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Variable step-size LMS blind CDMA multiuser detectors

Gong, Y., Farhang-Boroujeny, B. and Lim, T. J. (2001) Variable step-size LMS blind CDMA multiuser detectors. In: IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP'01), 7-11 May 2001, Salt Lake City, UT, pp. 2285-2288.

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Adaptive least mean square (LMS) filters with or without training sequences, which are known as training-based and blind detectors respectively, have been formulated to counter interference in CDMA systems. The convergence characteristics of these two LMS detectors are analyzed and compared in this paper. We show that the blind detector is superior to the training-based detector with respect to convergence rate. On the other hand, the training-based detector performs better in the steady state, giving a lower excess mean-square error (MSE) for a given adaptation step size. A novel decision-directed LMS detector which achieves the low excess MSE of the training-based detector and the superior convergence performance of the blind detector is proposed.

Item Type:Conference or Workshop Item (Paper)
ID Code:19302
Uncontrolled Keywords:LMS detectors, LMS filters, MAI, MSE, adaptive filters, blind CDMA multiuser detector, code-division multiple-access system, interference suppression, least mean square filters, mean-square error, multiple-access interference, training-based detectors
Additional Information:Proceedings ISBN: 0780370414
Publisher:IEEE Press

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