Title :
BEM-based multiuser detection for synchronous DS-CDMA systems over frequency flat fading channels
Author :
Gallo, A.S. ; Chiavaccini, E. ; Vitetta, G.M.
Author_Institution :
Dept. of Inf. Eng., Modena Univ., Italy
Abstract :
A soft-input soft-output (SISO) multiuser detection algorithm for synchronous direct sequence-code division multiple access (DS-CDMA) systems operating over a slow Rayleigh fading channel is illustrated. Its derivation is based on the Bayesian expectation maximization (BEM) technique. The proposed detector estimates the fading channel in an iterative fashion and produces the a posteriori probabilities (APPs) of the transmitted symbols. Its error performance is assessed by computer simulation and is compared with that provided by other multiuser detectors.
Keywords :
Bayes methods; Rayleigh channels; channel estimation; code division multiple access; error statistics; iterative methods; maximum likelihood estimation; multiuser detection; optimisation; probability; spread spectrum communication; Bayesian expectation maximization; Rayleigh fading channel; a posteriori probabilities; channel estimation; flat fading channels; iterative estimation; maximum likelihood estimation; multiuser detection; soft-input soft-output detection; synchronous DS-CDMA; synchronous direct sequence-code division multiple access; Bayesian methods; Chirp modulation; Covariance matrix; Detection algorithms; Detectors; Fading; Frequency estimation; Gaussian noise; Multiaccess communication; Multiuser detection;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2002. The 13th IEEE International Symposium on
Print_ISBN :
0-7803-7589-0
DOI :
10.1109/PIMRC.2002.1045236
