Partial relay selection for secure cooperative NOMA networks

Autor: Wided Hadj Alouane, Chan-Wang Park
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Journal of Information and Telecommunication, Pp 1-18 (2024)
Druh dokumentu: article
ISSN: 24751839
2475-1847
2475-1839
DOI: 10.1080/24751839.2024.2422145
Popis: In this paper, we address the physical layer security (PLS) of multi-relay non-orthogonal multiple access (NOMA) schemes with partial relay selection (PRS) using decode-and-forward (DF) and amplify-and-forward (AF) protocols. We propose a partial relay scheme aiming to select the best relay according to the highest signal-to-noise ratio (SNR) of the first link. We derive new exact and asymptotic expressions for strictly positive secrecy capacity (SPSC) and secrecy outage probability (SOP) considering Rayleigh fading channels. Numerical results demonstrate that AF and DF provide a similar system performance. They prove that partial relay selection improves SPSC and reduces SOP when the relays are near the legitimate receiver. Numerical results also reveal that the performance boosts for a high number of relays even for the high SNR of the eavesdropper channel. The secure NOMA system with PRS is capable of providing better secrecy performance than the secure NOMA system with random relay selection. Asymptotic results show that the use of multiple relays does not affect the system performance.
Databáze: Directory of Open Access Journals