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1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)最新文献

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A general framework for multirate joint precoder-equalizer 多速率联合预编码均衡器的通用框架
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783017
D. Wei
{"title":"A general framework for multirate joint precoder-equalizer","authors":"D. Wei","doi":"10.1109/SPAWC.1999.783017","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783017","url":null,"abstract":"We propose a new framework for joint precoder-equalizer based on a multirate filterbank. Our framework generalizes all the existing multirate joint precoder-equalizer structures in the literature and hence permits more degrees of freedom in the design to incorporate useful features. Based on multirate system theory, we convert the proposed framework into an equivalent but simpler frequency-domain representation that permits flexible designs. We propose the novel concept of channel-independent precoders and address their advantages over the existing precoders, which all require the knowledge of channel impulse responses.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115670238","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 equalization using one-tap DFE for wireless OFDM systems with ICI and ISI 带ICI和ISI的无线OFDM系统的一分频DFE信道均衡
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783040
Yi Sun, L. Tong
{"title":"Channel equalization using one-tap DFE for wireless OFDM systems with ICI and ISI","authors":"Yi Sun, L. Tong","doi":"10.1109/SPAWC.1999.783040","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783040","url":null,"abstract":"In an OFDM system for wireless communications, a guard interval longer than channel delay has to be used to avoid interchannel interference (ICI) and intersymbol interference (ISI), and so the multiplexed subchannels can be decoupled by the discrete Fourier transform (DFT). However, this ICI- and ISI-free OFDM system reduces the efficiency of bandwidth usage and prevents the use of sufficient statistics in channel equalization. In this paper, we consider the OFDM system that achieves one hundred percent efficiency of bandwidth usage and uses sufficient statistic. A one-tap decision feedback equalizer (DFE) is proposed. It is demonstrated that though occupying narrower bandwidth, the one-tap DFE based, ICI and ISI OFDM system achieves lower symbol error rate and higher mutual information between input of decision device and transmitted symbols.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116369077","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: 13
Signal recovery and amplitude-phase tracking in wireless communications 无线通信中的信号恢复和幅度相位跟踪
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783102
D. Huang, L. White
{"title":"Signal recovery and amplitude-phase tracking in wireless communications","authors":"D. Huang, L. White","doi":"10.1109/SPAWC.1999.783102","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783102","url":null,"abstract":"This paper addresses the problem of demodulating a digital communications signal in the presence of unknown channel complex gain. We derive the Cramer-Rao lower bound for tracking the channel gain in the presence of additive white Gaussian noise. This bound establishes effective lower bounds for the signal-to-noise ratio on the channel, given the statistics of the channel gain variations. Several approaches for tracking the gain are derived based on the application of Bayes theorem, and the approximation of soft decision symbol statistics by a Gaussian density. The performance of the tracker is examined using simulated and real data.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116476397","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
Nonlinear MMSE interference cancellation for asynchronous CDMA channels with convolutional coding 基于卷积编码的异步CDMA信道非线性MMSE干扰消除
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783012
S. Gollamudi, Yih-Fang Huang
{"title":"Nonlinear MMSE interference cancellation for asynchronous CDMA channels with convolutional coding","authors":"S. Gollamudi, Yih-Fang Huang","doi":"10.1109/SPAWC.1999.783012","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783012","url":null,"abstract":"A trellis-based algorithm is derived in this paper for nonlinear MMSE estimation of convolutionally encoded signals in asynchronous CDMA channels with random spreading. Iterative nonlinear MMSE multiuser detection, proposed by the authors earlier for uncoded systems, is extended to forward error-correcting (FEC) coded CDMA systems by employing this algorithm. The resulting receiver is a Turbo-like combined FEC decoder and multiuser detector whose complexity is linear in the number of users. The proposed trellis-based estimation algorithm has the same order of complexity in the number of states of the FEC code as the Viterbi algorithm for optimal decoding of convolutional codes. Simulation results indicate that the proposed cancellation scheme can offer substantial improvement in performance over three other schemes in terms of cancellation error, capacity increase and tolerance to deep fades.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124075419","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
Iterative algorithms for blind interference suppression in CDMA CDMA中盲干扰抑制的迭代算法
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783054
T. Ristaniemi, J. Joutsensalo
{"title":"Iterative algorithms for blind interference suppression in CDMA","authors":"T. Ristaniemi, J. Joutsensalo","doi":"10.1109/SPAWC.1999.783054","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783054","url":null,"abstract":"In this paper, we introduce a novel iterative algorithm for blind interference suppression for CDMA systems. The algorithm needs no knowledge of any codes and it is derived from an optimization criterion. More precisely, it can be regarded as a modification of blind linear MMSE algorithm which avoids channel and chip timing estimation. Also a simplified variant using a short training sequence is considered. Simulations show how the proposed methods have better interference suppression capabilities compared to conventional matched filter based single user detector and subspace based blind linear MMSE detector.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122451115","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
Blind equalization for MIMO for channels based only on second order statistics by use of pre-filters 利用预滤波器对仅基于二阶统计量的信道进行盲均衡
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783030
H. Luo, Ruey-Wen Liu
{"title":"Blind equalization for MIMO for channels based only on second order statistics by use of pre-filters","authors":"H. Luo, Ruey-Wen Liu","doi":"10.1109/SPAWC.1999.783030","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783030","url":null,"abstract":"By the use of pre-filters, the uncorrelated white source signals can be separated from an unknown MIMO (multiple-input-multiple-output) FIR channel based only on the second order statistics of the received signals. Precisely, if the white source signals are mutually uncorrelated, then a set of special pre-filters with order K can be designed so that the unknown MIMO FIR channel is equalized if, and only if, the output signals of the equalizer are mutually uncorrelated and K-step temporally uncorrelated. A method for designing such pre-filters is given. These results can be applied to wireless communications for building a new multiple-access method potentially, by which multiple signals can be transmitted on the same narrow-band carrier simultaneously.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128882362","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
Fractionally-spaced array processing for fast fading cellular TDMA signals using cyclic higher-order cumulants 基于循环高阶累积量的快衰落蜂窝TDMA信号的分数间隔阵列处理
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783075
M. Martone
{"title":"Fractionally-spaced array processing for fast fading cellular TDMA signals using cyclic higher-order cumulants","authors":"M. Martone","doi":"10.1109/SPAWC.1999.783075","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783075","url":null,"abstract":"A new approach to cochannel interference rejection in frequency selective fading using an antenna array is presented. The fundamental idea is to exploit the higher-order cyclostationarity of the digitally modulated signals received at the antenna array. The problem of minimizing the noise-free time averaged mean squared error is shown to be equivalent to the problem of minimizing a cost function involving space-time contractions of fourth-order cyclic cumulants. The method is effective in fast fading environments such as those specified in IS-136, the US digital TDMA cellular standard. Results of computer simulations and hardware experiments are presented.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129065621","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
Multichannel estimation by blind MMSE ZF equalization 盲MMSE ZF均衡多信道估计
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783066
J. Ayadi, D. Slock
{"title":"Multichannel estimation by blind MMSE ZF equalization","authors":"J. Ayadi, D. Slock","doi":"10.1109/SPAWC.1999.783066","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783066","url":null,"abstract":"We investigate a new multichannel estimation method based on blind MMSE ZF equalization. The recently proposed method by Tsatsanis et al. (1997) corresponds to unbiased MMSE equalization. We interpret this approach in terms of two-sided linear prediction (TSLP), also called smoothing by Tong (1998). We establish the links between MMSE, minimum output energy (MOE) and MMSE ZF and we prove equivalence under the unbiasedness constraint in the noiseless case. Our analysis shows how to properly apply Capon's principle (1969) for linearly constrained minimum variance (LCMV) beamforming to multichannel equalization. Furthermore, we show that Tsatsanis's application of Capon's principle becomes only correct, and Tong's channel estimate becomes only unbiased, at high SNR. Whereas the goal is to do MMSE ZF, it is easier to approach the problem via unbiased MMSE (UMMSE) on noiseless data. Hence, the covariance matrix of the received signal has to be \"denoised\" before using it in the blind estimation method. We provide an approach without eigen-decomposition that shows excellent performance. Simulation results are presented to support our claims.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129964538","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
Adaptive space-time feedforward/feedback detection for CDMA CDMA的自适应时空前馈/反馈检测
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783011
J. E. Smee, S. Schwartz
{"title":"Adaptive space-time feedforward/feedback detection for CDMA","authors":"J. E. Smee, S. Schwartz","doi":"10.1109/SPAWC.1999.783011","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783011","url":null,"abstract":"We investigate linear and nonlinear minimum mean-square error (MMSE) multiuser detectors for high data rate wireless code-division multiple access (CDMA) networks. The reverse link spacetime detectors comprise an antenna array followed by a feedforward filter (FFF) which processes parallel chip matched filter (CMF) output samples and a feedback filter (FBF) which processes detected symbols of all in-sector users. We explore adaptation issues, calculate outage probabilities, and isolate the effects of antenna, diversity, and interference suppression gains for Rayleigh and Ricean multipath fading channels with varying timing control.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124956549","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
User separation in DS-CDMA systems with unknown long PN spreading codes 长PN扩展码未知的DS-CDMA系统中的用户分离
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783052
N. Sidiropoulos, R. Bro
{"title":"User separation in DS-CDMA systems with unknown long PN spreading codes","authors":"N. Sidiropoulos, R. Bro","doi":"10.1109/SPAWC.1999.783052","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783052","url":null,"abstract":"We consider the user separation problem for CDMA transmissions employing unknown long PN spreading codes. Using the analytical framework underlying our recent results for symbol-periodic spreading, but this time capitalizing on the properties of PN sequences, we show that user separation is possible, provided sufficient spreading is available. Once separated, the individual user data streams may be equalized using single-user blind equalization techniques.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121859541","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
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