存在循环频率误差时的盲自适应波束形成  

Blind Adaptive Beam Forming with Cyclic Frequency Error

作　　者：范达[1] 吴瑛[1] 张莉[1] 

机构地区：[1]信息工程大学信息工程学院,郑州450002

出　　处：《现代雷达》2003年第5期40-43,共4页Modern Radar

摘　　要：绝大多数通信信号都具有循环平稳特性 ,利用信号的循环平稳特性可以进行真正的盲自适应波束形成 ,例如CAB类算法以及基于特征空间的盲波束形成算法〔3〕。但当循环频率存在误差时 ,上述算法的性能将急剧下降。本文提出一种改进算法 ,在估计循环相关矩阵时引入遗忘因子可以大大降低算法对循环频率误差的敏感性 。Most man made communication signals are cyclostationary. The blind beam forming algorithms using cyclostationary signal properties are the genuine blind algorithms, such as CAB algorithm and eigenspace-based blind beam former 〔3〕 . But all the algorithms' performance will severely degrade when CFE (cyclic frequency error) exists. An improved algorithm is presented in the paper, in which adopting forgetting factor in estimation cyclic correlation matrix would largely depress the sensitivity of CAB to cyclic frequency error and the algorithm has excellent performance under little cyclic frequency error. Computer simulations verify the effect of the theoretical analysis.

关 键 词：循环频率误差 循环平稳 盲自适应波束形成 遗忘因子 特征空间 

分 类 号：TN911[电子电信—通信与信息系统]