空间相关信道下一种合作感知节点集合选择算法  

A Cooperative Sensor Set Selecting Algorithm under Spatial Correlation

作　　者：张晓[1] 王金龙[1] 吴启晖[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：《信号处理》2010年第10期1489-1494,共6页Journal of Signal Processing

基　　金：国家高技术研究发展计划("863"计划)基金资助项目(2009AA01Z243);国家重点基础研究计划("973"计划)基金资助项目(2009CB3020400);国家自然科学基金资助项目(60932002)

摘　　要：在空间相关信道条件下随着合作感知节点数目的增加,新增合作感知节点所带来的性能增益将会越来越小并趋近于零,同时系统资源使用效率也将会随着合作感知节点数目的增加而降低,因此在选择合作感知节点数目时需要在感知性能与资源使用效率之间进行折衷。本文提出了一种合作感知节点集合的贪婪选择算法。该算法首先在对感知性能和资源使用效率进行折衷的基础上得到判决门限,并依此判决门限选择满足条件的合作感知节点集合。仿真结果证明了所提出算法的有效性与可靠性。The problem of sensor set selection for cooperative spectrum sensing in cognitive radio networks is considered in this paper.To the best of our knowledge,this is the first effort to select sensor set for cooperative spectrum sensing in cognitive radio.Under spatial correlation channels,the cooperative gain of the newly added cooperative sensor decreases and converges to zero as the number of cooperative sensors increases.Meanwhile,the system resources usage efficiency decreases as the number of cooperative sensors increases, since the consumption of system resources,such as the total transmission power of the signal measurements and the amount of overhead traffic in the cognitive radio network,grows approximately linearly with the number of cooperative sensors.Therefore,the number of cooperative sensors to use is a compromise between sensing performance and system resources usage efficiency.A greedy based cooperative sensor set selecting algorithm is proposed which can use a threshold acquired by compromising between sensing performance and resources usage efficiency to select a cooperative sensor set.Numerical results illustrate the effectiveness and reliability of the proposed sensor set selecting algorithm.

关 键 词：认知无线电 合作感知节点集合选择 资源使用效率 

分 类 号：TN929.5[电子电信—通信与信息系统]