数据采集与处理Issue(4)：881-887,7.DOI:10.16337/j.1004-9037.2015.04.021
多小区M IM O系统中的迫零型预编码方法
Zero-Forcing Precoding Methods for Multi-Cell MIMO Systems
摘要
Abstract
To suppress the co‐channel interference in downlink multi‐cell systems ,a novel zero‐forcing (ZF) precoding method is proposed based on the principle of orthogonal projection in linear algebra .A joint interference channel matrix is constructed ,and then the channel matrix of the target user is projec‐ted onto the null space of the joint matrix .Hence ,the precoding matrix of the target user lies in the null space of all interference users without interfering with others .Compared with the conventional ZF meth‐od ,the projection‐based method performs better at low signal to noise ratio (SNR) .However ,it is infe‐rior to the conventional one at high SNR .Therefore ,an adaptive ZF method is proposed combining the traits of both the conventional method and the projection‐based one .The computational complexities of the proposed methods are analyzed and compared with the conventional one .Simulation results show that the proposed adaptive ZF method offers better performance than the conventional one over a whole SNR region ,and the complexity of the proposed method is a little higher than that of the conventional one .关键词
多输入多输出系统/多小区/预编码/迫零型Key words
MIMO systems/multi-cell/precoding/zero-forcing (ZF)分类
信息技术与安全科学引用本文复制引用
周雯,张胜利..多小区M IM O系统中的迫零型预编码方法[J].数据采集与处理,2015,(4):881-887,7.基金项目
广东省高等学校学科与专业建设专项资金（2012LYM＿0064）项目资助；广东省自然科学基金（S2012040006342）项目资助；汕头大学国家基金培育（NFC14001）资助项目；深圳市基础研究（JC201005250034A）项目资助。 （）
