认知无线电中一种基于循环谱的信号功率检测算法  

Power detection algorithm based on cyclic spectrum theory in cognitive radio

作　　者：张晓[1] 王金龙[1] 刘琼俐[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6期637-641,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);国家973计划资助项目(2009CB3020402)

摘　　要：为了提高信号功率的检测精度,在循环谱分析的基础上提出了一种基于循环谱的信号功率检测算法,该算法利用循环谱技术的谱分离特性在噪声中精确提取接收信号功率,并以M PSK信号为例给出了该算法详细的理论分析。计算机模拟仿真结果表明,无论是在高信噪比还是在低信噪比条件下,基于循环谱的接收信号功率检测算法的检测精度相比传统的检测方法均有较大的性能增益。该算法具有很好的应用前景。A threshold used＂ for primary user detection is highly susceptible to unknown or changing noise levels, which can greatly degrade the detecting performance of the detector. In order to improve the precision of the receiving signal power, this paper presented a detecting algorithm using cyclic spectrum theory based on the cyclostationary characteristic of the receiving signal. Theoretical analysis and the computer simulation results of the proposed algorithm, MPSK signal for instance, show that the performance of the proposed detecting algorithm is much better than the traditional way both in high and low SNR environment.

关 键 词：循环平稳 循环谱 能量检测 

分 类 号：TN929.5[电子电信—通信与信息系统]