Physical Layer Security Schemes for Full-Duplex Cooperative Systems: State of the Art and Beyond

TL;DR

This paper reviews physical layer security approaches for full-duplex cooperative wireless systems, highlighting recent advances, presenting a case study on jamming schemes, and discussing future research challenges.

Contribution

It provides a comprehensive survey of PLS schemes for FD cooperative systems, introduces a novel source-based jamming case study, and outlines future research directions.

Findings

FD cooperative PLS schemes have unique challenges.

A source-based jamming scheme improves secrecy performance.

Future research needs to address practical implementation issues.

Abstract

Due to the broadcast nature of wireless medium, wireless communication is highly vulnerable to eavesdropping attack. Traditionally, secure wireless data transmission has relied on cryptographic techniques at the network layer which incur high computational power and complexity. As an alternative, physical layer security (PLS) is emerging as a promising paradigm to protect wireless systems by exploiting the physical characteristics of the wireless channels. Among various PLS approaches, the one based on cooperative communication is favorable and has got a lot of interest from the research community. Although PLS schemes with half-duplex relays have been extensively discovered, the issue of PLS in cooperative systems with full-duplex (FD) relays is far from being comprehensively understood. In this paper, we first present the state of the art on PLS approaches proposed for FD cooperative systems. We then provide a case study in which a source-based jamming scheme is proposed to enhance the secrecy performance of a cooperative system with an untrusted FD relay. Finally, we outline several interesting yet challenging future research problems in this topic.