Securing OFDM-Based NOMA SWIPT Systems

TL;DR

This paper proposes a physical-layer security scheme using artificial noise for OFDM-based NOMA SWIPT systems, optimizing transmission parameters to secure communications while maximizing energy transfer.

Contribution

It introduces a novel joint time-switching and power-switching scheme with optimized parameters for secure and energy-efficient NOMA SWIPT systems.

Findings

Secure communication among NOMA nodes is feasible.

Optimized parameters improve secrecy rate and energy transfer.

The scheme meets outage probability constraints.

Abstract

In this paper, we present a physical-layer security scheme that exploits artificial noise (AN) to secure the downlink legitimate communications and transfer energy to nodes operating under non-cooperative non-orthogonal multiple-access (NOMA) scenario. The nodes employ a joint time-switching and power-switching scheme to maximize the harvested energy. We provide necessary analysis and derivations for the optimization parameters and find the optimized transmission parameters that maximize the minimum secrecy rate among users while meeting constraints on minimum transferred energy and outage probabilities at the nodes through an exhaustive grid-based search. Our analysis and simulations prove the feasibility of securing the communication among NOMA nodes, while transferring energy and meeting outage probability constraints.