一种适用于认知超宽带的CUSUM频谱感知算法  

Novel CUSUM spectrum sensing algorithm in cognitive UWB

作　　者：宋晓鸥[1] 向新[1] 毕笃彦[1] 陈顺方[2] 

机构地区：[1]空军工程大学工程学院,陕西西安710038 [2]航空电子系统综合技术国防科技重点实验室,上海200233

出　　处：《西安电子科技大学学报》2011年第6期173-178,共6页Journal of Xidian University

基　　金：航空科学基金资助项目(20095596014)

摘　　要：提出了一种新的认知超宽带频谱感知算法,该算法适合检测低平均信噪比、低占空比的超宽带脉冲信号,且具有复杂度低、检测延迟性能优越的特点.论文根据超宽带脉冲信号特性,给出形式统一的低占空比接收信号概率密度函数表达式,并采用累加和(CUSUM)算法实施检测.仿真结果表明,该算法对低占空比信号具有良好的适应性,有效克服了能量检测的信噪比门限效应,且检测延迟性能优越.A novel Cognitive UWB spectrum sensing algorithm is proposed and evaluated,which enables the detection of the low average SNR and low duty ratio signal with low complexity and small detection delay.An uniform probability density function of the low duty ratio received signal is constructed based on the characteristic of the UWB pulse signal.CUSUM test is introduced to implement the detection.Theoretical analysis indicates that the proposed algorithm is suitable for low duty ratio signal detection.Compared with the energy detection algorithm,the proposed algorithm conquers the SNR wall phenomenon,with superior detection delay performance.Furthermore,the theoretical analysis results are proved by simulations.

关 键 词：认知超宽带 频谱感知 累加和 检测延迟 

分 类 号：TN92[电子电信—通信与信息系统]