Retrodirective Large Antenna Energy Beamforming in Backscatter Multi-User Networks

TL;DR

This paper introduces a low-complexity energy beamforming method for multi-user backscatter networks that leverages large antenna retrodirectivity and signal backscattering, optimizing energy transfer without active receiver operations.

Contribution

It proposes a novel retrodirective energy beamforming technique combining large antenna arrays with backscattering, reducing complexity and eliminating the need for active receiver processing.

Findings

The proposed policies effectively enhance energy harvesting in multi-user backscatter networks.

Analysis shows robustness of the method under spatial randomness.

The technique simplifies energy beamforming in large-scale systems.

Abstract

In this letter, we study a new technique for energy beamforming (EB) in multi-user networks, which combines large antenna retrodirectivity at the transmitter side with signal backscattering at the energy receivers. The proposed technique has low complexity and achieves EB without any active operation at the receivers or complicated signal processing techniques at the transmitter. Since the average harvested energy depends on the backscattering coefficients, we investigate different reflection policies for various design objectives. The proposed policies are analyzed from a system level standpoint by taking into account spatial randomness.