J4 ›› 2015, Vol. 42 ›› Issue (5): 139-146.doi: 10.3969/j.issn.1001-2400.2015.05.024

• 研究论文 • 上一篇    下一篇

符号间干扰信道的迭代均衡合成算法

乔良;郑辉   

  1. (盲信号处理重点实验室, 四川 成都  610041)
  • 收稿日期:2014-05-20 出版日期:2015-10-20 发布日期:2015-12-03
  • 通讯作者: 乔良
  • 作者简介:乔良(1984-),男,盲信号处理重点实验室博士研究生,E-mail: lqiao57s@163.com.
  • 基金资助:

    国家自然科学基金资助项目(61172140)

Iterative equalization combining algorithm in intersymbol interference channel

QIAO Liang;ZHENG Hui   

  1. (National Key Lab. of Science and Technology on Blind Signal Processing, Chengdu  610041, China)
  • Received:2014-05-20 Online:2015-10-20 Published:2015-12-03
  • Contact: QIAO Liang

摘要:

针对符号间干扰信道的多天线分集接收问题,提出了一种迭代均衡合成算法.该算法不需要借助复杂的信噪比估计方法,而是直接利用分集支路迭代均衡的相关参数计算合成权值,以进行均衡符号的合成;并将译码输出的外信息反馈至分集支路,在译码器和支路均衡器之间迭代交换软信息.外信息传递图分析和计算机仿真结果均表明,所提算法充分利用了多径时域信息和多天线空域信息,能够有效提升接收系统抗严重符号间干扰的能力.

关键词: 空间分集, Turbo均衡, 符号间干扰, 外信息传递图

Abstract:

To realize joint optimization of spatial diversity and equalization combining in the intersymbol interference (ISI) channel, an iterative equalization combining algorithm is proposed. The proposed algorithm uses the coefficients of Turbo equalization to calculate the combination weights without estimating the signal to noise ratio in each diversity branch. The equalized symbols from different diversity branches are combined, and the extrinsic information output from the decoder is fed back to the equalizers, so as to exchange soft information between the equalizers and the decoder. The performance of the proposed algorithm is analyzed using the extrinsic information transfer (EXIT) chart and verified by simulations. Results show that our approach fully exploits time domain information from the multipath channel and spatial domain information from multi receiving antennas, which efficiently improve the performance of the receiver in the severe ISI channel.

Key words: spatial diversity, Turbo equalization, intersymbol interference, extrinsic information transfer(EXIT) chart

中图分类号: 

  • TN911.5