一种优化的认知无线电频谱感知策略  

An Optimized Cooperative Spectrum Sensing Strategy of Cognitive Radio

作　　者：韩昭芳[1] 蒋挺[1] 赵成林[1] 周正[1] 

机构地区：[1]北京邮电大学,北京100876

出　　处：《无线电工程》2011年第5期1-3,35,共4页Radio Engineering

基　　金：国家重大专项基金(2009ZX03006-006;2010ZX03006-006)

摘　　要：协作频谱感知技术可以有效地避免频谱感知过程中的隐终端问题,降低感知用户对主用户的干扰。但是随着协作感知中感知用户数目的增加,感知中的通信量也会增加。相对于传统的协作感知单门限判决法,双门限判决法可以在对感知性能影响很小的情况下,降低协作感知过程中的通信量。在传统的双门限感知技术的基础上,提出了一种基于权重的双门限协作算法。仿真结果表明,在保证较小的感知通信量下,相对于传统的双门限判决,提出的算法可以提高系统的感知性能。The hidden-terminal problem during spectrum sensing can be avoided by cooperative sensing so as to reduce the interference to primary user.However,the traffic flow during spectrum sensing increases as the number of cognitive users is increasing.In contrast with the single-threshold sensing method,double-threshold sensing method can decrease the traffic flow with little impact to sensing efficiency.A weighted-based double-threshold spectrum sensing algorithm is proposed in this paper.Simulation results show that compared with the traditional double-threshold sensing method,weighted-based double-threshold algorithm can improve the performance of sensing greatly.

关 键 词：认知无线电 协作感知 双门限 权重 

分 类 号：TN911.72[电子电信—通信与信息系统]