Adaptive filter theory (2nd ed.)
Adaptive filter theory (2nd ed.)
Inverse filtering criteria for CDMA systems
IEEE Transactions on Signal Processing
Blind multiuser channel estimation in asynchronous CDMA systems
IEEE Transactions on Signal Processing
A multistage representation of the Wiener filter based on orthogonal projections
IEEE Transactions on Information Theory
Wireless Personal Communications: An International Journal
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Decorrelating RAKE receiver for asynchronous CDMA systems may require decorrelating matched filters that may span over multiple symbols. Thus, a large number of decorrelating matched 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 (Proceedings of IEEE Asilomar Conference on Signals, Systems Computations, Pacific Grove, CA, November 1998, pp. 1106-1110), a successful attempt for non-dispersive CDMA signais was made to develop a reduced rank algorithm based on the multi-stage Wiener filter (MSWF) of Goldstein et al. (IEEE Trans. Inf. Theory 44 (7) (November 1998) 2943 -2959). In this paper, motivated by MSWE, we propose reduced rank RAKE receivers for asynchronous CDMA signals over frequency-selective channels. The proposed receivers are 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 minimum mean square error receiver implemented with the desired user's known channel information.