基于循环平稳特性的双循环频率频谱感知技术  

Cyclostationary spectrum-based dual cycle frequencies sensing technique

作　　者：钟国辉[1] 赵震[2] 屈代明[1] 

机构地区：[1]华中科技大学电子与信息工程系,湖北武汉430074 [2]华中科技大学数学与统计学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2010年第7期78-81,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60702039)

摘　　要：为提高动态频谱接入过程中对主要用户的检测性能,提出将双循环频率频谱感知技术用于Dandawate检验的方法.分析了在多径衰落环境下双循环频率上的循环自相关,利用主要用户通信信号在正负循环频率上的共轭循环自相关受噪声和多径衰落影响弱相关的特性,将Dandawate的渐进最优检验算法扩展到双循环频率,并保留了恒定误警概率的性质,论证了双循环频率感知技术能够达到频率分集的效果.通过对比仿真证实其较单循环检测器有更好的检测效果.To improve the performance of primary user detection in dynamic spectrum access,dual cycle frequency technique was applied to the Dandawate′s algorithm for spectrum sensing. The cyclic autocorrelations at dual cycle frequencies in multipath fading model was analyzed. Under the effect of noise and difference of multipath fading,the signal conjugate cyclic autocorrelations at positive and negative cycle frequencies are weak correlation. By using this property,the Dandawate′s asymptotically optimal detection algorithm can be extended to dual cycle frequencies for spectrum sensing,which preserve the constant false alarm rate property. Also,we show that the proposed dual cycle sensing scheme can achieve frequency diversity effect. The simulation results demonstrate that the proposed scheme performs much better than the single cycle detector.

关 键 词：认知无线电 频谱感知 循环平稳检测 双循环频率 动态频谱接入 

分 类 号：TN911.23[电子电信—通信与信息系统]