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电子学报  2013 

MMSE准则下近似最优MIMO分组并行检测算法

DOI: 10.3969/j.issn.0372-2112.2013.10.002, PP. 1881-1887

Keywords: 多输入多输出系统,最小均方误差,信道分组,并行检测,格归约,正交幅度调制(QAM)

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Abstract:

在采用多天线高阶QAM的MIMO通信系统中,现有基于信道分组并行检测算法虽然接近最优检测性能但以牺牲计算效率为代价.针对这一问题,本文提出一种MMSE准则下基于信道分组的并行检测算法,不但有效降低计算复杂度,而且仍保证检测性能.该算法采用MMSE准则下格归约算法改进分组后条件较好子信道矩阵特性,并在消除参考信号基础上利用改进的子信道矩阵对剩余信号以非线性方式进行检测.仿真结果表明:对4×4和6×6MIMO系统,该算法检测性能达到最优,对于8×8MIMO系统,比最优算法所需信噪比提高约1dB.复杂度分析表明:相比现有信道分组检测算法,相同检测性能下该算法在6×6MIMO系统中复杂度降低90%以上,在8×8MIMO系统中复杂度降低98%以上.

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