摘要
In this paper,a cooperative spectrum sensing scheme,which is based on cooperation of a certain number of secondary users and cooperative diversity under multi-antenna scenario,is proposed.Under multi-antenna scenario,we set a targeted detection probability and optimize the false alarm probability of the network by choosing a certain number of secondary users with the highest primary user’s signal to noise ratio.The detection performance of the network is also evaluated when all the secondary users are cooperating to illustrate the benefits of the proposed scheme as a contrast.In addition,how to choose the detection threshold of the secondary user is analyzed for the purpose of decreasing the average risk.Theory analysis and simulation results show that the optimum false alarm probability can be derived by cooperating a certain number of secondary users rather than all the secondary users and the detection performance of the network can be further improved if secondary users are equipped with multiple antennas.Also,a minimum average risk can be obtained by optimizing the detection threshold.
In this paper, a cooperative spectrum sensing scheme, which is based on cooperation of a certain number of secondary users and cooperative diversity under multi-antenna scenario, is proposed. Under multi- antenna scenario, we set a targeted detection probability and optimize the false alarm probability of the network by choosing a certain number of secondary users with the highest primary user＇s signal to noise ratio. The detection performance of the network is also evaluated when all the secondary users are cooperating to illustrate the benefits of the proposed scheme as a contrast. In addition, how to choose the detection threshold of the secondary user is analyzed for the purpose of decreasing the average risk. Theory analysis and simulation results show that the optimum false alarm probability can be derived by cooperating a certain number of secondary users rather than all the secondary users and the detection performance of the network can be further improved if secondary users are equipped with multiple antennas. Also, a minimum average risk can be obtained by optimizing the detection threshold.
基金
Acknowledgments The authors are supported by The National 863 Program under Grants 2009AA01Z247 and by National Nature Science Foundation of China （NSFC） under Grants 60972076, 61072052.
作者简介
WANG Xiaoxiang was born in 1969. Profi Wang is doctor supervisor in school of information and telecommunication Engineering. She received her PH.D. degree from BIT in 1998, and once was a visit scholar in Austria University of Technology in Vienna from 2001 to 2002. Her research is now supported by the National 863 Program and the National Natural Science Foundation, with 4 patents and more than 50 papers published in the area of Cooperative Communication, MIMO OFDM and Cooperative Position Locating area.
