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Robust AN-Aided Secure Beamforming and Power Splitting in Wireless-Powered AF Relay Networks

Niu, H; Zhang, B; Wong, KK; Chu, Z; Zhou, F; (2018) Robust AN-Aided Secure Beamforming and Power Splitting in Wireless-Powered AF Relay Networks. IEEE Systems Journal 10.1109/JSYST.2018.2828224. (In press). Green open access

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Abstract

In this letter, we investigate the secrecy design in a wireless-powered amplify-and-forward relay network, where the relay is energy constrained and powered by the signal from the transmitter. Specifically, by adopting the power splitting (PS) scheme at the relay, we investigate the worst-case secrecy rate maximization by jointly designing the relay beamforming matrix, artificial noise covariance, and the PS ratio. However, the formulated problem is highly nonconvex due to the secrecy rate function and the dynamic relay power constraint. By exploiting the hidden convexity, we transform the original problem to a solvable reformulation via the successive convex approximation and constrained concave–convex procedure, which can provide a high-level approximated beamforming solution. Then, an iterative algorithm is proposed to obtain the solution. Numerical results showed the effectiveness of the proposed robust scheme.

Type: Article
Title: Robust AN-Aided Secure Beamforming and Power Splitting in Wireless-Powered AF Relay Networks
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/JSYST.2018.2828224
Publisher version: http://dx.doi.org/10.1109/JSYST.2018.2828224
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Relay networks (telecommunications), Robustness, Array signal processing, Communication system security, Wireless communication, Covariance matrices
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10050928
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