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Sensors 2018, 18(2), 331; doi:10.3390/s18020331

Secure Transmission of Cooperative Zero-Forcing Jamming for Two-User SWIPT Sensor Networks

College of Communications Engineering, Army Engineering University of PLA, No. 88 Houbiaoying, Qinhuai District, Nanjing 210007, China
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Received: 3 January 2018 / Revised: 21 January 2018 / Accepted: 22 January 2018 / Published: 24 January 2018
(This article belongs to the Special Issue Sensor Networks for Collaborative and Secure Internet of Things)
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Abstract

In this paper, the secrecy performance of the two-user simultaneous wireless information and power transfer (SWIPT) sensor networks is studied and a novel secure transmission scheme of cooperative zero-forcing (ZF) jamming is proposed. The two sensors opportunistically conduct the SWIPT and cooperative ZF jamming, respectively, where the energy required for jamming the eavesdropper is provided by the SWIPT operation so as to keep the energy balance at the sensors in the long run. By deriving the exact closed-form expressions of the secrecy outage probability and the secrecy throughout, we provide an effective approach to precisely assess the impacts of key parameters on the secrecy performance of the system. It has been shown that the secrecy outage probability is a monotonically increasing function of the growth of secrecy rate ( R s ), and a monotonically decreasing function of the increase of the transmit signal-to-noise ratio ( γ S ), and energy conversion efficiency ( η ). Furthermore, the secrecy throughput could be enhanced when η increases, which becomes especially obvious when a large γ S is provided. Moreover, the existence of an optimum R s maximizing the secrecy throughput is depicted, which also grows with the increase of γ S . Simulations are provided for the validation of the analysis. View Full-Text
Keywords: physical layer security; zero-forcing jamming; secrecy outage probability; secrecy throughput; wireless sensor networks physical layer security; zero-forcing jamming; secrecy outage probability; secrecy throughput; wireless sensor networks
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tang, X.; Cai, Y.; Yang, W.; Yang, W.; Chen, D.; Hu, J. Secure Transmission of Cooperative Zero-Forcing Jamming for Two-User SWIPT Sensor Networks. Sensors 2018, 18, 331.

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