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抑制小区间干扰的改进信漏噪比预编码方法
范慧婧,孙长印,卢光跃
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(西安邮电大学通信与信息工程学院，西安 710061)

摘要:

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。

关键词: 多用户MIMO 多小区 SLNR预编码干扰抑制

DOI：

基金项目:国家自然科学基金资助项目(61102047)；教育部新世纪优秀人才支持计划（NCET-08-0891）；陕西省教育厅自然科学基金项目（11JK1021）

A modified signal-to-leakage plus-noise ratio precoding scheme with other-cell interference suppression

FAN Hui-jing,SUN Chang-yin,LU Guang-yue

(School of Communication and Information Engineering, Xi′an University of Posts and Telecommunications, Xi′an 710061, China)

Abstract:

The traditional signaltoleakage plusnoise ratio（SLNR） based precoding sc heme for downlink multiuser MI MO suffers from the performance loss due to the neglect of OCI (othercell inte r ference) in the multicell scenario. This paper presents an enhancement to the S LNR that uses interference suppression at the receiver and a novel precoder usin g the othercell interference covariance information at the transmitter. For th e broadcast channel, the proposed scheme eliminates the interference among users, while suppressing OCI as well. The simulation results show that the enhancement can significantly improve the system capacity by the use of effective channel wh ile maximizing the defined effective SLNR.

Key words: MU-MIMO multi-cell SLNR pre-coding interference suppression