scholarly journals On the Performance of Physical Layer Security in Virtual Full Duplex Non-Orthogonal Multiple Access System

2021 ◽  
Author(s):  
Weidong Guo ◽  
Yuxi Liu
Keyword(s):  
Physical Layer Security ◽  
Multiple Access ◽  
Security Analysis ◽  
Approximate Expression ◽  
Physical Layer ◽  
Full Duplex ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Cooperative Jamming ◽  
Untrusted Relay

Abstract This paper investigates physical layer security analysis of cooperative non-orthogonal multiple access (NOMA) communication system. A virtual full-duplex (VFD) relaying scheme with an untrusted amplify-and-forward (AF) half-duplex (HD) relay and a trusted decode-and-forward (DF) HD relay is used in this system to improve the spectral efficiency. In order to prevent the untrusted relay from eavesdropping, a simple and practical cooperative jamming scheme is designed to confuse the untrusted relay. The exact expressions of effective secrecy throughput (EST) for NOMA users and approximate expression of EST for non-NOMA user are derived. All theoretical results are validated by numerical simulations which demonstrate that the proposed VFD-NOMA scheme is superior to existing HD-NOMA scheme in cooperative system and jamming plays an important role for obtaining acceptable EST. In addition, simulation results shows that the best secrecy performance highly depends on the system parameters such as transmit powers and jamming signal power.

scholarly journals On the performance of physical layer security in virtual full-duplex non-orthogonal multiple access system

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Weidong Guo ◽  
Yuxi Liu
Keyword(s):  
Physical Layer Security ◽  
Multiple Access ◽  
Security Analysis ◽  
Approximate Expression ◽  
Physical Layer ◽  
Full Duplex ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Cooperative Jamming ◽  
Untrusted Relay

AbstractThis paper investigates physical layer security analysis of cooperative non-orthogonal multiple access (NOMA) communication system. A virtual full-duplex (VFD) relaying scheme with an untrusted amplify-and-forward (AF) half-duplex (HD) relay and a trusted decode-and-forward (DF) HD relay is used in this system to improve the spectral efficiency. In order to prevent the untrusted relay from eavesdropping, a simple and practical cooperative jamming scheme is designed to confuse the untrusted relay. The exact expressions of effective secrecy throughput (EST) for NOMA users and approximate expression of EST for non-NOMA user are derived. All theoretical results are validated by numerical simulations which demonstrate that the proposed VFD-NOMA scheme is superior to existing HD-NOMA scheme in cooperative system and jamming plays an important role for obtaining acceptable EST. In addition, simulation results shows that the best secrecy performance highly depends on the system parameters such as transmit powers and jamming signal power.

scholarly journals Physical Layer Security for Cooperative NOMA Networks via Nakagami-m Fading Channels

2021 ◽  
Author(s):  
Wided Hadj Alouane
Keyword(s):  
Theoretical Analysis ◽  
Fading Channels ◽  
Physical Layer Security ◽  
Multiple Access ◽  
Physical Layer ◽  
Secrecy Capacity ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Asymptotic Expressions ◽  
Relaying Systems

Abstract In this paper, we investigate the physical layer security in cooperative non-orthogonal multiple access (NOMA) networks over Nakagamim fading channels. Both amplify-and-forward (AF) and decode-and-forward (DF) protocols are studied. More particularly, closed-form exact and asymptotic expressions for strictly positive secrecy capacity are provided considering NOMA-AF and NOMA-DF relaying systems. Numerical results are presented to justify the accuracy of the obtained theoretical analysis. These results show that NOMA-AF and NOMA-DF relaying networks have a similar secrecy performance.

Decode-and-Forward vs. Amplify-and-Forward Scheme in Physical Layer Security for Wireless Relay Beamforming Networks

2020 ◽  
Vol 10 (2) ◽  
pp. 9-17
Author(s):  
Tuan Nhu Nguyen
Keyword(s):  
Wireless Networks ◽  
Physical Layer Security ◽  
Secure Communication ◽  
Physical Layer ◽  
Cooperative Relaying ◽  
Transmission Model ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Encrypt Data ◽  
Cryptographic Algorithms

Abstract— To secure communication from the sender to the receiver in wireless networks, cryptographic algorithms are usually used to encrypt data at the upper layers of a multi-tiered transmission model. Another emerging trend in the security of data transmitted over wireless networks is the physical layer security based on beamforming and interference fading  communication technology and not using cryptographic algorithms. This trend has attracted increasing concerns from both academia and industry. This paper addresses how physical layer security can protect secret data compare with the traditional cryptographic encryption and which is the better cooperative relaying scheme with the state of the art approached methods in wireless relaying beamforming network.Tóm tắt— Việc bảo mật truyền thông vô tuyến từ nơi gửi đến nơi nhận thường sử dụng các thuật toán mật mã để mã hoá dữ liệu tại các tầng phía trên trong mô hình phân lớp. Một xu hướng khác đang được quan tâm rộng rãi là bảo mật tầng vật lý dựa trên kỹ thuật truyền tin beamforming và kỹ thuật tương tác fading kênh chủ động. Xu hướng này hiện đang được thu hút cả trong giới công nghiệp và nghiên cứu. Đóng góp của bài báo này là làm rõ khả năng bảo mật tầng vật lý và so sách chúng với phương pháp bảo mật dùng kỹ thuật mật mã truyền thống. Bài báo cũng so sánh hai kỹ thuật chuyển tiếp được sử dụng chính trong bảo mật tầng vật lý cho mạng vô tuyến chuyển tiếp là Amplify-and-Forward và Decode-and-Forward.

scholarly journals Improving Physical Layer Security of Cooperative NOMA System with Wireless-Powered Full-Duplex Relaying

Information ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 279
Author(s):  
Yuan Ren ◽  
Yixuan Tan ◽  
Meruyert Makhanbet ◽  
Xuewei Zhang
Keyword(s):  
Physical Layer Security ◽  
Multiple Access ◽  
Physical Layer ◽  
Cooperative Transmission ◽  
Full Duplex ◽  
Artificial Noise ◽  
Transmission Scheme ◽  
Self Energy ◽  
Wireless Energy Harvesting ◽  
Secure Transmission

Non-orthogonal multiple access (NOMA) and wireless energy harvesting are two promising technologies for improving spectral efficiency and energy efficiency, respectively. In this paper, we study the physical layer security of a wireless-powered full-duplex (FD) relay-aided cooperative NOMA system. In particular, the source is wiretapped by an eavesdropper, and the FD relay assists the transmission from the source to a near user and a far user with self-energy recycling. To enhance the security performance of the system, we propose an artificial noise (AN)-aided cooperative transmission scheme, in which the relay emits a jamming signal to confuse the eavesdropper while receiving the signal from the source. For the proposed scheme, the ergodic secrecy sum rate (ESSR) is derived to characterize the secrecy performance and a lower bound of ESSR is obtained. Finally, numerical results verify the accuracy of the theoretical analysis of the proposed AN-aided secure transmission scheme. The superiority of the proposed scheme is also demonstrated since this scheme can achieve better secrecy performance, compared to the conventional cooperative NOMA scheme.

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