Abstract

In this paper, we investigate joint channel estimation and signal detection approaches for a multi-user CDMA uplink with a base-station antenna array over asynchronous multipath fading channels. Based on the space alternating generalized expectation-maximization (SAGE) algorithm, we develop an iterative multi-user receiver to jointly estimate channel response vectors and bit sequences for all the active users at known fractional time delays, and a BER lower bound is derived. A simplified bit detection method is then proposed for multi-rate CDMA systems. Simulation results show that the new iterative receiver performs equally well for both high- and low-rate users, and the BER performance is close to that of the BER lower bound. Copyright © 2003 AEI.

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