We examine a multiple access AWGN channel with synchronous DS CDMA in which the channel amplitude and noise variance parameters are unknown a priori We derive an iterative joint multiuser decoder and parameter estimator based on soft interference cancellation and on soft decision driven least squares estimation Our derivation is obtained by applying the sum product algorithm to the factor graph of the joint a posteriori probability measure of the information bits and of the unknown channel parameters
Iterative multiuser joint detection and parameter estimation : a factor graph approach
ITW 2001, IEEE Information Theory Workshop, September 2-7, 2001, Cairns, Australia
Systèmes de Communication
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