Secure Full-Duplex Two-Way Relaying for SWIPT

TL;DR

This paper proposes a secure full-duplex MIMO relay system for bi-directional SWIPT, optimizing artificial noise and power allocation to enhance security and efficiency, demonstrated through simulation results.

Contribution

It introduces an optimal joint design of ZF matrix and AN covariance at the relay for secure SWIPT with full-duplex MIMO relaying, using an SDP-based alternating algorithm.

Findings

The proposed algorithm effectively optimizes secure communication parameters.

Simulation results confirm the algorithm's superiority in security and power efficiency.

The method successfully mitigates residual self-interference in full-duplex relaying.

Abstract

This letter studies bi-directional secure information exchange in a simultaneous wireless information and power transfer (SWIPT) system enabled by a full-duplex (FD) multiple-input multiple-output (MIMO) amplify-and-forward (AF) relay. The AF relay injects artificial noise (AN) in order to confuse the eavesdropper. Specifically, we assume a zeroforcing (ZF) solution constraint to eliminate the residual self-interference (RSI). As a consequence, we address the optimal joint design of the ZF matrix and the AN covariance matrix at the relay node as well as the transmit power at the sources. We propose an alternating algorithm utilizing semi-definite programming (SDP) technique and one-dimensional searching to achieve the optimal solution. Simulation results are provided to demonstrate the effectiveness of the proposed algorithm.