MIMO空间复用系统中的一种新的低复杂度球形检测算法  

Novel low complexity sphere detection algorithm for MIMO spatial multiplex systems

作　　者：任光亮[1] 段昕利[1] 郁光辉[2] 杨丽花[1] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071 [2]中兴通讯股份有限公司无线预研部,广东深圳518057

出　　处：《西安电子科技大学学报》2011年第2期13-17,共5页Journal of Xidian University

基　　金：国家科技重大专项资助项目(2009ZX03003-005);国家自然科学基金资助项目(60602063)

摘　　要：针对采用高阶正交幅度调制(MQAM)的多输入多输出(MIMO)复用系统,提出一种新的基于分层调制的M IMO球形检测算法.新算法利用高阶正交幅度调制的分层特性,对高阶正交幅度调制的星座点进行区域划分,根据权重系数大的调制子层数据确定候选区域,在候选区域中采用最小距离准则进行星座点优选,再采用球形检测算法对各层优选后的星座点进行搜索,确定发送数据矢量.计算机仿真结果表明,与多状态球形检测(MSD)算法相比,新算法的误码率(BER)性能有所改善,且其复杂度大约仅是MSD的20%.A new hierarchical modulation based sphere detection algorithm（HBSD） is presented for the MIMO（multi-input multi-output） spatial multiplex system with high order modulation.In the algorithm,the constellations of MQAM（M-Quadrature Amplitude Modulation） are divided into many regions by the hierarchical data in MQAM modulation.The candidate regions of the constellations are determined by the hard decision data of the layers with great weight factors in hierarchical modulation.The constellations are selected as the reserved constellations in the candidate regions using the minmum distance rule.SD（Sphere detection） is used to find the optimum transmitted vectors by searching for the reserved constellations in the candidate regions of all detection layers.Simulation results show that the performance of the proposed HBSD algorithm is better than that of the MSD（Multi-SD） algorithm,with its complexity being about one fifth that of the MSD algorithm.

关 键 词：分层调制 球形检测 复杂度 

分 类 号：TN919.72[电子电信—通信与信息系统]