Multi-sine Wireless Power Transfer with a Realistic Channel and Rectifier Model

© 2017 IEEE. This paper analyzes the multi-sine wireless power transfer (WPT) system efficiency under realistic channel conditions. A theoretical system model is established including the wireless channel and the rectifier to derive the output DC power based on the transmitted multi-sine signal. Multi-sine based WPT benefits from the transmission signal's high peak-to-average-power-ratio (PAPR). Nevertheless, both simulation and measurement results show that the PAPR of the received signal is decreased when the channel becomes frequency-selective. In a static single-path channel, the rectifier's RF-to-DC power conversion efficiency (PCE) increases first and then saturates with increasing signal bandwidth (BW). This is because the signal PAPR only depends on the number of tones in a frequency-flat channel. The initial improvement is cause by the fact that a small enough envelope period is needed to enable efficient energy harvesting. However, in a static multi-path channel, the rectifier PCE increases first and then decreases with increasing BW of the signal, since the channel becomes more and more frequency-selective with the increasing signal BW. For a 10 MHz two-tone signal, the rectifier PCE difference between a frequency selective or frequency flat channel can be up to 10% for our simulation assumptions.

ISBN:9781509045853

Jaar van publicatie:2017

BOF-keylabel:ja

IOF-keylabel:ja

Authors from:Higher Education