A Transmit Preprocessing Technique for Downlink SDMA in Multi-user MIMO Channels
多用户MIMO系统下行链路的空分多址发送预滤波技术研究

A transmit preprocessing technique for downlink spatial multiplexing in multi-user MIMO channels is proposed in this paper. Through adding additional constraint to the joint TX-RX MMSE optimization scheme the equivalent channel can be changed from block-diagonalization to complete diagonalization. Thus both MUI (Multi-User Interference) and per-user multi-stream interference can be canceled simultaneously. Besides the general advantage of the algorithms based on block-diagonalization, the modified algorithm is much more feasible and has the advantage of simplifying the receivers.