存在信道估计误差的DSTTD系统的性能分析  

Performance Analysis of DSTTD System with Channel Estimation Error

作　　者：吴玉成[1] 陈丽容[1] 

机构地区：[1]重庆大学通信工程学院,重庆400044

出　　处：《华南理工大学学报（自然科学版）》2010年第10期52-56,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60872038);中国博士后科学基金资助项目(20090450787);重庆市教委科技项目(KJ08A09)

摘　　要：现有的双空时传输分集(DSTTD)系统研究主要基于完全信道估计,且信道估计总存在误差.为此,文中采用假定存在估计误差矩阵的分析方法考察信道估计误差对DSTTD系统性能的影响,发现统计判决量中的干扰矩阵是影响系统性能的主要因素,同等估计误差下独立同分布信道比相关衰落信道更能容忍估计偏差.仿真结果表明,不同情形下不同信道估计误差的误差矩阵对系统性能的影响与实际情况一致,从而验证了误差矩阵分析方法的正确性.The existing study of double space-time transmission diversity（DSTTD） system is mainly based on perfect channel estimation.However,in an actual channel estimation,error always exists.In order to reveal the influence of channel estimation error on the performance of DSTTD system,a method based on the existence of an assumed error matrix is proposed.Analytical results indicate that the interference matrix in decision statistics is the main factor influencing the system performance,and that independent and identically-distributed channels are more resistant to estimation bias than the correlated fading channels with the same estimation error.Simulated results show that the system performance affected by the error matrixes of different channel estimations in various scenarios is similar to that in actual situations.Thus,it is concluded that the proposed analysis method based on error matrix is valid and reasonable.

关 键 词：信道估计 多输入多输出系统 双空时传输分集 干扰矩阵 

分 类 号：TN911.23[电子电信—通信与信息系统]