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NOMA in Cooperative Communication Systems with Energy-Harvesting Nodes and Wireless Secure Transmission

Salem, Abdelhamid and Musavian, Leila (2021) 'NOMA in Cooperative Communication Systems with Energy-Harvesting Nodes and Wireless Secure Transmission.' IEEE Transactions on Wireless Communications, 20 (2). pp. 1023-1037. ISSN 1536-1276

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Abstract

In this paper, non-orthogonal multiple access (NOMA) in cooperative relay system is considered, where a source node communicates with a pair of energy harvesting (EH) user equipments through a multiple antennas relay node. A hybrid protocol is adopted at the relay, in which if the relay can successfully decode the signals, decode- and-forward (DF) protocol will be adopted to forward the signals to the users. Otherwise, amplify-and-forward (AF) protocol will be implemented. Assuming that the users adopt maximal ratio combining (MRC) to combine the received signals in the two cooperative phases, new explicit analytical expressions for the average sum-rate are derived when the relay works in, 1) AF mode, and 2) DF mode, in two scenarios when one user is the stronger in both cooperation phases, and when an alternative user is stronger in each phase. Then, the investigation is extended to the case where the relay is an untrusted node, and cooperative jamming technique is proposed to degrade the ability of the relay to decode the signals and enforce the relay to operate always in AF mode. For the untrusted relay scenario, new analytical expression for the average secrecy rate is derived. Monte Carlo simulations are provided to validate the analysis. The simulation results reveal that the location of the relay is the key parameter to achieve the best performance.

Item Type: Article
Uncontrolled Keywords: NOMA; cooperative communications; energy harvesting; secrecy rate; physical layer security
Divisions: Faculty of Science and Health
Faculty of Science and Health > Computer Science and Electronic Engineering, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 07 Oct 2020 14:17
Last Modified: 27 Jan 2022 16:54
URI: http://repository.essex.ac.uk/id/eprint/28853

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