一种认知无线电的分布式合作频谱检测方法  

Method for detecting cognitive radio spectrum based on distributed cooperation

作　　者：刘四喜[1] 何选森[1] 

机构地区：[1]湖南大学计算机与通信学院,长沙410082

出　　处：《计算机工程与应用》2011年第14期121-123,139,共4页Computer Engineering and Applications

基　　金：湖南省湘潭市科技计划项目(No.ZJ20071008)

摘　　要：在认知无线电的实际应用场景中,频谱检测技术至关重要。针对具有阴影衰落,多径衰落及噪声变化的无线通信环境,分析了噪声的不确定性对能量检测的影响,并根据每个认知用户接收到信噪比γ的不同,采用一种动态调整判决门限的合作检测方法来提高频谱检测率。仿真实验表明,该方法比一般的合作检测方案在避免对第一用户产生干扰的条件下,明显提高了频谱检测效率,使授权用户网络和认知用户网络都能得到可靠的通信。In the scenario of cognitive radio,spectrum detection technology is essential.For the wireless communications envi- ronment of shadow fading,multipath fading and noise changing,it analyzes the impact of noise uncertainty on energy detec- tion and uses a detection method of adjusting decision threshold dynamically to improve the efficiency of detection of coop- eration for each cognitive user receiving different SNR.The simulation results show that this method can avoid interfering the first user and make the authorized user and the cognitive users networks gain the reliable communications.

关 键 词：认知无线电 能量检测 噪声不确定性 合作检测 

分 类 号：TN911[电子电信—通信与信息系统]