基于循环谱对称性的频谱感知算法  

Spectrum sensing algorithm based on symmetry of cyclic spectral correlation

作　　者：高玉龙[1] 陈艳平 管修挚[1] 张中兆[1] 沙学军[1] 

机构地区：[1]哈尔滨工业大学通信技术研究所,黑龙江哈尔滨150080 [2]哈尔滨工程大学计算机科学与技术学院,黑龙江哈尔滨150001

出　　处：《通信学报》2011年第11期21-26,34,共7页Journal on Communications

基　　金：国家重点基础研究发展计划("973"计划)基金资助项目(2007CB310601);中央高校基本科研业务费专项基金资助项目(HITNSRIF2012018)~~

摘　　要：针对现有基于循环谱的频谱感知算法的不足,利用改进SSCA算法计算接收信号的循环谱,减少算法的计算量;利用循环谱的对称性,选择非零循环频率处的循环谱抵抗干扰和噪声,结合对称性搜索策略进行频谱感知。分析并仿真了循环谱的参数对频谱感知算法的影响,仿真结果证明了所提出算法克服了传统算法的不足,提高了低信噪比下的正确检测性能。In response to the shortcoming of conventional algorithms,modified SSCA was exploited to calculate the cy-clic spectral correlation of received signal for decreasing the computational complexity.Symmetry of cyclic spectral cor-relation（CSC） was used to detect the idle spectrum,criteria and method of selecting and judging symmetry were pro-posed.Conventional binary hypothesis condition was translated to concrete value according to symmetry.In order to eliminate the effect of interference and noise,non-zero cyclic frequencies were selected.Finally,the performance of the presented algorithm was compared with the conventional algorithms by virtue of simulation.Simulation results proved the correctness and the superiority of new algorithms.Using symmetry improves the successful detection probability for low SNR and reduces the computational complexity.

关 键 词：循环谱 频谱感知 分段谱相关算法 循环谱对称性 

分 类 号：TN913[电子电信—通信与信息系统]