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计算机工程

• 移动互联与通信技术 • 上一篇    下一篇

提升MIMO 干扰信道容量的干扰对齐方案

宋林中,赵 宇,马永涛   

  1. (天津大学电子信息工程学院,天津300072)
  • 收稿日期:2013-11-08 出版日期:2014-11-15 发布日期:2014-11-13
  • 作者简介:宋林中(1989 - ),男,硕士研究生,主研方向:无线通信,干扰对齐;赵 宇,副教授;马永涛,博士。

Interference Alignment Scheme for Capacity Improvement of MIMO Interference Channel

SONG Linzhong,ZHAO Yu,MA Yongtao   

  1. (School of Electronic Information Engineering,Tianjin University,Tianjin 300072,China)
  • Received:2013-11-08 Online:2014-11-15 Published:2014-11-13

摘要:

为提高多用户MIMO 干扰信道的容量,提出一种干扰对齐方案。在假设已有天线配置情况不变的条件下,将发送端的原有天线划分为数目相当的2 个子组,分别设置不同的天线参数,以消除2 个子组天线之间的相关性,从而形成2 组独立的传输信道。在接收端将经由2 组子信道传输后的接收信号进行合并,间接扩展信号空间维数。基于合并处理后的等效信道传输矩阵,分别利用优化预编码向量夹角和正交投影的方法求解预编码矩阵与联合矩阵,以减少已有干扰对齐方案通过迭代求解所需的运算量。仿真结果表明,在总天线配置情况不变时,该方案可以提高多用户MIMO 信道的抗干扰能力。

关键词: 多输入多输出, 干扰信道, 干扰对齐, 信道容量, 正交投影, 自由度

Abstract:

A new interference alignment method is proposed to improve the channel capacity of the multi-user Multiple Input Multiple-Output(MIMO) channel. Based upon the assumption that the antenna configuration is unchangeable,the antennas at transmit node are divided into two parts and with differentiated parameters,it conduces to eliminate the correlation between the two subparts and contributes to form two independent sub-channels. The signals received are consolidated to extend the dimensions of the signal space. According to the equivalent channel transmission matrixes,the pre-coding matrices and combining matrices are separately designed by optimizing the angle between the pre-coding vectors and using orthogonal projection method. The new scheme can reduce the computation pervasively existed in the previous iterative algorithms. Simulation indicates that the proposed method can effectively promote the anti-interference ability of the MIMO channel with the unchanged antenna configuration.

Key words: Multiple-Input Multiple-Output(MIMO), interference channel, interference alignment, channel capacity, orthogonal projection, Degree of Freedom(DoF)

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