Effects of Different Modulation Techniques on Charging Time in RF Energy-Harvesting System

Cansiz, Mustafa; Altınel, Doğay; Kurt, Güneş Karabulut

doi:10.1109/tim.2020.2978360

Cited by 13 publications

(2 citation statements)

References 33 publications

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“…However, the CSI feedback is attained over a wired medium. The literature has several other RF WPT test-beds for tasks such as charging a single supercapacitor with multiple ambient sources [43], determining the digital modulation with the lowest charging time [44], devising charging protocols to regulate multiple power sources and multiple energy harvesters [45], determining the optimal orientation between transmit and receive antennas [46], studying antenna directivity as a function of source-sensor distance [47]. Furthermore, blind adaptive beamforming techniques to direct the RF energy toward the harvester were studied and implemented in a multiple-input single-output WPT test-bed in [48].…”

Section: B Literature Reviewmentioning

confidence: 99%

Practical Waveform-to-Energy Harvesting Model and Transmit Waveform Optimization for RF Wireless Power Transfer Systems

Ayir

Riihonen

Heino

2023

IEEE Trans. Microwave Theory Techn.

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The received radio-frequency (RF) power in farfield RF wireless power transfer (WPT)-with or without simultaneous information transfer-is minuscule due to large propagation loss in wireless media. In such scenarios, adapting to the receiver characteristics by transmit waveform optimization is essential for maximizing the harvested direct current (dc) and, thus, the end-to-end efficiency of an RF WPT system. The receiver efficiency in RF WPT is governed by the RF-to-dc efficiency of the rectifier as well as the impedance mismatch at the antenna and load. In this article, we study the receiver efficiency for any fixed load and, subsequently, present a novel rectifier model that relates the average harvested dc power to the distribution, that is, the histogram, of the instantaneous power levels of the RF signal's envelope over time. The proposed waveform-to-energy harvesting (EH) model enables us to anticipate the average harvested dc power for any waveform, including communication signals as well, given the knowledge of the powerlevel distribution. Consequently, we conduct rigorous waveform optimization to maximize the average harvested dc power and determine the digital baseband signal at the transmitter that does so, namely prove that a pulsed tone at appropriate frequency is optimal for RF WPT. We present a multiband test-bed for determining the receiver efficiency for any digital baseband waveform. The efficacy of the proposed model is corroborated through experiments as well as simulations, which confirm that it is operational as well as accurate in practice and that single-sine pulses yield higher efficiency than basic multisine waveforms, while a pulsed phase shift keying (PSK) is preferable for simultaneous wireless information and power transfer (SWIPT).

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Section: B Literature Reviewmentioning

confidence: 99%

Practical Waveform-to-Energy Harvesting Model and Transmit Waveform Optimization for RF Wireless Power Transfer Systems

Ayir

Riihonen

Heino

2023

IEEE Trans. Microwave Theory Techn.

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“…The survey paper [257] provides a detailed description of the components of EH circuits. The energy efficiency of harvesting modules has been also listed recently in [258]. Although closely coupled, this survey aims to highlight the experimental activities of EH with information transfer.…”

Section: Experimental Studies On Swiptmentioning

confidence: 99%

A Survey on Multiuser SWIPT Communications for 5G+

Özyurt¹,

Coşkun

Büyükçorak

et al. 2022

IEEE Access

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Increasing number of devices connected to the networks, applications and demands of new generation wireless communications cause very high energy consumption resulting in large amount of carbon emission. Thus, energy harvesting solutions together with accomplishing information transmission are required for energy efficient communications of new wireless communications generations such as 5G and 6G (i.e., 5G+). As such, due to the promise of energy efficient green communications, simultaneous wireless information and power transfer (SWIPT) techniques are expected to be indispensable component of 5G+. In this survey, the literature of multiuser SWIPT communications is reviewed for 5G+. Different multiuser SWIPT scenarios including multi-antenna communications, cooperative communications, network coding, communications security, and unmanned aerial vehicle (UAV)-enabled communication systems based on multiuser diversity and multiple access methods are thoroughly reviewed. The experimental studies are also discussed.

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Design and implementation of a hybrid piezoelectric, radio frequency, solar, and thermal energy‐harvesting system for portable medical devices

Noohi,

Mirvakili

2024

Circuit Theory & Apps

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Today, energy harvesting has developed into a technique from which various aspects are still hidden. By extracting energies from the environment and even the human body, and converting them into electrical energy, we can supply power to low‐consumption electronic devices. Energy harvesting works by inhibiting small amounts of ambient energies; otherwise, it is wasted in other forms such as heat, vibration, and light. In this paper, we aim to eliminate or minimize the dependence of portable electronic devices to the batteries, which have limited life times, service costs, handling, and environmental problems. This is accomplished via incorporating the hybrid energy‐harvesting techniques and designed to power (bio)medical devices in order to measure vital signs. In this circuit, by simultaneously harvesting RF, light, thermal, and solar (natural and artificial) energies, we were able to increase the reliability of continuous supply of electrical energy in energy‐harvesting systems by generating and storing maximum power from the environment. Supercapacitors are used as the energy storage elements so that there is no energy waste, and each system is constantly storing the electrical energy with the aid of a diode block. In addition, with the help of supercapacitors, this device is able to transmit a maximum of 420 mW to the load and the total efficiency is equal to 74%.

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Effects of Different Modulation Techniques on Charging Time in RF Energy-Harvesting System

Cited by 13 publications

References 33 publications

Practical Waveform-to-Energy Harvesting Model and Transmit Waveform Optimization for RF Wireless Power Transfer Systems

Practical Waveform-to-Energy Harvesting Model and Transmit Waveform Optimization for RF Wireless Power Transfer Systems

A Survey on Multiuser SWIPT Communications for 5G+

Design and implementation of a hybrid piezoelectric, radio frequency, solar, and thermal energy‐harvesting system for portable medical devices

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