基于可靠性的低复杂度最小均方误差软干扰抵消MIMO Turbo接收机  

Reliability Based Reduced-complexity MMSE Soft Interference Cancellation MIMO Turbo Receiver

作　　者：王军[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,成都610054

出　　处：《信号处理》2009年第1期28-33,共6页Journal of Signal Processing

基　　金：自然科学基金资助项目(No.60572090;60496313;60472045;60602009;60702073);"863"项目(No.2007AA01Z209)。

摘　　要：计算复杂度高是MIMO最小均方误差软干扰抵消Turbo接收机面临的主要问题。一种方案提出在迭代检测阶段采用匹配滤波器取代最小均方误差滤波器,以避免矩阵求逆,但会导致性能显著下降。为了克服这一缺点,本文提出一种基于先验信息可靠性的低复杂度最小均方误差软干扰抵消Turbo接收机方案。该方案根据先验信息的可靠性动态选择最小均方误差和匹配滤波检测,从而在显著降低系统复杂度的同时使得引入的性能损失可以忽略不计。同时,通过合理设置选择门限,该方案还可以灵活地在复杂度和性能之间进行折中。High computational complexity is the main problem of the minimum mean square error （MMSE） soft interference cancellation （SIC） based multiple-input multiple-output （MIMO） Turbo receiver. One method is proposed to replace the MMSE filter by match filter at iteration stages so that the matrix inverse can be avoided. However, significant performance loss is introduced. To overcome this drawback, a new reduced-complexity MMSE SIC MIMO turbo receiver is proposed based on the reliability of the a pr/or/information. In this new proposal, MMSE is replaced by MF only when the reliability of the a priori information is larger than a specific threshold. As this new proposal takes the reliability of the a priori information into account, it can reduce the computation complexity at the cost of negligible performance loss. Meanwhile,it is very flexible for this proposal to make a tradeoff between the performance and the computational complexity through changing the threshold of reliability.

关 键 词：多人多出 最小均方误差 软干扰抵消 计算复杂度 TURBO接收机 

分 类 号：TN92[电子电信—通信与信息系统]