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Article

Robust Beamforming Design for Secure V2X Downlink System with Wireless Information and Power Transfer under a Nonlinear Energy Harvesting Model

1
School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
2
National Communications Research Laboratory, Southeast University, Nanjing 210096, China
3
School of Computer Science and Educational Software, Guangzhou University, Guangzhou 510006, China
4
School of Information Engineering, Henan University of Science and Technology, Luoyang 471023, China
*
Authors to whom correspondence should be addressed.
Sensors 2018, 18(10), 3294; https://doi.org/10.3390/s18103294
Received: 1 September 2018 / Revised: 24 September 2018 / Accepted: 28 September 2018 / Published: 30 September 2018
(This article belongs to the Special Issue Enhances in V2X Communications for Connected Autonomous Vehicles)
Vehicle to everything (V2X) has been deemed a promising technology due to its potential to achieve traffic safety and efficiency. This paper considers a V2X downlink system with a simultaneous wireless information and power transfer (SWIPT) system where the base station not only conveys data and energy to two types of wireless vehicular receivers, such as one hybrid power-splitting vehicular receiver, and multiple energy vehicular receivers, but also prevents information from being intercepted by the potential eavesdroppers (idle energy vehicular receivers). Both the base station and the energy vehicular receivers are equipped with multiple antennas, whereas the information vehicular receiver is equipped with a single antenna. In particular, the imperfect channel state information (CSI) and the practical nonlinear energy harvesting (EH) model are taken into account. The non-convex optimization problem is formulated to maximize the minimum harvested energy power among the energy vehicular receivers satisfying the lowest harvested energy power threshold at the information vehicular receiver and secure vehicular communication requirements. In light of the intractability of the optimization problem, the semidefinite relaxation (SDR) technique and variable substitutions are applied, and the optimal solution is proven to be tight. A number of results demonstrate that the proposed robust secure beamforming scheme has better performance than other schemes. View Full-Text
Keywords: SWIPT; nonlinear energy harvesting model; secure vehicular communication; semidefinite relaxation SWIPT; nonlinear energy harvesting model; secure vehicular communication; semidefinite relaxation
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MDPI and ACS Style

Li, S.; Li, C.; Tan, W.; Ji, B.; Yang, L. Robust Beamforming Design for Secure V2X Downlink System with Wireless Information and Power Transfer under a Nonlinear Energy Harvesting Model. Sensors 2018, 18, 3294. https://doi.org/10.3390/s18103294

AMA Style

Li S, Li C, Tan W, Ji B, Yang L. Robust Beamforming Design for Secure V2X Downlink System with Wireless Information and Power Transfer under a Nonlinear Energy Harvesting Model. Sensors. 2018; 18(10):3294. https://doi.org/10.3390/s18103294

Chicago/Turabian Style

Li, Shidang, Chunguo Li, Weiqiang Tan, Baofeng Ji, and Luxi Yang. 2018. "Robust Beamforming Design for Secure V2X Downlink System with Wireless Information and Power Transfer under a Nonlinear Energy Harvesting Model" Sensors 18, no. 10: 3294. https://doi.org/10.3390/s18103294

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