Adaptive MBER Space-Time DFE Assisted Multiuser Detection for SDMA Systems

In this contribution we propose a space-time decision feedback equalization (ST-DFE) assisted multiuser detection (MUD) scheme for multiple antenna aided space division mul-tiple access systems. A minimum bit error rate (MBER) design is invoked for the MUD, which is shown to be capable of im-proving the achievable bit error rate performance over that of the minimum mean square error (MMSE) design. An adap-tive MBER ST-DFE-MUD is proposed using the least bit error rate algorithm, which is demonstrated to consistently outper-form the least mean square (LMS) algorithm, while achieving a lower computational complexity than the LMS algorithm for the binary signalling scheme. Simulation results demonstrate that the MBER ST-DFE-MUD is more robust to channel estima-tion errors as well as to error propagation imposed by decision feedback errors, compared to the MMSE ST-DFE-MUD. I