Title :
Iterative multiuser joint detection and parameter estimation: a factor-graph approach
Author :
Caire, Giuseppe ; Tulino, Antonia ; Biglieri, Ezio
Author_Institution :
Inst. Eurecom, Sophia Antipolis, France
fDate :
6/23/1905 12:00:00 AM
Abstract :
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
Keywords :
AWGN channels; code division multiple access; graph theory; interference suppression; iterative decoding; least squares approximations; multiuser channels; parameter estimation; probability; signal detection; spread spectrum communication; AWGN channel; channel amplitude; factor-graph approach; information bits; iterative multiuser joint detection/parameter estimation; joint a posteriori probability measure; multiple-access channel; noise variance parameters; soft decision-driven least-squares estimation; soft interference cancellation; sum-product algorithm; synchronous DS-CDMA; unknown channel parameters; AWGN channels; Additive white noise; Gaussian noise; Interference cancellation; Iterative decoding; Multiaccess communication; Noise cancellation; Noise level; Parameter estimation; Sum product algorithm;
Conference_Titel :
Information Theory Workshop, 2001. Proceedings. 2001 IEEE
Conference_Location :
Cairns, Qld.
Print_ISBN :
0-7803-7119-4
DOI :
10.1109/ITW.2001.955128
