认知无线电中基于循环平稳特征的频谱感知方法  

Cyclostationarity-based spectrum sensing in cognitive radio

作　　者：漆渊[1] 彭涛[1] 钱荣荣[1] 王文博[1] 

机构地区：[1]北京邮电大学信息与通信工程学院,北京100876

出　　处：《重庆邮电大学学报（自然科学版）》2009年第3期353-357,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家"973"重点基础研究发展计划资助(2007CB310602);NokiaR & DDevice资助

摘　　要：提出一种基于信号频域循环平稳特征的频谱感知方法,该方法能够区分出授权和非授权信号的类型从而获取不同的频谱共享策略将授权信号及非授权信号分别建模成线性周期时变变换,对授权信号和非授权信号进行频域的循环平稳特征分析,给出2类信号呈现循环平稳特征的位置,并给出用于鉴别2类信号的检测方法,其中推导了复过程中近似协方差矩阵的计算。仿真结果验证了该方法能在低信噪比中有效地鉴别出授权及非授权2类信号。A spectrum sensing method exploiting cyclostationarity in frequency domain was proposed. This method can distinguish the types of authorized signal and unauthorized signal and gain different spectrum sharing strategy. The authorized signal and unauthorized signal were modeled to linear periodically time variant （LPTV） transformation, the method for dis- tinguishing these two signals were given, and an approximate computation of covariance matrix for practice was derived. Simulation results show that this method can distinguish the authorized and unauthorized signals effectively at low SNR.

关 键 词：认知无线电 频谱感知 循环平稳特征 

分 类 号：TN911[电子电信—通信与信息系统]