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Proceedings IEEE 56th Vehicular Technology Conference最新文献

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Statistical theory of the effects of radio location system design parameters on the positioning performance 无线电定位系统设计参数对定位性能影响的统计理论
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040792
C. Botteron, M. Fattouche, A. Høst-Madsen
{"title":"Statistical theory of the effects of radio location system design parameters on the positioning performance","authors":"C. Botteron, M. Fattouche, A. Høst-Madsen","doi":"10.1109/VETECF.2002.1040792","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040792","url":null,"abstract":"This paper provides an asymptotic performance evaluation of network based or multilateral radio location estimators that use the time of arrival (TOA) and/or the angle of arrival (AOA) measurements of the signals travelling from a mobile station (MS) to a set of fixed stations (FSs) to estimate the MS's position. The analysis is based on the Cramer-Rao lower bound (CRLB) and the maximum likelihood theory, and takes into account the effects of the system design parameters as well as the effects of biased measurements, which can result for example from hardware calibration errors or multipath effects, including the lack of line of sight. Explicit formulas that provide a clear relationship between the various system design parameters and the positioning accuracy are derived and discussed. Finally, the theory is verified with numerical simulations.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131459396","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
The impact of nonlinear devices on the symbol error rate in broadband OFDM transmission 非线性器件对宽带OFDM传输中码元误码率的影响
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040693
G. Wunder, H. Boche
{"title":"The impact of nonlinear devices on the symbol error rate in broadband OFDM transmission","authors":"G. Wunder, H. Boche","doi":"10.1109/VETECF.2002.1040693","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040693","url":null,"abstract":"In this paper the impact of nonlinear devices on the symbol error rate (SER) in OFDM transmission is investigated. It is shown that conventional analysis (Gaussian distribution of the distortion terms) fails to give accurate results in the lower probability region. A new approach is presented providing real upper bounds on the assumption that the OFDM signal can be modeled as a stationary Gaussian random process.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132481619","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: 4
The impact of multiuser diversity on space-time block coding 多用户分集对空时分组编码的影响
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040377
R. Gozali, R. Buehrer, B. Woerner
{"title":"The impact of multiuser diversity on space-time block coding","authors":"R. Gozali, R. Buehrer, B. Woerner","doi":"10.1109/VETECF.2002.1040377","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040377","url":null,"abstract":"We consider a scenario in which K active data users, each of which is equipped with multiple antenna elements, are served by a multi-antenna element base station (BS). We focus on the downlink channel, where space-time block coding scheme is employed and assume that channel state information (CSI) is reported to the BS by all users and on a per frame basis. Using a scoring function at the BS, time resources are allocated to the user with the best instantaneous effective SNR, facilitating a multiuser diversity mechanism. Using order statistics, we compute histograms and cumulative distribution functions of the effective SNR at the space-time combiner output and assess on the interactions between multiuser diversity and spatial diversity.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"172 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134526762","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: 2
Performance evaluation of channel estimation techniques for a mobile fourth generation wide area OFDM system 移动第四代广域OFDM系统信道估计技术的性能评价
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040576
A. Dowler, A. Doufexi, A. Nix
{"title":"Performance evaluation of channel estimation techniques for a mobile fourth generation wide area OFDM system","authors":"A. Dowler, A. Doufexi, A. Nix","doi":"10.1109/VETECF.2002.1040576","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040576","url":null,"abstract":"In this paper channel estimation techniques for a mobile fourth generation coherent orthogonal frequency division multiplexing (OFDM) system are proposed. Coherent detection dictates that a per-subband estimate of the frequency response of the channel is generated for each OFDM symbol. This is achieved by inserting pilot symbols amongst the data symbols in the OFDM modulation grid. With suitable interpolation, the channel estimate at all intermediate symbols can be generated. A number of channel estimation methods with different pilot patterns and interpolation methods are examined for a range of UTRA specified channel environments. Each environment is shown to have an optimal pilot scheme, power level, pattern and density and the paper proposes the use of adaptive pilot processing.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133965411","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: 81
Impact of closed-loop power control on SDMA/TDMA system performance 闭环功率控制对SDMA/TDMA系统性能的影响
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040532
Yunjian Jia, S. Hara, Y. Hara
{"title":"Impact of closed-loop power control on SDMA/TDMA system performance","authors":"Yunjian Jia, S. Hara, Y. Hara","doi":"10.1109/VETECF.2002.1040532","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040532","url":null,"abstract":"Power control is an important system requirement in SDMA (space division multiple access) to compensate for inequality of signal quality among near-end and far-end terminals. This paper presents a closed-loop power control scheme in an SDMA system to achieve the optimal power allocation and beam pattern for both uplink and downlink in the entire network. The performance of the proposed scheme is evaluated by computer simulation in terms of blocking rate and forced termination rate of a TDD-SDMA/TDMA system in a multi-cell wireless system, and it is also compared with an open-loop power control scheme. The numerical results show that the system with the closed-loop power control has significantly better performance than that with the open-loop power control. Our investigation indicates the closed-loop power control scheme has a large impact on SDMA/TDMA system performance, where the remarkable improvement in system capacity can be achieved.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"877 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134281048","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: 4
Correlative-encoded (CE) FSK for use in RF home networking 用于射频家庭网络的相关编码(CE) FSK
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040651
Kee-Hoon Lee, Youngjin Lee, Byeong-Woo Choi, Jongsoo Seo
{"title":"Correlative-encoded (CE) FSK for use in RF home networking","authors":"Kee-Hoon Lee, Youngjin Lee, Byeong-Woo Choi, Jongsoo Seo","doi":"10.1109/VETECF.2002.1040651","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040651","url":null,"abstract":"A new power and bandwidth efficient modem technique, correlative encoded FSK (CEFSK), is proposed for use in RF home networking system. Power spectral densities (PSD) and BER performance of CEFSK are analyzed and compared with those of GFSK via computer simulation. A new fractional multi-bit differential detection (FMDD) technique is also proposed in order to improve the BER performance of CEFSK. Our simulation results show that CEFSK has a spectral efficiency comparable to GFSK, and that BER performance of CEFSK using 5-branch FMDD technique outperforms that of GFSK by 2.0 dB at a BER=1 /spl times/ 10/sup -4/ in AWGN and multipath fading channels.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132617000","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: 0
Simplified polarization assignment method for terminals in SDMA adopting directivity and polarization control 采用指向性和极化控制的SDMA终端极化分配简化方法
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040462
K. Nishimori, K. Komiya, K. Cho, H. Mizuno
{"title":"Simplified polarization assignment method for terminals in SDMA adopting directivity and polarization control","authors":"K. Nishimori, K. Komiya, K. Cho, H. Mizuno","doi":"10.1109/VETECF.2002.1040462","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040462","url":null,"abstract":"This paper proposes a simplified polarization assignment method for the space division multiple access (SDMA) terminal station that adopts directivity and polarization control by using the spatial correlation and the difference in the spatial correlation. Since the difference in the channel responses among all users is considered in the proposed method, an effective assignment of the polarization for the terminal stations is achieved even if the number of the users is large in SDMA systems. Moreover, we evaluate the effectiveness of the proposed polarization assignment method by computer simulation using the measured data in a cellular environment.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129371427","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: 0
A new dual-band antenna for ISM application 一种用于ISM应用的新型双频天线
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040738
Duixian Liu, B. Gaucher, E. Flint
{"title":"A new dual-band antenna for ISM application","authors":"Duixian Liu, B. Gaucher, E. Flint","doi":"10.1109/VETECF.2002.1040738","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040738","url":null,"abstract":"This paper presents dual-band antenna structures for portable applications. The antenna can be stamped from sheet metal or manufactured on a single-sided PCB. No additional impedance matching is necessary. The antenna structure is simple, but it has high efficiency and reasonable SWR bandwidth.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128936164","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: 15
QoS-ASR: an adaptive source routing protocol with QoS support in multihop mobile wireless networks QoS- asr:在多跳移动无线网络中支持QoS的自适应源路由协议
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040564
H. Labiod, A. Quidelleur
{"title":"QoS-ASR: an adaptive source routing protocol with QoS support in multihop mobile wireless networks","authors":"H. Labiod, A. Quidelleur","doi":"10.1109/VETECF.2002.1040564","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040564","url":null,"abstract":"We focus on one critical issue in mobile ad hoc networks (MANETs) that is quality-of-service (QoS) routing. MANETs are formed by an autonomous collection of mobile nodes constructing dynamic networks and communicating over wireless links. In this context, we propose a novel routing protocol named QoS adaptive source routing protocol (QoS-ASR). It is an adaptive soft-QoS protocol with aggregate flows. It applies the source routing mechanism defined by the dynamic source routing (DSR) unicast protocol to avoid channel overhead and to improve scalability. QoS-ASR handles QoS criteria taking into account application requirements (link transmission delay, available bandwidth, packet loss rate) combined with network state related constraints (battery life, link stability, node congestion state). The performance of the proposed scheme is evaluated via simulations and is compared to DSR.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131035955","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: 20
Effect of multicode interference on the downlink capacity of a UMTS TDD CDMA cellular system 多码干扰对UMTS TDD CDMA蜂窝系统下行容量的影响
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040617
Marc-Antoine Parent, B. Smida, V. Sampath, J. Regnier
{"title":"Effect of multicode interference on the downlink capacity of a UMTS TDD CDMA cellular system","authors":"Marc-Antoine Parent, B. Smida, V. Sampath, J. Regnier","doi":"10.1109/VETECF.2002.1040617","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040617","url":null,"abstract":"The impact of multicode transmission on the capacity of a UMTS TDD CDMA system is investigated. The interference incurred by using such a transmission technique is often overlooked, resulting in optimistic performance evaluations. The multicode interference contribution is expressed in closed-form. This multicode contribution can be integrated to existing capacity studies without great restructuring needs. The performance degradation is assessed by using a multi-cell multi-service system-level simulation tool that evaluates the capacity of the system with and without multicode interference. The simulation tool parameters are based on principles and assumptions of 3GPP. The main results of this study show that a network with high-rate users in a vehicular environment can suffer from a substantial performance degradation due to multicode transmission, especially if the orthogonality between channelization codes cannot be maintained.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132987551","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: 0
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