Salem, A;
Musavian, L;
(2021)
NOMA in Cooperative Communication Systems With Energy-Harvesting Nodes and Wireless Secure Transmission.
IEEE Transactions on Wireless Communications
, 20
(2)
pp. 1023-1037.
10.1109/TWC.2020.3030133.
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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.
| Type: | Article |
|---|---|
| Title: | NOMA in Cooperative Communication Systems With Energy-Harvesting Nodes and Wireless Secure Transmission |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TWC.2020.3030133 |
| Publisher version: | https://doi.org/10.1109/TWC.2020.3030133 |
| Language: | English |
| Additional information: | © 2021 IEEE. This work is licensed under a Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/). |
| Keywords: | NOMA, cooperative communications, energy harvesting, secrecy rate, physical layer security |
| UCL classification: | UCL 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/10124576 |
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