空间相关信道下酉空时系统的最大似然多符号差分检测算法  

Maximum-Likelihood Multiple Symbol Differential Detection for Unitary Space-Time Modulation in Spatial Correlated Channels

作　　者：蓝兴[1] 马东堂[1] 魏急波[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《电子学报》2009年第9期1926-1930,共5页Acta Electronica Sinica

摘　　要：传统的酉空时系统,通常假设信道衰落系数之间相互独立,这个条件在实际系统中却很难满足,天线之间的空间相关性造成系统性能恶化.针对该问题,本文提出了空间相关信道下酉统空时系的最大似然多符号差分检测算法.本算法只需获取每个观测窗口的第一个符号,以该符号为导频符号,其传输效率渐近为1,并且不要求系统具有反馈信道,算法中最大似然解的快速搜索可以通过球形译码来实现.计算机仿真结果表明:本算法可以在不明显增加开销的情况下,有效的提高空间相关信道下酉空时系统的误码率性能.The traditional unitary space-time modulation system is generally based on the assumption of independent and identically distributed channel coefficients.However,this condition is hard to satisfy in practice,the spatial correlation among antennas deteriorates the performance.This paper proposed a maximum-likelihood multiple-symbol differential-detection algorithm for unitary space-time system with spatial correlation.By using the first symbol of every observation window as pilot symbols,the transmit efficiency approximates to 1. Moreover, the proposed algorithm does not require the feedback channel. The fast search for the maximum-likelihood solution can be done by sphere decoding aligorthm. Simulation results show that our scheme can improve the bit error rate performance effectively in spatial correlated channels with a small cost.

关 键 词：空间相关 酉空时调制 多符号差分检测 

分 类 号：TN911[电子电信—通信与信息系统]