时变多径MIMO信道中一种带自适应信道追踪的序列检测方法  

A Sequence Detection Method with Adaptive Channel Tracking in Time-varying Multipath MIMO Channels

作　　者：景小荣[1] 周正中[1] 徐征[2] 

机构地区：[1]电子科技大学通信与信息工程学院,成都610054 [2]华东交通大学电气与电子工程学院,南昌330013

出　　处：《电子与信息学报》2009年第8期1930-1934,共5页Journal of Electronics & Information Technology

摘　　要：该文针对时变多径MIMO信道，各MISO子系统首先分别采用混合MLSE（H—MLSE）处理，然后结合Г-幸存状态选择，提出了一种复杂度可控的、带自适应信道追踪的序列检测方法。与传统的MLSE算法相比，该方法具有3个显著特征：通过参数选择，可实现对算法复杂度的可控调节；通过嵌入的判决导向/LMS（DD／LMS）算法，对各幸存状态转移对应的幸存路径上的信道参数可实现接近零时延追踪；可部分采用并行处理技术来实现。对具有两条多径的2X4 MIMO时变信道通过数值仿真表明：当Г-≥2时，该方法可获得满意的检测性能。Adopting the hybrid MLSE （H-MLSE） on each MISO subsystem firstly, and then combining the Г-selection of survival states, a complexity-controllable sequence detention method with adaptive channel tracking is proposed for Multi-Input Multi-Output （MIMO） time-varying multipath channels. In contrast to the conventional MLSE, the proposed method has three features： （1） the adjustable computational complexity, which can be achieved by adjusting the parameter; （2） the on-line channel tracking with near zero-delay, which is embedded in the scheme and accomplished for each selected survival state transition along the corresponding path by decision-directed/LMS algorithm （DD/LMS）; （3） It can be partly implemented by parallel processing technology. The simulation results show the proposed method can achieve the satisfactory detection performance for 2X4 time-varying MIMO channel with two multipaths when Г ≥ 2.

关 键 词：MIMO系统 Г--幸存状态选择 时变多径信道 

分 类 号：TN92[电子电信—通信与信息系统]