In this paper we consider the problem of joint detection and decoding for CDMA systems that employ forward error control (FEC). The main problems encountered in designing this type of receiver include high complexity and a lack of robustness in impulsive noise and contamination in the prior model. In this paper, we propose that the extrinsic information may not need to be absolutely reliable as we consider impulsive interference. By allowing the judgement of confidence in using this extrinsic information, the proposed M-estimation based soft-in soft-out (SISO) detector exhibits robust performance for a low complexity.
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