Reduced-Complexity Iterative Markov Chain MBER Detection for MIMO Systems

A novel Markov chain (MC) representation aided minimum bit error rate (MBER) detection method is proposed for an M-QAM modulated SDM/SDMA uplink system. Compared to the conventional MBER scheme, the proposed MC-MBER scheme is capable of reducing the complexity imposed with the aid of its efficient detection candidate set generation assisted by the Markov chain process. Our performance results demonstrate that the MC-MBER multiuser detection (MUD) is capable of reducing the computational complexity by a factor of eight in comparison to the conventional MBER MUD in a rank-deficient system transmitting four 4-QAM substreams with the aid of two receive antennas, while achieving a BER performance comparable to that of the MBER MUD.