Max-Ratio Relay Selection for Secure Communication in Amplify-and-Forward Buffer-Aided Cooperative Networks

It has been verified cooperative communication technology is an effective way to achieve physical layer security. Recently, people paid much attention to the cooperative networks with buffering relay, which can get significantly performance advantage. In this paper, we investigate the secure problem in amplify-and-forward buffer-aided cooperative networks. We modeled the AF secure cooperative network with buffering relay, and proposed max-ratio relay selection criterion, which we call B-AFbMRS for short (Buffer-aided AF based Max-Ratio relay Selection). Simulation results show that, for AF secure cooperative network, buffer aided relay can significantly enhance the secrecy outage probability.