A New Max-Ratio Relay Selection Scheme in Secure Buffer-Aided Cooperative Wireless 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 letter, a new max-ratio relay selection scheme in secure buffer-aided cooperative wireless networks is proposed and evaluated. The proposed relay selection criteria considers an important constant parameter in instantaneous secrecy capacity. It has the same complexity with the existing max-ratio relay selection scheme, and can provide significant performance improvement. For the asymmetric relay-links, a low complexity power allocation scheme is also proposed. The superiority of the proposed schemes is verified by Monte Carlo simulation results.