一种简单而有效的空时编码  

A Simple and Powerful Space-Time Coding Scheme

作　　者：李舒[1] 康桂霞[2] 韩承德[1] 张平[2] 陶小峰[2] 

机构地区：[1]中科院计算技术研究所,25分箱北京100080 [2]北京邮电大学,北京1000876

出　　处：《电子学报》2002年第1期94-96,共3页Acta Electronica Sinica

基　　金：国家自然科学基金 (No .698962 50 )

摘　　要：空时编码是实现宽带无线数据通信的一种极有潜力的技术 .本文研究了一种简单而有效的空时格码设计方案———广义延迟分集码 .延迟分集可以认为是重复码与多发射天线之间的延迟因子的组合 ,而广义延迟分集码的思想是将普通的延迟分集中的重复码替换成某些简单的分组码 ,以提高编码增益 .本文给出了广义延迟分集码达到完全分集的充要条件 ,进而证明了完全分集广义延迟分集码是具有最小复杂度的完全分集空时格码 .对于二进制相移键控 (BPSK)信号星座上的广义延迟分集码 ,本文证明了它们具有相同的编码增益 ;对于四相移键控 (QPSK)信号星座上的广义延迟分集码 ,本文分析了它们的编码增益 ,并给出了最优的编码方案 .We consider the design of a simple but powerful space time trellis coding scheme.While delay diversity can be viewed as the combination of repetition code and delay element,GDDC(Generalized Delay Diversity Code) replaces the repetition code with some other simple block code in order to achieve higher coding gain.The necessary and sufficient condition for GDDCs to achieve full diversity advantage is given.It is proved that all the full diversity GDDCs on BPSK(Binary Phase Shift Keying) constellation have the same coding gain.We have also thoroughly studied the coding gain of full diversity GDDCs on QPSK (Quadriphase Shift Keying) constellation and the optimal GDDC is given.The strategy can also be applied to the analysis of the coding gain of full diversity GDDCs defined on other constellations.

关 键 词：数据通信 空时编码 延迟分集 

分 类 号：TN919[电子电信—通信与信息系统] TN911.2[电子电信—信息与通信工程]