Multi-Channel Spectrum Sensing in Cognitive Ad-hoc Networks:An Energy-Efcient Manner  

作　　者：李鹤 甘小莺 陈时阳 冯心欣 

机构地区：[1]Department of Electronic Engineering,Shanghai Jiaotong University [2]State Key Laboratory of Integrated Services Networks,Xidian University

出　　处：《Journal of Shanghai Jiaotong university(Science)》2013年第5期513-519,共7页上海交通大学学报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.61102052 and 60972050);the National Basic Research Program(973)of China(No.2010CB731803);the China Ministry of Education Fok Ying Tung Fund(No.122002);the National Science and Technology Major Project of China(Nos.2010ZX03002-007-01 and 2010ZX03003-001-01)

摘　　要：Cognitive radio,which is capable of enabling dynamic spectrum access,is a promising technology in future wireless communication.The feasibility of cognitive radio network greatly depends on the energy efciency and reliability of spectrum sensing technology.In this paper,spectrum sensing in cognitive ad-hoc network(CAN)with wide-band dynamic spectrum is considered.A cognitive cluster head(CCH)is set and responsible for dividing the wide-band spectrum into multiple sub-channels;it can either sense sub-channels in a centralized manner,or make use of sensing modules to sense sub-channels in a distributed manner.Then cognitive users(CUs)can get sensing results and access to the available sub-channel.We take the cost of control message into consideration and formulate the energy consumption of CAN in terms of sub-channel sampling rate and whole-band sensing time.We define energy efciency intuitively and solve the energy efciency optimization problem with sensing reliability constraints by constructing a parametric problem and obtain the optimal sampling rate and the wholeband sensing time.Power dissipation model of a practical A/D convertor(ADC)is introduced,and numerical results are given to show the energy efciency performance of two diferent sensing manners.Cognitive radio,which is capable of enabling dynamic spectrum access,is a promising technology in future wireless communication.The feasibility of cognitive radio network greatly depends on the energy efciency and reliability of spectrum sensing technology.In this paper,spectrum sensing in cognitive ad-hoc network（CAN）with wide-band dynamic spectrum is considered.A cognitive cluster head（CCH）is set and responsible for dividing the wide-band spectrum into multiple sub-channels;it can either sense sub-channels in a centralized manner,or make use of sensing modules to sense sub-channels in a distributed manner.Then cognitive users（CUs）can get sensing results and access to the available sub-channel.We take the cost of control message into consideration and formulate the energy consumption of CAN in terms of sub-channel sampling rate and whole-band sensing time.We define energy efciency intuitively and solve the energy efciency optimization problem with sensing reliability constraints by constructing a parametric problem and obtain the optimal sampling rate and the wholeband sensing time.Power dissipation model of a practical A/D convertor（ADC）is introduced,and numerical results are given to show the energy efciency performance of two diferent sensing manners.

关 键 词：cognitive radio spectrum sensing energy efciency ad-hoc network MULTI-CHANNEL 

分 类 号：TN929.5[电子电信—通信与信息系统]