2024/05/09 by Abdul Basit Khattak, Onel L. Alcaraz López, Khattak, Abdul Basit +7
Engineering · #Energy Harvesting in Wireless Networks #FOS: Electrical engineering #RFID technology advancements #Signal Processing (eess.SP) #Wireless Power Transfer Systems #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2405.05659
openalex publication_date 2024/05/09 · openalex created_date 2024/05/11 · openalex updated_date 2026/07/28
Radio frequency (RF) wireless power transfer (WPT) is a key technology for future low-power wireless systems. However, the inherently low end-to-end power transfer efficiency (PTE) is challenging for practical applications. The main factors contributing to it are the channel losses, transceivers' power consumption, and losses related, e.g., to the digital-to-analog converter (DAC), high-power amplifier, and rectenna. Optimizing PTE requires careful consideration of these factors, motivating the current work. Herein, we consider an analog multi-antenna power transmitter that aims to charge a single energy harvester. We first provide a mathematical framework to calculate the harvested power from multi-tone signal transmissions and the system power consumption. Then, we formulate the joint waveform and analog beamforming design problem to minimize power consumption and meet the charging requirements. Finally, we propose an optimization approach relying on swarm intelligence to solve the specified problem. Simulation results quantify the power consumption reduction as the DAC, phase shifters resolution, and antenna length are increased, while it is seen that increasing system frequency results in higher power consumption.