Design and development of a small compact ultra wideband antenna

    NASA Astrophysics Data System (ADS)

    Qurratulain; Chattoraj, Neela

    2013-04-01

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

  6. Reduced-complexity ML multi-user detection for dispersive UWB signal based on combined stack and Viterbi trellis search

    Microsoft Academic Search

    Weiyu Xu; Zhenqi Chen; Zihua Guo; Richard Yao

    2004-01-01

    We propose a novel reduced-complexity maximum-likelihood (ML) detector for multi-user impulse radio ultra-wideband (UWB) signals in multi-path channels. By utilizing the unique trellis feature of a multi-user impulse radio UWB signal, and introducing a novel combined stack and Viterbi based trellis search (CSVS) algorithm, the proposed detector is optimal and enjoys much lower computation complexity compared with the brute-force search

  7. A Unitary Space-Time Coding Scheme for UWB Systems and Its Application in Wireless Secure Communications

    Microsoft Academic Search

    Yanbing Zhang; Huaiyu Dai

    2006-01-01

    Recent research reveals that information security and information-hiding capabilities can be enhanced by proper exploitation of space-time techniques. Meanwhile, intrinsic properties of ultra wideband (UWB) signals make it an outstanding candidate for secure applications. In this paper, we propose a unitary space-time coding scheme for impulse radio UWB systems. Its transmission secrecy, including low probability of intercept (LPI), low probability

  8. A novel patch antenna for ultra wideband applications

    Microsoft Academic Search

    N. S. Raghava; Asok De; Pushkar Arora; Sagar Malhotra; Rishik Bazaz; Sahil Kapur; Rahul Manocha

    2011-01-01

    ). radiating patch and a circular ring shaped parasitic patch. The design was simulated with the help of IE3D v.14 software and the different parameters of the patch antenna were computed. Results show that the proposed antenna has promising characteristics for UWB applications such as Wireless Personal Area Network (WPAN), microwave imaging for detecting tumors and cancers, home networking etc.

  9. Dual-shorted monopole antenna for Ultra-Wideband application

    Microsoft Academic Search

    Chun-I Lin; Tzung-Wern Chiou; Sheng-Chih Lin; Fu-Ren Hsiao

    2008-01-01

    A novel dual-shorted monopole antenna suitable for UWB application, especially as an internal antenna for notebook or tablet PC has been proposed. The proposed antenna has a simple structure with a dual-shorted strip and is easy to implement at a low cost. Prototypes of the proposed antenna have been constructed and studied. A very uniform surface current distribution in the

  10. Compact Coupled Sectorial loops Antennas for Ultra-Wideband Applications

    Microsoft Academic Search

    Adel Elsherbini; Kamal Sarabandi

    This paper presents the structure and design of a number of significant modifications to the UWB coupled sectorial loops antennas (CSLA) to achieve further size reduction and unidirectional radiation over a very wide band. The variations of the radiation pattern at high frequencies of the original CSLA were less than desirable. Also, for many applications, unidirectional radiation pattern over a

  11. Investigations into printed monopole antennas for ultra-wideband applications

    Microsoft Academic Search

    S. K. Padhi; S. Zagriatski; S. Crozier; M. E. Bialkowski

    2005-01-01

    The paper reports an investigation into various designs of printed planar monopole antennas for UWB applications. Three different designs (designated Ant I, Ant II and Ant III) have been chosen and investigated. Ant I uses a straight feed line, while Ant II and Ant III use a tapered feed line. The taper length and angle have been optimized with HFSS.

  12. A modified printed monopole antenna for ultra-wideband applications

    Microsoft Academic Search

    S. Adnan; R. A. Abd-Alhameed; S. M. R. Jones; H. I. Hraga; M. S. Bin-Melha; E. A. Elkhazmi

    2010-01-01

    In this paper, a planer printed monopole antenna for Ultra Wide Bandwidth (UWB) applications is presented and discussed. To obtain the required wide response, the base of the monopole is tapered in five steps to match the width of the feeding line as it emerges from the ground plane. A parametric study is carried out for various antenna parameters using

  13. Signal Generation for FMCW Ultra-Wideband Radar

    E-print Network

    Patel, Aqsa Ejaz

    2009-01-01

    . The main objective of the thesis was to produce an ultra linear transmit chirp signal for UWB Radars. This was done by using the Voltage-Controlled-Oscillator (VCO) in a Phase-Locked Loop configuration. To check the linearity of the chirp beat frequency...

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

    E-print Network

    Elsherbeni, Atef Z.

    antenna tuned by a patch stub is designed and presented for ultra wideband band applications. The presented antenna exhibits a small size, a wide bandwidth of 98%, and a 6 dB average gain. Introduction% bandwidth in the X-band for a size of only 12 mm. In this paper, a CPW fed rectangular slot antenna

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

    E-print Network

    Arslan, Hüseyin

    ANTENNA CONCEPTS A wide variety of antennas are suitable for use in ultra- wideband applications. Some, a multi-band or OFDM approach may be more tolerant of dispersive antennas. ABSTRACT This paper presents-dispersive, but also more compact, small element antennas are preferred in many applications. The imminent widespread

  16. A novel pot shaped CPW-fed slot antenna for Ultra wideband applications

    Microsoft Academic Search

    Akkala. Subbarao; S. Raghavan

    2011-01-01

    A novel compact Ultra wideband antenna fed by CPW is presented. The antenna has a size of 29 mm x 31 mm. The antenna is excited by Pot shaped inner tuning stub. It provides band width ranging from 2.9 GHz to 10.2 GHz which covers Ultra Wide bandwidth. The antenna can be easily integrated with radio frequency circuit for low

  17. SYNCHRONIZATION OF ULTRA-WIDEBAND SIGNALS IN THE DENSE MULTIPATH CHANNEL

    E-print Network

    Southern California, University of

    Copyright 2004 Eric A. Homier #12;Dedication To my father, Jay, for his constant support and encouragement Demetras for all her help. I would like to thank all of my colleagues at the Ultra-Wideband Radio through this endeavor. Many thanks to my father, Jay Homier, for setting me on the path at an early age

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

    E-print Network

    Liu, Huaping

    1 Performance of an Optimally Spaced PPM Ultra-Wideband System with Direct Sequence Spreading position modulation (PPM) for data modulation and direct sequence (DS) spreading for multiple access spread spectrum systems, the use of spreading codes is solely for accommodating multiple users. Direct

  19. Simulated Transient Radiation Characteristics of Optimized Ultra Wideband Printed Dipole Antennas

    Microsoft Academic Search

    P. Cerny; M. Mazanek

    2007-01-01

    In case of particular ultra wideband applications (i.e. radar, positioning, etc.), it is crucial to know the transient responses of antennas. This paper picks up the threads of the previous work, where the optimization process searches for the dipole shape, which accomplishes two required parameters - good matching and minimal distortion. The particle swarm optimization method was used in the

  20. Experiments for ultra-wideband imaging radar with one-dimentional Synthetic Aperture

    Microsoft Academic Search

    Daeman Kim; Shangyoual Shin

    2011-01-01

    The experiments to acquire the basic data of the ultrawideband radar have been performed. In the experiments, targets are located at the back of the extruded polystyrene foam (Styrofoam) wall, and the antenna is scanned over the Styrofoam wall at the constant distance while the responses are recorded. For the experiments, the ultra-wideband radar consists of an oscilloscope, an impulse

  1. Ultra-wideband radar sensors for short-range vehicular applications

    Microsoft Academic Search

    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

    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

  2. Performance of RAKE Reception for Ultra Wideband Signals in a Lognormal-fading Channel

    Microsoft Academic Search

    J. Zhang; R. A. Kennedy; T. D. Abhayapala

    RAKE reception for Ultra Wideband is crucial as the radiated power is restricted to be very low and there exist many resolvable multipath components. In this paper, the effectiveness of RAKE reception is investigated analytically. First, the conditions under which the interference in the RAKE fingers can be ignored are discussed. Then a method is introduced to derive the explicit

  3. An ultra-wideband transceiver architecture for low power, low rate, wireless systems

    Microsoft Academic Search

    Ian D. O'Donnell; Robert W. Brodersen

    2005-01-01

    This paper presents the system architecture, modeling, and design constraints for a baseband, integrated, CMOS, impulse ultra-wideband transceiver targeting very low power consumption on the order of 1 mW. Intended for a sensor network application, the radio supports low communication rates (?100 kpbs) and ranging capabilities over short distances (?10 m). Based on a \\

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

    Microsoft Academic Search

    Tiziano Bianchi; Simone Morosi

    2004-01-01

    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

  5. Frequency domain detection strategies for short-range ultra-wideband communication systems

    Microsoft Academic Search

    Tiziano Bianchi; Simone Morosi

    2005-01-01

    In this paper, we propose a detection strategy for high rate short-range impulse radio ultra-wideband systems. The proposed detection scheme relies on both the introduction of the cyclic prefix at the transmitter and the use of a frequency domain multiuser detection approach at the receiver. Zero forcing (ZF) and minimum mean square error (MMSE) multiuser detectors have been investigated and

  6. Frequency domain detectors for ultra-wideband communications in short-range systems

    Microsoft Academic Search

    Simone Morosi; Tiziano Bianchi

    2008-01-01

    In this paper, we propose an original detection scheme for high rate short-range impulse radio ultra-wideband systems. The proposed receiver relies on both the introduction of the cyclic prefix at the transmitter and the use of a frequency domain multiuser detector at the receiver. Zero forcing (ZF) and minimum mean square error (MMSE) detection strategies have been investigated and compared

  7. Frequency domain multiuser detectors for ultra-wideband short-range communications

    Microsoft Academic Search

    Simone Morosi; Tiziano Bianchi

    2005-01-01

    In this paper, we propose an original multiuser detector for high rate short-range impulse radio ultra-wideband systems. The proposed receiver relies on both the introduction of the cyclic prefix at the transmitter and the use of a frequency domain multiuser detector at the receiver. Zero forcing (ZF) and minimum mean square error (MMSE) detection strategies have been investigated and compared

  8. UWB Tracking System Design for Free-Flyers

    NASA Technical Reports Server (NTRS)

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

    2004-01-01

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

  9. FPGA based Ultra-Wideband pseudo-noise radar

    Microsoft Academic Search

    Amutha Jayakumar; Asha Durafe

    2011-01-01

    A high accuracy experimental platform for Ultra Wide Band (UWB) PN radar performance evaluation has been created. This PN radar platform could be used for the applications such as unmanned- aerial-vehicle anti-collision and short-range distance measurement etc (3). It includes compact size X-band radar transceiver, baseband signal processing in FPGA, high speed analog to digital converter (ADC), and Matlab tools.

  10. Millimeter-wave silicon-based ultra-wideband automotive radar transceivers

    NASA Astrophysics Data System (ADS)

    Jain, Vipul

    Since the invention of the integrated circuit, the semiconductor industry has revolutionized the world in ways no one had ever anticipated. With the advent of silicon technologies, consumer electronics became light-weight and affordable and paved the way for an Information-Communication-Entertainment age. While silicon almost completely replaced compound semiconductors from these markets, it has been unable to compete in areas with more stringent requirements due to technology limitations. One of these areas is automotive radar sensors, which will enable next-generation collision-warning systems in automobiles. A low-cost implementation is absolutely essential for widespread use of these systems, which leads us to the subject of this dissertation---silicon-based solutions for automotive radars. This dissertation presents architectures and design techniques for mm-wave automotive radar transceivers. Several fully-integrated transceivers and receivers operating at 22-29 GHz and 77-81 GHz are demonstrated in both CMOS and SiGe BiCMOS technologies. Excellent performance is achieved indicating the suitability of silicon technologies for automotive radar sensors. The first CMOS 22-29-GHz pulse-radar receiver front-end for ultra-wideband radars is presented. The chip includes a low noise amplifier, I/Q mixers, quadrature voltage-controlled oscillators, pulse formers and variable-gain amplifiers. Fabricated in 0.18-mum CMOS, the receiver achieves a conversion gain of 35-38.1 dB and a noise figure of 5.5-7.4 dB. Integration of multi-mode multi-band transceivers on a single chip will enable next-generation low-cost automotive radar sensors. Two highly-integrated silicon ICs are designed in a 0.18-mum BiCMOS technology. These designs are also the first reported demonstrations of mm-wave circuits with high-speed digital circuits on the same chip. The first mm-wave dual-band frequency synthesizer and transceiver, operating in the 24-GHz and 77-GHz bands, are demonstrated. All circuits except the oscillators are shared between the two bands. A multi-functional injection-locked circuit is used after the oscillators to reconfigure the division ratio inside the phase-locked loop. The synthesizer is suitable for integration in automotive radar transceivers and heterodyne receivers for 94-GHz imaging applications. The transceiver chip includes a dual-band low noise amplifier, a shared downconversion chain, dual-band pulse formers, power amplifiers, a dual-band frequency synthesizer and a high-speed programmable baseband pulse generator. Radar functionality is demonstrated using loopback measurements.

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

    NASA Astrophysics Data System (ADS)

    Wang, Yazhou; Fathy, Aly E.

    2013-05-01

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

  12. UWB multi-burst transmit driver for averaging receivers

    DOEpatents

    Dallum, Gregory E

    2012-11-20

    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).

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

    Microsoft Academic Search

    Ryuji KOHNO

    2004-01-01

    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

  14. UWB Short Pulse Sensor for Target Electromagnetic Backscattering Characterization

    Microsoft Academic Search

    M. Le Goff; P. Pouliguen; Y. Chevalier; Y. Imhs; B. Beillard; J. Andrieu; B. Jecko; G. Bouillon; B. Juhel

    The Electronic Armament Centre (CELAR: Centre ?Electronique de I’Armement) has evaluated the use of a relatively low frequency\\u000a ultra-wide band short pulse measurement facility to characterize target electromagnetic signatures. Specific measurement instrumentation\\u000a has been developed and implemented. The initial measurement trial began at the beginning of 1998 and led to the establishment\\u000a of a database on various targets. These measurements

  15. UWB short pulse sensor for target electromagnetic backscattering characterization

    Microsoft Academic Search

    M. Le Goff; P. Pouliguen; Y. Chevalier; Y. Imbs; B. Beillard; J. Andrieu; B. Jecko; G. Bouillon; B. Juhel

    1998-01-01

    The Electronic Armament Centre (CELAR: Centre d'Electronique de l'Armement) has evaluated the use of a relatively low frequency ultra-wide band short pulse measurement facility to characterize target electromagnetic signatures. Specific measurement instrumentation has been developed and implemented. The initial measurement trial began at the beginning of 1998 and led to the establishment of a database on various targets. These measurements

  16. A Low-Power Ultra-Wideband CMOS True RMS Power Detector

    Microsoft Academic Search

    Yijun Zhou; Michael Yan-Wah Chia

    2008-01-01

    This paper introduces a low-power ultra-wideband true root-mean-square power detector with a 0.13-mum CMOS process operating from 125 MHz to 8.5 GHz. The detector utilizes the MOS transistor's square-law characteristic in the strong inversion region to obtain the power information of the input RF signal, and its exponential characteristic in the weak inversion region to realize the linear-in-decibel output. Measured

  17. Frequency-domain implementation of the transmitted-reference ultra-wideband receiver

    Microsoft Academic Search

    Sebastian Hoyos; Brian M. Sadler

    2006-01-01

    This paper presents a mixed-signal frequency-domain implementation of the autocorrelation receiver used in the detection of ultra-wideband communication signals that are modulated with transmitted-reference signaling. The digital receiver architecture is based on samples provided by an analog-to-digital converter (ADC) in the frequency domain. Among the advantages of the new receiver are the relaxation of the conversion speed achieved by the

  18. A filter bank based ultra-wideband receiver front-end for ranging applications

    Microsoft Academic Search

    Xavier Artiga; Lluís Berenguer

    2009-01-01

    This paper is intended to detail the practical implementation of a receiver front-end, used in an impulse radio ultra-wideband testbed for low data rate communications and ranging. The receiver architecture consists of a filter bank followed by a downconversion stage that relaxes the analog-to-digital converters requirements in terms of input analog bandwidth. The filter bank is implemented by a four-way

  19. Compact CPW-fed circular slot antenna for ultra-wideband applications

    Microsoft Academic Search

    Meie Chen; Junhong Wang

    2008-01-01

    A compact circular slot antenna for ultra-wideband applications is proposed in this letter. The antenna consists of a circular patch and an open annulus, and is fed by coplanar waveguide. The total dimension of the antenna is 30 mmtimes33 mmtimes1.57 mm. The proposed antenna is simulated, fabricated and tested. Results show that a maximum relative impedance bandwidth of more than

  20. Printed diversity antenna with cross shape stub for ultra-wideband applications

    Microsoft Academic Search

    Yong Cheng; Wen-jun Lu; Chong-hu Cheng; Wei Cao; Yong Li

    2008-01-01

    A printed diversity antenna for ultra-wideband applications is proposed. The proposed antenna is composed of two square monopoles. In order to reduce the mutual coupling between the two elements, A cross shape stub is introduced. The antenna has been investigated numerically. As is reported, the operation bandwidth of the antenna is from 3.3 GHz to 10.5 GHz. Good isolations can

  1. Compact diversity antenna with T shape stub for Ultra-wideband applications

    Microsoft Academic Search

    Yong Cheng; Wen-jun Lu; Chong-hu Cheng; Wei Cao; Yong Li

    2008-01-01

    A compact diversity antenna for Ultra-wideband applications is proposed. The proposed antenna is composed of two square monopoles. In order to reduce the mutual coupling between the two elements, A T shape stub is introduced. The antenna has been investigated numerically. As is reported, the operation bandwidth of the antenna is from 3.3GHz to 10.4GHz. Good isolations can be achieved.

  2. Multipath Amplification of Chaotic Radio Pulses and UWB Communications

    E-print Network

    Yuri V. Andreyev; Alexander S. Dmitriev; Andrey V. Kletsov

    2008-11-14

    Effect of multipath amplification is found in ultrawideband wireless communication systems with chaotic carrier, whereas information is transmitted with chaotic radio pulses. This effect is observed in multipath environment (residence, office, industrial or other indoor space). It exhibits itself through an increase of signal power at the receiver input with respect to the case of free space. Multipath amplification effect gives 5-15 dB energy gain (depending on the environment), which allows to have 2-6 times longer distance range for the same transmitter power.

  3. A TH-UWB receiver with near-MUD performance for multiple access interference environments

    Microsoft Academic Search

    Iraj Hosseini; Norman C. Beaulieu

    2009-01-01

    The multiple access interference (MAI) in a time-hopping (TH) ultra-wideband (UWB) system is known to be non-Gaussian even when the system has a moderately large number of active users. Therefore, the conventional matched filter (CMF) receiver, the optimal structure for Gaussian noise which maximizes the signal-to-noise ratio (SNR) and minimizes the probability of detection error in the absence of non-Gaussian

  4. Modeling and Mitigation of Narrowband Interference for Transmitted-Reference UWB Systems

    Microsoft Academic Search

    Yohannes D. Alemseged; Klaus Witrisal

    2007-01-01

    Transmitted-reference ultra-wideband (TR-UWB) systems, in conjunction with autocorrelation-receivers (AcR), can collect all energy of the multipath channel response at low complexity. Unfortunately the AcR front-end also collects the energy of narrowband interference (NBI) signals, which severely degrades its performance. We present an elaborate statistical analysis of the NBI for a multichannel AcR front-end. Our results show specific correlation properties, which

  5. A Miniaturized Elliptic-Card UWB Antenna With WLAN Band Rejection for Wireless Communications

    Microsoft Academic Search

    Keyvan Bahadori; Yahya Rahmat-Samii

    2007-01-01

    An elliptic-card ultra-wideband (UWB) (3-11 GHz) planar antenna is designed and miniaturized. It consists of an elliptic radiating element and a rectangular ground plane. A novel feeding mechanism is proposed to feed the antenna by using a microstrip line on the other side of the substrate and connecting the line to the elliptic element by a via. The structure of

  6. Small UWB Antennas for Wireless USB Dongle Attached to Laptop Computer

    Microsoft Academic Search

    Zhi Ning Chen; T. S. P. See

    2007-01-01

    This paper investigates the application of a small ultra-wideband (UWB) antenna with a reduced ground-plane effect in a wireless USB dongle, which is attached to a laptop computer. The antenna is printed onto a piece of PCB and embedded into a wireless universal serial bus (USB) dongle. The radiator may be co-planar or perpendicular to the PCB. The impedance and

  7. Ranging in a dense multipath environment using an UWB radio link

    Microsoft Academic Search

    Joon-Yong Lee; Robert A. Scholtz

    2002-01-01

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

  8. Novel cooperative communication schemes for Space-Time-Frequency Coded MB-OFDM UWB

    Microsoft Academic Search

    Le Chung Tran; A. Mertins; X. Huang; Eryk Dutkiewicz

    2009-01-01

    Cooperative communication has been intensively considered for general wireless and sensor networks. However, it has been almost untouched in space-time-frequency coded multi-band OFDM ultra-wideband (STFC MB-OFDM UWB) systems. This paper thus proposes two cross-layer designs for cooperative communication, namely simple cooperative communication scheme (SCCS) and advanced cooperative communication scheme (ACCS), in slow fading scenarios. In the former, nodes always cooperate

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

    Microsoft Academic Search

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

    2006-01-01

    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

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

    Microsoft Academic Search

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

    2011-01-01

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

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

    Microsoft Academic Search

    Mauro Mangia; Riccardo Rovatti; Gianluca Setti

    2010-01-01

    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

  12. Implemention of 128Point Fast Fourier Transform Processor for UWB Systems

    Microsoft Academic Search

    Sang-In Cho; Kyu-Min Kang; Sang-Sung Choi

    2008-01-01

    In this paper, we present a 4-parallel fast Fourier transform (FFT) processor for a multi-band orthogonal frequency division multiplexing (MB-OFDM) ultra wideband (UWB) system. The proposed FFT processor utilizes radix-24 structure so as to significantly enhance the hardware complexity by reducing the numbers of multipliers and adders. The hardware efficient 4-parellel 128-point FFT processor employing the decimation-in-frequency (DIF) and the

  13. Time-Hopping Sequence Design for Narrowband Interference Suppression

    E-print Network

    Kavcic, Aleksandar

    for coexistence of Ultra-Wideband (UWB) systems with other wireless systems. Specifically, we consider the design) issued Ultra-Wideband (UWB) regulations, under Part 15 of the Commission's rules, permitting UWB], directional antennas, notch filters [7] and pulse shaping [8] for wideband systems currently exist

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

    E-print Network

    Baudoin, Geneviève

    generator and antenna dedi- cated to UWB radio communication in 3.1-5.1GHz band and targeting sensor and BAN-IR (Impulse Radio) technology uses an ultra wide frequency band in order to transmit information underUWB Pulse Generation in the 3.1-5.1GHz band David Marchaland, Martine Villegas, Genevi`eve Baudoin

  15. A pulse generator UWB-Ultra Wide Band using PFD Phase Frequency Detector in 180nm CMOS technology

    Microsoft Academic Search

    Luiz C. Moreira; W. A. M. Van Noije; C. R. P. Dionisio; H. D. O. Ascama; S. T. Kofuji

    2009-01-01

    This paper presents a design of a transmitter pulse generator UWB-Ultra Wide Band in standard 180 nm MOSIS\\/CMOS technology. We proposed a pulse generator using Phase-Frequency Detector (PFD) that is designed using a modified architecture TSPC (True Single-phase Clock) positive edge triggered D Latch. The operation range and power consumption PFD is 45 ¿W to 2 mW, from 200 MHz

  16. Time Reversal with MISO for Ultra-Wideband Communications: Experimental Results (invited paper)

    E-print Network

    Qiu, Robert Caiming

    by IEEE 802.15.4a with joint communication and ranging capabilities unique to UWB. The application of UWB, and military applications. The central issue facing UWB community is the complexity of the receivers [5]. Time-wave and electromagnetic-wave phenomena. II. THEORY The configuration of an UWB MISO system with 4 transmitting antennas

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

    NASA Astrophysics Data System (ADS)

    Xu, Xiaojian; He, Feiyang

    2014-09-01

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

  18. Distance bounded energy detecting ultra-wideband impulse radio secure protocol.

    PubMed

    Hedin, Daniel S; Kollmann, Daniel T; Gibson, Paul L; Riehle, Timothy H; Seifert, Gregory J

    2014-01-01

    We present a demonstration of a novel protocol for secure transmissions on a Ultra-wideband impulse radio that includes distance bounding. Distance bounding requires radios to be within a certain radius to communicate. This new protocol can be used in body area networks for medical devices where security is imperative. Many current wireless medical devices were not designed with security as a priority including devices that can be life threatening if controlled by a hacker. This protocol provides multiple levels of security including encryption and a distance bounding test to prevent long distance attacks. PMID:25571513

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

    Microsoft Academic Search

    S. M. Riazul Islam; Kyung Sup Kwak

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

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

    Microsoft Academic Search

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

    2009-01-01

    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

  1. A Compact Band-Notched UWB Antenna Optimized by a Novel Self-Adaptive Differential Evolution Algorithm

    Microsoft Academic Search

    L. Xie; Y.-C. Jiao; Y.-Q. Wei; G. Zhao

    2010-01-01

    In this paper, a compact ultra-wideband (UWB) antenna with a WLAN band-notched characteristic is presented. The design technique is based on a novel self-adaptive Differential Evolution (DE) algorithm namely ISADE (improved self-adaptive Differential Evolution algorithm). In order to evaluate the algorithm's performance, we tested it on nine most commonly used benchmark functions. Experimental results have shown that the proposed algorithm

  2. Circuit-Switching Physical Layer Based on Time-Frequency Coding for MultiBand UWB Wireless Networks

    Microsoft Academic Search

    Vasily Aristarkhov

    2008-01-01

    The article describes physical layer (PHY) for high data-rate self-organized wireless networks based on the Ultra Wideband (UWB) technology with frequency band [3.1 - 10.6] GHz. The developed transceiver scheme has wide range adaptation features and cross-layer elements based on convergence of maximum likelihood sequence estimation (MLSE) equalizer and frequency hopping (FH). Circuit switching technology for multiply access and data

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

    Microsoft Academic Search

    Shao Ke; Chen Hu; Pan Yaohua; Hong Zhiliang

    2010-01-01

    A low jitter, low spur multiphase phase-locked loop (PLL) for an impulse radio ultra-wideband (IR-UWB) receiver is presented. The PLL is based on a ring oscillator in order to simultaneously meet the jitter requirement, low power consumption and multiphase clock output. In this design, a noise and matching improved voltage-controlled oscillator (VCO) is devised to enhance the timing accuracy and

  4. A 255 MHz Programmable Gain Amplifier and Low-Pass Filter for Ultra Low Power Impulse-Radio UWB Receivers

    Microsoft Academic Search

    Stefano D'Amico; Marco De Blasi; Marcello De Matteis; Andrea Baschirotto

    2012-01-01

    A 90 nm-CMOS power-optimized analog baseband chain for ultra-low-power impulse-radio ultra-wideband (IR-UWB) receivers is presented. The proposed device merges the functions of a programmable gain amplifier (PGA) and a low-pass filter (LPF). It consists of the cascade of three biquadratic cells made up by opamps in a series-shunt configuration, which features high input impedance, low load effects in the cascade

  5. Low power consuming pulse detector

    Microsoft Academic Search

    P. Rulikowski; V. Sokol; J. Barrett

    2005-01-01

    A new approach for detection of ultra-wideband pulses based on a flip-flop circuit is proposed in this paper. A functional sample of the pulse detector was designed, manufactured and measured. The detector is able to detect a pulse 335 ps wide with a pulse repetition frequency (PRF) of at least 10 MHz, whereas a minimum detectable signal level is approximately

  6. Ultra-Wideband GPR Imaging of the Vaucluse Karst Aquifer

    NASA Astrophysics Data System (ADS)

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

    2008-12-01

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

  7. Joint Scale-Lag Diversity in Mobile Ultra-Wideband Adam R. Margetts and Philip Schniter

    E-print Network

    Schniter, Philip

    -wideband (UWB) direct sequence spread spectrum communication system. Based on a uniform ring of scatterers model may be temporally delayed by a different amount. For UWB direct- sequence spread spectrum (DSSS

  8. Cognitive interference suppression for low complexity UWB transceivers

    Microsoft Academic Search

    Christoph Steiner; Armin Wittneben

    2008-01-01

    Interference suppression techniques for low complexity ultra wideband transceivers using pulse position modulation and energy detection receivers are proposed and evaluated. A theoretical framework is introduced, which enables the optimization of pulse shapes and energy detection integration windows based on a signal-to-interference-and-noise ratio criterion. Furthermore, the framework allows to incorporate statistical channel knowledge into the optimization problem. The effect of

  9. Design of LTCC-based ultra-wideband transmitter SiP using CMOS impulse generator

    Microsoft Academic Search

    Changwook Yoon; Junwoo Lee; Myunghoi Kim; Youngjin Park; Hyein Lee; Joungho Kim

    2006-01-01

    In this paper, a low-cost, compact form factor UWB impulse transmitter module is presented for impulse radio communication and radar. It consists of an impulse generator on chip, a compact UWB band pass filter (BPF) for impulse shaping, an amplifier in package, and a printed planar UWB antenna on board. The small BPF which has a low insertion loss is

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

    E-print Network

    Kansas, University of

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

  11. Active UWB antenna

    Microsoft Academic Search

    Mithilesh Kumar; Ananjan Basu; Shiban K. Koul

    2010-01-01

    This paper presents a novel scheme for development of an active Ultra-Wide Band (UWB) antenna. A single pulse of 133 ps and amplitude 530 mV peak to peak was obtained using High Electron Mobility Transistor (HEMT) as a generation circuit. This generation circuit was next integrated with a newly proposed UWB planar microstrip antenna. Transmission and reception characteristics of the

  12. alpha-stable interference modeling and cauchy receiver for an IR-UWB Ad Hoc network

    Microsoft Academic Search

    Hamza El Ghannudi; Laurent Clavier; Nourddine Azzaoui; François Septier; Paul-Alain Rolland

    2010-01-01

    In this paper we investigate ad hoc networks based on impulse radio ultra wideband. Due to multiple access, the interference distribution is not Gaussian. One important reason for errors is the presence of close interferers generating pulse collision. However such events are rare and we propose an ?-stable model compatible with this fact due to its heavy tailed distribution. We

  13. Improving the jam resistance performance of UWB impulse radio independently of time hopping codes

    Microsoft Academic Search

    Tao Wang; Yong Wang; Kangsheng Chen

    2004-01-01

    The jam resistance performance of ultra wideband impulse radio with binary pulse position modulation and time hopping spread spectrum through a general sequence is analyzed in terms of the processing gain theoretically, assuming the jam interference as a continuous wide sense stationary random process occupying a single band whose bandwidth is much smaller than the impulse radio bandwidth. The general

  14. Hardware Aware Optimization of an Ultra Low Power UWB Communication System

    Microsoft Academic Search

    Florian Troesch; Christoph Steiner; Thomas Zasowski; Thomas Burger; Armin Wittneben

    2007-01-01

    A wireless body area network with an average throughput of 500 kbps based on ultra-wideband pulse position modulation is considered. For a long battery autonomy a hardware aware system optimization with respect to the specific applications at hand is essential. A key feature to achieve power savings is low duty cycle signaling, and its effectiveness when combined with burst-wise transmission

  15. 1656 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 54, NO. 4, APRIL 2006 Codesign of an Impulse Generator and

    E-print Network

    Serdijn, Wouter A.

    of an Impulse Generator and Miniaturized Antennas for IR-UWB Sumit Bagga, Student Member, IEEE, Alexander V and miniatur- ized antennas for ultra-wideband impulse radio is described. The impulse generator, discussed, integrated circuits (ICs), pulse-position modulation, transceiver, ultra-wideband (UWB). I. INTRODUCTION

  16. 30 pJ/b, 67 Mbps, Centimeter-to-Meter Range Data Telemetry With an IR-UWB Wireless Link.

    PubMed

    Ebrazeh, Ali; Mohseni, Pedram

    2014-08-12

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

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

    E-print Network

    Liu, Ya-Chi

    2014-01-14

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

  18. Investigations on co-planar waveguide fed pentagon shape planar monopole ultra-wide bandwidth (UWB) antenna on foam substrate providing invariant radiation patterns

    Microsoft Academic Search

    Robert A. Moody; Satish K. Sharma

    2010-01-01

    It is well-established that the planar monopole antenna exhibits wideband impedance matching characteristics, high radiation efficiency, and an omni-directional pattern that makes it a desirable candidate for ultra-wideband (UWB) applications [1-2]. However, the radiation pattern deteriorates rapidly towards the high frequency end. Antennas fed with co-planar waveguides (CPW) have the further advantages of low dispersion for wideband applications, reduced radiation

  19. FPGA-based architecture and implementation techniques of a low-complexity hybrid RAKE receiver for a DS-UWB communication system

    Microsoft Academic Search

    Christos Thomos; Grigorios Kalivas

    In this paper, the architecture of a low-complexity Direct Sequence Ultra-Wideband (DS-UWB) receiver subsystem which incorporates\\u000a a Channel Estimator (CE) and a novel hybrid Partial\\/Selective (HPS) maximal ratio combining (MRC) RAKE receiver is presented.\\u000a Three different design techniques followed by FPGA implementation are investigated and compared and system performance results\\u000a are provided. The proposed architectures combine the benefits of both

  20. A design of sub-band generator for MB-OFDM UWB application in 0.13 ?m RF CMOS process

    Microsoft Academic Search

    Joon Sung Park; YoungGun Pu; Young-Shin Kim; Chul Nam; Kang-Yoon Lee

    2008-01-01

    This paper describes a 3 to 5 GHz frequency synthesizer for MB-OFDM (multi-band OFDM) UWB (ultra-wideband) application using 0.13 um CMOS process. The frequency synthesizer operates in the band group 1 whose center frequencies are 3432 MHz, 3960 MHz, and 4488 MHz. To cover the overall frequencies of group 1, an efficient frequency planning minimizing a number of blocks and

  1. Winner-hopf interpolation aided kalman filter-based channel estimation for MB-OFDM UWB systems in time varying dispersive fading channel

    Microsoft Academic Search

    S. M. Riazul Islam; Kyung Sup Kwak

    2010-01-01

    New channel estimation technique is proposed for multiband orthogonal frequency division multiplexing (MBOFDM) ultra wideband (UWB) systems in multipath time varying wireless channels. Two-stage approach has been used to achieve this purpose. In first stage, Winner-Hopf filtration has been employed for the interpolation of unknown channel state information (CSI) using comb-type known pilots. In second stage, interpolated channel statistics are

  2. Super-Regenerative Architecture for UWB Pulse Detection: From Theory to RF Front-End Design

    Microsoft Academic Search

    Michael Pelissier; Dominique Morche; Pierre Vincent

    2009-01-01

    This paper presents an optimization of the super-regenerative architecture for impulse-based ultrawideband (UWB) technology dedicated to low-data-rate applications. The receiver belongs to the noncoherent category but enables nanosecond resolution for efficient location and tracking applications. Relying on analytical developments, this paper demonstrates how the super-regenerative architecture can suit the UWB context. Such a receiver enables a high RF gain and

  3. An analog approach to interference suppression in ultra-wideband receivers

    E-print Network

    Fischer, Timothy W.

    2007-09-17

    are presented, and a solution is proposed. To combat interference in Multi-Band OFDM (MB-OFDM) UWB systems, an analog notch filter is designed to be included in the UWB receive chain. The architecture of the filter is based on feed-forward subtraction...

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

    Microsoft Academic Search

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

    2005-01-01

    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

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

    Microsoft Academic Search

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

    2010-01-01

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

  6. A Compact, ESD-Protected, SiGe BiCMOS LNA for Ultra-Wideband Applications

    Microsoft Academic Search

    Karan Bhatia; Sami Hyvonen; Elyse Rosenbaum

    2007-01-01

    Two 3.65-mW, ESD-protected, BiCMOS ultra-wideband low-noise amplifiers (LNAs) for operation up to 10 GHz are presented. These common-base LNAs achieve significant savings in die area over more widely used cascoded common-emitter LNAs because they do not use an LC input matching network. A design with a shunt peaked load achieves a high S21 (17-19 dB) and low noise figure (NF)

  7. An ultra-wideband printed monopole antenna with the gain enhanced using a surface-mounted short horn

    Microsoft Academic Search

    Y. Ranga; Karu P. Esselle; A. R. Weily; A. K. Verma

    2010-01-01

    An ultra-wideband printed monopole antenna, improved by attaching a short two-plate horn to its surface, is reported in this paper. The short horn, which has a slant length of 45 mm and a total physical height of 46.9 mm, significantly increases the gain of the printed monopole antenna at lower frequencies where the gain of the monopole is otherwise low,

  8. Development of an Educational Environment for Simulating Multistatic UWB Radars for Locating an Intruder Inside Indoor Environment

    Microsoft Academic Search

    Josivaldo Araujo; Rodrigo Melo e Silva de Oliveira; Kellen Diane Gomes; Rubem Farias; Carlos Leonidas Sobrinho

    2009-01-01

    This work describes a educational tool developed in Java language for simulating a multi-static radar. This radar is used to identify the presence of an intruder inside a residence. In order to obtain high resolution, the radar operates with ultra-wideband pulses (Gaussian monocycle), which have maximum spectral amplitude at 1 GHz and half power bandwidth of approximately 1 GHz. For

  9. UWB Tracking System Design with TDOA Algorithm

    NASA Technical Reports Server (NTRS)

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

    2006-01-01

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

  10. Cramer-Rao Lower Bounds for Semi-Blind ML Channel Estimation in UWB Systems

    Microsoft Academic Search

    Lei Huang; Chi Chung Ko

    2006-01-01

    This paper derives a unified representation of the Cramer-Rao lower bounds (CRLBs) for semi-blind maximum-likelihood (ML) channel estimation in time-hopping (TH) ultra-wideband systems with pulse amplitude and position modulation, pulse amplitude modulation and pulse position modulation (PPM). These bounds subsume the existing results for both pilot-based and blind ML channel estimation in TH-PPM as special cases. A numerical example is

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

    PubMed

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

    2013-01-01

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

  12. System design of an ultra-low power, low data rate, pulsed UWB receiver in the 0-960 MHz band

    Microsoft Academic Search

    Marian Verhelst; Wim Dehaene

    2005-01-01

    This paper describes a complete system architecture for an ultra-low power, pulsed UWB receiver in the 0-960 MHz band for low data rate communication (10 kbps) in sensor networks, together with its acquisition algorithms and performance evaluation. Power consumption of this receiver is decreased impressively in relation to common fully digital receivers by shifting the matched filter operation to the

  13. Switchable UWB pulse generation using a phase modulator and a reconfigurable asymmetric

    E-print Network

    Yao, Jianping

    ­Zehnder interferometer Shilong Pan and Jianping Yao* Microwave Photonics Research Laboratory, School of Information and a reconfigurable asymmetric Mach­Zehnder interferometer (AMZI). In the proposed system, an optical carrier is phase delay in the FBG. Recently, Li et al. proposed a flex- ible UWB source using a Sagnac-interferometer

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

    Microsoft Academic Search

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

    2011-01-01

    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

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

    E-print Network

    Paris-Sud XI, Université de

    ), ii) Multi-narrowband applications such as signal intelligence and detection, iii) Modern UWB major types of applications [1]: i) Applications such as Ground Penetrating Radars (GPR, 1MHz to 10 GHz profiles), minimum reactive power and hence resonance (which leads to thick or bulbous structures), low

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

    PubMed

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

    2010-01-01

    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

  17. UWB Array Design Using Variable Zo Technology and Central Force Optimization

    E-print Network

    Formato, Richard A

    2011-01-01

    This note applies Variable Zo technology to the design of an Ultra Wideband (UWB) Yagi-Uda array optimized using Central Force Optimization. Variable Zo is a novel and proprietary approach to antenna design and optimization that treats the feed system characteristic impedance, Zo, as a design variable instead of a fixed design parameter as is traditionally done. Variable Zo is applicable to any antenna design or optimization methodology, and using it will generally produce better antenna designs across any user-specified set of performance objectives.

  18. Effects of Quantization in Systolic 2D IIR Beam Filters on UWB Wireless Communications

    Microsoft Academic Search

    Sean Victor Hum; Leonard T. Bruton

    Ultra-wideband (UWB) wireless beamforming systems may potentially be implemented digitally at multi-gigahertz clock frequencies\\u000a using low-precision systolic array realizations of two-dimensional (2D) infinite impulse response (IIR) beam plane-wave filters.\\u000a The finite precision performance of such filters is analyzed in terms of quantization noise. Extensive Monte Carlo simulations\\u000a are performed using test vectors that are derived from 2D finite-difference time-domain (FDTD)

  19. Detection and Classification of Transformer Winding Mechanical Faults Using UWB Sensors and Bayesian Classifier

    NASA Astrophysics Data System (ADS)

    Alehosseini, Ali; A. Hejazi, Maryam; Mokhtari, Ghassem; B. Gharehpetian, Gevork; Mohammadi, Mohammad

    2015-06-01

    In this paper, the Bayesian classifier is used to detect and classify the radial deformation and axial displacement of transformer windings. The proposed method is tested on a model of transformer for different volumes of radial deformation and axial displacement. In this method, ultra-wideband (UWB) signal is sent to the simplified model of the transformer winding. The received signal from the winding model is recorded and used for training and testing of Bayesian classifier in different axial displacement and radial deformation states of the winding. It is shown that the proposed method has a good accuracy to detect and classify the axial displacement and radial deformation of the winding.

  20. CMOS Integrated Circuit Design for Ultra-Wideband Transmitters and Receivers 

    E-print Network

    Xu, Rui

    2010-10-12

    and Bluetooth are mostly narrow band based. To implement UWB technologies on CMOS imposes the development of CMOS front-end building blocks which can perform wideband signal processing such as amplifying, frequency conversion, frequency generation as well...

  1. An all-digital transmitter for pulsed ultra-wideband communication

    E-print Network

    Mercier, Patrick Philip

    2008-01-01

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

  2. Testing and Evaluation of an Ultra-Wideband Pulse Generator for HPM Weapon Simulation

    Microsoft Academic Search

    S. A. Merryman; F. E. Peterkin; W. D. Sessions; D. C. Stoudt

    2005-01-01

    The potential for high power microwave (HPM) and radio frequency weapons (RFW) to degrade or destroy electronics has been studied for decades. However, the fast pace of change in the underlying digital technologies of modern electronics makes it necessary to continually re-evaluate the susceptibilities of such systems. The Directed Energy Technology Office has developed a major test complex at the

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

    Microsoft Academic Search

    Michael Camp; Heyno Garbe

    2004-01-01

    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

  4. An Ultra-Wideband Radar System for Through-the-Wall Imaging using a Mobile Robot

    E-print Network

    using microwave signals serves amongst other appli- cations in the rapid detection of human maneuvering visually opaque materials using microwave signals is considered a powerful tool in both military unlicensed band from 3.1-10.6 GHz in 2002, has fed the commercial success of UWB technology in fast

  5. Finite-resolution digital receiver design for impulse radio ultra-wideband communication

    Microsoft Academic Search

    Lei Ke; Huarui Yin; Weilin Gong; Zhengdao Wang

    2008-01-01

    Receiver design for impulse radio based ultrawideband (UWB) communication is a challenge. High sampling rate high resolution digital receiver is usually difficult to implement. Some tradeoffs can be made on the digital receiver, such as limiting amplitude resolution to only one bit, which results in a previously considered monobit receiver. In this paper, we consider the design of finite-resolution digital

  6. ASYMPTOTIC ANALYSIS OF CHANNEL DIVISION MULTIPLE ACCESS SCHEMES FOR ULTRA-WIDEBAND SYSTEMS

    E-print Network

    Paris-Sud XI, Université de

    , low cost indoor communication systems such as Wireless Local Area Network (WLAN) and Personal Area the asymptotic capacity of the ChDMA scheme when the number of users and the number of frequency dimensions radio technology due to the large available bandwidth. UWB systems enables high data rates at short

  7. Rapid acquisition of ultra-wideband signals in the dense multipath channel

    Microsoft Academic Search

    Eric A. Homier; Robert A. Scholtz

    2002-01-01

    Efficient serial search strategies are presented and shown to reduce drastically the mean acquisition time for UWB signals in a dense multipath environment. Inherent in traditional serial search problems is the assumption that only a single bin or a small number of consecutive bins can properly terminate the search. This assumption leads to search strategies which tend to be linear

  8. Ultra-Wideband Time-Difference-of-Arrival Two-Point-Tracking System

    NASA Technical Reports Server (NTRS)

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

    2009-01-01

    A UWB TDOA Two-Point-Tracking System has been conceived and developed at JSC. This system can provide sub-inch tracking capability of two points on one target. This capability can be applied to guide a docking process in a 2D space. Lab tests demonstrate the feasibility of this technology.

  9. Direction-resolved estimation of multipath parameters for UWB channels: A partially collapsed Gibbs sampler method

    Microsoft Academic Search

    Georg Kail; Klaus Witrisal; Franz Hlawatsch

    2011-01-01

    We propose a Monte Carlo method for determining the parameters of multipath components (MPCs) for ultra-wideband channels. A partially collapsed Gibbs sampler is used for jointly estimating the number, times-of-arrival, angles-of-arrival, and amplitudes of the MPCs as well as the sounding pulse from signals received by a 2D antenna array. Our system model accounts for propagation delays between the receive

  10. TO APPEAR IN IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS (SPECIAL ISSUE ON ULTRA WIDEBAND WIRELESS COMMUNICATIONS) 1 Secure Localization and Authentication in

    E-print Network

    Wu, Dapeng Oliver

    .S. Office of Naval Research under Young Investigator Award N000140210464, and the US National ScienceTO APPEAR IN IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS (SPECIAL ISSUE ON ULTRA WIDEBAND limit the paper scope to range-based approaches and leave the investigation on range-free ones

  11. UWB communication receiver feedback loop

    DOEpatents

    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

    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.

  12. MULTI-RESONANCE SQUARE MONOPOLE ANTENNA FOR ULTRA-WIDEBAND APPLICATIONS

    Microsoft Academic Search

    Azad Ghazi; Mohammad Naghi Azarmanesh; Mohammad Ojaroudi

    2010-01-01

    In this paper, a modifled square monopole antenna with multi-resonance performance, for UWB applications is proposed. The proposed antenna consists of a square radiating patch with a pair of T-shaped slots and a ground plane with a pair of rectangular sleeve and a T-shaped resonator which provides a wide usable fractional bandwidth of more than 125% (3.05{13.57GHz). By optimizing dimension

  13. Novel compact bow-tie slot antennas for ultra-wideband applications

    Microsoft Academic Search

    Liang Zhou; Shaobin Liu; Yu Chen

    2010-01-01

    The increase of mobile applications requires antennas ever smaller in form factor. In this paper, three kinds of bow-tie slot antennas have been proposed for ultra-wide band (UWB) applications in the 3.1-10.6 GHz band including full-size, half-size and half-size antennas with a band notch. The half-size antenna with dimensions of 30×29 mm2 is proposed by halving the full-size symmetrical antenna.

  14. System-on-Package Ultra Wideband Transmitter with Integrated Bandpass Filter and Broad Band Planar Antenna

    Microsoft Academic Search

    Myunghoi Kim; Junwoo Lee; Joungho Kim

    2005-01-01

    In this paper, the UWB transmitter module for System-onPackage (SOP) is presented, which contains the miniaturized bandpass filter. This module is designed to achieve low data rate, low cost applications for location and tracking system based on non-coherent architecture. The presented module contains Field Programmable Gate Array (FPGA), the crystal oscillator, RF amplifier, planar antenna and bandpass filter the role

  15. Provision of IR-UWB wireless and baseband wired services over a WDM-PON.

    PubMed

    Pan, Shilong; Yao, Jianping

    2011-12-12

    A simple scheme to simultaneously generate an on-off keying or bi-phase modulation (BPM) impulse radio ultra wideband (IR-UWB) signal and a baseband wired signal in the optical domain using a dual-drive modulator is proposed and demonstrated. Although the two signals have spectral overlap in the optical spectrum, they are located at different frequency bands when converted to electrical signals at a photodetector (PD), which can be well separated by an electrical filter. An experiment is carried out. Eye diagrams, electrical spectra and BER measurements show that the co-channel interference between the UWB and the wired signals is small for a single-channel 36-km fiber link to provide 1.25-Gb/s UWB wireless and 1.25-Gb/s baseband wired services. The inter-channel interference is also small and negligible when the link is operated together with two other 1.25 Gb/s baseband wired links, which demonstrates that a conventional WDM-PON can be upgraded to provide additional UWB services without affecting the existing services by modifying the modulators in the center office and inserting UWB antennas in the optical network units. PMID:22274021

  16. A framework for UWB-based communication and location tracking systems for wireless sensor networks.

    PubMed

    Chóliz, Juan; Hernández, Angela; Valdovinos, Antonio

    2011-01-01

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

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

    PubMed Central

    Chóliz, Juan; Hernández, Ángela; Valdovinos, Antonio

    2011-01-01

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

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

    PubMed Central

    Kabir, Md. Humayun; Kohno, Ryuji

    2012-01-01

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

  19. A hybrid TOA-fingerprinting based localization of mobile nodes using UWB signaling for Non-line-of-sight conditions.

    PubMed

    Kabir, Md Humayun; Kohno, Ryuji

    2012-01-01

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

  20. A NOVEL MODULATION DIVERSITY ASSISTED ULTRA WIDEBAND COMMUNICATION Jin Tang, Zhengyuan Xu

    E-print Network

    Xu, Zhengyuan "Daniel"

    ]. In such a system, a pulse without data modulation is transmitted before each data-modulated pulse. Be- cause is not bandwidth efficient and has big performance loss due to the noisy template. In [4], [5], [6], [7], different (MDA) transmission scheme by using the diversity concept. Pulse posi- tion modulation (PPM) and pulse

  1. Photonic envelope detection and fiber transmission of 24 GHz IR-UWB signal based on phase modulation

    NASA Astrophysics Data System (ADS)

    Yin, Xiao-li; Han, Jing-jing; Xu, Can; Hao, Ji; Xin, Xiang-jun; Li, Li

    2015-01-01

    A novel scheme for photonic envelope detection and fiber transmission of 24 GHz impulse radio ultra-wideband (IRUWB) signal is proposed based on phase modulator (PM). In the system, an optics assisted envelope detection unit (OAEDU) is used for filtering one of the first sidebands at the output of PM, then this narrow band optical signal transfers over single-mode fiber (SMF), and the envelope of 24 GHz IR-UWB signal is obtained after photodetection (PD) and low pass filter (LPF). The numerical simulation results show that the combination of PM and OAEDU can alleviate the fiber chromatic dispersion (CD) effectively. The proposed system may provide a simple and cost-effective solution for IR-UWB receiver.

  2. An Alternative Way to Calibrate Ubisense Real-Time Location System via Multi-Camera Calibration Methods

    E-print Network

    Kovacic, Stanislav

    and Ubisense software platform running on a PC. The sensor is a precision ultra-wideband (UWB) mea- surement device that contains an array of antennas and UWB radio receivers. It detects UWB pulses from the tags. An application considered in the paper is rapid de- ployment of Ubisense system for tracking in sports. Sur- vey

  3. Impulse Radio Ultra-Wideband Communication Over Free-Space Optical Links

    E-print Network

    Deliç, Hakan

    phase modulator (EOPM) and fiber Bragg grating (FBG) which modulate the input Gaussian pulse sequences. The carrier is located at the quadrature slope of the FBG serving as a frequency discriminator. Hence, at the output of FBG, the second-order derivative of Gaussian pulses are obtained. Pulse- position modulation

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

    E-print Network

    Han, Jeongwoo

    2006-08-16

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

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

    PubMed

    Islam, S M Riazul; Kwak, Kyung Sup

    2012-06-01

    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

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

    PubMed

    Li, Huan-Bang; Kohno, Ryuji

    2011-10-01

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

  7. 1 2007 Raj JainICC Tutorial, June 24, 2007 Next Generation Wireless Technologies:Next Generation Wireless Technologies

    E-print Network

    Jain, Raj

    . Ultra Wideband3. Ultra Wideband ! Ultra-Wideband: How it works ! FCC Rules on UWB ! Advantages of UWB ! Direct sequence (DS-UWB) ! Multi-Band OFDM ! Applications of UWB ! UWB Products #12;6 ©2007 Raj Jain Wideband 4. High Throughput WiFi: 802.11n 5. WiMAX Overview 6. WiMAX Technical Details 7. Other Competing

  8. A novel low power synchronization scheme for UWB IR architecture

    Microsoft Academic Search

    Qi Zhang; Yong Lian

    2009-01-01

    This paper presents a novel synchronization scheme that base on Baker Codes autocorrelation property for UWB impulse radio system. Simple threshold detection circuit is used to perform early quantization. An asynchronous pulse capture block is introduced to perform a direct down conversion of the UWB pulses from RF band to baseband. The new scheme provides run time synchronization tracking and

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

    PubMed

    Shimizu, Yuto; Anzai, Daisuke; Jianqing Wang

    2014-01-01

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

  10. PERFORMANCE EVALUATION OF IMPULSE RADIO ULTRA WIDE BAND WIRELESS SENSOR Lecointre1, 2

    E-print Network

    Boyer, Edmond

    900847 1 of 7 PERFORMANCE EVALUATION OF IMPULSE RADIO ULTRA WIDE BAND WIRELESS SENSOR NETWORKS of Wireless Sensor Networks (WSN) based on Impulse Radio Ultra Wideband (IR-UWB) over a new simulation-UWB PHYsical (PHY) and Medium Access Control (MAC) layer. Pulse collision is modeled according to the used time

  11. A Generalized Time Domain Multipath Channel and its Application in Ultra-Wide-band (UWB) Wireless Optimal Receiver Design: System Performance Analysis

    E-print Network

    Qiu, Robert Caiming

    system originated from the UWB radar target identification since 1965 [3,10]. Due to the potential of UWB receiver [16,26], and earlier work on UWB system channel modeling [17], UWB radar target characteristics century ago [1], on the diffraction of a pulse or a transient wave (acoustic or electromagnetic

  12. Hybrid UWB and WiMAX radio-over-multi-mode fibre for in-building optical networks

    NASA Astrophysics Data System (ADS)

    Perez, J.; Llorente, R.

    2014-01-01

    In this paper the use of hybrid WiMedia-defined ultra-wideband (UWB) and IEEE 802.16d WiMAX radio-over-fibre is proposed and experimentally demonstrated for multi-mode based in-building optical networks with the advantage of great immunity to optical transmission impairments. In the proposed approach, spectral coexistence of both signals must be achieved with negligible mutual interference. The experimental study performed addressed an indoor configuration with 50 ?m multi-mode fibres (MMF) and 850 nm vertical-cavity surface-emitting laser (VCSEL) transmitters. The results indicate that the impact of the wireless convergence in radio-over-multi-mode fibre (RoMMF) is significant for UWB transmissions, mainly due to MMF dispersion and electrooptical (EO) devices with limited bandwidth. On the other hand, WiMAX transmission is feasible for a 300 m MMF and 30 m wireless link in the presence of UWB, with -31 dBm WiMAX EVM.

  13. Comparative analysis of UWB deconvolution and feature-extraction algorithms for GPR landmine detection

    NASA Astrophysics Data System (ADS)

    Savelyev, Timofei G.; Sato, Motoyuki

    2004-09-01

    In this work we developed target recognition algorithms for landmine detection with ultra-wideband ground penetrating radar (UWB GPR). Due to non-stationarity of UWB signals their processing requires advanced techniques, namely regularized deconvolution, time-frequency or time-scale analysis. We use deconvolution to remove GPR and soil characteristics from the received signals. An efficient algorithm of deconvolution, based on a regularized Wiener inverse filter with wavelet noise level estimation, has been developed. Criteria of efficiency were stability of the signal after deconvolution, difference between the received signal and the convolved back signal, and computational speed. The novelty of the algorithm is noise level estimation with wavelet decomposition, which defines the noise level separately for any signal, independently of its statistics. The algorithm was compared with an iterative time-domain deconvolution algorithm based on regularization. For target recognition we apply singular value decomposition (SVD) to a time-frequency signal distribution. Here we compare the Wigner transform and continuous wavelet transform (CWT) for discriminant feature selection. The developed algorithms have been checked on the data acquired with a stepped-frequency GPR.

  14. Development of a Multiple-Input Multiple-Output Ultra-Wideband System Emulator G Tsao, K Sasloglou, L Petropoulakis, R Atkinson, I Andonovic, I A Glover

    E-print Network

    Atkinson, Robert C

    is work in progress. Keywords-component: UWB, MIMO, channel impulse response, channel frequency response I the frequency responses of sample UWB channels measured in time and frequency domains provide confidence is described for the characterization of indoor channels with sufficient spatial resolution and sufficient

  15. A 250 MHz 14 dB-NF 73 dB-Gain 82 dB-DR Analog Baseband Chain With Digital-Assisted DC-Offset Calibration for Ultra-Wideband

    Microsoft Academic Search

    Horng-Yuan Shih; Chien-Nan Kuo; Wei-Hsien Chen; Tzu-Yi Yang; Kai-Chenug Juang

    2010-01-01

    A 250 MHz analog baseband chain for ultra-wideband was implemented in a 1.2 V 0.13 ¿ m CMOS process. The chip has an active area of 0.8 mm2. In the analog baseband, PGAs and filters are carried out by current-mode amplifiers to achieve wide bandwidth and wide dynamic range of gain, as well as low noise and high linearity. Besides,

  16. In-line polarization-dependent microfiber interferometers and their applications in UWB signal generation.

    PubMed

    Zhao, Ping; Zhang, Jihua; Yu, Yuan; Dong, Jianji; Shi, Lei; Liu, Yang; Zhang, Xinliang

    2013-04-01

    A novel in-line polarization-dependent microfiber interferometer (PD-MFI) is proposed and experimentally demonstrated, which is tapered from a commercial polarization-maintaining fiber. Different from conventional MFIs, the transmission spectra of such MFIs are highly polarization-dependent, due to the mode-sensitive birefringence. The experimental results agree well with the theoretical predictions. Moreover, exploiting the polarization-dependent property of PD-MFIs, we demonstrate a simple and flexible scheme of generating polarity-switchable ultra-wideband pulses in the optical domain. Doublet pulses with a central frequency of 6.28 GHz and a 10-dB bandwidth of 7.86 GHz are obtained. Hence, with the advantages of being fiberized, simple fabrication and robustness, these PD-MFIs can be attractive elements in optical signal processing, optical sensing, optical fiber communication, and microwave photonics. PMID:23571913

  17. Channel Analysis and Estimation and Compensation of Doppler Shift in Underwater Acoustic Communication and Mitigation of IFI, ISI in Ultra-wideband Radio

    NASA Astrophysics Data System (ADS)

    Ahmed, Sadia

    Water occupies three fourth of earth's surface. The remaining one fourth is land. Although human habitats reside on land, there is no denying of the vital connection between land and water. The future sustainability of human species on this planet depends on wise utilization of all available resources, including that provided by the vast water world. Therefore, it is imperative to explore, understand, and define this massive, varying, and in many areas, unexplored water domain. The water domain exploration and data collection can be conducted using manned or unmanned vehicles, as allowed by the water environment. This dissertation addresses three of the key difficulties that occur during underwater acoustic communication among manned and/or unmanned vehicles and proposes feasible solutions to resolve those difficulties. The focus and the contributions of this research involve the following perspectives: 1) Representation of Underwater Acoustic Communication (UAC) Channels: Providing a comprehensive classification and representation of the underwater acoustic communication channel based on the channel environment. 2) Estimation and Compensation of Doppler Shift: Providing compensation algorithm to mitigate varying Doppler shift effect over subcarriers in UAC Orthogonal Frequency Division Multiplexing (OFDM) systems. 3) Mitigation of Inter-symbol Interference (ISI): Providing feasible solution to long delay spread causing ISI in Ultra-wideband channels.

  18. IEEE International Conference on Ultra-Wideband, Zurich, September 2005 Abstract--In this paper, we analyze the achievable location

    E-print Network

    services in the 3.1-10.6GHz band such as the wireless local area network (WLAN) standard IEEE802.11a short transmit pulses are necessary in a multi-path radio frequency channel to maintain an acceptable accuracy of the pulse arrival time. I. INTRODUCTION An application utilizing the radio frequency (RF

  19. UWB antenna characterization

    Microsoft Academic Search

    James S. McLean; Robert Sutton

    2008-01-01

    The characterization of UWB antennas is considered with emphasis placed on the determination of compact descriptors appropriate for UWB communications antennas. All of the descriptors can be derived from the antenna transfer function, thus providing a unified approach in which the transfer function is the basis for all of the subsequent computations. It is shown that the unambiguous determination of

  20. UWB magnetic antennas

    Microsoft Academic Search

    Hans Gregory Schantz

    2003-01-01

    Many commercial applications call for UWB antennas that are less prone to near-field coupling. Magnetic antennas are well suited for these applications, because the relatively large magnetic fields tend not to couple as strongly with near-by objects. The purpose of this article is to provide a brief overview of some UWB magnetic antennas. In particular, this paper will discuss large

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

    PubMed

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

    2009-08-01

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

  2. A CPW-fed circular wide-slot UWB antenna with wide tunable and flexible reconfigurable dual notch bands.

    PubMed

    Li, Yingsong; Li, Wenxing; Ye, Qiubo

    2013-01-01

    A coplanar waveguide (CPW)-fed circular slot antenna with wide tunable dual band-notched function and frequency reconfigurable characteristic is designed, and its performance is verified experimentally for ultra-wideband (UWB) communication applications. The dual band-notched function is achieved by using a T-shaped stepped impedance resonator (T-SIR) inserted inside the circular ring radiation patch and by etching a parallel stub loaded resonator (PSLR) in the CPW transmission line, while the wide tunable bands can be implemented by adjusting the dimensions of the T-SIR and the PSLR. The notch band reconfigurable characteristic is realized by integrating three switches into the T-SIR and the PSLR. The numerical and experimental results show that the proposed antenna has a wide bandwidth ranging from 2.7 GHz to 12 GHz with voltage standing wave ratio (VSWR) less than 2, except for the two notch bands operating at 3.8-5.9 GHz and 7.7-9.2 GHz, respectively. In addition, the proposed antenna has been optimized to a compact size and can provide omnidirectional radiation patterns, which are suitable for UWB communication applications. PMID:24222733

  3. 194 IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 53, NO. 1, JANUARY 2007 Channel Uncertainty in Ultra-Wideband

    E-print Network

    Porrat, Dana

    the channel conditions that allow duty-cycled direct-sequence spread spectrum (DSSS) and pulse position] show that direct-sequence spread-spectrum signals, when transmitted continuously (no duty cycle) over194 IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 53, NO. 1, JANUARY 2007 Channel Uncertainty

  4. Microwave Journal Feb. 2001 Technical Feature

    E-print Network

    Ha, Dong S.

    receivers and wideband antennas. Between 1977 to 1989, the USAF had a program in UWB system development of ultra wideband (UWB) communications and radar. The first part covered UWB communications, and here UWB and fundamental contributions to the field are presented. Terence W. Barrett UCI Vienna, VA Ultra wideband or UWB

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

    PubMed Central

    Liu, Xiaohui

    2013-01-01

    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

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

    PubMed

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

    2014-10-01

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

  7. UWB RADAR Receiver Architecture

    Microsoft Academic Search

    Nuno Paulino; Adolfo Steiger Garção; João Goes

    this chapter describes the operation of a radar system. The differences and advantages of using UWB signals in the radar system,\\u000a over traditional narrow band signals, are discussed. The radar equation, usually defined for narrow band signals, is redefined\\u000a for UWB signals. This new radar equation is used to analyze the echo signals from targets with basic shapes, resulting in

  8. IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 20, NO. 9, DECEMBER 2002 1767 Multistage Block-Spreading for Impulse Radio

    E-print Network

    Giannakis, Georgios

    . INTRODUCTION IMPULSE RADIO (IR) or ultra-wideband (UWB) com- munication systems receive increasing attention Block-Spreading for Impulse Radio Multiple Access Through ISI Channels Liuqing Yang, Student Member-short pulses, impulse radio (IR) has received increasing interest for multiple access (MA). When IRMA systems

  9. ANC-Based TOA Estimation with Lower Sampling Rates for UWB Systems

    Microsoft Academic Search

    Fan Li; Shouyin Liu; Yeong-Sam Kim; Jong-Wha Chong

    2007-01-01

    Abstract—High time resolution makes the UWB signal as a favor of the high accurate ranging technology. Since the bandwidth of a received UWB signal is very large, the Nyquist rate sampling becomes impractical. So energy detection (ED) algorithm with sub-Nyquist rate sampling becomes a feasible alternative. Though energy detection does not require accurate timing or pulse shapes, it suffers more

  10. ENHANCED POSITION LOCATION WITH UWB IN OBSTRUCTED LOS AND NLOS MULTIPATH ENVIRONMENTS

    E-print Network

    Minnesota, University of

    .15.4 [1]) is being revised and ultra wide- band (UWB) has been proposed as the underlying physical layer antennas. From simulation results we claim position location ac- curacy of around 34 cm with a pragmatic 4-element antenna array using 2.4GHz UWB pulses and 4-bit A/D converter at 24dB SNR. 1. INTRODUCTION

  11. A new denoising method for DS-UWB signal based on wavelet transform modulus maximum

    Microsoft Academic Search

    Yuanyuan Peng; Changqing Bai; Qingyan Zhang

    2010-01-01

    Narrowband pulse can be seen as singularity when it is adopted to transmit Direct Sequence Ultra-Wide Band (DS-UWB) signals. The remarkable property of wavelet transform is that it has ability to characterize the singularities of signals. In the UWB system there are different propagation characteristics for the modulus maxima of signal and noise with the increasing decomposition scales, theoretical and

  12. Cramér-Rao Lower Bounds for the Synchronization of UWB Signals

    Microsoft Academic Search

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

    2005-01-01

    In this paper, we present Cramer-Rao lower bounds (CRLBs) for the synchronization of UWB signals which should be tight lower bounds for the theoretical performance limits of UWB synchronizers. The CRLBs are investigated for both single pulse systems and time-hopping systems in AWGN and multipath channels. Insights are given into the relationship between CRLBs for different Gaussian monocycles. An approximation

  13. Cramer-Rao lower bounds for the time delay estimation of UWB signals

    Microsoft Academic Search

    J. Zhang; R. A. Kennedy; T. D. Abhayapala

    2004-01-01

    In this paper, we present the Cramer-Rao lower bounds (CKLBs) for the time delay estimation of UWB signals which could be tight lower bounds for the theoretical performance limits of UWB synchronizers. The CRLBs are investigated for both single pulse systems and time hopping systems in AWGN and multipath channels. Insights are given into the relationship between CRLBs for different

  14. Electromagnetics-Related Aspects of Signaling and Signal Processing for UWB Short Range Radios*

    E-print Network

    Southern California, University of

    Electromagnetics-Related Aspects of Signaling and Signal Processing for UWB Short Range Radios* A in electromagnetic-related aspects of UWB signaling schemas and signal processing. First, pulse shaping is developed in both the transmitter and receiver, and signal processing at the receiver end. To create efficient

  15. An Original Antenna for Transient High Power UWB Arrays: The Shark Antenna

    Microsoft Academic Search

    Laurent Desrumaux; Adrien Godard; Michèle Lalande; Valérie Bertrand; Joël Andrieu; Bernard Jecko

    2010-01-01

    A novel ultrawideband (UWB) antenna, called the Shark antenna, and designed especially for transient applications is proposed in this paper. A Shark antenna array is also conceived in order to obtain a high power UWB pulse radiation source through the frequency band [800 MHz-8 GHz]. For this application, the elementary antenna must be compact, non-dispersive, and the array must have

  16. Detection and recognition of radar objects at sounding by high-power ultrawideband pulses

    Microsoft Academic Search

    Vladimir I. Koshelev

    2007-01-01

    By present, ultrawideband (UWB) radiation sources with megavolt efficient potential have been created. This is technical basis for development of UWB radars for remote object sounding. The paper gives special attention to analysis of investigation results of methods for detection and recognition of remote radar objects at sounding by high-power UWB pulses. To detect UWB signals at the noise and

  17. An Ultrawideband Radar Based Pulse Sensor for Arterial Stiffness Measurement

    Microsoft Academic Search

    Teh-Ho Tao; Shin-Jen Hu; Jla-Hung Peng; Su-Chen Kuo

    2007-01-01

    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

  18. A multicarrier interleave-division uwb system

    Microsoft Academic Search

    Kai Yang; Xiaodong Wang

    2006-01-01

    We propose a multicarrier interleave-division multiple-access scheme for ultra-wideband wireless communications. For the uplink, a chip-level interleaving method at the transmitter with a simple turbo receiver is proposed to effectively suppress the frequency-selective fading and multiple-access interference. Both hard and soft frequency notching methods are suggested to suppress the narrowband interference. For the downlink, a two-layer interleaving scheme is proposed,

  19. A compact CPW fed serrated UWB antenna

    Microsoft Academic Search

    V. A Shameena; Sarah Jacob; C. K Aanandan; K Vasudevan; P. Mohanan

    2011-01-01

    A compact CPW-fed planar monopole antenna for ultra-wideband applications is presented and investigated. The proposed antenna with a small size of 20 mm x26 mm x 1.6 mm is composed of a staircase shaped radiating element fed by a CPW feed line, and an inverted stair-style ground. The measured results agree reasonably with the simulated ones. The proposed antenna yields

  20. A Compact CPW-Fed Monopole Antenna with E-Shaped Slot for 5 GHz\\/6 GHz Band-Notched Ultra-Wideband Applications

    Microsoft Academic Search

    Jyoti R. Panda; Rakhesh S. Kshetrimayum

    2009-01-01

    Planar ultrawideband (UWB) antenna with an E-shaped slot for a 5\\/6 GHz band notched characteristics is presented. The antenna is a planar structure and has a compact area of 25??25 mm2, which covers the frequency band from 3.1 GHz to 10.6 GHz (VSWR ¿ 2 ). The antenna has a circular slot cut in the ground plane and a circular