Exploiting Secrecy Performance of Uplink NOMA in Cellular Networks

Nguyen, Minh-Sang Van; Do, Dinh‐Thuan; Afghah, Fatemeh; Islam, S. M. Riazul; Le, Anh‐Tu

doi:10.1109/access.2021.3092830

Cited by 8 publications

(2 citation statements)

References 49 publications

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“…In specifically, the probability of having a strictly positive secrecy capacity (SPSC) is obtained in a closed-form expression. In [26], the authors have studied how well an uplink NOMA preserved information private for both single antenna (SA) and multiple antenna (MA) users. Also, the authors have analyzed the PLS performance in terms of SOP and SPSC.…”

Section: B Motivations and Contributionsmentioning

confidence: 99%

Investigations on Secrecy Performance of Downlink Overlay CR-NOMA System With SIC Imperfections

Godugu,

Vappangi

2024

IEEE Access

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Cognitive radio (CR) and non-orthogonal multiple access (NOMA) are two technologies witnessed to offer tremendous possibilities for the next generation wireless networks to maximise their usage of available spectrum. In this work, we evaluate the performance of a downlink overlay secure CR-NOMA system while the secondary transmitter (ST) is used as a decode-and-forward (DF) relay to assist the primary transmitter (PT) to transmit information to the destination i.e., primary user (PU), while covertly transmitting its own information to the secondary user (SU) against the eavesdropper (Eve) of PT. The secrecy performance comparison between two users i.e., PU and SU are obtained under perfect and imperfect successive interference cancellation (SIC), respectively. Furthermore, this paper investigates the secrecy performance comparison between the proposed overlay downlink CR-NOMA system comprising of single antenna (SA) and multiple antennas (MA) in terms of various performance metrics such as secrecy sum rate (SSR), the average secrecy rate (ASR), the average secrecy sum rate (ASSR), strictly positive secrecy rate (SPSC) and secrecy outage probability (SOP). It is to be noted that in our proposed system, MAs are equipped at both PT and ST with the main purpose to provide cooperative diversity and we employ both maximal ratio combining (MRC) and selection combining (SC) diversity techniques for processing the received signals at the PU/Eve which further improves the system's capacity and enhances the secrecy performance. In addition, for characterizing the secrecy performance of the proposed overlay CR-NOMA network, we present thoroughly the derivations of novel closed-form analytical expressions of the performance metrics such as SOP, SPSC and the ASR by taking into account both perfect SIC (pSIC) and imperfect SIC (ipSIC) scenarios. Based on the analytical frameworks, the numerical and simulation results are obtained under different network parameters. Towards this end, the outcomes of the simulation are shown to prove both the reliability of the mathematical analysis and the accuracy of the suggested technique.INDEX TERMS Non-orthogonal multiple access, physical layer security, overlay cognitive radio, secrecy rate, average secrecy rate, strictly positive secrecy rate.

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Section: B Motivations and Contributionsmentioning

confidence: 99%

Investigations on Secrecy Performance of Downlink Overlay CR-NOMA System With SIC Imperfections

Godugu,

Vappangi

2024

IEEE Access

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“…Similarly, for cooperative NOMA networks, closed-form expressions for secrecy outage probability for different relay selection schemes were investigated in [34]. In the presence of an eavesdropper, a secret transmission of uplink NOMA with a single antenna and multi-antenna users was examined in [35]. The authors studied the system's secrecy outage probability (SOP) and strictly positive secrecy capacity (SPSC) and derived the closed-form expressions.…”

Section: Introductionmentioning

confidence: 99%

Secrecy Performance Analysis of Cooperative Nonorthogonal Multiple Access in IoT Networks

et al. 2022

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Different system models utilizing Non-orthogonal multiple access (NOMA) have been successfully studied to meet the growing capacity demands of the Internet of Things (IoT) devices for the next-generation networks. However, analyzing the antieavesdropping for NOMA systems under different scenarios and settings still needs further exploration before it can be practically deployed. Therefore, in this paper, we study the secrecy performance of a cooperative NOMA system in IoT networks where two source nodes communicate with their respective destination nodes via a common relay in the presence of an eavesdropper. Specifically, two source node sends their data in parallel over the same frequency band to the common relay node using uplink NOMA. Then, the relay node forwards the decoded symbols to the respective destination nodes using downlink NOMA in the presence of an eavesdropper. To enhance the security performance of the considered system, we study and propose an artificial noise (AN)aided scheme in which the two destination nodes emit a jamming signal to confuse the eavesdropper while receiving the signal from the common relay node. We also study the effect of NOMA power allocation, perfect successive interference cancellation (pSIC), and imperfect SIC (ipSIC) on the considered system. Analytical expressions for the Ergodic capacity, Ergodic secrecy sum rate (ESSR), and secrecy outage probability (SOP) are mathematically derived and verified with the simulation results. Our results demonstrate that a significantly higher ESSR and lower SOP of the system can be attained compared to a conventional NOMA system without a destination-assisted jamming signal scheme.

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Secure transmission in backhaul NOMA systems: A physical layer security design with untrusted user and eavesdropper

Le¹,

Do²,

Vozňák³

2022

Digital Communications and Networks

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Exploiting Secrecy Performance of Uplink NOMA in Cellular Networks

Cited by 8 publications

References 49 publications

Investigations on Secrecy Performance of Downlink Overlay CR-NOMA System With SIC Imperfections

Investigations on Secrecy Performance of Downlink Overlay CR-NOMA System With SIC Imperfections

Secrecy Performance Analysis of Cooperative Nonorthogonal Multiple Access in IoT Networks

Secure transmission in backhaul NOMA systems: A physical layer security design with untrusted user and eavesdropper

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