一种新颖的两天线差分空时分组编码方案  

A New Differential Space-Time Block Coding Scheme with Two Transmit Antennas

作　　者：李伟[1] 王宏霞[1] 张玉卫[1] 

机构地区：[1]西南交通大学信息安全与国家计算网格实验室,四川成都610031

出　　处：《通信技术》2007年第11期68-70,共3页Communications Technology

基　　金：四川省青年科技基金资助项目(编号:07ZQ026-004);西南交通大学发展基金资助项目(编号:2006A04)

摘　　要：传统的差分空时分组编码(DSTBC)在QPSK调制时存在着信号星座扩展。文中提出了一种在QPSK调制下新颖的两发射天线差分空时分组编码方案,此方案提供了一定的编码增益,同时也解决了星座扩展问题。在新方案中,改进了从信息块到系数矢量的映射,从而使其性能与相干空时分组编码相比大约只差1dB。同时新方案编码相对简单,在接收端也具有低的解码复杂度。The traditional differential space-time block code （DSTBC） suffers from the signal constellation expansion for QPSK modulation. In this paper, a new differential space-time block code for QPSK modulation with two transmit antennas is proposed, which can offer a differential coding gain without constellation expansion. In this scheme, the mapping from the information blocks to the coefficient vectors is improved. As a result, the performance is only about ldB away from the coherent STBC. The new encoding isrelatively simple, and decoding is achieved with low decoding complexity at the receiver.

关 键 词：发射分集 差分检测 差分空时分组编码 星座扩展 

分 类 号：TN911.22[电子电信—通信与信息系统]