Physical Layer Secrecy Performance Analysis over Rayleigh/Nakagami Fading Channels

1 Abstract—The broadcast nature of wireless communications makes it vulnerable to attack or eavesdropping. Therefore, information security is an important issue in wireless communications, especially in distributed networks such as wireless sensor networks and ad hoc wireless networks. In this paper, we present the physical layer secrecy performance analysis of singleinput single-output (SISO) systems consisting of single antenna devices, in the presence of a single antenna passive eavesdropper over dissimilar Rayleigh/Nakagami fading channels. Especially, we derive exact close-form expressions for the probability that secrecy capacity exists and the secrecy outage probability using statistical characteristics of the signal-to-noise ratio. These expressions allow us to assess the security capability of the considered single-input singleoutput systems. The analytical result are verified by Monte-Carlo simulation.