Relay Selection for Security Enhancement in Cognitive Relay Networks

Yuanwei Liu, Lifeng Wang, Tran Trung Duy, Maged Elkashlan, Trung Q. Duong

Research output: Contribution to journalArticlepeer-review

169 Citations (Scopus)
548 Downloads (Pure)


This letter proposes several relay selection policies for secure communication in cognitive decode-and-forward (DF) relay networks, where a pair of cognitive relays are 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 closed-form expressions for the secrecy outage probability. Our analysis 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.
Original languageEnglish
Pages (from-to)46-49
Number of pages4
JournalIEEE Wireless Communications Letters
Issue number1
Publication statusPublished - 01 Feb 2015

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