中文摘要：

针对多小区多用户TDDMIMO下行链路，提出了一种基于预编码的联合干扰抑制算法。首先，利用广义MMSE信道逆的OR分解设计预编码矩阵抑制下行链路的多用户干扰（MUI）。然后，从信号能量泄露的角度设计第二个预编码矩阵抑制小区间干扰（ICI）和残留的多用户干扰。该算法能够利用TDDMIMO信道的互易性，不需要用户端的反馈。在市区微小区组成的多用户TDDMIMO系统中的仿真结果表明，该算法能有效地提高系统容量和用户端平均信干噪比（s烈R）。

英文摘要：

To suppress multi-user interference （MUI） and inter-cell interference （ICI） existing in multi-cell multi-user TDD MIMO downlink, an interference suppression algorithm through designing precoder was proposed. Firstly, a precoding matrix was designed for MUI suppression, with the help of the QR decomposition of generalized MMSE channel inversion. And then the second precoding matrix was designed to suppress ICI and residual MUI, using a signal leakage criterion. The proposed algorithm could utilize TDD MIMO channel reciprocity, and thus did not require users＇ feedback information. The algorithm had been simulated in a multi-user TDD MIMO system composed of urban micro-cells. Simulation results show that, the proposed algorithm can effectively improve system capacity and user＇s average SINR.