Energy Harvesting Jammer Enabled Secure Communication for Cooperative NOMA Systems

Download PDF
View References
Request Permissions
Save to
Alerts

Abstract:This paper investigates physical layer security of cooperative NOMA in a severe scenario where there is no direct link from the source to far destination while the direct...View more

Metadata

Abstract:

This paper investigates physical layer security of cooperative NOMA in a severe scenario where there is no direct link from the source to far destination while the direct link between the eavesdropper and source exists. An energy harvesting (EH) jammer aided cooperative NOMA (namely EJCN) scheme is proposed to enable secure communications for the scenario. In particular, the EH jammer can opportunistically harvest energy from ambient radio frequency (RF) signals without occupying special time and power resources, and the harvested energy is exploited to emit the artificial noise (AN) for confusing the eavesdropper. The closed-form expressions of secrecy throughput achieved by the EJCN scheme are derived to evaluate the secrecy performance for the scenario. An iterative algorithm is presented to obtain the optimal codeword rate. The analysis and simulation results show that the EJCN scheme can achieve better secrecy performance than conventional transmission scheme without an EH jammer, indicating the superiority of the proposed scheme. In addition, the codeword rate of users should be carefully designed to maximize the secrecy throughput.

Published in: 2020 International Conference on Wireless Communications and Signal Processing (WCSP)

Date of Conference: 21-23 Oct. 2020

Date Added to IEEE Xplore: 28 December 2020

ISBN Information:

ISSN Information:

INSPEC Accession Number: 20326091

DOI: 10.1109/WCSP49889.2020.9299881

Conference Location: Nanjing, China

Funding Agency:

Contents

I. Introduction

Non-orthogonal multiple access (NOMA) has been considered as a promising multiple access technique to significantly boost the spectral efficiency in the beyond fifth-generation (5G) wireless networks [1]–[5]. Unlike conventional orthogonal multiple access (OMA) techniques, such as frequency division multiple access, time division multiple access and code division multiple access, NOMA can serve multiple users simultaneously in the same resource block (e.g.,time/frequency/code). In particular, two dominant NOMA solutions have been proposed, namely code-domain NOMA and power-domain NOMA [3]. In this paper, we focus our attention on power-domain NOMA, that utilizes the superposition coding at the transmitter side and the successive interference cancellation (SIC) at the receiver side to enable multiple users to be served in the same resource block but with different power levels.