基于循环相关滤波联合循环谱的频谱感知技术  

Spectrum sensing method based on cyclic correlation filter and spectral correlation

作　　者：林生森[1] 吴启晖[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《解放军理工大学学报（自然科学版）》2008年第4期307-311,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家863计划资助项目(2007AA01Z267)

摘　　要：为了实现认知无线电系统的动态频谱管理和接入,认知无线电设备需要不断地对频谱进行感知。针对传统的基于循环谱的感知原理,在低信噪比有限数据情况下其检测性能一般这一不足,提出了一种基于循环相关滤波联合循环谱的感知算法,分析了循环相关滤波器及改进算法。改进算法利用了循环相关滤波和循环谱的双重抑制噪声性能,而计算复杂度只是有限增加。仿真表明,改进算法比传统的基于循环谱的感知方法具有更强的抗噪声性能,适合认知无线电的需要。For the implementation of dynamic spectrum management and dynamic spectrum access, cognitive users need to sense the spectrum continuously. The conventional spectrum sensing method based on cyclostationary feature detection was reasearched. In view of the fact that the conventional method performed insufficiently with finite data samples in low SNR scenarios, a novel sensing approach based on cyclic correlation filter joints spectral correlation was proposed. The improved method took advantage of the noise-rejection property of both cyclic correlation filter and spectral correlation analysis. Simulation results show that the improved method has a better performance than the conventional one.

关 键 词：认知无线电 频谱感知 循环相关滤波 循环谱 

分 类 号：TN929[电子电信—通信与信息系统]