CDMA时变色散信道的快速半盲辨识方法  

A Fast Algorithm for Semi-Blind Identification for CDMA Time-varying Dispersive Channels

作　　者：吴波[1] 易勇[1] 蒋世奇[1] 古天祥[1] 

机构地区：[1]电子科技大学自动化工程学院,成都610054

出　　处：《信号处理》2007年第3期441-443,共3页Journal of Signal Processing

摘　　要：利用CDMA时变色散信道的离散正则模型,给出了一种新的信道快速盲辨识算法,首先使用时-频解相关RAKE接收机消除了多址干扰的影响,然后再利用解相关处理后信号的一阶统计量,实现对信道的辨识。和基于二阶统计量以及高阶统计量的盲辨识算法相比,该算法仅需要少量的导频符号,就可实现对信道的估计,具有更低的计算复杂度和更好的抗噪性能。仿真结果证明了算法的有效性。A new semi-blind identification algorithm was proposed based on the discrete-time canonical model for CDMA time-varying dispersive channels. The channel is identified with the first-order statistics of the time-frequency decorrrelating Rake receiver output. The algorithm takes advantage of pilot symbols, it has lower complexity of computation and more effective under the condition of the low SNR than that of usual blind identification algorithms. Simulations are presented.

关 键 词：CDMA时变色散信道 基展开模型 离散正则模型 盲辨识 时一频解相关RAKE接收机 

分 类 号：TN929.533[电子电信—通信与信息系统]