Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267883
Zhenyu Zhang, F. Zeng, L. Ge
Based on the analysis of the properties of time-hopping (TH) sequences, this paper investigates the multiple-access interference (MAI) in multiple-access ultra-wideband (UWB) wireless communication system. By the transformation of signal model, the hopping format is described in terms of binary TH sequences. The relation between MAI and TH correlation function are formulated. The bit error rate (BER) performance in the presence of MAI is evaluated by both theoretical analysis and computer simulations.
{"title":"Multiple-access interference in relation to time-hopping correlation properties in multiple-access UWB system","authors":"Zhenyu Zhang, F. Zeng, L. Ge","doi":"10.1109/UWBST.2003.1267883","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267883","url":null,"abstract":"Based on the analysis of the properties of time-hopping (TH) sequences, this paper investigates the multiple-access interference (MAI) in multiple-access ultra-wideband (UWB) wireless communication system. By the transformation of signal model, the hopping format is described in terms of binary TH sequences. The relation between MAI and TH correlation function are formulated. The bit error rate (BER) performance in the presence of MAI is evaluated by both theoretical analysis and computer simulations.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128052976","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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267884
Jin Tang, Zhengyuan Xu, Ping Liu
Traditional pulse position modulation based ultra-wideband (UWB) communication system transmits short pulses whose positions carry user's data information. Using different time-hopping sequences, multiple access is enabled. We address blind multiuser channel estimation after following a pulse-rate discrete-time channel model. The model can be regarded in a tri-linear structure and also resembles a code-division multiple access (CDMA) system with newly defined hopping-code dependent matrices for each user. Considering that either the mean or covariance of received signals contains sufficient information for all unknown channels, least squares and covariance matching ideas are successfully applied for channel estimation. Performance of each estimator is analyzed and also verified by computer simulations.
{"title":"Mean and covariance based estimation of multiple access UWB channels","authors":"Jin Tang, Zhengyuan Xu, Ping Liu","doi":"10.1109/UWBST.2003.1267884","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267884","url":null,"abstract":"Traditional pulse position modulation based ultra-wideband (UWB) communication system transmits short pulses whose positions carry user's data information. Using different time-hopping sequences, multiple access is enabled. We address blind multiuser channel estimation after following a pulse-rate discrete-time channel model. The model can be regarded in a tri-linear structure and also resembles a code-division multiple access (CDMA) system with newly defined hopping-code dependent matrices for each user. Considering that either the mean or covariance of received signals contains sufficient information for all unknown channels, least squares and covariance matching ideas are successfully applied for channel estimation. Performance of each estimator is analyzed and also verified by computer simulations.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128395973","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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267868
B. Denis, J. Keignart, N. Daniele
The ultra wideband (UWB) radiolocation functionality usually relies on the ability to perform a very precise estimation of the time of flight (TOF). Unfortunately, in spite of the fine performances demonstrated by the UWB systems, indoor dense multipath channels may alter the precision of the range estimate from severe blockage situations. This paper addresses the general problem of non line of sight (NLOS) errors in the specific context of UWB range estimation. Typical ranging errors due to the NLOS propagation are exhibited by deriving experimental results from real indoor VNA measurements into realistic statistical error models.
{"title":"Impact of NLOS propagation upon ranging precision in UWB systems","authors":"B. Denis, J. Keignart, N. Daniele","doi":"10.1109/UWBST.2003.1267868","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267868","url":null,"abstract":"The ultra wideband (UWB) radiolocation functionality usually relies on the ability to perform a very precise estimation of the time of flight (TOF). Unfortunately, in spite of the fine performances demonstrated by the UWB systems, indoor dense multipath channels may alter the precision of the range estimate from severe blockage situations. This paper addresses the general problem of non line of sight (NLOS) errors in the specific context of UWB range estimation. Typical ranging errors due to the NLOS propagation are exhibited by deriving experimental results from real indoor VNA measurements into realistic statistical error models.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121943900","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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267841
R. Johnk, D.R. Navotny, C. Grosvenor, N. Canales, J. Veneman
This paper summarizes results obtained from time-domain full-bandwidth emissions measurements of selected ultrawideband (UWB) transmitting devices. Brief descriptions of two NIST-developed measurement systems are provided. High-fidelity time-domain waveforms are shown, along with associated amplitude spectra for several devices. Results are shown for both conducted and radiated emissions from UWB devices.
{"title":"Time-domain measurements of radiated and conducted ultrawideband emissions","authors":"R. Johnk, D.R. Navotny, C. Grosvenor, N. Canales, J. Veneman","doi":"10.1109/UWBST.2003.1267841","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267841","url":null,"abstract":"This paper summarizes results obtained from time-domain full-bandwidth emissions measurements of selected ultrawideband (UWB) transmitting devices. Brief descriptions of two NIST-developed measurement systems are provided. High-fidelity time-domain waveforms are shown, along with associated amplitude spectra for several devices. Results are shown for both conducted and radiated emissions from UWB devices.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116185895","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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267848
N. August, W. Chung, D. Ha
This paper investigates energy efficient methods of increasing data rate for m-ary pulse position modulation (PPM) of impulse-based ultra wideband (UWB) systems in a multipath environment. The data rate of m-ary PPM can be increased by decreasing the pulse repetition interval (PRI) and/or increasing the number of bits transmitted per symbol. However, increasing the data rate beyond a certain limit degrades energy efficiency in a multipath environment. We investigate the relationship between data rate and energy efficiency and seek suitable bounds on the number of bits per symbol and the PRI.
{"title":"Energy efficient methods of increasing data rate for ultrawideband (UWB) communications systems","authors":"N. August, W. Chung, D. Ha","doi":"10.1109/UWBST.2003.1267848","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267848","url":null,"abstract":"This paper investigates energy efficient methods of increasing data rate for m-ary pulse position modulation (PPM) of impulse-based ultra wideband (UWB) systems in a multipath environment. The data rate of m-ary PPM can be increased by decreasing the pulse repetition interval (PRI) and/or increasing the number of bits transmitted per symbol. However, increasing the data rate beyond a certain limit degrades energy efficiency in a multipath environment. We investigate the relationship between data rate and energy efficiency and seek suitable bounds on the number of bits per symbol and the PRI.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"22 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120998040","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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267891
Yoshiyuki Suzuki, Takehiko Kobayashi
Although ultra wideband (UWB) propagation in indoor environments has been intensively studied, there have, as far we know, been no published studies of UWB propagation in desktop environments, where wireless personal area networks are expected to be most commonly employed. Short-range propagation measurements were carried out using UWB and continuous wave (CW) signals on a rectangular metal plate simulating typical desks with and without a low vertical metal partition panels. The frequency of the UWB signal spanned from 3.1 to 10.6 GHz and that of the CW signal was 6.85 GHz. A vector network analyzer and two omnidirectional UWB antennas were used to obtain frequency-domain response of the propagation paths. With the partition panel, the CW reception level showed approximately a 36-dB spatial variation, induced by the interference between the direct and the reflected waves, but the UWB reception level had no particular plunges. We also measured the additional losses when the propagation paths were blocked with a human arm and when the antenna was covered with a human palm. These losses were found to be 10 to 12 dB caused by an arm; and 6 to 7 dB caused by a palm.
{"title":"Ultra wideband signal propagation in desktop environments","authors":"Yoshiyuki Suzuki, Takehiko Kobayashi","doi":"10.1109/UWBST.2003.1267891","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267891","url":null,"abstract":"Although ultra wideband (UWB) propagation in indoor environments has been intensively studied, there have, as far we know, been no published studies of UWB propagation in desktop environments, where wireless personal area networks are expected to be most commonly employed. Short-range propagation measurements were carried out using UWB and continuous wave (CW) signals on a rectangular metal plate simulating typical desks with and without a low vertical metal partition panels. The frequency of the UWB signal spanned from 3.1 to 10.6 GHz and that of the CW signal was 6.85 GHz. A vector network analyzer and two omnidirectional UWB antennas were used to obtain frequency-domain response of the propagation paths. With the partition panel, the CW reception level showed approximately a 36-dB spatial variation, induced by the interference between the direct and the reflected waves, but the UWB reception level had no particular plunges. We also measured the additional losses when the propagation paths were blocked with a human arm and when the antenna was covered with a human palm. These losses were found to be 10 to 12 dB caused by an arm; and 6 to 7 dB caused by a palm.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126923910","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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267893
X. Wu, Zhi Ning Chen, M. Chia
Requirements for the antennas in wireless communication systems are presented, from a systems point of view. Differences between narrowband and ultrawideband systems in assessing system performance are discussed. Several parameters are introduced for the antennas in ultra-wideband wireless communication systems, to evaluate the performance of antennas based on the system requirements. As an example, a transmitting/receiving antenna system comprising two identical planar bow-tie antennas is analyzed numerically and experimentally in both time and frequency domains. By the introduced parameters, the effects of source and template pulses on the performance of the antenna system are also investigated.
{"title":"Note on antenna design in UWB wireless communication systems","authors":"X. Wu, Zhi Ning Chen, M. Chia","doi":"10.1109/UWBST.2003.1267893","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267893","url":null,"abstract":"Requirements for the antennas in wireless communication systems are presented, from a systems point of view. Differences between narrowband and ultrawideband systems in assessing system performance are discussed. Several parameters are introduced for the antennas in ultra-wideband wireless communication systems, to evaluate the performance of antennas based on the system requirements. As an example, a transmitting/receiving antenna system comprising two identical planar bow-tie antennas is analyzed numerically and experimentally in both time and frequency domains. By the introduced parameters, the effects of source and template pulses on the performance of the antenna system are also investigated.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128566666","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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267886
S. Hanna
This paper presents some of the challenges that face the introduction of ultra-wideband (UWB) technology in wireless applications intended for commercial use, summarizes relevant regulatory and standards developments, and addresses potential implications on spectrum management and radio regulations.
{"title":"Spectrum management issues relevant to the introduction of ultra-wideband technology","authors":"S. Hanna","doi":"10.1109/UWBST.2003.1267886","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267886","url":null,"abstract":"This paper presents some of the challenges that face the introduction of ultra-wideband (UWB) technology in wireless applications intended for commercial use, summarizes relevant regulatory and standards developments, and addresses potential implications on spectrum management and radio regulations.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114445642","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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267811
Leonard E. Miller
A methodology is shown for predicting the effect of pulsed UWB communication waveforms on direct conversion quadrature (I/Q) receivers at baseband by analysis or simulation, making use of mathematical models of UWB pulses, of which several examples are given. The unique characteristics of UWB pulses are used to derive predictions of the UWB interference at baseband using both time- and frequency-domain calculations of the baseband filter's response to the pulses. The final result of this analysis is an estimate of the rise in receiver noise level due to the UWB interference.
{"title":"Models for UWB pulses and their effects on narrowband direct conversion receivers","authors":"Leonard E. Miller","doi":"10.1109/UWBST.2003.1267811","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267811","url":null,"abstract":"A methodology is shown for predicting the effect of pulsed UWB communication waveforms on direct conversion quadrature (I/Q) receivers at baseband by analysis or simulation, making use of mathematical models of UWB pulses, of which several examples are given. The unique characteristics of UWB pulses are used to derive predictions of the UWB interference at baseband using both time- and frequency-domain calculations of the baseband filter's response to the pulses. The final result of this analysis is an estimate of the rise in receiver noise level due to the UWB interference.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127789042","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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267810
C.R.C.M. da Silva, Laurence B. Milstein
This paper considers a UWB communication system that uses spectral encoding as both the multiple access scheme and the interference suppression technique. The main advantage of this technology is that the transmitted signal spectrum can be conveniently shaped to suppress narrow-band interference. The implementation of such systems considering real-time devices is examined, and its performance is analyzed in the presence of narrow-band interference. Numerical results of the system performance are presented for a UWB channel model, and for two different multipath combining schemes.
{"title":"Spectral-encoded UWB communication systems","authors":"C.R.C.M. da Silva, Laurence B. Milstein","doi":"10.1109/UWBST.2003.1267810","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267810","url":null,"abstract":"This paper considers a UWB communication system that uses spectral encoding as both the multiple access scheme and the interference suppression technique. The main advantage of this technology is that the transmitted signal spectrum can be conveniently shaped to suppress narrow-band interference. The implementation of such systems considering real-time devices is examined, and its performance is analyzed in the presence of narrow-band interference. Numerical results of the system performance are presented for a UWB channel model, and for two different multipath combining schemes.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124291643","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：