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 SDMA in Multi-user MIMO Channels

该文提出了一种用于多用户MIMO系统下行链路的空分多址发送预滤波技术,通过在目前已有的基于块对角化的联合TX-RX MMSE算法的基础上,增加新的约束条件,使等效信道由块对角化矩阵变为完全对角化矩阵, 就可以在发送端同时将多用户干扰(MUI)和用户内部各根天线之间的干扰完全消除。改进后的算法除了具有基于块对角化的算法的特点外,还具有更切实可行,简化接收机设计的优点。

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.