基于TD-LTE中下行MIMO技术的信号检测算法

Downlink MIMO signal detection algorithms based on TD-LTE

MIMO技术是LTE系统中的一个关键技术。在实际应用中,下行MIMO信号检测算法的选用需要在计算复杂度和系统性能之间取得合理的折中。文中对几种传统的检测算法—ML、MMSE、最优排序的SIC算法、QR分解算法、循环迭代QR分解算法进行了分析与研究。经仿真表明,除最大似然算法,循环迭代QR分解算法在这几种算法中性能是最好的。但是从计算复杂度出发,循环迭代QR分解算法远优于最大似然算法。所以,选用循环迭代QR分解算法运用于TD-LTE无线综合测试仪。

MIMO is a key technology of LTE system.The selection of downlink MIMO signal detection algorithms needs to strike a reasonable balance between the computational complexity and the system performance in real application.Several traditional detection algorithms,such as ML,MMSE,MMSE-OSIC,QR decomposition and iterative cyclic QR decomposition algorithm,are analyzed and studied in this paper.Simulation results show that iterative cyclic QR decomposition detection algorithm is superior to the other algorithms except ML algorithm. However,iterative cyclic QR decomposition algorithm is better than ML from the angle of computational complexity. Therefore,iterative cyclic QR decomposition algorithm is applied to TD-LTE Wireless Integrated Test Set.