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2005 IEEE International Conference on Ultra-Wideband最新文献

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Ultra wideband L-loop antenna 超宽带l环天线
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-12-01 DOI: 10.1109/ICU.2005.1569984
K.Y. Yazdanboost, R. Kohno
{"title":"Ultra wideband L-loop antenna","authors":"K.Y. Yazdanboost, R. Kohno","doi":"10.1109/ICU.2005.1569984","DOIUrl":"https://doi.org/10.1109/ICU.2005.1569984","url":null,"abstract":"The antenna design for ultra wideband (UWB) signal radiation is one of the main challenges of the UWB system, especially when low-cost, geometrically small and radio efficient structures are required for typical applications. This study presents a novel printed loop antenna with introducing an L shape portion to its arms. The antenna offers excellent performance for lower-band frequency of UWB system, ranging from 3.1 GHz to 5.1 GHz. The antenna exhibits a 10 dB return loss bandwidth over the entire frequency band. The antenna is designed on FR4 substrate and fed with 50 ohms coupled tapered transmission line. It is found that the lower frequency band depends on the L portion of the loop antenna; however the upper frequency limit was decided by the taper transmission line. Though with very simple geometry, the results are satisfactory.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114915910","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: 23
Mitigation of sampling-induced errors in delay estimation 延迟估计中采样误差的减小
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-12-01 DOI: 10.1109/ICU.2005.1570021
Y. Qi, R. Kohno
{"title":"Mitigation of sampling-induced errors in delay estimation","authors":"Y. Qi, R. Kohno","doi":"10.1109/ICU.2005.1570021","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570021","url":null,"abstract":"Delay estimation has been well accepted as an important approach to ranging with a UWB (ultra-wide band) system. Delay estimation errors due to digital sampling can be considerably large at a low sampling frequency. In this paper, we investigate reduction of such errors in both analytical and practical aspects. A delay estimation scheme based on the so-called simplified maximum likelihood formulation is first derived, and is further shown to be optimal in the sense that its error variance converges to the corresponding theoretical lower limit as the sampling frequency is sufficiently high. Next, an iterative scheme for first arrival detection is devised in light of the near-far robustness in multiuser detection. This scheme can effectively cope with a frequent UWB environment where the first arriving signal component may not be dominant among multipath components. Efficient reduction of sampling-induced errors and a low computation complexity are main advantages of the proposed schemes.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134383846","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
Overview of research and development activities in NICT UWB consortium NICT超宽带联盟研究与开发活动概述
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-12-01 DOI: 10.1109/ICU.2005.1570079
R. Kohno, K. Takizawa
{"title":"Overview of research and development activities in NICT UWB consortium","authors":"R. Kohno, K. Takizawa","doi":"10.1109/ICU.2005.1570079","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570079","url":null,"abstract":"This paper presents an overview of research and development (R&D) activities on ultra-wideband (UWB) technologies in the NICT UWB consortium. NICT started to research UWB technologies in 2002, and organized the UWB consortium in cooperation with more than 20 companies and 6 universities in Japan. We have done and are doing a lot of R&D activities, which include developing MMIC chips, UWB antennas and UWB testbed, measuring UWB signal propagation, and making standards for IEEE 802.15 wireless personal area networks (WPANs). Our activities in 24-GHz band UWB systems are briefly introduced, where multifunctional UWB systems have been investigated. Finally, UWB testroom is introduced, which is a test site for evaluating the spatial distributions of UWB signals by using a 3D scanner.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123496401","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: 7
Initial timing acquisition for asynchronous DS-UWB transmissions by burst synchronization signal 基于突发同步信号的异步DS-UWB传输初始时序采集
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-12-01 DOI: 10.1109/ICU.2005.1570015
M. Hernandez, R. Kohno
{"title":"Initial timing acquisition for asynchronous DS-UWB transmissions by burst synchronization signal","authors":"M. Hernandez, R. Kohno","doi":"10.1109/ICU.2005.1570015","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570015","url":null,"abstract":"We consider the initial timing acquisition for asynchronous DS-UWB transmissions in a distributed network topology, i.e., no common timing reference and neither synchronization among terminals are provided. Thus, when an arbitrary terminal in active mode (at switch-on or after sleeping period) needs to establish communication with reachable terminals, it listens for a common synchronization signal. Such a low-duty cycle synchronization signal is broadcasted by active terminals which accept a communication link. Thus, a simplified maximum likelihood (ML) algorithm is provided for initial timing acquisition. This estimator offers good performance in UWB radio channels independently of the multipath intensity profile for either fast and slow fading. Additionally, the proposed method provides estimation of the average SNR per channel path, multipath intensity profile, and noise plus interference power spectral density.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122268110","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
Experimental examination of antennas for a UWB positioning system 超宽带定位系统天线的实验研究
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-12-01 DOI: 10.1109/ICU.2005.1569997
Y. Takeuchi, Y. Shimizu, Y. Sanada
{"title":"Experimental examination of antennas for a UWB positioning system","authors":"Y. Takeuchi, Y. Shimizu, Y. Sanada","doi":"10.1109/ICU.2005.1569997","DOIUrl":"https://doi.org/10.1109/ICU.2005.1569997","url":null,"abstract":"In this paper, several combinations of antennas for a UWB positioning system are examined. As the UWB pulse duration is very short, the time resolution is very high. Therefore, UWB is suitable for positioning systems. However, depending on the characteristics of the antennas, the pulse waveform is distorted and received signal power is reduced. Therefore, the characteristics of the transmission and reception antennas influence to the accuracy of the positioning system. In this paper, the received signal waveform with different combinations of transmission and reception antennas is measured, and the performance of the pulse synchronization is investigated.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"168 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127642795","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: 9
On high data rate space-time codes for ultra-wideband systems 超宽带系统中高数据速率空时码的研究
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1569991
C. Abou-Rjeily, N. Daniele, J. Belfiore
{"title":"On high data rate space-time codes for ultra-wideband systems","authors":"C. Abou-Rjeily, N. Daniele, J. Belfiore","doi":"10.1109/ICU.2005.1569991","DOIUrl":"https://doi.org/10.1109/ICU.2005.1569991","url":null,"abstract":"In this paper, the advantage of applying space-time (ST) coding on ultra wideband (UWB) systems is discussed. In order to achieve very high data rates and important performance gains combined pulse position modulation (PPM) and pulse amplitude modulation (PAM) constellations along with full diversity and full rate ST codes are used at the transmitter side. The proposed coding-decoding scheme takes into account the nature of the highly frequency selective channel and the multi-dimensional constellation. Furthermore, the coding gain is optimized over different constellations and the possibility of compromising performance to lower peak-to-average power ratios (PAPR) is discussed. Moreover, for simplified receiver structures, V-BLAST decoding scheme was adapted to multi-dimensional signals. Results show considerable performance gains and better immunity against inter symbol interference (ISI) and multi user interference (MUI).","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"11 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":"115418277","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: 6
TOA estimation with different IR-UWB transceiver types 不同IR-UWB收发器类型的TOA估计
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1570025
I. Guvenc, Z. Sahinoglu
{"title":"TOA estimation with different IR-UWB transceiver types","authors":"I. Guvenc, Z. Sahinoglu","doi":"10.1109/ICU.2005.1570025","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570025","url":null,"abstract":"In this paper, performances of stored-reference (SR), transmitted-reference (TR), and energy detection (ED) based time of arrival (TOA) estimation techniques are analyzed for impulse-radio ultra-wideband (IR-UWB) systems. Various maximum likelihood estimation approaches are investigated under different observation models, and a new estimator that exploits the noise statistics and power delay profile of the channel is proposed. Simulation results show that ED and TR perform well if the sampling rate is much smaller than the Nyquist rate. Also, exploiting the channel and noise statistics considerably improves the accuracy of peak selection.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"38 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":"125267746","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
Measurement and modelling of an UWB channel at hospital 医院超宽带信道的测量和建模
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1569968
L. Hentila, A. Taparungssanagorn, Harri Viittala, Matti Hämäläinen
{"title":"Measurement and modelling of an UWB channel at hospital","authors":"L. Hentila, A. Taparungssanagorn, Harri Viittala, Matti Hämäläinen","doi":"10.1109/ICU.2005.1569968","DOIUrl":"https://doi.org/10.1109/ICU.2005.1569968","url":null,"abstract":"This paper describes the results of an ultra wideband (UWB) channel measurements and modelling from 3.1 to 6.0 GHz carried out at the Oulu University Hospital. Mainly line-of-sight (LOS) channels were measured having transmitter-receiver separation from 3 to 6 m. The modelling is done in time domain and in frequency domain, and the results are compared with. Channel parameters that are corresponding to the modified Saleh-Valenzuela (SV) model in time domain and autoregressive (AR) model in frequency domain are extracted from the measurement data. Also, delay spreads and path losses are examined. In the study, the effect of the huge frequency diversity over the UWB band on the path loss is pointed out.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"104 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":"115472974","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: 37
Propagation effects in UWB body area networks 超宽带体域网络中的传播效应
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1569949
T. Zasowski, G. Meyer, F. Althaus, A. Wittneben
{"title":"Propagation effects in UWB body area networks","authors":"T. Zasowski, G. Meyer, F. Althaus, A. Wittneben","doi":"10.1109/ICU.2005.1569949","DOIUrl":"https://doi.org/10.1109/ICU.2005.1569949","url":null,"abstract":"Due to the ongoing miniaturization of electronic devices and due to a multitude of applications, wireless body area networks (WBANs) have gained much interest recently. Ultra wideband (UWB) communication is one promising transmission technology for WBANs due to reduced hardware complexity. To optimize receiver structures and antennas for UWB WBANs it is necessary to know the propagation mechanisms at the human body. In this paper, we focus on transmission at the head and consider direct transmission, surface waves, reflections, and diffraction as possible propagation mechanisms in the frequency range between 1.5-8 GHz. We show theoretically and by measurement results that the direct path is attenuated such that direct transmission through the head is negligible. Based on measurements we conclude by process of elimination that diffraction is the main propagation mechanism around the human body and that surface waves and reflections are negligible. Finally, we discuss the impact of the propagation mechanisms on the UWB WBAN communication system.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"1 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":"129769277","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: 69
UWB transmitted reference signaling schemes - part II: narrowband interference analysis 超宽带传输参考信令方案。第2部分:窄带干扰分析
2005 IEEE International Conference on Ultra-Wideband Pub Date : 2005-09-05 DOI: 10.1109/ICU.2005.1570055
Tony Q. S. Quek, M. Win, D. Dardari
{"title":"UWB transmitted reference signaling schemes - part II: narrowband interference analysis","authors":"Tony Q. S. Quek, M. Win, D. Dardari","doi":"10.1109/ICU.2005.1570055","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570055","url":null,"abstract":"In Part I (T.Q.S. Quek et al., 2005) of this two-part paper, we provide uncoded bit error probability (BEP) analysis of various transmitted-reference (TR) schemes by developing an analytical framework based on the sampling expansion approach. In this paper, the effect of narrowband interference (NBI) is taken into account to derive uncoded BEP expressions of TR and differential TR (DTR) signaling with an autocorrelation receiver (AcR). For simplicity, our NBI is modeled as a single tone interferer with Rayleigh distributed amplitude and a uniformly distributed random phase. We quantify the effect of NBI and channel power dispersion profile (PDP) on the optimum integration interval of AcR. Unlike the NBI-free situation, the optimum integration interval of AcR is not necessarily close to the delay spread, and depends on the signal-to-interference ratio (SIR), the signal-to-noise ratio (SNR) and the channel PDP. Furthermore, our results also allow us to compare the NBI sensitivity of TR and DTR signaling.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"18 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":"129659399","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
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