基于后验概率估计的软输出MMSE MIMO排序串行干扰抵消检测算法  

A posteriori probability based soft-output MMSE MIMO ordering sequential interference cancellation detection

作　　者：王军[1] 王振伟[1] 李少谦[1] 

机构地区：[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611731

出　　处：《电路与系统学报》2010年第2期59-65,共7页Journal of Circuits and Systems

基　　金："863"课题(2009AA011801;2009AA012002);"973"课题(2009CB320405);国家重大专项课题(2008ZX03005-001;2009ZX03007-004;2009ZX03005-002;2009ZX03005-004);国家基础科研项目(A1420080150)

摘　　要：该文研究了信道编码无线MIMO通信系统中的软输出MMSE排序串行干扰抵消检测算法。利用MMSE滤波器输出的高斯近似表示,提出了基于后验概率估计的判决误差传播抑制算法,以提高检测算法输出的编码比特对数似然比的可靠性;利用检测器的矩阵结构和矩阵求逆引理,进一步提出了降低复杂度的实现方法。仿真结果表明:提出的检测算法优于现有算法,当BER为10-4,在所给的仿真条件下有1～3dB的性能增益。For channel coded wireless multiple-input multiple-output （MIMO） communication systems, soft-output minimum mean square error （MMSE） ordering sequential interference cancellation （OSIC） detection is investigated in this paper. By Gaussian approximation of the output of MMSE filter, a posteriori symbol probability estimation based scheme is proposed to suppress the impact of error propagation due to imperfect interference cancellation so that the reliability of the log-likelihood ratio of each coded bit can be improved. According to the matrix structure of the detector, complexity-reduced implementation is also proposed by utilizing the matrix inverse lemma. The results show that the proposed detector outperforms the existing detectors with gains of 1-3dB at BER=104.

关 键 词：MIMO MMSE 排序串行干扰抵消 复杂度 

分 类 号：TN92[电子电信—通信与信息系统]