A Reduced Rank Decorrelating Rake Receiver For Cdma Communications Over Frequency Selective Channels
2001 IEEE WORKSHOP ON STATISTICAL SIGNAL PROCESSING PROCEEDINGS(2001)
摘要
CDMA systems need simultaneous multiple access interference suppression and adaptive interference suppression filters that may span three symbols. Thus, a large number of filter coefficients need to be estimated. By the use of reduced rank filtering, it is possible to lower the number of required filter coefficients with a small decrease in performance. In [1], a successful attempt for non-dispersive CDMA signals was made to develop a reduced rank algorithm based on the multistage Wiener (MSW) filter of Goldstein and Reed [2]. In this paper, motivated by MSW we propose a reduced rank decorrelating RAKE receiver for dispersive CDMA signals. The proposed receiver is blindly implemented in a lower dimensional space, relative to the full-rank receivers, without the aid of training sequences and the channel information. By exploiting the structure of the user signature waveform, the proposed receivers exhibit performance close to that of the reduced rank MMSE receiver implemented with the desired user's known channel information.
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关键词
cdma,code division multiple access,fading,computational complexity,information theory,radio receivers,adaptive signal processing,filter coefficients,adaptive filters,decorrelation,rake receiver,multipath
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