非理想信道估计垂直分层空时码差错性能分析  

Performance Analysis of V-BLAST System with Channel Estimation Errors

作　　者：刘海涛[1] 杜超[1] 李冬霞[1] 

机构地区：[1]中国民航大学天津市智能信号与图像处理重点实验室,天津东丽区300300

出　　处：《电子科技大学学报》2010年第5期696-700,共5页Journal of University of Electronic Science and Technology of China

基　　金：天津市自然科学基金(09JCYBJC00600)

摘　　要：推导出了高斯信道估计下,垂直分层空时码系统最大似然接收机成对差错概率的精确及高信噪比近似计算公式;并以高信噪比近似计算公式为基础,研究了信道估计误差对垂直分层空时码最大似然接收机分集增益及信噪比的影响。理论分析表明:当信道估计的方差等于信噪比倒数时,信道估计误差不改变垂直分层空时码最大似然接收机所获得的分集增益,而信道估计误差造成信噪比损失为3dB。计算机蒙特卡洛仿真试验验证了理论分析的正确性。In this paper,the impact of Gaussian estimation error on the performance of vertical bell labs layered space-time（V-BLAST） architecture is investigated by using maximum likelihood（ML） receiver in independently and identically distributed（i.i.d.） Rayleigh fading channel.Based on the statistical property of squared Euclidean distance,the pairwise error probability（PEP） for V-BLAST system over i.i.d.Rayleigh fading channel with channel estimate error is derived.The approximate expression of the PEP for high signal-to-noise ration（SNR） region is used to analyze the loss of diversity order and penalty of SNR.It shows that the diversity order achieved by ML receiver is not affected by channel estimation error and the loss of SNR due to imperfect channel estimation is 3 dB.Simulation results are given to corroborate the theoretical analysis.

关 键 词：信道估计误差 多天线系统 成对差错概率 垂直分层空时码 

分 类 号：TN929.5[电子电信—通信与信息系统]