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Information 2017, 8(3), 100; doi:10.3390/info8030100

Physical Layer Security and Optimal Multi-Time-Slot Power Allocation of SWIPT System Powered by Hybrid Energy

Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China
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Received: 29 June 2017 / Revised: 14 August 2017 / Accepted: 15 August 2017 / Published: 16 August 2017
(This article belongs to the Special Issue Wireless Energy Harvesting for Future Wireless Communications)
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Abstract

In this paper, a new approach is proposed to solve the constrained optimization problem of saving grid energy and increasing safety in a simultaneous wireless information and power transfer (SWIPT) system. The traditional grid energy is combined with the renewable energy to form a hybrid energy, which provides power for the system to achieve green wireless transmission. The transfer process of SWIPT system is divided into multiple time slots. The renewable energy is harvested and stored in battery at each time slot. A multi-time-slot artificial noise-assisted transmission strategy is proposed to reduce the signal to noise ratio (SNR) of eavesdropping link. A power allocation algorithm based on multi-time-slot golden section is given, which performs one-dimensional search on the power ratio of artificial noise to determine the transmit power of source node. And then the allocation algorithm is utilized to dynamically configure the harvested renewable energy for each time slot. When the battery capacity is constant, the maximum renewable energy is being used to reduce the grid power consumption. Finally, the performances of proposed schemes are evaluated by simulations in terms of various tradeoffs. View Full-Text
Keywords: renewable energy; multi-slot artificial noise; SWIPT; time slots division; power allocation renewable energy; multi-slot artificial noise; SWIPT; time slots division; power allocation
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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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Guo, D.; Li, B.; Zhao, W. Physical Layer Security and Optimal Multi-Time-Slot Power Allocation of SWIPT System Powered by Hybrid Energy. Information 2017, 8, 100.

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