认知无线电系统中感知时间的优化  

Optimization of sensing time in cognitive radio systems

作　　者：丁汉清[1,2] 杨家玮[1] 赵志远[1] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071 [2]郑州轻工业学院计算机与通信工程学院,河南郑州450002

出　　处：《华中科技大学学报（自然科学版）》2011年第8期84-87,113,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家重点基础研究发展计划资助项目(2009CB320404);国家自然科学基金资助项目(61072068);中央高校基本科研业务费专项资金资助项目(K50510010022)

摘　　要：以能量检测作为频谱感知的基本方法,以次用户平均信道效率作为衡量认知无线电系统性能的参考标准,分析了存在多条主用户信道时,在次用户频谱感知的不同阶段,感知时长对认知无线电系统性能的影响.推导了授权用户对干扰的防护得到满足的前提下,使次用户平均信道效率最大时,感知时长必须满足的条件,并通过仿真对理论分析进行了验证.仿真结果表明:次用户可以通过选择最佳的感知时长,使其平均信道效率得到优化.Taking energy detection as the basic method of spectrum sensing and the average channel efficiency as the reference criterion for evaluating a cognitive radio system′s performance,the effect of sensing durations in different spectrum sensing stages on the sensing performance was analyzed in the context of multiple primary channels.The sensing durations that maximize the secondary user′s average channel efficiency were derived while providing the primary users with their desired level of interference protection.The theoretic analysis was verified by the simulation results.Results show that the secondary user can select the optimum sensing duration to optimize its average channel efficiency.

关 键 词：无线电系统 认知系统 频谱机会 频谱感知 最优化 

分 类 号：TN911.23[电子电信—通信与信息系统]