Block Diagonalization based MMSE vector perturbation precoding for multiuser MIMO down-link transmission

Commonly Block Diagonalized (BD) is employed to cancel the Multi-User Interference (MUI) of the different users´ in multiuser MIMO broadcast channel. Previous proposed Vector Perturbation (VP) algorithm combined with BD can improve the transmission performance and nearly reaches the multi-user sum capacity. In this paper, by means of seeking better cost function, we propose a new approach which uses the he Minimum Mean Square Error (MMSE) VP algorithm for the actual transmit signal in BD based multiuser MIMO downlink transmission. Numerical simulation shows that the proposed method provides more better bit error rate (BER) than other techniques.