Energy-Efficiency-Oriented Charge Scheduling and Beamforming for a Two-Tier Wireless Powered Network
| Autor: | Runfa Zhou, Roger Shu Kwan Cheng, Linlong Wu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Beamforming
Network architecture Computer Networks and Communications Computer science business.industry Energy transfer 020206 networking & telecommunications 020302 automobile design & engineering 02 engineering and technology Computer Science Applications Scheduling (computing) 0203 mechanical engineering Hardware and Architecture Signal Processing 0202 electrical engineering electronic engineering information engineering Wireless business Information Systems Efficient energy use Computer network |
| Zdroj: | IEEE Internet of Things Journal. 7:2212-2222 |
| ISSN: | 2372-2541 |
| DOI: | 10.1109/jiot.2019.2959090 |
| Popis: | Long-range radio-frequency wireless charging has received more and more attention in recent years. Unlike the literature that focuses on the mobile charging scenario, which is formulated as a path-planning problem, we consider a static network that consists of a power beacon (PB) and multiple wireless powered user nodes. Each user node is equipped with a rechargeable battery and harvests energy only from the PB. We assume that all user nodes are either in charge or work mode. Under this assumption, we first propose a charge scheduling scheme that achieves the system’s maximal energy efficiency. We then further investigate the system’s improvement with a multiantenna PB using the energy beamforming technique. Next, we extend our scheduling scheme to a two-tier network architecture, where a first-tier PB first transfers energy to the second-tier sub-PBs, and then those sub-PBs deliver energy to the user nodes which belong to their clusters. It is shown that energy beamforming with multiple antennas brings a significant improvement to the system’s performance. Moreover, the two-tier architecture is shown to be superior to the one-tier architecture in terms of the energy transfer efficiency and the system’s realization complexity. Finally, the simulation results demonstrate our theoretical findings. |
| Databáze: | OpenAIRE |
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