Impact of Primary Interference on Secrecy Performance of Physical Layer Security in Cognitive Radio Networks

Abstract

In cognitive radio networks (CRNs), primary interference is either neglected or considered as an additive white Gaussian random variable (r.v.). Current literature investigated such a case in evaluating their security capability. Generalizing this literature by considering primary interference power as exponentially-distributed r.v., we propose an analysis framework on impact of primary interference on security capability of CRNs under Rayleigh fading channels, peak transmit power constraint, and interference power constraint. The proposed framework is corroborated by Monte-Carlo simulations and illustrates that information securing performance in CRNs is saturated at either large values of peak transmit power or peak interference power, and can be enhanced by primary interference.