Relay Selection for Security Enhancement in Cognitive Relay Networks

Yuanwei Liu, Lifeng Wang, Tran Trung Duy, Maged Elkashlan, Trung Q. Duong
2015 IEEE Wireless Communications Letters  
This letter proposes several relay selection policies for secure communication in cognitive decode-and-forward relay networks, where a pair of cognitive relays is opportunistically selected for security protection against eavesdropping. The first relay transmits the secrecy information to the destination, and the second relay, as a friendly jammer, transmits the jamming signal to confound the eavesdropper. We present new exact closedform expressions for the secrecy outage probability. Our
more » ... is and simulation results strongly support our conclusion that the proposed relay selection policies can enhance the performance of secure cognitive radio. We also confirm that the error floor phenomenon is created in the absence of jamming. Index Terms-Cognitive radio, cooperative networks, physical layer security.
doi:10.1109/lwc.2014.2365808 fatcat:eeyyhgsetjcnli7s6gjs3uurhm