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Proceedings IEEE 56th Vehicular Technology Conference最新文献

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Joint sequential channel estimation and multiuser detection for uplink CDMA over multipath fading 多径衰落下CDMA上行链路联合顺序信道估计和多用户检测
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040543
Qinghua Li, C. Georghiades, Xiaodong Wang
{"title":"Joint sequential channel estimation and multiuser detection for uplink CDMA over multipath fading","authors":"Qinghua Li, C. Georghiades, Xiaodong Wang","doi":"10.1109/VETECF.2002.1040543","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040543","url":null,"abstract":"We consider joint channel estimation and data detection in uplink asynchronous CDMA systems employing aperiodic (long) spreading sequences in the presence of unknown multipath fading. Since maximum-likelihood sequence estimation is too complex to perform, multiuser receivers are proposed based on the sequential expectation-maximization (EM) algorithm. With prior knowledge of only the signature waveforms, the delays and the second-order statistics of the fading channel, the receivers sequentially estimate the channel using the sequential EM algorithm. The snapshot estimates of each path are further tracked by linear minimum-mean-squared-error (MMSE) filters and the user data are detected by a maximum-likelihood sequence detector, given the channel estimates. The proposed receivers that use the exact expressions have a computational complexity O(2/sup K/) per bit, where K is the number of users. Using the traditional EM algorithm, we derive low-complexity approximations which have a complexity of O(K/sup 2/) per bit. Simulation results demonstrate that the proposed receivers offer substantial performance gains over conventional pilot-symbol assisted techniques and achieve a performance close to the known-channel bounds. Furthermore, the proposed receivers even outperform the single-user RAKE receiver with Nyquist pilot-insertion rate in a single-user environment.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"222 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":"115656587","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
On the interference nulling operation of the V-BLAST under channel estimation errors 信道估计误差下V-BLAST的抗干扰操作
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040595
Kyungchun Lee, J. Chun
{"title":"On the interference nulling operation of the V-BLAST under channel estimation errors","authors":"Kyungchun Lee, J. Chun","doi":"10.1109/VETECF.2002.1040595","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040595","url":null,"abstract":"We propose a new interference nulling operation in V-BLAST (Vertical Bell Laboratories Layered Space Time) to reduce unexpected effects by the channel estimation errors. Assuming that the channel estimation is performed by pseudo-inverse of orthogonal or non-orthogonal training sequence matrix, we derive a better nulling vector which minimizes the power of various terms generated by the channel estimation errors. With simulations, we test the performance of the proposed algorithm.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"82 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":"115759512","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
Trellis-coded 8-PSK scheme combined with turbo and single-parity-check product codes 网格编码的8-PSK方案结合turbo和单奇校验产品代码
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040523
S. Nakajima, E. Sato
{"title":"Trellis-coded 8-PSK scheme combined with turbo and single-parity-check product codes","authors":"S. Nakajima, E. Sato","doi":"10.1109/VETECF.2002.1040523","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040523","url":null,"abstract":"We examine a trellis-coded 8-PSK scheme that uses a concatenated code consisting of a rate 2/3, 8-state turbo code (an inner code) and a single-parity-check product code (an outer code). Monte Carlo simulation shows that the concatenated code performs better than turbo code alone. When a turbo interleaver of 4096/spl times/2 bits is used, the Eb/No to obtain a frame-error rate of 10/sup -3/ is about 3.6 dB for the concatenated code, about 3.8 dB for the turbo code alone with an S-random interleaver (S=47), and more than 4.4 dB for the turbo code alone with a random interleaver. In the high signal-to-noise ratios region, a lower bit-error rate is observed with the concatenated code than with the turbo code alone. A concatenated code using a double-iterated decoding system will thus improve the BER and FER of turbo codes.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"270 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":"115816711","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
Space-time iterative multiuser receiver for a coded DS-CDMA system in a flat fading channel 平坦衰落信道下编码DS-CDMA系统的空时迭代多用户接收机
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040321
J. Luna Rivera, D. Cruickshank, J. Thompson
{"title":"Space-time iterative multiuser receiver for a coded DS-CDMA system in a flat fading channel","authors":"J. Luna Rivera, D. Cruickshank, J. Thompson","doi":"10.1109/VETECF.2002.1040321","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040321","url":null,"abstract":"We consider a space-time iterative multiuser (STIM) receiver for a flat fading channel and examine its application in a DS-CDMA mobile communication system with forward error correction (FEC) coding. This multiuser receiver structure exploits its spatial and temporal capabilities to overcome interference. Numerical results shows that a significant increase in capacity over flat fading channels is achieved by combining efficient space-time coding (STC), multiuser detection (MUD), iterative signal processing techniques and the reuse of orthogonal spreading codes.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"35 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":"116990024","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: 1
Delay spread measurements on a wideband MIMO channel at 3.7 GHz 3.7 GHz宽带MIMO信道上的延迟扩展测量
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040671
J. Kepler, T. Krauss, Sandeep Mukthavaram
{"title":"Delay spread measurements on a wideband MIMO channel at 3.7 GHz","authors":"J. Kepler, T. Krauss, Sandeep Mukthavaram","doi":"10.1109/VETECF.2002.1040671","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040671","url":null,"abstract":"This paper summarizes the delay spread characteristics of a 20 MHz MIMO channel at a carrier frequency of 3.676 GHz. The signals are transmitted from a two-antenna base to a two-antenna mobile receiver, and the experiments were conducted in a suburban setting outside Chicago, Illinois. The results include a statistical description of the delay spread environment. In addition, a case study of the temporal behavior of the channel is presented along with a one-bounce analysis to locate macro scatterers.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"61 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":"121102507","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: 43
Performance analysis of OFDM carrier synchronization with diversity 带分集的OFDM载波同步性能分析
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040296
U. Tureli, Rajesh Ambati, D. Kivanç, Hui Liu
{"title":"Performance analysis of OFDM carrier synchronization with diversity","authors":"U. Tureli, Rajesh Ambati, D. Kivanç, Hui Liu","doi":"10.1109/VETECF.2002.1040296","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040296","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) carrier frequency synchronization performance under low SNR can be improved by using diversity. We investigate the improvement in synchronization performance using real data obtained on the Stevens wireless testbed. The experimental setup is comprised of a wideband 65 Msamples/second digital to analog converter, a radio frequency (RF) transmitter which transmits at 2.4 GHz frequency with 12 MHz bandwidth and two RF receiver chains whose outputs are sampled at 65 Msamples/sec. Therefore, the receiver can oversample both in time and in space. The sensitivity of the diversity method to sampling clock errors and calibration errors is discussed.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"48 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":"121126622","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 study of channel estimation in OFDM systems OFDM系统中信道估计的研究
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040729
S. Coleri, M. Ergen, A. Puri, A. Bahai
{"title":"A study of channel estimation in OFDM systems","authors":"S. Coleri, M. Ergen, A. Puri, A. Bahai","doi":"10.1109/VETECF.2002.1040729","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040729","url":null,"abstract":"The channel estimation techniques for OFDM systems based on pilot arrangement are investigated. The channel estimation based on comb type pilot arrangement is studied through different algorithms for both estimating channel at pilot frequencies and interpolating the channel. The estimation of channel at pilot frequencies is based on LS and LMS while the channel interpolation is done using linear interpolation, second order interpolation, low-pass interpolation, spline cubic interpolation, and time domain interpolation. Furthermore, the channel estimation based on block type pilot arrangement is performed by sending pilots at every sub-channel and using this estimation for a specific number of following symbols. We have also implemented a decision feedback equalizer for all sub-channels followed by periodic block-type pilots. We have compared the performances of all schemes by measuring bit error rate with 16QAM, QPSK and DQPSK as modulation schemes, and multipath Rayleigh fading and AR based fading channels as channel models.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"42 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":"125056492","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: 265
MIMO capacities for different antenna array structures based on double directional wide-band channel measurements 基于双向宽带信道测量的不同天线阵列结构的MIMO容量
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040327
D. Hampicke, M. Landmann, Christian, Schneider, G. Sommerkorn, R. Thomä, J. Maurer, W. Wiesbeck
{"title":"MIMO capacities for different antenna array structures based on double directional wide-band channel measurements","authors":"D. Hampicke, M. Landmann, Christian, Schneider, G. Sommerkorn, R. Thomä, J. Maurer, W. Wiesbeck","doi":"10.1109/VETECF.2002.1040327","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040327","url":null,"abstract":"We present an approach for investigating the performance of generic multiple-input multiple-output (MIMO) wireless systems in a realistic way using wideband real-time propagation measurements of the double-directional radio channel. Applying a multidimensional high-resolution channel parameter estimation procedure the descriptive parameters for any relevant propagation path including the path weights, time-delay, Doppler shift and the propagation directions at both ends of the wireless link are extracted simultaneously from the measurement data. from the estimated parameter sets then a local reconstruction of the multidimensional wave fields in the vicinity of the measured aperture volumes in time, space and frequency is possible. Since this way the measurement antenna properties are excluded from the channel, the influence of a variety of application specific array architectures can be investigated. Here, we use this synthesis approach to analyze the performance of given target systems with smart antennas in terms of the resulting channel capacities and eigenvalue distributions.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"22 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":"125275773","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
A new interleaver design and its application to turbo codes 一种新的交织器设计及其在turbo码中的应用
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040453
Yan-Xiu Zheng, Y. Su
{"title":"A new interleaver design and its application to turbo codes","authors":"Yan-Xiu Zheng, Y. Su","doi":"10.1109/VETECF.2002.1040453","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040453","url":null,"abstract":"We present a general interleaver structure that can be systematically derived from any existing block interleaver. When used in a turbo code with proper encoding and decoding procedures, the proposed interleaver is capable of providing unbounded interleaving depth with bounded decoding delay. Given a fixed decoding delay, the new interleaver results in superior bit error rate (BER) performance. The algebraic properties of the associated turbo codes are examined to provide guidelines in design the permutation rule.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"49 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":"125590014","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: 8
Performance of hard and soft handover for CDMA system CDMA系统的硬切换和软切换性能
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040783
Duo Zhang, Guo Wei, Jinkang Zhu
{"title":"Performance of hard and soft handover for CDMA system","authors":"Duo Zhang, Guo Wei, Jinkang Zhu","doi":"10.1109/VETECF.2002.1040783","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040783","url":null,"abstract":"Based on a handover (HO) model and two basic HO algorithms in the CDMA system, this paper proposes expressions of the outage probability and mean active set number (MASN) for hard HO (HHO) and soft HO (SHO). By simulations in the WCDMA (FDD) system, the lower and upper bound of HHO and SHO are presented, and their performance difference at various HO thresholds are compared. Moreover, this paper concludes the simulation results are significant to both the tradeoff between quality of service (QoS) and system resource efficiency (SRE) and the optimal deployment of HO.","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":"126762766","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: 19
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