基于循环平稳特性的OFDM盲信道估计算法  

Cyclostationarity-based Blind Channel Estimation Algorithm for OFDM System

作　　者：朱文升[1] 李有明[1] 俞建定[1] 陈征[1] 

机构地区：[1]宁波大学通信技术研究所,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2010年第4期62-66,共5页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：国家自然科学基金(60772126;60672070);浙江省自然科学基金(Y1091155);国际合作项目(2009DFA12120)

摘　　要：准确的信道估计是无线通信可靠传输的关键技术之一,因此提出一种基于OFDM信号循环平稳特性的单k盲信道估计算法.该类算法无须改变循环频率,而是利用延迟变量的z变换中2个相关值来估计信道,并采用部分频谱信息提出的简化算法可进一步减小运算量.计算机仿真结果验证:单k盲信道估计算法性能明显优于双k算法,而简化的单k算法虽然在高信噪比时性能有所下降,但算法复杂度却大大降低了.Accurate channel estimation is one of the key factors for wireless communication transmission.A novel one-cycle blind channel estimation algorithm is proposed based on cyclostationarity properties of OFDM signal.Without changing cycle frequency,the new algorithm is formed using the two related z-transform values of delay parameter,and a simplified algorithm based on partial spectrum information can further reduce computational complexity.Computer simulation results indicate that the performance of the proposed one-cycle algorithm is superior to that of the two-cycle algorithm.Although the performance optimality is compromised in the simplified one-cycle algorithm in high SNR region,its computational complexity is significantly reduced.

关 键 词：OFDM 循环平稳特性 循环频率 盲信道估计 

分 类 号：TN92[电子电信—通信与信息系统]