北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2013, Vol. 36 ›› Issue (5): 41-45.doi: 10.13190/j.jbupt.2013.05.009

• 论文 • 上一篇    下一篇

低复杂度信道矩阵排序的MIMO固定复杂度球译码

王世良, 孙松林, 景晓军, 黄海   

  1. 北京邮电大学 信息与通信工程学院, 北京 100876
  • 收稿日期:2012-12-18 出版日期:2013-10-31 发布日期:2013-08-09
  • 作者简介:王世良(1985-),男,博士,E-mail:wangslzxr@gmail.com;景晓军(1965-),男,教授,博士生导师.
  • 基金资助:

    中央高校基本科研业务费专项资金项目;国家高技术研究发展计划项目(2011AA01A204)

MIMO Fixed-Complexity Sphere Decoding with Low-Complexity Channel Matrix Ordering

WANG Shi-liang, SUN Song-lin, JING Xiao-jun, HUANG Hai   

  1. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2012-12-18 Online:2013-10-31 Published:2013-08-09

摘要:

提出了一种多输入多输出通信系统中,根据最小均方误差(MMSE)译码器判决变量的可靠性进行信道矩阵排序的固定复杂度球译码(FSD)算法。首先进行MMSE译码,然后计算MMSE判决变量的可靠性,并将其作为信道矩阵排序的依据。该排序算法不仅能够有效降低传统FSD预处理阶段的复杂度,而且避免了FSD预处理阶段的串行特性,使得排序依据可并行计算,显著改善了译码实时性。仿真结果表明,低复杂度排序算法引起的性能损失很小,误符号率仍能接近最大似然译码。

关键词: 多输入多输出, 球译码, 固定复杂度球译码

Abstract:

A multiple-input multiple-output fixed-complexity sphere decoder (FSD) with low-complexity channel matrix ordering is proposed based on reliabilities of the minimum mean square error (MMSE) decoder's decision variables. The proposed ordering algorithm first performs MMSE decoding, computes the reliabilities of MMSE decoder's decision variables, and finally orders channel matrix based on the reliabilities. The algorithm not only effectively reduces the complexity of FSD in preprocessing stage, but also overcomes its sequential nature, more suitable for applications. Simulation result shows that the performance loss caused by the low-complexity ordering algorithm is negligible and quasi-maximum likelihood performance can be achieved.

Key words: multi-input multi-output, sphere decoding, fixed-complexity sphere decoding

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