MMSE space-time multi-user detection in MIMO-OFDM system

MIMO-OFDM is considered as candidates for future 3G/B3G broadband wireless services. High quality mobile services have to eliminate multiple-access interference (MAI) that affects multi-user receiver performance in MIMO-OFDM system. For conventional MIMO system, the various multiplexing schemes are proposed under multiple user scenarios in order to gain the appropriate performance. In this paper, we analyze the effect of MAI on MIMO-OFDM system and propose an adaptive MMSE space-time multi-user detector for MIMO-OFDM system. We adopt the Lagrange multipliers method and extend the constraint space scheme for decreasing the complexity of system. The simulation experiments make suitable comparisons for the different users and the different SNR conditions in the novel scheme for the MIMO-OFDM system. The results show that the scheme has some significant.