Secrecy Performance Analysis over Inverse Gamma Composite Multicast Fading Channels

Abstract

Secrecy performance of realistic wireless multicast scenarios are significantly deteriorated by simultaneous occurrence of multipath and shadowing which are modeled using composite fading channels. To resolve this security threat, in this paper a framework is proposed where a source transmits private multicast messages to multiple receivers over η - μ / inverse gamma composite fading channels. A group of eavesdroppers are trying to overhear this secret communication. Perfect secrecy is obtained if eavesdropper can not decode any information from the multicast links. Secrecy analysis is carried out deriving closed-form expressions of two well-known secrecy measures i.e. probability of non-zero secrecy capacity and secure outage probability for multicasting. The impacts of multipath, shadowing and other system parameters on the outage performance of the proposed scenario are quantified using the derived expressions. A generic nature of η - μ / inverse gamma distribution is obtained by showing Rayleigh, Nakagami-m, Nakagami-q, η - μ fading and Gaussian channels as a special case of this distribution. Finally, Monte-Carlo simulations are presented to verify the derived expressions.