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2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)最新文献

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Space-time block code design for communication in spread systems 面向扩展系统通信的空时分组码设计
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671079
M. Beko, R. Dinis
{"title":"Space-time block code design for communication in spread systems","authors":"M. Beko, R. Dinis","doi":"10.1109/SPAWC.2010.5671079","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671079","url":null,"abstract":"The problem of designing space-time signal constellations for communication in spread multiple-antenna wireless systems over Rayleigh fading channel is examined. Using the asymptotic union bound on codeword error probability as design criterion, codes based on general complex-valued symbols are obtained with a gradient search optimization technique. New space-time constellations for some particular wireless scenarios are constructed and their performance is assessed. Computer simulations illustrate that significant improvement over state-of-art schemes can be obtained.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130986536","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
Optimization of mutual information of AF-DSTBCs over the random set relay channel 随机中继信道上af - dstbc互信息优化
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671269
Qiang Xue, G. Abreu
{"title":"Optimization of mutual information of AF-DSTBCs over the random set relay channel","authors":"Qiang Xue, G. Abreu","doi":"10.1109/SPAWC.2010.5671269","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671269","url":null,"abstract":"We consider cooperative relaying systems employing amplify-and-forward (AF) distributed space-time block codes (DSTBCs) in which only backward channel-state-information (CSI) is known at relays and destination. For such systems, we study the particular case where, in order to minimize overhead, each of N relays decide independently whether to join the cooperation with basis on the received signal as compared to a certain threshold. Since in such a scheme the number of active relays K at a given realization is random, the channel becomes a random set relay channel (RSRC). The mutual information (MI) of AF-DSTBC in the RSRC are analyzed, addressing the ergodic delay-tolerant case. Results on MI are given in the form of three different upper bounds, each offering a different trade-offs of complexity and closeness. It is found that the maximal MI is not achieved under full-time-all-relay cooperation (K = N), even if the total power at the receiver increases with K. It is also shown that the optimum power allocation depends on the threshold, such that the MI is maximized not under equal power allocation, but rather when more power is allocated to the second stage (relaying).","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128443948","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
Block diagonalization with algebraic interference control, extension to precoding on OFDMA chunks 具有代数干扰控制的块对角化，扩展到OFDMA块的预编码
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670971
A. Riahi, M. Kamoun
{"title":"Block diagonalization with algebraic interference control, extension to precoding on OFDMA chunks","authors":"A. Riahi, M. Kamoun","doi":"10.1109/SPAWC.2010.5670971","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670971","url":null,"abstract":"Block diagonalization is a linear precoding technique which allows to suppress multi-user interference at the transmitter side. However, the interference cancellation comes at the cost of reduced number of degrees of freedom for users. We present in this contribution a new block diagonalization extension that increases the number of degrees of freedom for a subset of preferred terminals using an algebraic parameter. We show how this extension can be used in resource allocation in order to provide a better rate for high priority users without increasing the transmit power. With this scheme, the new algebraic parameter is used in addition to the transmit power in order to provide different priorities to the served users. Also, we investigate two low complexity approaches to exploit block diagonalization techniques in OFDMA scenarios by calculating one precoder for a chunk of sub-carriers. We compare these two methods in terms of sum capacity and sensitivity to the new parameter.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128936861","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
An H∞ filtering approach for robust tracking of OFDM doubly-selective channels 一种用于OFDM双选择信道鲁棒跟踪的H∞滤波方法
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670992
P. Banelli, L. Rugini
{"title":"An H∞ filtering approach for robust tracking of OFDM doubly-selective channels","authors":"P. Banelli, L. Rugini","doi":"10.1109/SPAWC.2010.5670992","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670992","url":null,"abstract":"In OFDM systems, fast time-varying channels can be effectively estimated and tracked by coupling a channel basis expansion model with a Kalman filtering approach. Although the Kalman filter is asymptotically MSE-optimal when the channel statistics are known, it may suffer some performance degradation in the presence of statistical mismatches. We propose to estimate OFDM doubly-selective channels by an H∞ filtering approach that, although suboptimal in the MSE sense, is more robust than classical Kalman filtering to statistical mismatches. Simulation results and performance comparisons assess the effectiveness of the proposed solution.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125840674","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
Sparse sampling for Software Defined Radio receivers 软件无线电接收机的稀疏采样
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671084
F. Palmieri, E. Venosa, A. Petropulu, G. Romano, P. Salvo Rossi
{"title":"Sparse sampling for Software Defined Radio receivers","authors":"F. Palmieri, E. Venosa, A. Petropulu, G. Romano, P. Salvo Rossi","doi":"10.1109/SPAWC.2010.5671084","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671084","url":null,"abstract":"In this paper we address the problem of designing a back-end for Software Defined Radio (SDR) receiver using only one low-rate Analog-to-Digital Converter (ADC). After the Intermediate Frequency (IF) down-conversion stage, the signals are sampled and all the other demodulation tasks are assigned to a Digital Signal Processor (DSP). In this paper we concentrate on only one Quadrature Amplitude Modulation (QAM) signal. After reduction of the communication chain to a linear model, the issue of proper sampling rate choice is addressed. It is shown how improper sampling rate can lead to a poorly conditioned problem that causes symbol cancelations and poor performances. In the analysis the role of the device noise at the input of the ADC is also addressed by computing autocorrelation and Power Spectral Density (PSD) after undersampling. Some simulations confirm the analysis.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126311946","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
Channel reliability factor estimation for LTE systems LTE系统信道可靠性因子估计
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670812
C. Carbonelli, S. Franz
{"title":"Channel reliability factor estimation for LTE systems","authors":"C. Carbonelli, S. Franz","doi":"10.1109/SPAWC.2010.5670812","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670812","url":null,"abstract":"This paper addresses the problem of turbo decoding in the presence of non-ideal knowledge of the channel parameters. A practical OFDM system employing an interpolation based channel estimator is considered and a scheme for deriving the corresponding channel reliability factor to be passed to the turbo decoder is presented. Simulations are carried out for a realistic multicarrier system operating in the framework of a Long Term Evolution air interface. Our results show that a performance gain can be achieved with a limited increase in complexity by estimating the channel reliability factor with the proposed method in contrast to a system that ignores the imperfections in the channel estimates.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124515265","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
Channel-matched trellis codes for finite-state intersymbol-interference channels 有限状态符号间干扰信道的信道匹配网格码
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670890
T. Lang, A. Mezghani, J. Nossek
{"title":"Channel-matched trellis codes for finite-state intersymbol-interference channels","authors":"T. Lang, A. Mezghani, J. Nossek","doi":"10.1109/SPAWC.2010.5670890","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670890","url":null,"abstract":"This paper addresses the optimization of constrained stationary Markov input processes which achieve high information rates on intersymbol-interference (ISI) channels. The considered Markov processes define an optimized subset of equiprobable input symbols for each channel state and are thus uniquely described by the set of branches in a trellis section. We propose an iterative algorithm that efficiently solves the optimization problem. The algorithm successively removes the worst branches and thereby constructs a reduced trellis code that is matched to the channel. The second contribution of this paper are tight lower bounds for the mutual information rate (MIR) of Markov sources on ISI channels with finite input and output alphabets. The bounds can be evaluated within a small trellis window without using Monte Carlo methods.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127862994","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 diversity schemes in decentralized estimation 分散估计中的分集方案
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671086
Alex S. C. Leong, S. Dey
{"title":"On diversity schemes in decentralized estimation","authors":"Alex S. C. Leong, S. Dey","doi":"10.1109/SPAWC.2010.5671086","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671086","url":null,"abstract":"This paper is concerned with the decentralized estimation of a Gaussian source using multiple sensors. We consider a diversity scheme where only the sensor with the best channel sends their measurements to a fusion center, using the analog amplify and forwarding technique. A distributed version of the diversity scheme where sensors decide what to transmit based only on their local information is also considered. We derive asymptotic expressions for the expected distortion of these schemes as the number of sensors becomes large. We also study the optimal power allocation problem for minimizing the expected distortion subject to average power constraints.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129162505","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
Antenna selection for opportunistic interference management in MIMO broadcast channels MIMO广播信道中机会干扰管理的天线选择
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670902
Lemonia Dritsoula, Zheng Wang, H. Sadjadpour, J. Garcia-Luna-Aceves
{"title":"Antenna selection for opportunistic interference management in MIMO broadcast channels","authors":"Lemonia Dritsoula, Zheng Wang, H. Sadjadpour, J. Garcia-Luna-Aceves","doi":"10.1109/SPAWC.2010.5670902","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670902","url":null,"abstract":"Opportunistic interference management (OIM) is an approach that can asymptotically achieve dirty paper coding (DPC) capacity in the downlink of wireless cellular networks with minimum feedback requirement. With K antennas at the base station and M mobile users in the cell, the proposed technique requires only K integer numbers related to channel state information (CSI). This multiplexing gain of K is achieved at the expense of M mobile users such that K = Θ(logM). We introduce an antenna selection scheme at the base station to reduce the minimum number of required mobile users significantly at the expense of reasonable increase in feedback.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116015436","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
ML blind channel estimation in OFDM using cyclostationarity and spectral factorization 基于循环平稳和频谱分解的OFDM中ML盲信道估计
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671265
A. A. Quadeer, T. Al-Naffouri
{"title":"ML blind channel estimation in OFDM using cyclostationarity and spectral factorization","authors":"A. A. Quadeer, T. Al-Naffouri","doi":"10.1109/SPAWC.2010.5671265","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671265","url":null,"abstract":"Channel estimation is vital in OFDM systems for efficient data recovery. In this paper, we propose a blind algorithm for channel estimation that is based on the assumption that the transmitted data in an OFDM system is Gaussian (by central limit arguments). The channel estimate can then be obtained by maximizing the output likelihood function. Unfortunately, the likelihood function turns out to be multi-modal and thus finding the global maxima is challenging. We rely on spectral factorization and the cyclostationarity of the output to obtain the correct channel zeros. The Genetic algorithm is then used to fine tune the obtained solution.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117221273","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
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