Joint Power Splitting and Secure Beamforming Design in the Multiple Non-regenerative Wireless-powered Relay Networks

TL;DR

This paper addresses physical-layer security in multiple wireless-powered relay networks by jointly optimizing power splitting and beamforming to maximize secrecy rate, using an efficient algorithm that converges to a local optimum.

Contribution

It introduces a novel joint optimization algorithm for power splitting and beamforming in secure relay networks, improving secrecy performance.

Findings

The proposed algorithm outperforms benchmark methods.

It effectively maximizes the secrecy rate.

The algorithm converges efficiently to a local optimum.

Abstract

The physical-layer security issue in the multiple non-regenerative wireless-powered relay (WPR) networks is investigated in this letter, where the idle relay is treated as a potential eavesdropper. To guarantee secure communication, the destination-based artificial noise is sent to degrade the receptions of eavesdroppers, and it also becomes a new source of energy powering relays to forward the information with power splitting (PS) technique. We propose an efficient algorithm ground on block-wise penalty function method to jointly optimize PS ratio and beamforming to maximize the secrecy rate. Despite the nonconvexity of the considered problem, the proposed algorithm is numerically efficient and is proved to converge to the local optimal solution. Simulation results demonstrate that the proposed algorithm outperforms the benchmark method.