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This paper proposes a unified approach to joint adaptive parameter estimationand interference cancellation (IC) for direct sequencecode-division-multiple-access (DS-CDMA) systems in multipath channels. Aunified framework is presented in which the IC problem is formulated as anoptimization problem with extra degrees of freedom of an IC parameter vectorfor each stage and user. We propose a joint optimization method for estimatingthe IC parameter vector, the linear receiver filter front-end, and the channelalong with minimum mean squared error (MMSE) expressions for the estimators.Based on the proposed joint optimization approach, we derive low-complexitystochastic gradient (SG) algorithms for estimating the desired parameters.Simulation results for the uplink of a synchronous DS-CDMA system show that theproposed methods significantly outperform the best known IC receivers.

A Unified Approach to Joint and Iterative Adaptive Interference Cancellation and Parameter Estimation for CDMA Systems in Multipath Channels