Joint Relay and Jammer Selection for Secure Two-Way Relay Networks

TL;DR

This paper proposes joint relay and jammer selection algorithms in two-way cooperative networks to enhance physical layer security, demonstrating improved secrecy rates through hybrid schemes that adapt to network topology and power conditions.

Contribution

It introduces a hybrid relay and jammer selection scheme that dynamically switches modes based on network topology and power regime, improving security performance.

Findings

Jamming schemes outperform non-jamming in sparse, random networks within certain power ranges.

In clustered topologies, non-jamming schemes can be more effective than jamming.

Hybrid switching schemes further enhance secrecy rates across different scenarios.

Abstract

In this paper, we investigate joint relay and jammer selection in two-way cooperative networks, consisting of two sources, a number of intermediate nodes, and one eavesdropper, with the constraints of physical layer security. Specifically, the proposed algorithms select two or three intermediate nodes to enhance security against the malicious eavesdropper. The first selected node operates in the conventional relay mode and assists the sources to deliver their data to the corresponding destinations using an amplify-and-forward protocol. The second and third nodes are used in different communication phases as jammers in order to create intentional interference upon the eavesdropper node. Firstly, we find that in a topology where the intermediate nodes are randomly and sparsely distributed, the proposed schemes with cooperative jamming outperform the conventional non-jamming schemes within a certain transmitted power regime. We also find that, in the scenario in which the intermediate nodes gather as a close cluster, the jamming schemes may be less effective than their non-jamming counterparts. Therefore, we introduce a hybrid scheme to switch between jamming and non-jamming modes. Simulation results validate our theoretical analysis and show that the hybrid switching scheme further improves the secrecy rate.