基于信噪比权值的合作频谱感知技术

Cooperative spectrum sensing technology based on SNR weighted

根据无线环境中各个认知用户的信噪比不同,提出一种基于信噪比权值的合作频谱感知算法。认知用户根据与主用户之间路径衰落因子的不同,得出各自的信噪比值,再通过递归得到相应的权值。融合中心进行加权融合得出最终判决结果。仿真结果表明,这种算法可以提高对主用户的检测概率,其检测性能也优于传统的硬判决融合准则。

According to the SNR of the cognitive users is different in the wirelss environment,a cooperative spectrum sensing method based on the SNR-weighted is proposed.Cognitive users receive the value of SNR according to the difference of distance fading factor between the cognitive users and the primary user,then evaluate the corresponding weight using recursive method.Fusion center gives the final decisive result by weight fusion.Simulation results indicate that the algorithm can improve the detection probability of the primary users.The detection performance is also better than that of the tradional hard decision method.