Cooperative non-orthogonal relaying for security enhancement in untrusted relay networks

Recently, there has been a surge of increased interest in using physical layer security to safeguard the fifth generation (5G) mobile networks. In this paper, we study the problem of secure communications in untrusted relay networks. A new nonorthogonal relaying protocol is proposed, aiming at maxim...

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Bibliographic Details
Main Authors: Lu Lv, Qiang Ni, Zhiguo Ding, Jian Chen
Format: Conference Proceeding
Language:English
Subjects:
Protocols
Relay networks (telecommunications)
Security
Transmitting antennas
Wireless communication
Online Access:Request full text
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Summary:Recently, there has been a surge of increased interest in using physical layer security to safeguard the fifth generation (5G) mobile networks. In this paper, we study the problem of secure communications in untrusted relay networks. A new nonorthogonal relaying protocol is proposed, aiming at maximizing the secrecy rate. Specifically, we allow the source and relay to transmit signals simultaneously over non-orthogonal channels, and apply successive interference cancellation at the destination to separate the multiplexed signals. We also propose two transmit antenna selection schemes to further improve security. To evaluate the secrecy performance, closed-form expressions for ergodic secrecy rate (ESR) and ESR scaling law are derived. The results show that the proposed non-orthogonal relaying protocol yields a considerable ESR improvement than conventional orthogonal relaying, despite the presence of co-channel interference. It is also revealed that the ESR scales with the average signal-to-noise ratio γ̅ and the number of available transmit antennas N t according to log (√γ̅ log N t ), thus achieving superior secrecy performance in the untrusted relay networks.
ISSN:1938-1883
DOI:10.1109/ICC.2017.7996926