Full-Duplex Relay with Jamming Protocol for Improving Physical-Layer Security

TL;DR

This paper introduces a full-duplex relay with jamming protocol that enhances physical-layer security by simultaneously transmitting data and jamming signals, significantly improving secrecy rates against eavesdroppers.

Contribution

It proposes a novel FD-Relay with jamming protocol, derives achievable secrecy rates, and develops an adaptive power allocation algorithm for multi-carrier scenarios.

Findings

FDJ outperforms traditional HD relay in secrecy rate.

Achievable secrecy rates are derived for different eavesdropper types.

An iterative optimization algorithm improves power allocation for secrecy maximization.

Abstract

This paper proposes a jointly cooperative relay and jamming protocol based on full-duplex (FD) capable relay to increase the source-destination secrecy rate in the presence of different types of eavesdroppers. In this so called \textit{FD-Relay with jamming (FDJ)} protocol, the FD-Relay, first, simultaneously receives data and sends jamming to the eavesdropper, and, then, forwards the data, while the source jams the eavesdropper. Achievable secrecy rates of the proposed FDJ in presence of different eavesdropper types and self-interference (SI) are derived and compared with those of the traditional half-duplex (HD) relay. The adaptive power allocation for secrecy rate maximization in a multi-carrier scenario for both proposed FDJ and HD-Relay is formulated as a non-convex optimization problem and corresponding iterative solution algorithm is developed using the difference-of-two-concave-functions (DC) programming technique. The simulation results confirm that FDJ offers significant improvements in the secrecy rate over the HD-Relay.