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Secrecy Outage Probability of Energy-Harvesting Cooperative NOMA Transmissions With Relay Selection

Salem, A; Musavian, L; Jorswieck, EA; Aissa, S; (2020) Secrecy Outage Probability of Energy-Harvesting Cooperative NOMA Transmissions With Relay Selection. IEEE Transactions on Green Communications and Networking , 4 (4) pp. 1130-1148. 10.1109/TGCN.2020.2999815. Green open access

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Abstract

hree relay selection techniques, aiming at achieving secure non-orthogonal multiple access in cooperative energy-harvesting (EH) communications, are proposed and compared. In the cooperative relaying system, the source node communicates with multiple users through amplify-and-forward EH relays in the presence of a passive eavesdropper. The relay selection is a two-stage strategy, where the first stage aims at achieving the users’ target data rate, and the second aims at optimizing the secrecy outage probability. New explicit analytical expressions for the secrecy outage probability are derived for three operating scenarios: i) when the channel state information (CSI) of the eavesdropper is unknown, and a two-stage conventional relay selection scheme is considered, ii) when CSI of the eavesdropper is known, and a two-stage optimal relay selection scheme is used, and iii) when multiple relays participate in forwarding the signal to the end users. Monte-Carlo simulations are provided to confirm the derivations, and the effects of the main system parameters on its secrecy are investigated. In particular, it is shown that the optimal relay selection scheme outperforms the conventional and the multiple-relays schemes in terms of secrecy outage probability, and that this superiority becomes more obvious when the number of the relays increases.

Type: Article
Title: Secrecy Outage Probability of Energy-Harvesting Cooperative NOMA Transmissions With Relay Selection
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TGCN.2020.2999815
Publisher version: https://doi.org/10.1109/TGCN.2020.2999815
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: NOMA, cooperative communications, energy harvesting, secrecy outage probability, physical-layer security
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10116891
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