Wireless power transfer (WPT) is expected to be a technology reshaping the
landscape 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 WPT
design, the large-scale design of WPT, reminiscent of massive multiple-input
multiple-output (MIMO) in communications, remains an open problem. Considering
the nonlinear rectifier model, a multiuser waveform optimization algorithm is
derived based on successive convex approximation (SCA). A lower-complexity
algorithm is derived based on asymptotic analysis and sequential approximation
(SA). It is shown that the difference between the average output voltage
achieved by the two algorithms can be negligible provided the number of
antennas is large enough. The performance gain of the nonlinear model based
design over the linear model based design can be large, in the presence of a
large number of tones.Comment: To appear in the 17th IEEE International Workshop on Signal
Processing Advances in Wireless Communications (SPAWC 2016