Optimization of threshold for local spectrum sensing with energy detector  

作　　者：翟旭平 贺海根 郑国莘 

机构地区：[1]Key Laboratory of Specialty Fiber Optics and Optical Access Networks, School of Communication and Information Engineering, Shanghai University

出　　处：《Journal of Shanghai University(English Edition)》2011年第2期132-136,共5页上海大学学报（英文版）

基　　金：Project supported by the Shanghai Leading Academic Discipline Project (Grant No.S30108);the Science and Technology Commission of Shanghai Municiplity (Grant No.08DZ2231100);the National Natural Science Foundation of China (Grant No.60872021)

摘　　要：Spectrum sensing is the first step of cognitive radio （CR）. In this area, previous researches mostly consider distributed local nodes which are under identical channel conditions, hence uniform and fixed detection threshold is set with energy detector. However, the distributions of nodes in real environments are not quite the same. In this paper, the optimal threshold to minimize the total detection error over add＇itive white Gaussion noise （AWGN） channel is derived firstly. Then the dynamic threshold scheme is proposed to reduce the average total detection error. Simulations have shown that, with this scheme, sensing performance is improved.Spectrum sensing is the first step of cognitive radio （CR）. In this area, previous researches mostly consider distributed local nodes which are under identical channel conditions, hence uniform and fixed detection threshold is set with energy detector. However, the distributions of nodes in real environments are not quite the same. In this paper, the optimal threshold to minimize the total detection error over add＇itive white Gaussion noise （AWGN） channel is derived firstly. Then the dynamic threshold scheme is proposed to reduce the average total detection error. Simulations have shown that, with this scheme, sensing performance is improved.

关 键 词：spectrum sensing energy detector optimal threshold dynamic threshold scheme 

分 类 号：TN925[电子电信—通信与信息系统]