Microwave Mobile Communications
Microwave Mobile Communications
An asymptotic analysis of DS/SSMA communication systems with random polyphase signature sequences
IEEE Transactions on Information Theory
Optimum soft-output detection for channels with intersymbol interference
IEEE Transactions on Information Theory
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An adaptive maximum \emph{a posteriori} (MAP) receiver withmultiple-access interference (MAI) mitigation is proposed for DS-CDMAsystems in frequency-flat, time-varying fading channels. The receiverconsists of a sequence matched filter (MF), an adaptive channelestimator, and a MAP demodulator. By oversampling the MF output, thereceiver can characterize the MAI symbol-by-symbol to suppress thestrong and time-varying MAI. Without any pilot insertion and \emph{apriori} knowledge, the channel estimator can adapt to various fadingchannels using a general, model-based approach. For practicalimplementations, a reduction in complexity is introduced and is shownto have a negligible effect on both uncoded and decoded bit errorrates (BER's).