Secrecy Performance of Buffer-Aided Hybrid Virtual Full-Duplex and Half-Duplex Relay Activation

Abstract

This paper proposes a novel secure buffer-aided relay selection capable of amalgamating virtual full-duplex (VFD) and half-duplex (HD) modes. Our scheme is designed to allow multiple relays to share a common packet seamlessly and to eliminate the effects of inter-relay interference induced in the VFD mode by successive interference cancellation. Since the VFD mode has the potential to achieve a higher secrecy capacity than the other four HD modes, the highest priority to the activation of the VFD mode is given in the proposed scheme. Our performance results demonstrate that the proposed scheme outperforms the benchmarks in terms of the secrecy outage probability, the delay, and the average secrecy rate.

Keywords

• Buffer
• cooperative beamforming
• half-duplex
• Markov chain
• physical layer security
• relay selection