Pub Date : 2005-07-04DOI: 10.1109/NETUWB.2005.1470005
L. Kuzmin, V. A. Morozov, S. Starkov
Possible methods for receiving ultra wideband chaotic signals are considered in case of multipath indoor propagation (line-of-sight channel model). The quality of receiving is estimated taking into account the total influence of the multitude of delayed beams as virtual noise. It is shown that the proposed approaches treated in the BER /spl sim/10/sup -3/.
{"title":"Receiving ultrawideband chaotic signals in indoor multipath environment","authors":"L. Kuzmin, V. A. Morozov, S. Starkov","doi":"10.1109/NETUWB.2005.1470005","DOIUrl":"https://doi.org/10.1109/NETUWB.2005.1470005","url":null,"abstract":"Possible methods for receiving ultra wideband chaotic signals are considered in case of multipath indoor propagation (line-of-sight channel model). The quality of receiving is estimated taking into account the total influence of the multitude of delayed beams as virtual noise. It is shown that the proposed approaches treated in the BER /spl sim/10/sup -3/.","PeriodicalId":106176,"journal":{"name":"2nd International Workshop Networking with Ultra Wide Band and Workshop on Ultra Wide Band for Sensor Networks, 2005. Networking with UWB 2005.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120904256","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 : 2005-07-04DOI: 10.1109/NETUWB.2005.1470000
M. Biagi, C. Pelizzoni, N. Cordeschi, E. Baccarelli
In this contribution we analyze the effect of multi-user interference in terms of user collision probability and collision probability at all, by showing the impact that different system parameters have on the collision probability and the effect that this last presents on codeword error probability both in forward error correcting (FEC) and automatic repeat request (ARQ) schemes.
{"title":"Performance analysis of impulse-radio UWB networks impaired by multiple access interference","authors":"M. Biagi, C. Pelizzoni, N. Cordeschi, E. Baccarelli","doi":"10.1109/NETUWB.2005.1470000","DOIUrl":"https://doi.org/10.1109/NETUWB.2005.1470000","url":null,"abstract":"In this contribution we analyze the effect of multi-user interference in terms of user collision probability and collision probability at all, by showing the impact that different system parameters have on the collision probability and the effect that this last presents on codeword error probability both in forward error correcting (FEC) and automatic repeat request (ARQ) schemes.","PeriodicalId":106176,"journal":{"name":"2nd International Workshop Networking with Ultra Wide Band and Workshop on Ultra Wide Band for Sensor Networks, 2005. Networking with UWB 2005.","volume":"76 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121817215","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 : 2005-07-04DOI: 10.1109/NETUWB.2005.1470002
F. Granelli, Honggang Zhang
The paper introduces the concept of cognitive UWB radio, a wireless system based on UWB transmission able to self-adapt to the characteristics of the surrounding environment. First, salient features of UWB transmission are reviewed, and then, application of UWB characteristics to the problem of cognitive radio systems is discussed. Some preliminary studies on the physical level underline the potential value of the proposed framework.
{"title":"Cognitive ultra wide band radio: a research vision and its open challenges","authors":"F. Granelli, Honggang Zhang","doi":"10.1109/NETUWB.2005.1470002","DOIUrl":"https://doi.org/10.1109/NETUWB.2005.1470002","url":null,"abstract":"The paper introduces the concept of cognitive UWB radio, a wireless system based on UWB transmission able to self-adapt to the characteristics of the surrounding environment. First, salient features of UWB transmission are reviewed, and then, application of UWB characteristics to the problem of cognitive radio systems is discussed. Some preliminary studies on the physical level underline the potential value of the proposed framework.","PeriodicalId":106176,"journal":{"name":"2nd International Workshop Networking with Ultra Wide Band and Workshop on Ultra Wide Band for Sensor Networks, 2005. Networking with UWB 2005.","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134102810","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 : 2005-07-04DOI: 10.1109/NETUWB.2005.1469995
A. Di Francesco, M. Di Renzo, R. Minutolo
This paper reports on extensive experimental activities and related modelling for the characterization of the ultra-wide bandwidth (UWB) channel in a typical "sub-urban" environment. We first present the experimental setup and describe the methodology-used for channel sounding. Then, statistical models are presented, as derived after post-processing of collected and "cleaned" samples. The main achievements can be summarized as follows: i) the path-loss exponent varies from 2.5 to 3.5 and depends on the height from the ground floor of transmission and reception equipments, ii) the statistics of the first received echo in the small-scale analysis can be modelled through a log normal or a gamma distribution; and iii) the delay spread in the small-scale multipath scenario ranges from 7 ns to 32 ns.
{"title":"Sounding and modelling of the ultra wide-band channel in outdoor scenarios","authors":"A. Di Francesco, M. Di Renzo, R. Minutolo","doi":"10.1109/NETUWB.2005.1469995","DOIUrl":"https://doi.org/10.1109/NETUWB.2005.1469995","url":null,"abstract":"This paper reports on extensive experimental activities and related modelling for the characterization of the ultra-wide bandwidth (UWB) channel in a typical \"sub-urban\" environment. We first present the experimental setup and describe the methodology-used for channel sounding. Then, statistical models are presented, as derived after post-processing of collected and \"cleaned\" samples. The main achievements can be summarized as follows: i) the path-loss exponent varies from 2.5 to 3.5 and depends on the height from the ground floor of transmission and reception equipments, ii) the statistics of the first received echo in the small-scale analysis can be modelled through a log normal or a gamma distribution; and iii) the delay spread in the small-scale multipath scenario ranges from 7 ns to 32 ns.","PeriodicalId":106176,"journal":{"name":"2nd International Workshop Networking with Ultra Wide Band and Workshop on Ultra Wide Band for Sensor Networks, 2005. Networking with UWB 2005.","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121076132","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 : 2005-07-04DOI: 10.1109/NETUWB.2005.1470001
M. Di Benedetto, G. Giancola, D. Domenicali, P. Ingargiola
Time hopping ultra wide band (TH-UWB) commonly encodes the data symbols by shifting the position of the transmitted pulses by a quantity that is quantized over the inter-pulse interval range. In this paper, we relax the hypothesis of a discrete value for the time shift introduced by the TH code, by considering the possibility of generating real-valued codes that introduce time hopping in a "fluid" way. The effect on the power spectral density of generated signals is analyzed, and potential application of fluid coding to multiple access and to network coexistence are discussed, with the awareness of the consequent increased complexity of the receiver.
{"title":"Fluid coding in time hopping ultra wide band networks","authors":"M. Di Benedetto, G. Giancola, D. Domenicali, P. Ingargiola","doi":"10.1109/NETUWB.2005.1470001","DOIUrl":"https://doi.org/10.1109/NETUWB.2005.1470001","url":null,"abstract":"Time hopping ultra wide band (TH-UWB) commonly encodes the data symbols by shifting the position of the transmitted pulses by a quantity that is quantized over the inter-pulse interval range. In this paper, we relax the hypothesis of a discrete value for the time shift introduced by the TH code, by considering the possibility of generating real-valued codes that introduce time hopping in a \"fluid\" way. The effect on the power spectral density of generated signals is analyzed, and potential application of fluid coding to multiple access and to network coexistence are discussed, with the awareness of the consequent increased complexity of the receiver.","PeriodicalId":106176,"journal":{"name":"2nd International Workshop Networking with Ultra Wide Band and Workshop on Ultra Wide Band for Sensor Networks, 2005. Networking with UWB 2005.","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115472236","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 : 2005-07-04DOI: 10.1109/NETUWB.2005.1469997
T. Erseghe, N. Laurenti
One of the most attractive features of time-hopping UWB transmission, largely ignored in the literature so far, is the possibility to operate in full-duplex mode, thanks to its very low duty-cycle. This allows a terminal to transmit and receive within the same time frame and frequency band, yielding a considerable saving of time and band resources at the radio-resource-management layer. In this paper, we propose a methodology to design channel estimation/synchronization and demodulation/decoding algorithms for a receiver operating in full-duplex mode. The leading idea is simply to avoid, at reception, time intervals that correspond to pulse transmission. We also evaluate the performances of such a system through simulations. From our results, the full-duplex system shows its feasibility for quite a wide range of transmission activity rates.
{"title":"Time hopping UWB: receiver design and performance of a full-duplex system","authors":"T. Erseghe, N. Laurenti","doi":"10.1109/NETUWB.2005.1469997","DOIUrl":"https://doi.org/10.1109/NETUWB.2005.1469997","url":null,"abstract":"One of the most attractive features of time-hopping UWB transmission, largely ignored in the literature so far, is the possibility to operate in full-duplex mode, thanks to its very low duty-cycle. This allows a terminal to transmit and receive within the same time frame and frequency band, yielding a considerable saving of time and band resources at the radio-resource-management layer. In this paper, we propose a methodology to design channel estimation/synchronization and demodulation/decoding algorithms for a receiver operating in full-duplex mode. The leading idea is simply to avoid, at reception, time intervals that correspond to pulse transmission. We also evaluate the performances of such a system through simulations. From our results, the full-duplex system shows its feasibility for quite a wide range of transmission activity rates.","PeriodicalId":106176,"journal":{"name":"2nd International Workshop Networking with Ultra Wide Band and Workshop on Ultra Wide Band for Sensor Networks, 2005. Networking with UWB 2005.","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116071337","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 : 2005-07-04DOI: 10.1109/NETUWB.2005.1469996
A. Dmitriev, A. Panas, S. Starkov
The concept of ultra wide band (UWB) direct chaotic communication (DCC) is proposed. Main features, and the performances of proposed scheme are discussed. Theoretical aspects and some performances of proposed technology are considered. The experimental models of the system are described and some experimental results, demonstrating the wireless transmission with the data rates up to 500 M bps are carried out.
{"title":"Ultra-wide band communications using chaos","authors":"A. Dmitriev, A. Panas, S. Starkov","doi":"10.1109/NETUWB.2005.1469996","DOIUrl":"https://doi.org/10.1109/NETUWB.2005.1469996","url":null,"abstract":"The concept of ultra wide band (UWB) direct chaotic communication (DCC) is proposed. Main features, and the performances of proposed scheme are discussed. Theoretical aspects and some performances of proposed technology are considered. The experimental models of the system are described and some experimental results, demonstrating the wireless transmission with the data rates up to 500 M bps are carried out.","PeriodicalId":106176,"journal":{"name":"2nd International Workshop Networking with Ultra Wide Band and Workshop on Ultra Wide Band for Sensor Networks, 2005. Networking with UWB 2005.","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131938582","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 : 2005-07-04DOI: 10.1109/NETUWB.2005.1470004
R. Cardinali, L. D. De Nardis, P. Lombardo, M. Di Benedetto
The definition of ultra wide band (UWB) signals released by the Federal Communications Commissions (FCC) opened the way to both impulse and non-impulse UWB signal formats, as reflected within the IEEE 802.15.3a TG, devoted to the definition of a standard for UWB-based high bit rate WPANs. The two main proposals considered in this group are a multi band OFDM approach, based on the transmission of non-impulse OFDM signals combined with frequency hopping (FH), and the direct-sequence (DS) UWB approach, based on impulse radio transmission of UWB DS-coded pulses. In this paper, the ranging capabilities of the two proposals are investigated by determining the Cramer-Rao lower bound (CRLB) for the distance estimation error. The CRLB is evaluated with both ideal and real, multipath-affected, channel models and the impact of multipath on ranging accuracy is quantified. Results show that DS-UWB is, in general, best suited for ranging, thanks to its larger bandwidth and its higher frequencies of operation, although multipath may affect in a different way DS-UWB and MB-OFDM signals.
{"title":"UWB ranging accuracy for applications within IEEE 802.15.3a","authors":"R. Cardinali, L. D. De Nardis, P. Lombardo, M. Di Benedetto","doi":"10.1109/NETUWB.2005.1470004","DOIUrl":"https://doi.org/10.1109/NETUWB.2005.1470004","url":null,"abstract":"The definition of ultra wide band (UWB) signals released by the Federal Communications Commissions (FCC) opened the way to both impulse and non-impulse UWB signal formats, as reflected within the IEEE 802.15.3a TG, devoted to the definition of a standard for UWB-based high bit rate WPANs. The two main proposals considered in this group are a multi band OFDM approach, based on the transmission of non-impulse OFDM signals combined with frequency hopping (FH), and the direct-sequence (DS) UWB approach, based on impulse radio transmission of UWB DS-coded pulses. In this paper, the ranging capabilities of the two proposals are investigated by determining the Cramer-Rao lower bound (CRLB) for the distance estimation error. The CRLB is evaluated with both ideal and real, multipath-affected, channel models and the impact of multipath on ranging accuracy is quantified. Results show that DS-UWB is, in general, best suited for ranging, thanks to its larger bandwidth and its higher frequencies of operation, although multipath may affect in a different way DS-UWB and MB-OFDM signals.","PeriodicalId":106176,"journal":{"name":"2nd International Workshop Networking with Ultra Wide Band and Workshop on Ultra Wide Band for Sensor Networks, 2005. Networking with UWB 2005.","volume":"67 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123522873","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 : 2005-07-04DOI: 10.1109/NETUWB.2005.1470003
Y. Dhibi, T. Kaiser
In this contribution we investigate the robustness of mixed impulse radio and UWB-OFDM systems under impulsive noise being typical in UWB multiuser environments. We propose a new receiver structure suppressing iteratively the impulsive noise without use of an adaptive clipper. Hence, the delicate problem of tracking a (sub)optimal threshold is avoided. The performance of this structure in comparison with a conventional UWB-OFDM receiver is illustrated.
{"title":"Iterative impulsive noise suppression in mixed impulse radio and UWB-OFDM systems","authors":"Y. Dhibi, T. Kaiser","doi":"10.1109/NETUWB.2005.1470003","DOIUrl":"https://doi.org/10.1109/NETUWB.2005.1470003","url":null,"abstract":"In this contribution we investigate the robustness of mixed impulse radio and UWB-OFDM systems under impulsive noise being typical in UWB multiuser environments. We propose a new receiver structure suppressing iteratively the impulsive noise without use of an adaptive clipper. Hence, the delicate problem of tracking a (sub)optimal threshold is avoided. The performance of this structure in comparison with a conventional UWB-OFDM receiver is illustrated.","PeriodicalId":106176,"journal":{"name":"2nd International Workshop Networking with Ultra Wide Band and Workshop on Ultra Wide Band for Sensor Networks, 2005. Networking with UWB 2005.","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116068562","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 : 2005-07-04DOI: 10.1109/NETUWB.2005.1469999
E. Medina, M. Nájar
Ultra wideband (UWB) communications systems provide high accuracy positioning estimation because the high multipath resolution capacity. This paper deals with the normalized minimum variance (NMV) technique for estimating time of arrival (TOA) exploiting the pulse train defined in the Impulse Radio (IR) transmission. Positioning estimation is tackled with the extended Kalman filter (EKF) with TOA bias tracking allowing high accuracy even in non line of sight (NLOS) scenarios.
{"title":"High resolution location in ultra wideband communications systems","authors":"E. Medina, M. Nájar","doi":"10.1109/NETUWB.2005.1469999","DOIUrl":"https://doi.org/10.1109/NETUWB.2005.1469999","url":null,"abstract":"Ultra wideband (UWB) communications systems provide high accuracy positioning estimation because the high multipath resolution capacity. This paper deals with the normalized minimum variance (NMV) technique for estimating time of arrival (TOA) exploiting the pulse train defined in the Impulse Radio (IR) transmission. Positioning estimation is tackled with the extended Kalman filter (EKF) with TOA bias tracking allowing high accuracy even in non line of sight (NLOS) scenarios.","PeriodicalId":106176,"journal":{"name":"2nd International Workshop Networking with Ultra Wide Band and Workshop on Ultra Wide Band for Sensor Networks, 2005. Networking with UWB 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130154176","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：