Approximate Joint MAP Detection of Co-Channel Signals

摘要

We consider joint detection of co-channel signals---specifically, signalswhich do not possess a natural separability due to, for example, the multipleaccess technique or the use of multiple antennas. Iterative joint detection anddecoding is a well known approach for utilizing the error correction code toimprove detection performance. However, the joint maximum a posterioriprobability (MAP) detector may be prohibitively complex, especially in amultipath channel. In this paper, we present an approximation to the joint MAPdetector motivated by a factor graph model of the received signal. The proposedalgorithm is designed to approximate the joint MAP detector as closely aspossible within the computational capability of the receiver.