Performance enhancement with applying FSS and ASB method for MU-MIMO

Multi-user multi-input multi-output (MU-MIMO) can achieve more transmission speed and multi-user diversity. Furthermore, since frequency symbol spreading (FSS) can mitigate the effect of frequency selective fading, it is useful for improving the BER performance. However, FSS cannot be applied to MIMO system with adding forward error correction (FEC) due to interference of the transmit antennas. In this paper, we consider the difference of the transmitted power for each user and the difference of the distance from base station (BS) to each user in general mobile wireless communications, we propose that applying FSS and adaptive subcarrier block (ASB) method with considering the imbalanced transmitted power for MU-MIMO. From the simulation results, it is shown that the proposed scheme can achieve a superior BER and throughput performance.