Wireless power transfer (WPT) is expected to be a technology reshaping thelandscape of low-power applications such as the Internet of Things,machine-to-machine communications and radio frequency identification networks.Although there has been some progress towards multi-antenna multi-sine WPTdesign, the large-scale design of WPT, reminiscent of massive multiple-inputmultiple-output (MIMO) in communications, remains an open problem. Consideringthe nonlinear rectifier model, a multiuser waveform optimization algorithm isderived based on successive convex approximation (SCA). A lower-complexityalgorithm is derived based on asymptotic analysis and sequential approximation(SA). It is shown that the difference between the average output voltageachieved by the two algorithms can be negligible provided the number ofantennas is large enough. The performance gain of the nonlinear model baseddesign over the linear model based design can be large, in the presence of alarge number of tones.
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