Radiative wireless power transfer (WPT) is a promising technology to providecost-effective and real-time power supplies to wireless devices. Althoughradiative WPT shares many similar characteristics with the extensively studiedwireless information transfer or communication, they also differ significantlyin terms of design objectives, transmitter/receiver architectures and hardwareconstraints, etc. In this article, we first give an overview on the various WPTtechnologies, the historical development of the radiative WPT technology andthe main challenges in designing contemporary radiative WPT systems. Then, wefocus on discussing the new communication and signal processing techniques thatcan be applied to tackle these challenges. Topics discussed include energyharvester modeling, energy beamforming for WPT, channel acquisition, powerregion characterization in multi-user WPT, waveform design with linear andnon-linear energy receiver model, safety and health issues of WPT, massive MIMO(multiple-input multiple-output) and millimeter wave (mmWave) enabled WPT,wireless charging control, and wireless power and communication systemsco-design. We also point out directions that are promising for future research.
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