摘要
认知无线电技术可有效地检测到授权频段的频谱空洞,从而提高频谱效率。能量检测由于不需要授权用户的先验信息而被广泛应用。然而由于接收的噪声存在不确定性,使得在信噪比低于某一闸值时,无论观测时间多长,都无法保证检测结果满足要求的检测性能,这一闸值被称作"信噪比墙"。本文通过信噪比墙这一现象进行分析,同时由于协作感知算法在确定噪声下在提高检测性能方便表现出的优势,提出一种基于信噪比墙的协作能量检测算法,通过仿真结果分析,表明本文算法在检测性能和节能上较已有的协作算法具有优势。
Cognitive Radio （CR） technology has been proved effective to detect the spectrum holes,and thus improves the spectrum.Since energy detection requires low complexity for the detectors and requires little transcendental information about licensed users＇signals,it has been widely applied.However,single user detection has been proved vulnerable to the noise uncertainty,which causes the existence of a SNR wall below which the detector cannot robustly achieve the given detection requirement.We analyzes the phenomenon SNR wall in this paper,for the cooperative sensing algorithm can effectively improve the detection performance under the assumption of certain noise,a cooperative energy spectrum sensing algorithm based on SNR wall is proposed.The simulation results and analysisshows that the proposed algorithm has advantages on both the detection performance and energy efficiency than the existing cooperative algorithms.
出处
《电子设计工程》
2014年第6期89-91,共3页
Electronic Design Engineering
关键词
认知无线电
信噪比墙
能量检测
协作检测
Cognitive Radio （CR）
SNR wall
energy detection
cooperative sensing
