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

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

36

Lastpage

38

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Information Theory Workshop, 2001. Proceedings. 2001 IEEE

Conference_Location

Cairns, Qld.

Print_ISBN

0-7803-7119-4

Type

conf

DOI

10.1109/ITW.2001.955128

Filename

955128