利用二阶循环平稳性的信道自适应盲辨识  

Adaptive blind channel identification using second-order cyclostationarity

作　　者：张伟涛[1] 刘宁[1] 楼顺天[1] 

机构地区：[1]西安电子科技大学电子工程学院,西安710071

出　　处：《振动与冲击》2010年第8期13-16,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金资助课题(60775013)

摘　　要：提出了利用二阶循环平稳性信道盲辨识的自适应求解方法。通过递推更新循环相关函数,从而完成了循环相关矩阵的自适应估计。利用共轭梯度搜索的方法实现信道的自适应盲辨识,并讨论了梯度算法中步长选取的问题,提出了可变步长选取的方法。由于采用二阶循环统计量,因此算法既简单又可以很好的抑制平稳加性有色噪声。计算机仿真表明,在低信噪比情况下,自适应算法能很好的工作。An adaptive blind channel identification algorithm was proposed based on the modulation induced second-order cyclostationarity.The cyclic correlation matrix was updated by means of updating cyclic autocorrelation functions at different time lags.Then the conjugate gradient descent method was used to realize adaptive blind identification of the channel,and the time-varying step size was presented for determination of optimal step size in each iteration.The proposed algorithm has the property of simplicity and good restraint on stationary colored noise due to using the second-order cyclic statistics.Computer simulations show the effectiveness of proposed adaptive algorithm under low signal to noise ratio.

关 键 词：循环平稳性 自适应盲辨识 批处理算法 有色噪声 

分 类 号：TN911.5[电子电信—通信与信息系统]