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Secrecy Performance of Underlay Cooperative Cognitive Network Using Non-Orthogonal Multiple Access with Opportunistic Relay Selection

1
Department of Telecommunications, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava-Poruba, Czech Republic
2
Faculty of Electrical and Electronics Engineering, Ho Chi Minh City University of Technology and Education, Ho Chi Minh 700000, Vietnam
*
Author to whom correspondence should be addressed.
Symmetry 2019, 11(3), 385; https://doi.org/10.3390/sym11030385
Received: 22 January 2019 / Revised: 1 March 2019 / Accepted: 8 March 2019 / Published: 15 March 2019
In this paper, an underlay cooperative cognitive network using a non-orthogonal multiple access (UCCN-NOMA) system is investigated, in which the intermediate multiple relays help to decode and forward two signals x 1 and x 2 from a source node to two users D1 and D2, respectively, under wiretapping of an eavesdropper (E). We study the best relay selection strategies by three types of relay selection criteria: the first and second best relay selection is based on the maximum channel gain of the links R i -D 1 , R i -D2, respectively; the third one is to ensure a minimum value of the channel gains from the R i -E link. We analyze and evaluate the secrecy performances of the transmissions x 1 and x 2 from the source node to the destination nodes D1, D2, respectively, in the proposed UCCN-NOMA system in terms of the secrecy outage probabilities (SOPs) over Rayleigh fading channels. Simulation and analysis results are presented as follows. The results of the (sum) secrecy outage probability show that proposed scheme can realize the maximal diversity gain. The security of the system is very good when eavesdropper node E is far from the source and cooperative relay. Finally, the theoretical analyses are verified by performing Monte Carlo simulations. View Full-Text
Keywords: non-orthogonal multiple access (NOMA); physical layer security (PLS); cooperative communication; successive interference cancellation (SIC); decode-and-forward; cognitive radio (CR); outage probability non-orthogonal multiple access (NOMA); physical layer security (PLS); cooperative communication; successive interference cancellation (SIC); decode-and-forward; cognitive radio (CR); outage probability
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MDPI and ACS Style

Huynh, T.-P.; Ngoc Son, P.; Voznak, M. Secrecy Performance of Underlay Cooperative Cognitive Network Using Non-Orthogonal Multiple Access with Opportunistic Relay Selection. Symmetry 2019, 11, 385. https://doi.org/10.3390/sym11030385

AMA Style

Huynh T-P, Ngoc Son P, Voznak M. Secrecy Performance of Underlay Cooperative Cognitive Network Using Non-Orthogonal Multiple Access with Opportunistic Relay Selection. Symmetry. 2019; 11(3):385. https://doi.org/10.3390/sym11030385

Chicago/Turabian Style

Huynh, Tan-Phuoc, Pham Ngoc Son, and Miroslav Voznak. 2019. "Secrecy Performance of Underlay Cooperative Cognitive Network Using Non-Orthogonal Multiple Access with Opportunistic Relay Selection" Symmetry 11, no. 3: 385. https://doi.org/10.3390/sym11030385

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