基于分布式压缩感知的宽带协作频谱感知算法  

Wideband cooperative spectrum sensing algorithm based on distributed compressed sensing

作　　者：胡静[1] 肖海林[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2015年第1期21-25,共5页Journal of Guilin University of Electronic Technology

基　　金：国家重点基础研究发展计划(973计划)(2008CB317109);广西自然科学基金(2011GXNSFD018028);广西无线宽带通信与信号处理重点实验室主任基金(12111)

摘　　要：针对认知无线电中传统的宽带压缩频谱感知算法计算复杂度高、检测实时性差的缺点,提出基于分布式压缩感知信道能量观测差值的宽带协作频谱感知算法。该算法无需重构T+1时刻的信号频谱,只需重构T+1时刻与T时刻的信道能量差值,进而得到T+1时刻的信道能量;另外,为减少深衰落、阴影衰落等不利因素的影响,采用多个次用户协作频谱感知。数值分析表明,该算法所需的平均感知时耗为直接重构T+1时刻的信道能量算法的50%左右,且获得了检测概率大于0.95的检测性能。To reduce complexity and meet real-time detection for the traditional wideband compressed spectrum sensing algorithm,a distributed compressed spectrum sensing algorithm based on difference of channel energy measurements is presented.The algorithm reconstructs difference of channel energy between T moment and T＋1moment,and then gets the channel energy at T＋1moment without reconstructing the signal spectrum at T＋1moment;besides,to reduce the impact of deep fading,shadow fading and other unfavorable factors,multiple secondary users cooperative spectrum sensing is applied.Numerical results show that the proposed algorithm needs about 50% of sensing time for reconstructing the channel energy at T＋1moment directly,and acquires sensing performance such that the detection probability is above 0.95.

关 键 词：认知无线电 频谱感知 分布式压缩感知 信道能量观测差值 

分 类 号：TN929.5[电子电信—通信与信息系统]