Soft Demodulation with Interference Cancellation/Suppression for M-ARY DS-CDMA System

P. Xiao, R. Carrasco (UK), and E. Ström (Sweden)

Keywords

code division multiple access, iterative soft demodulation, interference cancellation, interference suppression.

Abstract

The system under study is a convolutionally coded M-ary orthogonal DS-CDMA system in time-varying frequency selective Rayleigh fading channels. With emphasis on the development of several soft demodulation algorithms, we propose an iterative multi-function process integrating de modulation, decoding and multiuser detection in this paper. The performance of the proposed algorithms are evaluated numerically and proved to achieve substantial performance gain compared to the conventional demodulation and de coding scheme, especially when the soft demodulator is assisted by interference cancellation or suppression tech niques.

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