【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。更多还原

【Abstract】 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=10-4.更多还原