Retrodirective Multi-User Wireless Power Transfer with Massive MIMO
Seunghyun Lee, Yong Zeng, and Rui Zhang

TL;DR
This paper proposes a low-complexity retrodirective beamforming scheme for multi-user wireless power transfer with massive MIMO, addressing fairness issues through an iterative beacon power adjustment algorithm.
Contribution
It introduces a simple retrodirective WPT scheme with massive MIMO and develops a distributed power control algorithm to mitigate the doubly near-far problem.
Findings
The retrodirective scheme achieves massive MIMO beamforming gain.
The distributed algorithm converges quickly to a fair power distribution.
The proposed method improves energy harvesting fairness among users.
Abstract
This letter studies a radio-frequency (RF) multi-user wireless power transfer (WPT) system, where an energy transmitter (ET) with a large number of antennas delivers energy wirelessly to multiple distributed energy receivers (ERs). We investigate a low-complexity WPT scheme based on the retrodirective beamforming technique, where all ERs send a common beacon signal simultaneously to the ET in the uplink and the ET simply conjugates and amplifies its received sum-signal and transmits to all ERs in the downlink for WPT. We show that such a low-complexity scheme achieves the massive multiple-input multiple-output (MIMO) energy beamforming gain. However, a "doubly near-far" issue exists due to the round-trip (uplink beacon and downlink WPT) signal propagation loss where the harvested power of a far ER from the ET can be significantly lower than that of a near ER if the same uplink beacon…
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Taxonomy
TopicsEnergy Harvesting in Wireless Networks · Antenna Design and Analysis · Advanced MIMO Systems Optimization
