相关Nakagami信道下信道估计器对RAKE接收机性能影响研究  

Study on Influence of Estimator to Performamce of RAKE Receiver in Correlated Nakagami Channel

作　　者：林云[1] 

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《通信技术》2009年第2期39-41,共3页Communications Technology

基　　金：国家自然科学基金资助(60572089);国家自然科学基金-中物院NSAF联合基金项目(10776040)的资助;重庆市自然科学基金资助CSTC2006BB2359。

摘　　要：在实际环境中RAKE接收机在接收信号时都要进行信道系数估计,以便进行相干合并。文章研究了不采用导频信号与采用导频信号两种估计器,具有估计误差情况下,在相关Nakagami信道下的RAKE接收机的性能,并且通过特征函数法得到了误码率公式的闭合表达式。比较了两种估计器对系统性能的影响,最后给出了数值结果,可以看出,当导频信号能量与信号能量相等,且导频数目比较多时(大于5),采用导频信号的系统性能优于直接估计信道系数的系统。直接估计信道系数的系统性能在信噪比大于5dB后,其性能远远优于导频信号的估计系统。The RAKE receiver has to estimate the channel coefficients in practical environment. In this paper, the performance of RAKE receiver in Nakagami correlated channel is analyzed when weight errors occur in pliot or correlated estimator. Simultaneously, a close error rate probability expression is obtained through characteristic functions, the effects of these two estimator on the system performance are compared. Finally, the numerical results are given. It is shown that the pilot receiver performance surpasses the direct estimated channel gain receiver when the pilot energies are equal to the signal energies and the pilot symbols are more than five. The direct estimated channel gain receiver performance obviously surpasses the pilot receiver performance when the SNR is more than 5dB.

关 键 词：RAKE接收机 相关Nakagami信道 分集 信道估计器 

分 类 号：TN91[电子电信—通信与信息系统]