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Iterative multiuser joint detection and parameter estimation: a factor-graph approach

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3 Author(s)
Caire, G. ; Inst. Eurecom, Sophia Antipolis, France ; Tulino, A. ; Biglieri, Ezio

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

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Information Theory Workshop, 2001. Proceedings. 2001 IEEE

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