空时编码调制中信道估计误差的Cramer-Rao界  

Cramer-Rao bound for channel estimation errors in space-time coding and modulation

作　　者：康桂华[1] 仇佩亮[1] 

机构地区：[1]浙江大学信息与电子工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2004年第4期457-460,共4页Journal of Zhejiang University：Engineering Science

摘　　要：根据一般的空时编码调制理论和信道估计误差的统计特征,构造了一种信道参数估计误差的分析模型,据此模型,推导出了此误差的Cramer-Rao界,同时证明了它是一个一般界和紧界.利用蒙特卡洛方法仿真了采用空时分组编码调制的多天线系统以及当信道参数存在估计误差时系统的误码性能.结果表明,在该Cramer-Rao界上得到的仿真结果是所有信道参数估计误差引起系统性能损失值中的最小值,这与理论分析结果是一致的.A simple model for analysing channel estimation errors in space-time coding and modulation was constructed, and the Cramer-Rao bound expression for channel estimation errors was derived. It was proved that the proposed Cramer-Rao bound was a general and tight bound, compared with the one given in the reported results of channel estimation errors. Moreover, the influence of channel estimation errors on the bit-error performance of space-time block coding and modulation was simulated by Monte Carlo method, the simulation results show that the losses of the performance caused by the channel estimation errors within the above Cramer-Rao boundary are the minima in the losses of bit-error performance caused by all the channel estimation errors. This conclusion accorded with the analytical result in theory.

关 键 词：CRAMER-RAO界 信道估计 空时编码 发射分集 无线传输 信道估计误差 

分 类 号：TN911.2[电子电信—通信与信息系统]