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Lookup NU author(s): Weichen Xiang, Dr Martin JohnstonORCiD, Dr Stephane Le Goff
This is the authors' accepted manuscript of an article that has been published in its final definitive form by IEEE, 2018.
For re-use rights please refer to the publisher's terms and conditions.
IEEE We discuss the design rules of an energy-efficient wireless wiretap channel in this paper. On the transmitter side, we investigate the optimal power control policy for secrecy rate maximization over wiretap channels with the bit-interleaved coded modulation (BICM) scheme. On the receiver side, an energy harvesting (EH) algorithm is used to collect wireless signal energy without degrading the secrecy rate performance. These objectives are challenging as the closed-form solution to the mutual information of finite-alphabet input schemes remains unknown. In this paper, we derive a closed-form relationship between the secrecy rate and the signal-to-noise ratio (SNR) by transforming the SNR from the linear domain to the logarithm domain. The optimal power control policy (PCP) can be easily obtained by exhaustive search in a small interval, whereas the traditional search is performed over the entire SNR range. We also propose a sub-optimal PCP algorithm that significantly reduces the search complexity with only a minor performance loss. The optimal power splitting ratio (PSR) is studied to save energy while achieving the target secrecy rate. We show that if the transmission power is too high, the receiver is unable to simultaneously harvest energy from the wireless signals and achieve the target secrecy rate.erval, whereas the traditional search is performed over the entire SNR range. We also propose a sub-optimal PCP algorithm that significantly reduces the search complexity with only a minor performance loss. The optimal power splitting ratio (PSR) is studied to save energy while achieving the target secrecy rate. We show that if the transmission power is too high, the receiver is unable to simultaneously harvest energy from the wireless signals and achieve the target secrecy rate.
Author(s): Xiang W, Johnston M, Le Goff S
Publication type: Article
Publication status: Published
Journal: IEEE Transactions on Information Forensics and Security
Year: 2018
Volume: 13
Issue: 2
Pages: 318-326
Print publication date: 01/02/2018
Online publication date: 04/09/2017
Acceptance date: 02/04/2016
Date deposited: 16/10/2017
ISSN (print): 1556-6013
ISSN (electronic): 1556-6021
Publisher: IEEE
URL: https://doi.org/10.1109/TIFS.2017.2749161
DOI: 10.1109/TIFS.2017.2749161
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