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IEEE Vehicular Technology Conference

Energy Beamforming for Full-Duplex Wireless Powered Communication in Presence of Eavesdropper

Juhwan Seo, Jae Hong Lee

Published Sep 1, 2017• 3 citations
Publisher

Abstract

In this paper, we propose an optimal beamforming scheme for secure communication in a full duplex (FD) wireless powered communication (WPC) system. In the proposed scheme, the power beacon transmits an energy signal to a source which acts as a jamming signal to an eavesdropper. We formulate an optimization problem to find an optimal beamforming for the power beacon and propose an algorithm to solve the problem. Simulation results show the secrecy performance of FD WPC system with the proposed beamforming scheme.

DOI
10.1109/vtcfall.2017.8287911

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In this paper, we propose an optimal beamforming scheme for secure communication in a full duplex (FD) wireless powered communication (WPC) system. In the proposed scheme, the power beacon transmits an energy signal to a source which acts as a jamming signal to an eavesdropper. We formulate an optimization problem to find an optimal beamforming for the power beacon and propose an algorithm to solve the problem. Simulation results show the secrecy performance of FD WPC system with the proposed beamforming scheme.
In this letter, we study a novel multi-antenna wireless powered communication (WPC) system consisting of an energy source (ES), a full-duplex self-energy recycling information source (IS), an information receiver (IR), and an energy receiver (ER) (potential eavesdropper). The energy-constrained IS, powered by ES, sends the confidential information to IR over the wiretap channel. Our goal is to maximize the secrecy rate for IR by jointly optimizing the energy and information beamforming vectors, under the constraints of the transmit power at ES and IS and the harvested energy at ER. To solve the formulated non-convex problem, a partial Lagrange dual method coupled with two-stage optimization method is proposed, which derives the optimal solution in semi-closed form. Numerical results show the superiority of our proposed design compared with the existing schemes.
In this paper, we consider a simultaneous wireless information and power transfer (SWIPT) system with a full-duplex (FD) receiver and an energy-harvesting (EH) eavesdropper. The FD receiver decodes the information that should be kept secret from the EH eavesdropper and sends jamming signals to degrade the eavesdropper simultaneously using the energy it harvests from the source. An optimization problem is formulated to maximize the worst-case secrecy rate taking into account the eavesdropper channel uncertainties. A SDR-based method is proposed to solve this problem. Numerical results are given to show the superiority of our proposed scheme.
We investigate the secrecy performance and energy-efficiency trade-offs associated to the secure communication between a full-duplex (FD) power beacon (PB) and an energy harvesting (EH) device, in the presence of an eavesdropper. Specifically, we analyze the feasibility of a jamming strategy implemented at the FD-PB under several practical constraints, such as imperfect self-interference (SI) cancellation, EH non-linearity, channel aging and energy-information correlation. The design of the optimal time-splitting factor for the simultaneous wireless information and power transfer (SWIPT) strategy, the adequacy of different beamforming strategies for proper system operation, and the impact of channel correlation between the energy and information transmission phases in SWIPT are thoroughly discussed. Results indicate that under practical constraints such as EH non-linearity and imperfect SI cancellation, the transmit powers at the FD-PB for the generation of energy and jamming signals are the key parameters to be optimized from both points of view: secrecy and energy efficiency. We also verify the positive impact of correlation between the energy and information links in wireless power transfer systems, from a physical layer security perspective.
This paper studies a wireless powered relaying (WPR) system in which a source transmits an information signal to a destination with the help of an energy constrained relay in the presence of an eavesdropper. This work considers a scenario in the full-duplex WPR system where the information transmission/reception and the energy harvesting are performed simultaneously at the relay. We first derive an achievable secrecy rate of the system and formulate a joint optimization problem of artificial-noise-aided secure beamforming to maximize the achievable secrecy rate. Then, an efficient semi-definite relaxation (SDR) based algorithm is proposed to obtain the optimal beamforming. Furthermore, we also propose three suboptimal beamforming but low computational complexity schemes. Comparisons are carried out among the performances of the proposed optimal and suboptimal schemes.
In this paper, we consider a secrecy wireless powered communication network, where an information source (IS) transmits message to a legitimate information receiver (IR) with the energy it harvests from the energy source (ES) and a full-duplex (FD) active eavesdropper (AE) performs eavesdropping and jamming simultaneously with the energy it harvests from the ES. With a goal to maximize the achievable secrecy rate, we jointly optimize the energy beamforming and the artificial noise (AN) beamforming at the ES, the information beamforming at the IS and the energy transfer time at the ES. Numerical results are given to show the superiority of our proposed scheme.
This paper focuses on information security in an energy harvesting relay system, in which confidential signals are transmitted from a source node to its desired destination with the assistance of one full-duplex (FD) relay. To empower simultaneous wireless information and power transfer, the time-switching (TS) protocol is embraced and the energy-limited FD relay node is powered by energy signals emitted by the source node. With the obtained statistical eavesdropper channel state information (CSI), the ergodic secrecy rate and its approximate expression are derived. As the objective is maximizing the ergodic secrecy rate performance, source beamformers, TS coefficient and the power control factor at FD relay are jointly optimized. To tackle the framed non-convex problem, an alternative method is hence proposed, and closed-form solutions for beamformers, TS coefficient and power control factor are derived iteratively. Besides, the convergence of our proposed algorithm can be guaranteed and is also theoretically proved. Simulation results demonstrate that our iterative algorithm is effective and improves the system secrecy rate considerably.