| We present maximum a posteriori (MAP) detectors for the matrix of transmitted symbols in a multiuser system in which the received signal is the sum of K cochannel continuous phase modulated (CPM) signals and additive white Gaussian noise. We illustrate that the MAP matrix detector consists of K sets of front-end matched filters followed by a Viterbi algorithm. We also present a family of reduced complexity receivers in which performance and complexity have a reciprocal relationship. Performance analysis and computer simulation results are presented for the optimum and reduced complexity receivers, with particular attention given to cochannel Gaussian minimum shift keyed (GMSK) signals, a class of CPM employed in cellular and personal communication services (PCS) networks worldwide. |
