Semiblind linear multiuser interference cancellation: a maximum likelihoodapproach

This paper introduces a linear interference suppression algorithm based on the maximum likelihood principle. The method is termed semiblind because it simultaneously exploits the transmission of training sequences and the sta tistics of the unknown transmitted symbols. We propose both iterative and a daptive implementations of the receiver using the expectation maximization algorithm and the matrix inversion lemma, respectively. Computer simulation s show that the resulting multiuser receivers attain practically the same p erformance as the linear minimum mean square error multiuser detector. (C) 2001 Elsevier Science B.V. All rights reserved.