A Grouped Precoding in MU-MIMO Downlink

Based on the nature of multi-user multiple-input multiple-output (MIMO) system, a novel downlink grouped-joint transmission (GJT) precoding algorithm is put forward by using grouping technique. In the proposed algorithm, users and their corresponding transmitting signals are partitioned into G groups before been transmitted. Sequentially, the dimensions of channel matrix and other correlative data are reduced, which not affect the performance. Simulation results show that the GJT scheme improve the bit error rate (BER) performance while the complexity of base station (BS) is reduced.