Cooperative relay transmission under physical layer security for non-orthogonal networks


Salem, Mohammed A. and Abd. Aziz, Azlan and Alias, Mohamad Yusoff (2020) Cooperative relay transmission under physical layer security for non-orthogonal networks. Journal of Communications, 15 (8). pp. 633-638. ISSN 1796-2021

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In this paper, the secrecy performance for a downlink cooperative non-orthogonal multiple access (NOMA) communication system is studied under two cases. In the first case, the presence of an untrusted user is studied. While, the presence of an eavesdropper node is considered in the second case. The base station transmits superimposed information signals to the half-duplex two-way relay node. The relay amplifies-and-forwards the received signal towards the users. This paper studies the effectiveness of two factors on the secrecy performance in terms of secrecy capacity. these factors are the power allocated for each user, and the distance between the untrusted user and the cooperative relay node with respect to the strong user. Moreover, this paper proposes the shared jamming signal strategy in order to enhance the physical layer security of the cooperative NOMA in the presence of an eavesdropper node. Furthermore, simulations of the secrecy capacity are presented and compared with a conventional scheme based on null-steering jamming scheme. Based on the result the proposed technique outperforms the conventional technique in terms the of secrecy capacity.

Item Type: Article
Uncontrolled Keywords: Multiple access protocols (Computer network protocols), Physical Layer Security (PLS), cooperative relay transmission, Non-orthogonal Multiple Access (NOMA), secrecy capacity
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television
Divisions: Faculty of Engineering (FOE)
Faculty of Engineering and Technology (FET)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 15 Dec 2020 12:44
Last Modified: 21 Dec 2020 06:10


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