抑制小区间干扰的改进信漏噪比预编码方法

A Modified Signal-to-leakage Plus-noise Ratio Precoding Scheme with Other-cell Interference Suppression

针对下行多用户MIMO系统在多小区环境中系统性能下降的问题,在传统信漏噪比(SLNR)预编码基础上,提出在接收端采用白化滤波器抑制干扰,发射端考虑邻小区干扰加噪声协方差矩阵的预编码方法,消除用户间干扰的同时能很好地抑制小区间干扰,改善系统性能。仿真结果表明,改进算法在最大化新定义的等效信漏噪比的过程中,由于引入的等效信道考虑了小区间干扰,相对于传统算法,可明显提高系统容量。

The traditional signal-to-leakage plus-noise ratio（SLNR） based preceding scheme for downlink multi- user MIMO suffers from the performance loss due to the neglect of OCI （other-cell interference） in the multi-cell scenario. This paper presents an enhancement to the SLNR that uses interference suppression at the receiver and a novel precoder using the other-cell interference covariance information at the transmitter. For the broadcast channel, the proposed scheme eliminates the interference among users, while suppressing OCI as well. The sim- ulation results show that the enhancement can significantly improve the system capacity by the use of effective channel while maximizing the defined effective SLNR.