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Secure Communications in Cognitive Underlay Networks over Nakagami-m Channel

Research output: Contribution to journalArticle

Nam-Phong Nguyen, Tu Lam Thanh, Trung Q. Duong, A. Nallanathan

Original languageEnglish
Pages (from-to)610-618
Number of pages9
JournalPHYCOM: Physical Communication
Volume25
Issue number2
Early online date16 Jun 2016
DOIs
Publication statusPublished - Dec 2017

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Abstract

In this paper, the secure communication of cognitive radio network (CRN) over Nakagami-$m$ fading channel is investigated. An underlay protocol is used in the considered network, where the unlicensed users or secondary users (SUs) can operate simultaneously with the primary users (PUs) in the same spectrum bands providing that the transmit power of the SUs is constrained by not only the maximum tolerance interference at the PU's receiver but also the maximum transmit power at the SU's transmitter. The exact closed-form expressions of important secure performance metrics, i.e., secrecy outage probability (SOP) and secrecy capacity (SC), are derived. In addition, to give a deep insight into the secure performance trends, the asymptotic expression of the SOP is also obtained when the average
signal-to-noise ratio (SNR) of the legitimate channel is high.
It is proven that the considered system achieves full diversity gain
regardless of the number of antennas at the eavesdropper. Finally, the
correctness of our mathematical framework is verified by Monte Carlo
simulations.

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