2020/12/31 by Samith Abeywickrama, Rui Zhang, Abeywickrama, Samith +3
Engineering · #Energy Harvesting in Wireless Networks #Advanced MIMO Systems Optimization #Antenna Design and Analysis
paper · pdf · doi:10.48550/arxiv.2012.15615
In this paper, we study the optimal waveform design for wireless power\ntransfer (WPT) from a multi-antenna energy transmitter (ET) to multiple\nsingle-antenna energy receivers (ERs) simultaneously in multi-path\nfrequency-selective channels. First, we propose a refined nonlinear\ncurrent-voltage model of the diode in the ER rectifier, and accordingly derive\nnew expressions for the output direct current (DC) voltage and corresponding\nharvested power at the ER. Leveraging this new rectenna model, we first\nconsider the single-ER case and study the multisine-based power waveform design\nbased on the wireless channel to maximize the harvested power at the ER. We\npropose two efficient algorithms for finding high-quality suboptimal solutions\nto this non-convex optimization problem. Next, we extend our formulated\nwaveform design problem to the general multi-ER case for maximizing the\nweighted sum of the harvested powers by all ERs, and propose an efficient\ndifference-of-convex functions programming (DCP)-based algorithm for solving\nthis problem. Finally, we demonstrate the superior performance of our proposed\nwaveform designs based on the new rectenna model over existing schemes/models\nvia simulations.\n