Secrecy Performance and Power Allocation for Cooperative Vehicular Relaying Networks in the Presence of Interference

Abstract

This paper investigates the secrecy performance of cooperative vehicular relaying networks in the presence of a source of interference. The network consists of a fixed source node, a fixed destination, a fixed source of interference, a mobile relay, and a mobile passive eavesdropper. Except for the channel from the relay to the eavesdropper, all of the channel coefficients between the nodes are represented as Nakagami-m fading channels. We construct closed-form formulas for the secrecy outage probability (SOP), the asymptotic SOP (ASOP), and the probability of non-zero secrecy capacity (PNZSC). Furthermore, a proposed power allocation model is presented to reduce the SOP about the source and relay transmission powers. The impact of the channel condition, the secrecy data rate threshold, and the strength of interference on the secrecy performance are presented and demonstrated. In addition, the proposed power allocation model enhances the system secrecy performance compared to the equal power distribution model.