【摘要】 在认知无线电系统中,通过认知用户的彼此协作,可以显著提高频谱感知的性能.在实际工作环境中,由于认知用户之间的差异,其信噪比会不同,每个认知用户的局部判决在融合中心对全局判决的影响也不同,因此本文提出一种基于信噪比加权的感知技术,给不同信噪比的用户能量分配不同的权重,采用间接的动态改变不同信噪比用户的判决门限的方法.仿真结果表明,在一定环境下,该算法能提高协作感知性能.更多还原

【Abstract】 In cognitive radio systems,collaboration between cognitive users can improve the performance of spectrum sensing significantly.However,in a real enviornment,the SNR of each cognitive user is different,their local decisions also have different impacts on the final decision in fusion center.Therefore,a method of SNR-based weighted cooperative spectrum sensing is proposed.In this paper,we assign different weights to different users according to their SNRs,and change the energy thresholds of different users indirectly.Simulation results show that our method can get an improvement of the sensing performance.更多还原