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IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.最新文献

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An adaptive dual-rate random access scheme 一种自适应双速率随机接入方案
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506243
Ruifeng Bang, Lei Zhou, Yu-dong Yao
{"title":"An adaptive dual-rate random access scheme","authors":"Ruifeng Bang, Lei Zhou, Yu-dong Yao","doi":"10.1109/SPAWC.2005.1506243","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506243","url":null,"abstract":"We propose a random access scheme with reduced rate retransmissions. The scheme is based on the standard slotted Aloha protocol; but if a collision happens, the colliding and thus corrupted packets is shrinked in size for retransmissions. The size shrinking can be achieved using the widely available multirate scalable source coding techniques. The channel slot splits into minislots and the shrinked packets are transmitted at one randomly chosen minislot. This dual-rate scheme allows significantly higher packet throughput while keeping a decent bit throughput, which is proved both analytically and numerically in this paper.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127212670","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
Low complexity full diversity full rate code for closed loop MIMO 低复杂度全分集全速率闭环MIMO代码
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506199
P. Ding, D. Love, J. Wang, M. Zoltowski
{"title":"Low complexity full diversity full rate code for closed loop MIMO","authors":"P. Ding, D. Love, J. Wang, M. Zoltowski","doi":"10.1109/SPAWC.2005.1506199","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506199","url":null,"abstract":"Full diversity full rate (FDFR) space-time coding for open loop multiple antenna systems is attractive because of high data rate and good performance, but its decoding is computationally intensive. In this paper, we propose a low complexity adaptive FDFR code for closed loop multiple input multiple output (MIMO) systems. We show that with only channel singular vector knowledge at the transmitter, the open loop FDFR code can be adapted to the channel while maintaining the special layer structure of the code at the receiver. That special layer structure enables us to decouple the joint detection into optimal, but separate, decoding of each of the different layers which reduces the complexity exponent. The proposed low complexity adaptive scheme maintains the full diversity order. To fully exploit channel knowledge and improve the performance, adaptive power loading is also incorporated with the information of the singular values of the channel. The optimal loading scheme is derived from the upper bound of the symbol vector error rate, and the loading coefficients can be seen as match filtering to the singular values of the channel. The proposed scheme can also be implemented by spatial multiplexing with adaptive linear precoding.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"2007 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127306908","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
PLM-based channelization sequences for multi-code wideband DS-CDMA 基于plm的多码宽带DS-CDMA信道化序列
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1505871
M. Khanfouci, S. Marcos
{"title":"PLM-based channelization sequences for multi-code wideband DS-CDMA","authors":"M. Khanfouci, S. Marcos","doi":"10.1109/SPAWC.2005.1505871","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1505871","url":null,"abstract":"A key problem in multi-code DS-CDMA communication systems is the limited resource in the code domain, i.e. limited number of available orthogonal channelization sequences. This problem causes the overall interference to be a limiting factor, especially when high symbol rate signaling is considered. In order to resolve this problem the literature has proposed many code management techniques, based essentially on code sharing mechanisms among the active users in the system. In this paper we propose a simpler method for the performance optimization of the multi-code DS-CDMA communication systems, based on the design of the channelization sequences used in the system. The optimal channelization sequences are implemented by means of chaotic piece wise linear Markov (PLM) sequences.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"10 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133003785","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
MIMO doubly-iterative equalization for dual polarized systems 双极化系统的MIMO双迭代均衡
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506078
M. Koca, B. Levy
{"title":"MIMO doubly-iterative equalization for dual polarized systems","authors":"M. Koca, B. Levy","doi":"10.1109/SPAWC.2005.1506078","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506078","url":null,"abstract":"We examine the minimum mean-square error (MMSE) turbo equalization of turbo-coded and dual-polarized broadband wireless signals for frequency selective channels. Severe multipath dispersion, represented by a long channel impulse response between each polarization state and receive sensor, makes impossible the direct application of trellis-based turbo equalizers. For this reason, we propose a computationally efficient turbo receiver that employs a soft-information aided MMSE space-time equalizer at its front-end for each polarization direction, because the dual-polarization modulator takes the outputs of a turbo encoder, the space-time MMSE equalizer is coupled with a turbo decoder at its back-end. Therefore the proposed receiver performs a doubly-iterative operation: an outer equalization iteration for each polarization signal and an inner decoding iteration within each outer loop.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132267805","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
On the channel correlation structure of wideband scale-lag Rake fingers 宽带尺度滞后Rake指的信道相关结构研究
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506053
A. Margetts, Philip Schniter
{"title":"On the channel correlation structure of wideband scale-lag Rake fingers","authors":"A. Margetts, Philip Schniter","doi":"10.1109/SPAWC.2005.1506053","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506053","url":null,"abstract":"The scale-lag Rake receiver is designed for wideband systems employing direct-sequence spread spectrum with a large bandwidth-to-center frequency ratio, such that the typical narrowband Doppler spread assumptions do not apply to mobile channels, and is capable of exploiting the diversity that results from mobility. We derive autocorrelation expressions for scale-lag Rake channel coefficients and explore the effectiveness of principal components combining (PCC) to reduce receiver complexity while maintaining performance. Such analysis applies, for example, to ultra-wideband (UWB) radio frequency channels and underwater wideband acoustic channels.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126744159","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
Generalized consensus computation in networked systems with erasure links 具有擦除链路的网络系统中的广义一致性计算
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506308
M. Rabbat, Robert D. Nowak, J. Bucklew
{"title":"Generalized consensus computation in networked systems with erasure links","authors":"M. Rabbat, Robert D. Nowak, J. Bucklew","doi":"10.1109/SPAWC.2005.1506308","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506308","url":null,"abstract":"We study consensus problems in networked systems with unreliable links. Our contributions are two-fold. First, we derive a family of decentralized consensus algorithms for minimizing a sum of convex functions, /spl Sigma//sub i=1//sup N/f/sub i/(x), where each function f/sub i/ only depends on information at one node in the network. Computing the consensus average is a special case in this setting. Then, we construct a modified algorithm which is resilient in situations where the channels between nodes act as binary erasure channels. The flexibility and efficacy of our approach is demonstrated through an application of robust estimation.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126849556","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: 113
Block DFE and windowing for Doppler-affected OFDM systems 多普勒影响OFDM系统的块DFE和窗口
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506069
L. Rugini, P. Banelli, G. Leus
{"title":"Block DFE and windowing for Doppler-affected OFDM systems","authors":"L. Rugini, P. Banelli, G. Leus","doi":"10.1109/SPAWC.2005.1506069","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506069","url":null,"abstract":"Recently, a minimum mean-squared error (MMSE) block linear equalizer based on a band LDL/sup H/ factorization has been proposed for equalization of orthogonal frequency-division multiplexing (OFDM) systems affected by Doppler spread. In this paper, we extend this approach towards two directions. First, we design an MMSE block decision-feedback equalizer (DFE) based on the band LDL/sup H/ factorization. Both performance and complexity are analyzed. Second, we enhance the performance of the linear equalizer by means of receiver windows tailored to the band LDL/sup H/ factorization approach. Simulation results show that the proposed techniques are effective in reducing the error floor caused by the intercarrier interference (ICI).","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"147 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122271274","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: 25
Accurate indoor residential PLC model suitable for channel and EMC estimation 精确的室内住宅PLC模型，适用于信道和EMC估计
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506287
T. Banwell
{"title":"Accurate indoor residential PLC model suitable for channel and EMC estimation","authors":"T. Banwell","doi":"10.1109/SPAWC.2005.1506287","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506287","url":null,"abstract":"An accurate power line cable model is presented along with a higher level companion model which separates common-mode and pair mode-propagation in realistic residential power line network topologies. We describe physical models for common 14/2-10/2; and 14/3-8/3 cables with ground that include all propagating modes: differential-mode(s), pair-mode, and common-mode to \"earth\". The basic cable model is suitable for computing channel response and common mode currents in simple topologies using matrix or SPICE circuit simulation. The higher level companion model incorporates ground bonding at the service panel and readily facilitates analysis of complex network topologies using transmission-matrix methods. Signal flow methods are demonstrated for parameter extraction and assessing dominant paths relevant to both channel characterization and electromagnetic compatibility.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114210277","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
Rate two full-diversity space-frequency code design for MIMO-OFDM MIMO-OFDM的速率二全分集空频码设计
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506036
Wei Zhang, X. Xia, P. Ching, Haiquan Wang
{"title":"Rate two full-diversity space-frequency code design for MIMO-OFDM","authors":"Wei Zhang, X. Xia, P. Ching, Haiquan Wang","doi":"10.1109/SPAWC.2005.1506036","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506036","url":null,"abstract":"In this paper we propose a high-rate full-diversity space-frequency code (SFC) for MIMO-OFDM system over multipath fading channels. The proposed SFC can achieve full-diversity with a transmission rate up to 2 symbols per channel use (pen) for two transmit antennas. The theoretical claims are confirmed by simulations and the performance compared with existing SFC.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125615134","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
Decentralized detection of stochastic signals in power-constrained sensor networks 功率受限传感器网络中随机信号的分散检测
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1505914
S. Jayaweera
{"title":"Decentralized detection of stochastic signals in power-constrained sensor networks","authors":"S. Jayaweera","doi":"10.1109/SPAWC.2005.1505914","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1505914","url":null,"abstract":"Decentralized detection of a stochastic signal in a total average power constrained wireless sensor network is considered. Assuming amplify-and-relay local processing, the fusion performance is derived in closed-form under both Bayesian and Neyman-Pearson optimality, in the case of conditionally independent signal samples. An important observation is that the average fusion probability of error does not improve monotonically with the number of sensors unlike in the case of deterministic signal detection reported in Chamberland, J et al., (2004). In particular, there is an optimal number of sensors that minimizes the probability of error, which depends on both observation signal-to-noise ratio (SNR) as well channel SNR.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122630755","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: 11
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