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CMA-based adaptive 2-D RAKE receivers for QS DS-CDMA systems over frequency-selective channels

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3 Author(s)
Cheung, P.K.P. ; Telecomm. Eng. Group, Australian Nat. Univ., Canberra, ACT, Australia ; Rapajic, P.B. ; Kennedy, R.A.

The problem of blind multiuser detection is considered for quasi-synchronous (QS) direct-sequence code-division-multiple-access (DS-CDMA) systems over frequency-selective channels. We show that the beamforming approach in the conventional 2-D RAKE receiver does not exploit the full potential of using multiple antennas. We propose a novel RAKE receiver structure which uses linear filtering in a joint spatio-temporal fashion. The filters are blindly adapted based on the constant modulus algorithm (CMA) which has been shown to converge to a decorrelator detector. In comparison with the 2-D RAKE receiver, it offers superior performance, computational simplicity and is more near-far resistant. Also unlike the 2-D RAKE receiver, it does not assume knowledge of all multipath delays

Published in:

Information Theory, 1998. Proceedings. 1998 IEEE International Symposium on

Date of Conference:

16-21 Aug 1998