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2005 IEEE International Conference on Ultra-Wideband最新文献

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Proposal for an MB-OFDM UWB system simultaneously undertaking ranging and communications 一种同时进行测距和通信的MB-OFDM超宽带系统的方案
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1093/ietfec/e89-a.11.3075
Yasuhiro Ohhikata, Takehiko Kobayashi
{"title":"Proposal for an MB-OFDM UWB system simultaneously undertaking ranging and communications","authors":"Yasuhiro Ohhikata, Takehiko Kobayashi","doi":"10.1093/ietfec/e89-a.11.3075","DOIUrl":"https://doi.org/10.1093/ietfec/e89-a.11.3075","url":null,"abstract":"This paper proposes a novel method which simultaneously undertakes ranging and communications based on the PHY of MB-OFDM technology. A transmitter modulates one or multiple OFDM subcarriers with a low-frequency (1.05 MHz) ranging signal; and a receiver samples the received signal at a 3.2-MHz sampling rate to estimate the time of arrival of the ranging signal. This configuration and an additional protocol supporting bidirectional ranging achieved a 130-mm resolution (equivalent to 2.15 GHz sampling). This method does not modify the PHY but only changes the baseband signal processing. The validity of this method was demonstrated using computer simulation and prototype experiments.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114840520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
A spatial RAKE-receiver for real-time UWB-IR applications 用于实时UWB-IR应用的空间rake接收器
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1569958
C. Limbodal
{"title":"A spatial RAKE-receiver for real-time UWB-IR applications","authors":"C. Limbodal","doi":"10.1109/ICU.2005.1569958","DOIUrl":"https://doi.org/10.1109/ICU.2005.1569958","url":null,"abstract":"Ultra wideband systems are hard to implement in standard CMOS technology. In this paper we present a novel spatial RAKE-receiver, exploring mixed-mode circuits for symbol detection and inverter delay lines for synchronization. The receiver is implemented as a RAKE structure combining digital shift registers with analog computation in a series of parallel taps of a synchronizing delay line. In each parallel bit stream the incoming signal is cross-correlated with a stored template. By combining a delay line and a mixed-mode correlator we can explore multipath reflections in a time domain statistical computation for symbol recovery.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"33 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125609174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Location accuracy of an UWB localization system in a multi-path environment 多路径环境下超宽带定位系统的定位精度
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1570023
M. Tuchler, V. Schwarz, A. Huber
{"title":"Location accuracy of an UWB localization system in a multi-path environment","authors":"M. Tuchler, V. Schwarz, A. Huber","doi":"10.1109/ICU.2005.1570023","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570023","url":null,"abstract":"In this paper, we analyze the achievable location accuracy of a wireless localization system using pulse arrival time measurements of ultra-wideband (UWB) pulses. We briefly review the limits on the ranging accuracy given the regulatory constraints of UWB emissions and the parameters of the UWB transceiver hardware used for the localization system. We show that the accuracy of the arrival time measurements does not depend on the pulse spectrum in a very small measurement interval equal to half the inverse of the pulse center frequency. For measuring the arrival time outside this (usually tiny) measurement interval, we show that the measurement accuracy declines considerably and that it furthermore depends on the pulse bandwidth. We also show why short transmit pulses are necessary in a multi-path radio frequency channel to maintain an acceptable accuracy of the pulse arrival time.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127717002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 44
Analysis of QPSK transmitted-reference systems QPSK传输参考系统分析
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1570039
J. Romme, Klaus Witrisal
{"title":"Analysis of QPSK transmitted-reference systems","authors":"J. Romme, Klaus Witrisal","doi":"10.1109/ICU.2005.1570039","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570039","url":null,"abstract":"The usage of an additional autocorrelation branch is proposed for the demodulation of transmitted reference signals, to both relax the demands on the hardware implementation and allow for QPSK-TR signalling. The proposed autocorrelation receiver is proven to perform a complex-valued autocorrelation. Based on this insight, a discrete-time equivalent system model is derived, including a statistical characterization of the system taking into account noise, as well as intra- and inter-symbol-interference (IISI). The performance of a fractionally sampled QPSK-TR system is presented, operating at different data rates in different environments.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132509189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Multi-user capabilities of UWBFM communications systems UWBFM通信系统的多用户能力
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1570071
J. Gerrits, J. Farserotu, J. Long
{"title":"Multi-user capabilities of UWBFM communications systems","authors":"J. Gerrits, J. Farserotu, J. Long","doi":"10.1109/ICU.2005.1570071","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570071","url":null,"abstract":"This paper analyzes the multi-user capabilities of UWBFM communications systems. Multiple users operating at the same RF center frequency will be confronted with multiple-access interference that will ultimately limit the performance. Two particular cases are investigated: two users of different power and N users of equal power. Expressions are given for the receiver processing gain, the subcarrier SNR in the two-user case as well as the maximum number of equal power users and the capacity of the multi-user UWBFM communications system.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129815955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
A framework for performance analysis of TH-UWB communications TH-UWB通信性能分析框架
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1570049
M. D. Renzo, F. Graziosi, F. Santucci
{"title":"A framework for performance analysis of TH-UWB communications","authors":"M. D. Renzo, F. Graziosi, F. Santucci","doi":"10.1109/ICU.2005.1570049","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570049","url":null,"abstract":"Ultra wide band (UWB) has been proposed in recent years as a suitable transmission technique for various applications in the wireless context and is currently under consideration of standard bodies for e.g. wireless personal area networks. UWB is also inherently indicated for distributed ad-hoc wireless networks and, in particular, for sensor networks. Since operations in shared radio resource environments are crucial to any wireless system, this paper proposes an investigation of the performance of UWB in a multi-user environment with specific interest on the time hopping (TH) alternative. Specifically, the expression of the SINR (signal-to-(noise + interference) ratio) is derived in the presence of a generic family of (multi-level) hopping codes, thus removing the common assumption of independent and identically distributed (i.i.d.) random sequences. The key point is to map a TH-UWB system with multi-level sequences into an equivalent direct sequence (DS) system with binary sequences. Application of the proposed analytical framework includes evaluation of multiple access performance and accurate analysis of synchronization algorithms. While the first step of the analysis assumes an additive white Gaussian noise (AWGN) channel, the model is further extended to incorporate the behaviour of the wireless channel, thus deriving the outage probability in a log-normal shadowed channel, by resorting to the well-known Fenton-Wilkinson approximation.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131166529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Two novel FDTD based UWB indoor propagation models 基于时域有限差分的两种新型超宽带室内传播模型
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1569970
Yan Zhao, Y. Hao, C. Parini
{"title":"Two novel FDTD based UWB indoor propagation models","authors":"Yan Zhao, Y. Hao, C. Parini","doi":"10.1109/ICU.2005.1569970","DOIUrl":"https://doi.org/10.1109/ICU.2005.1569970","url":null,"abstract":"This paper presents two novel finite-difference time-domain (FDTD) based methods for UWB propagation modelling. For the dispersive FDTD model, Debye material is considered and the frequency dependent material information is discretely converted into time domain by using differential equation-based algorithm; for the sub-band FDTD model, the whole ultra wideband (3.1-10.6 GHz) is divided into 11 subbands with 700 MHz bandwidth and each sub-band is simulated separately using measured frequency-dependent material properties. Both the dispersive FDTD and the sub-band FDTD methods are verified by comparing reflection coefficients obtained from one-dimensional (1-D) simulation and analytical equations. The results from two-dimensional (2-D) dispersive FDTD, subband FDTD and UWB ray tracing simulations are obtained and discussed.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"40 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114114269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 17
Upper bound on the probability of error for repetition MB-OFDM in the Rayleigh fading channel 瑞利衰落信道中重复MB-OFDM误差概率的上界
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1569986
B. Gaffney, A. Fagan, S. Rickard
{"title":"Upper bound on the probability of error for repetition MB-OFDM in the Rayleigh fading channel","authors":"B. Gaffney, A. Fagan, S. Rickard","doi":"10.1109/ICU.2005.1569986","DOIUrl":"https://doi.org/10.1109/ICU.2005.1569986","url":null,"abstract":"An approximate upper bound on the bit-error rate (BER) of a quadrature phase shift keying (QPSK) OFDM system with symbol repetition using any convolutional code in the Rayleigh multipath channel is determined. The upper bound is approximated with appropriate approximations for the sum of Rayleigh random variables and the Q function. We then demonstrate, through simulation, that these upper bounds are good at the BER's of interest in a multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband system and give good insight into the performance of these systems in practical channels.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114328059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Probe fed stacked patch antenna for UWB 用于超宽带的探针馈电堆叠贴片天线
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1569965
H. Ghannoum, S. Bories, C. Roblin
{"title":"Probe fed stacked patch antenna for UWB","authors":"H. Ghannoum, S. Bories, C. Roblin","doi":"10.1109/ICU.2005.1569965","DOIUrl":"https://doi.org/10.1109/ICU.2005.1569965","url":null,"abstract":"A microstrip patch antenna with two E-shaped stacked patches for UWB sectoral applications is proposed in this paper. The E-shaped patch antenna has an impedance bandwidth of about 34%. By adding a second E-shaped patch at the top of the first patch a bandwidth of 54% has been obtained. The characteristic dimensions of the second patch as well as the shift between the two patches have been optimized to achieve the ultra-wide bandwidth and radiation pattern stability over the whole band. The distorting nature of this antenna has been quantified using time domain characterization tools and the influence of the ground plane on impedance bandwidth and radiation has been studied.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127396374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Low power consuming pulse detector 低功耗脉冲检测器
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1569960
P. Rulikowski, V. Sokol, J. Barrett
{"title":"Low power consuming pulse detector","authors":"P. Rulikowski, V. Sokol, J. Barrett","doi":"10.1109/ICU.2005.1569960","DOIUrl":"https://doi.org/10.1109/ICU.2005.1569960","url":null,"abstract":"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 230 mV. The circuit draws a quiescent current of 1.8 mA from a single 3.6 V source and is therefore suitable for battery-powered devices. The designed pulse detector is sensitive only to the input signal level regardless of the pulse shape, which is particularly advantageous in severe multipath conditions.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121198992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
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