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Open AccessFeature PaperArticle

A Physical Layer Security Technique for NOMA Systems with MIMO SC-FDE Schemes

1
Koala Tech Ltd., Koala Tech LDA, 2825-182 Caparica, Portugal
2
Autonomous University of Lisbon, Universidade Autónoma de Lisboa, 1169-023 Lisboa, Portugal
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Telecommunications Institute, Instituto de Telecomunicações, 1049-001 Lisboa, Portugal
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NOVA School of Science and Technology, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
5
Project Development Maintenance Training and Consulting Ltd., Projecto Desenvolvimento Manutenção Formação e Consultadoria LDA., 1300-609 Alcântara, Portugal
*
Authors to whom correspondence should be addressed.
Electronics 2020, 9(2), 240; https://doi.org/10.3390/electronics9020240
Received: 11 December 2019 / Revised: 1 January 2020 / Accepted: 3 January 2020 / Published: 1 February 2020
(This article belongs to the Special Issue Cooperative Communications for Future Wireless Systems)
Current wireless communication systems employ Multi-Input, Multi-Output (MIMO) techniques to increase spectral efficiency, at the cost of higher hardware complexity. Most of these systems continue to employ traditional Orthogonal Multiple Access (OMA) schemes, which are suboptimal when compared to Non-Orthogonal Multiple Access (NOMA) schemes. By combining NOMA with MIMO, it is possible to achieve higher spectral efficiencies. However, security in NOMA-MIMO systems remains a problem. In this paper, we study the physical layer security issues of a power based NOMA-MIMO system with a Singular Value Decomposition (SVD) scheme, employed along with Single Carrier with Frequency Domain Equalization (SC-FDE) techniques. We consider a scenario where there is an unintended eavesdropper attempting to listen to the messages being exchanged. It is shown that the higher the channel estimate correlation between transmitter and receiver, the higher the secrecy rate, particularly for a scenario where there is a Line-Of-Sight (LOS) between all users. Therefore, power based NOMA MIMO-SVD schemes, combined with SC-FDE, can be considered efficient options for highly secure MIMO communications. View Full-Text
Keywords: MIMO; NOMA; SC-FDE; physical layer security; SVD MIMO; NOMA; SC-FDE; physical layer security; SVD
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Madeira, J.; Guerreiro, J.; Serra, H.; Dinis, R.; Montezuma, P.; Campos, L.M. A Physical Layer Security Technique for NOMA Systems with MIMO SC-FDE Schemes. Electronics 2020, 9, 240.

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