Abstract:

In a block diagonal (BD) algorithm based multi-user MIMO downlink transmission system, a dramatic capacity loss is introduced when there is a strong correlation among row vectors of the different users' channel matrix. Specifically, two parameters for measuring the correlation are investigated. For the purpose of recovering the capacity loss, a joint transceiver design is proposed, where based on the BD algorithm at the transmitter side, a decorrelation postprocessing (DP) algorithm is invoked on the receiver side. Then computer simulation results show that the proposed joint transceiver design can efficiently improve the system capacity in the case of correlated channels.

Key words: multiuser MIMO, spatial multiplexing, correlated channel, block diagonalization, joint transceiver design