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Robust Secrecy Beamforming With Energy-Harvesting Eavesdroppers

Khandaker, MRA; Wong, K-K; (2015) Robust Secrecy Beamforming With Energy-Harvesting Eavesdroppers. IEEE Wireless Communications Letters , 4 (1) 10 - 13. 10.1109/LWC.2014.2358586. Green open access

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Abstract

This letter considers simultaneous wireless information and power transfer (SWIPT) in multiple-input-single-output downlink systems in which a multiantenna transmitter sends a secret message to a single-antenna information receiver (IR) with multiple single-antenna energy receivers (ERs). We aim to maximize the harvested energy by the ERs while maintaining the signal-to-interference-and-noise ratio (SINR) threshold at the IR and keeping the message secure from possible eavesdropping by the ERs by suppressing their SINRs. Both scenarios of perfect and imperfect channel state information at the transmitter are studied. Using semidefinite relaxation techniques, we show that there always exists a rank-one optimal solution for the IR, i.e., transmit beamforming is optimal for the IR.

Type: Article
Title: Robust Secrecy Beamforming With Energy-Harvesting Eavesdroppers
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/LWC.2014.2358586
Publisher version: http://dx.doi.org/10.1109/LWC.2014.2358586
Additional information: This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/
UCL classification: UCL
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/1457721
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