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Achievable Rate Region of Energy-Harvesting Based Secure Two-Way Buffer-Aided Relay Networks

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journal contribution
posted on 12.01.2021, 16:57 by Y Nie, X Lan, Y Liu, Q Chen, G Chen, L Fan, D Tang
This paper considered an energy-harvesting based secure two-way relay (EH-STWR) network, where two users exchanged information with the assistance of one buffer-aided relay that harvested energy from two users. To realize the confidential message exchange between two users in the presence of a potential eavesdropper, a secure bidirectional relaying scheme based on time division broadcast (TDBC) was proposed, where one user sent artificial noise to suppress the eavesdropper and another user transmitted data to the relay. A secure sum-rate maximization problem was formulated subject to average and peak transmit power constraints, data buffer and energy storage causality, and transmission mode constraints. By employing the Lyapunov optimization framework, a security-aware adaptive transmission scheme was proposed to jointly adapt transmission mode selection, power allocation, and security rate allocation according to channel/buffer/energy state information (CSI/BSI/ESI). Analysis results showed that the average achievable secrecy rate region can be significantly improved and there exists an inherent trade-off among transmission delay, requirement of transmit power consumption, and achievable secure sum-rate. Moreover, the channel condition between the energy-constrained relay and the potential eavesdropper is a critical factor on the achievable long-term average secrecy rate performance.

History

Author affiliation

School of Engineering

Version

AM (Accepted Manuscript)

Published in

IEEE Transactions on Information Forensics and Security

Volume

16

Pagination

1610-1625

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

issn

1556-6013

eissn

1556-6021

Copyright date

2020

Available date

18/11/2020

Language

en