基于排序的增强球形空时码译码算法  

Ordering-based enhanced sphere decoding algorithm of space-time code

作　　者：朱容波[1] 李杰[2] 

机构地区：[1]中南民族大学计算机科学学院,武汉430074 [2]上海交通大学电子工程系,上海200240

出　　处：《计算机应用》2008年第3期579-581,585,共4页journal of Computer Applications

基　　金：中南民族大学自然科学基金重点项目(YZZ07006)

摘　　要：球形译码利用空间复用可以显著提高频谱效率,但现有的球形译码仅能处理整数实星座图信号或某些特殊的复星座图信号。为了适合复星座图信号,提出了增强的球形译码算法排序(OSD),以处理任意形状的星座图信号。通过将候选项按照信道状态信息(CSI)大小对译码次序进行排序,加入启发式规则,使OSD译码算法达到最大似然译码的性能。仿真实验表明,该算法大大降低了计算复杂度与译码时间。与已知的复信号检测算法比较,提出的OSD算法速度更快,准确度更高。With spatial multiplexing, sphere decoder can markedly improve the spectrum efficiency. However, the existing sphere decoders can only tackle the real constellation and some special complex constellations. In order to process the constellation with any shape, an enhanced sphere detector called Ordered Sphere Decoding （OSD） was proposed. By ordering candidate Channel State Information （CSI） and adding heuristic rules, the proposed algorithm can obtain near Maximum Likelihood （ML） performance. Detailed simulation results show that the proposed algorithm greatly decreases computation complexity and decoding time, Compared with other known methods to solve complex constellation, the proposed algorithm OSD is both faster and more accurate.

关 键 词：球形码 空间复用 排序 格形码 

分 类 号：TP393.04[自动化与计算机技术—计算机应用技术] TN911.6[自动化与计算机技术—计算机科学与技术]