Joint source-channel and multiuser decoding for Rayleigh fading CDMA Channels

We consider joint source-channel and multiuser decoding for frequency-selec tive Rayleigh fading code-division multiple-access channels. The block sour ce-channel encoder is defined by a vector quantizer, We investigate optimal (minimum mean-square error) decoding and "user-separated" decoding of lowe r complexity, The studied decoders are soft in the sense that they utilize all soft information available at the receiver. Simulations indicate signif icant performance gains of the introduced decoders compared with a tandem a pproach that uses maximum-likelihood multiuser detection plus table-lookup decoding.