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

Abstract

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.

Residual Energy Analysis in Cognitive Radios with Energy Harvesting UAV under Reliability and Secrecy Constraints

“…The connection outage probability is defined as the probability that the spectral efficiency (channel capacity) of the UAV-SR link (C CR ) falls below the target transmission rate (R S1 ) [27]. Thus, the connection outage probability is expressed as…”

Spatial-Temporal-DBSCAN-Based User Clustering and Power Allocation for Sum Rate Maximization in Millimeter-Wave NOMA Systems

“…The key concept of NOMA is successive interference cancellation (SIC) to decode transmitted messages and suppress interference at the receiver side [3]. Moreover, NOMA can also improve the throughput and secrecy performance in wireless communications [4,5].…”

Performance Comparison between Fountain Codes-Based Secure MIMO Protocols with and without Using Non-Orthogonal Multiple Access

“…In [ 38 ], the source performs the jamming operation to enhance the security for dual-hop relaying networks using NOMA. In [ 39 , 40 ], secure NOMA transmission strategies in CRNs were proposed and analyzed. In [ 41 ], the trade-off between security and reliability of cooperative cognitive NOMA systems was evaluated via SOP and connection outage probability (COP).…”

“…Until now, there have been many published works concerned with performance analysis of diversity based secure communication using MIMO techniques, e.g., [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ], and cooperative relaying methods [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. However, to the best of our knowledge, several existing literatures studying secure transmission protocols using FCs have been reported.…”