Distributed Wireless Power Transfer with Energy Feedback
Seunghyun Lee, Rui Zhang

TL;DR
This paper develops practical distributed energy beamforming protocols for wireless energy transfer, enabling efficient power delivery with minimal feedback and fast convergence even with many transmitters.
Contribution
It proposes two low-complexity training protocols for distributed energy beamforming that require only energy feedback, improving efficiency and convergence speed in practical systems.
Findings
Protocols converge rapidly in simulations with many ETs.
Sequential protocol achieves optimal design with increased training.
Performance surpasses benchmark schemes.
Abstract
Energy beamforming (EB) is a key technique for achieving efficient radio-frequency (RF) transmission enabled wireless energy transfer (WET). By optimally designing the waveforms from multiple energy transmitters (ETs) over the wireless channels, they can be constructively combined at the energy receiver (ER) to achieve an EB gain that scales with the number of ETs. However, the optimal design of EB waveforms requires accurate channel state information (CSI) at the ETs, which is challenging to obtain practically, especially in a distributed system with ETs at separate locations. In this paper, we study practical and efficient channel training methods to achieve optimal EB in a distributed WET system. We propose two protocols with and without centralized coordination, respectively, where distributed ETs either sequentially or in parallel adapt their transmit phases based on a…
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