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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 .所用的分析方法可以推广到其他的信号星座
Space-time coding is a very promising technology to realize broadband wireless data communication.This paper studies a simple but effective space-time trellis code design scheme --- generalized delay diversity code, which can be considered as repetition code and multi And the delay factor between the transmitting antennas, and the idea of generalized delay diversity codes is to replace the repetitive codes in ordinary delay diversity with some simple block codes to improve the coding gain.In this paper, the generalized delayed diversity codes Completely Diverse Sufficient and Necessary Conditions, and then prove that Fully Diversified Generalized Delay Diversified Code is the least-complex fully space-time space-time trellis code. For generalized delay-diversity codes on binary phase shift keying (BPSK) signal constellations, They have the same coding gain. For generalized delay diversity codes on the QPSK signal constellation, this paper analyzes their coding gain and gives the optimal coding scheme.The analysis method can be extended to Other signal constellations