Alpha稳定分布噪声下时频重叠信号的载波频率估计方法  

Carrier Frequency Estimation Method of Time-frequency Overlapped Signals with Alpha-stable Noise

作　　者：李兵兵[1] 马洪帅[1] 刘明骞[1] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,西安710071

出　　处：《电子与信息学报》2014年第4期868-874,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61271299);国家863计划项目(2007AA01Z288);高等学校学科创新引智计划项目(B08038)资助课题

摘　　要：针对Alpha稳定噪声下时频重叠信号载波频率估计困难的问题,该文提出一种Alpha稳定噪声下时频重叠信号的载波频率估计方法。该方法首先提出时频重叠信号的广义四阶循环累积量的定义,然后检测离散谱线所对应的广义四阶循环累积量幅度谱的循环频率,进而估计出各个信号分量的载波频率,最后进行渐近性的理论分析,证明了该估计方法是渐近无偏和一致的。仿真结果表明,在Alpha稳定分布噪声下,该方法具有良好的估计性能和稳健性。In order to solve the issue that carrier frequency estimation of time-frequency overlapped signals is difficult in Alpha-stable distribution noise environment, a novel carrier frequency estimation method of the time-frequency overlapped signals is proposed. First the definition of Generalized Fourth-Order Cyclic Cumulant （GFOCC） of the time-frequency overlapped signals is proposed. Then the carrier frequency of each signal component is estimated by detecting the cycle frequency of the amplitude spectrum of GFOCC, which is corresponding to discrete spectra line. Finally, the theoretical asymptotic analysis demonstrates that this estimation method is asymptotically unbiased and consistent. Simulation results show that the proposed method achieves good estimation performance and robustness in Alpha-stable distribution noise environment.

关 键 词：信号处理 ALPHA稳定分布 时频重叠 参数估计 载波频率 广义循环累积量 

分 类 号：TN911.7[电子电信—通信与信息系统]