Physical-Layer Security of a Buffer-Aided Full-Duplex Relaying~System

TL;DR

This paper introduces a hybrid relaying scheme combining half- and full-duplex modes with buffer-aided relays to significantly improve physical-layer security and throughput in relay channels.

Contribution

It proposes a novel hybrid relaying scheme with mode switching and different strategies to enhance security over traditional bufferless full-duplex relaying.

Findings

Significant increase in average secrecy throughput.

Effective use of relaying strategies for security enhancement.

Improved security performance over conventional schemes.

Abstract

This letter proposes a novel hybrid half-/full-duplex relaying scheme to enhance the relay channel security. A source node (Alice) communicates with her destination node (Bob) in the presence of a buffer-aided full-duplex relay node (Rooney) and a potential eavesdropper (Eve). Rooney adopts two different relaying strategies, namely randomize-and-forward and decode-and-forward relaying strategies, to improve the security of the legitimate system. In the first relaying strategy, Rooney uses a codebook different from that used at Alice. In the second relaying strategy, Rooney and Alice use the same codebooks. In addition, Rooney switches between half-duplex and full-duplex modes to further enhance the security of the legitimate system. The numerical results demonstrate that our proposed scheme achieves a significant average secrecy end-to-end throughput improvement relative to the conventional bufferless full-duplex relaying scheme.