Power allocation and scheduling for SWIPT systems with non-linear energy harvesting model

Boshkovska, Elena; Morsi, Rania; Ng, Derrick Wing Kwan; Schober, Robert

doi:10.1109/icc.2016.7511403

Cited by 65 publications

(48 citation statements)

References 16 publications

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“…Therefore, the assumption of a linear EH model in the literature may not be able to incorporate the nonlinear characteristics in practical EH scenarios [24]. Recently, the practical parametric non-linear EH model has been considered in [24]. In contrast to the linear EH model, the non-linear one includes the characteristics of practical RF-EH conversion circuits.…”

Section: Introductionmentioning

confidence: 99%

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Robust Beamforming for AN Aided MISO SWIPT System with Unknown Eavesdroppers and Non-Linear EH Model

Zhang

Cumanan

et al. 2018

2018 IEEE Globecom Workshops (GC Wkshps)

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This work studies a beamforming design for downlink transmission of a multi-user multiple-input single-output (MISO) system where each legitimate user employs a power splitting (PS) based simultaneous wireless information and power transfer (SWIPT) technique. The transmitter intends to send confidential information to its legitimate users in the presence of purely unknown eavesdroppers. Since the transmitter does not have any knowledge of the eavesdroppers' channel state information (CSI), we consider an artificial noise (AN) approach to establishing secure communication. This beamforming design is developed by maximizing the AN power to interfere with the eavesdropper as much as possible. Based on the assumption of imperfect CSI of legitimate users at the transmitter, two robust design approaches for the joint beamforming and PS ratio have been studied to maximize the AN power under both energy harvesting (EH) and signal-to-interference-plus-noise ratio (SINR) requirements at each legitimate user. In the first robust design, we consider the bounded channel uncertainties, and employ semidefinite relaxation (SDR) and a linear matrix inequality (LMI) representation to transform the original problem into a semidefinite program (SDP). In the second robust design, we consider the statistical channel uncertainties, and show that the proposed problem can be reformulated into another form of SDP through both SDR and Bernstein-type inequality. In addition, the non-linear energy harvesting (EH) model is incorporated in this work as it could reflect the characteristics of practical radio frequency(RF)-EH conversion circuit. Simulation results have been provided to demonstrate the performance of our proposed robust designs.

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Section: Introductionmentioning

confidence: 99%

“…In contrast to the linear EH model, the non-linear one includes the characteristics of practical RF-EH conversion circuits. A power allocation strategy for a SWIPT system with non-linear EH model is proposed in [24], whereas EH maximization is investigated with a non-linear EH model for multiple antenna systems in [2], [25]- [28].…”

Section: Introductionmentioning

confidence: 99%

Robust Beamforming for AN Aided MISO SWIPT System with Unknown Eavesdroppers and Non-Linear EH Model

Zhang

Cumanan

et al. 2018

2018 IEEE Globecom Workshops (GC Wkshps)

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“…As a result, the RFto-DC conversion efficiency depends on the input power level. To capture the dynamics of the RF-to-DC conversion efficiency for different input power levels, in this paper, the non-linear model is adopted [5][6][7]. The output DC power (harvested power) of the RF-EH circuits at the s-th ER is…”

Section: Non-linear Eh Modelmentioning

confidence: 99%

“…Besides, they all adopted the ideal linear EH model, which mismatches the practical system and may lead to false optimization results of a system configuration. To avoid the performance loss, this paper considers the non-linear EH model obtained by real data measurement [5][6][7].…”

Section: Related Workmentioning

confidence: 99%

“…In most existing works, the RF-to-DC conversion efficiency is regarded as a constant taking value in (0, 1], referring to the linear EH model. However, according to very recent works, [5][6][7], the RF-to-DC conversion efficiency turns out to depend on the level of the input power, which means RF-to-DC conversion efficiency varies based on the input power and cannot be regarded as a constant anymore, referring to the non-linear EH model. Therefore, to avoid the system performance loss, the transmit design for SWIPT should be redesigned based on the non-linear EH model.…”

Section: Introductionmentioning

confidence: 99%

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Optimal coordinated beamforming with artificial noise for secure SWIPT in multi-cell networks

Xiong

Liu

et al. 2018

J Wireless Com Network

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This paper investigates the multi-cell coordinated beamforming (MCBF) design for secure simultaneous wireless information and power transfer (SWIPT) in both centralized and distributed manners. In each cell, one transmitter serves multiple information receivers (IRs) and energy receivers (ERs) with the non-linear energy harvesting (EH) model. Meanwhile, several eavesdroppers (Eves) intend to intercept the confidential information transmitted for IRs. To achieve a secure transmission, the artificial noise (AN) is embedded in the transmit signals of each transmitter. The proposed design is formulated into a power-minimization problem to guarantee the IRs' information and ERs' energy requirements while avoiding the information being intercepted by Eves. Since the problem is non-convex and not easy to solve, a solution method based on semi-definition relaxation (SDR) is proposed and the global optimum is proved to be guaranteed with full channel state information (CSI). We further present a distributed AN-aided MCBF for the system by using alternating direction method of multipliers (ADMM), with which each transmitter is able to calculate its own beamforming vectors and AN covariance matrix based on its local CSI. Simulation results show that our proposed distributed design converges to the global optimum obtained by the centralized one. It is also shown that by employing AN, the total required power of the system is reduced and the effect of AN on the system performance decreases with increment of transmit antennas. Compared with traditional linear EH model, optimizing the system under the non-linear EH one avoids false output power at the ERs and saves power at the transmitter.

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5G and Beyond Wireless Communication Networks

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Power allocation and scheduling for SWIPT systems with non-linear energy harvesting model

Cited by 65 publications

References 16 publications

Robust Beamforming for AN Aided MISO SWIPT System with Unknown Eavesdroppers and Non-Linear EH Model

Robust Beamforming for AN Aided MISO SWIPT System with Unknown Eavesdroppers and Non-Linear EH Model

Optimal coordinated beamforming with artificial noise for secure SWIPT in multi-cell networks

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