认知无线电系统中协同能量检测算法的性能研究  

Energy Detection Algorithm Investigation Based on Cooperative in Cognitive Radio Systems

作　　者：虞贵财[1,2] 罗涛[1,2] 乐光新[1,2] 

机构地区：[1]北京邮电大学无线通信系统与网络实验室,北京100876 [2]泛网无线通信教育部重点实验室(北京邮电大学),北京100876

出　　处：《电子与信息学报》2009年第11期2682-2686,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60872049;60871042;60971082);国家863计划项目(2007AA10Z235);高等学校博士学科点专项科研基金(20050013005);教育部留学归国人员教学;科研建设项目资助课题

摘　　要：该文首先研究了单认知用户能量检测算法的检测性能和检测灵敏度与检测时长和噪声短时间内平均功率波动性之间的关系,得出检测性能和检测灵敏度随噪声短时间内平均功率波动性的增大而急剧下降的结论,在低信噪比时尤为明显;针对检测性能和检测灵敏度随噪声短时间内平均功率波动性的增大而急剧下降,提出了基于多用户协同能量检测算法。仿真表明,在低信噪比环境下,即使噪声短时间内的平均功率存在较大的波动性,只要适当地增加协同检测的用户数,仍可获得较为准确的检测性能。In this paper,detection performance and detection sensitivity with detection duration and noise average power fluctuation in short time is investigated firstly.Performance accuracy and detection sensitivity drop quickly with noise average power fluctuation increasing and it is worse when signal-to-noise ratio lower.Considering the characteristic,a novel new energy detection algorithm based on cooperative is presented.Simulations show that the proposed scheme improves antagonism of noise average power fluctuation in short time and gets a good detection performance as long as increasing the number of cooperative detection users.

关 键 词：认知无线电 能量检测 噪声平均功率波动性 检测灵敏度 协同检测 

分 类 号：TN92[电子电信—通信与信息系统]