通信学报 ›› 2014, Vol. 35 ›› Issue (9): 156-163.doi: 10.3969/j.issn.1000-436x.2014.09.016

• 论文Ⅱ • 上一篇    下一篇

基于空间投影的全双工MIMO中继站自反馈干扰抑制

杨吉松,刘皓,孙辰   

  1. 电子科技大学 通信抗干扰技术国家级重点实验室,四川 成都 610000
  • 出版日期:2014-09-25 发布日期:2017-06-14
  • 基金资助:
    国家重大专项基金资助项目

Loop interference suppression based on space projection in full-duplex MIMO relays

Ji-song YANG,Hao LIU,Chen SUN   

  1. National Key Laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China,Chengdu 610000,China
  • Online:2014-09-25 Published:2017-06-14
  • Supported by:
    The National Special Science and Technology Project of China

摘要:

建立由基站、全双工MIMO中继站和用户站组成的系统模型,获得MIMO自反馈干扰矩阵。当自反馈干扰信号最大多径时延大于符号周期时,根据自反馈干扰矩阵张成空间,设计并添加信号空间投影滤波器到中继站中实现自反馈干扰抑制。针对自反馈干扰矩阵是否满秩,滤波器设计分别采用子空间和零空间投影算法,并讨论了不同投影算法下对中继站接收信号误码率影响和自干扰信号的残留量。理论分析和仿真结果表明,所提出的空间投影算法对自反馈干扰的抑制有较理想的效果。

关键词: 自反馈干扰抑制, 全双工MIMO中继站, 子空间投影, 零空间投影

Abstract:

The system model including base station,full duplex MIMO relay and user station was established,and then obtained the loop interference matrix.While the case that loop interference signal's maximum multipath delay was greater than the symbol period was taken into account,signal space projection filters were designed to suppress the loop interference according to the space expanded by loop feedback interference matrix.Confronted the loop interference ma-trix full rank or not,filter design was based on subspace projection or null space projection algorithm.It was discussed that the projection algorithm how to influence the residual interference signal and the bit error rate of the relay station.Theoretical analysis and simulation results prove that the proposed space projection algorithm has ideal effect on sup-pressing loop interference.

Key words: loop interference suppression, full-duplex MIMO relays, subspace projection, null space projection

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