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Optimal MAC based cooperative spectrum sensing in cognitive radio networks
Authors:CHEN Zhong  ZHANG XianDa  & YANG LanJuan  State
Affiliation:Key Laboratory of Intelligent Technology and Systems,Tsinghua National Laboratory for Information Science and Technology,Department of Automation,Tsinghua University,Beijing 100084,China;2 Institute of Command Automation,PLA University of Science and Technology,Nanjing 210007,China
Abstract:This paper considers a cognitive radio (CR) system in non-ideal fading wireless channels and pro-poses cooperative spectrum sensing schemes based on coherent multiple access channels (MAC),serving as an alternative way to improve the cooperative spectrum sensing performance and provide space diversity for spec-trum sensing.Sufficient statistics are transmitted using a common channel from the secondary users (SUs) to a fusion center (FC) where the global decision is obtained.The optimal scaling factors of the proposed schemes are obtained by maximizing the detection probability under a target false alarm probability and a transmit power constraint.Because the proposed optimal MAC scheme has high computational complexity,a sub-optimal solu-tion based on maximization of the deflection coefficient (DC) is also proposed.Simulation results show that the proposed algorithms can significantly improve the spectrum sensing performance and approach the detection baseline.
Keywords:cognitive radio (CR)  spectrum sensing  multiple access channel (MAC)  deflection coefficient  optimization
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