FDMA-Based Passive Multiple Users SWIPT Utilizing Resonant Beams

TL;DR

This paper introduces a passive multi-user resonant beam system for SWIPT that employs FDMA and frequency conversion, enabling efficient power transfer and communication with adaptive beam-forming without pilot signals.

Contribution

It presents a novel MU-RBS architecture with adaptive beam-forming and interference avoidance, enhancing SWIPT performance over traditional MIMO-based systems.

Findings

Achieves adaptive beam-forming without pilot signals

High directivity and optimized power transfer efficiency

Improved spectral efficiency with increased iterations

Abstract

The rapid development of IoT technology has led to a shortage of spectrum resources and energy, giving rise to simultaneous wireless information and power transfer (SWIPT) technology. However, traditional multiple input multiple output (MIMO)-based SWIPT faces challenges in target detection. We have designed a passive multi-user resonant beam system (MU-RBS) that can achieve efficient power transfer and communication through adaptive beam alignment. The frequency division multiple access (FDMA) is employed in the downlink (DL) channel, while frequency conversion is utilized in the uplink (UL) channel to avoid echo interference and co-channel interference, and the system architecture design and corresponding mathematical model are presented. The simulation results show that MU-RBS can achieve adaptive beam-forming without the target transmitting pilot signals, has high directivity, and as the number of iterations increases, the power transmission efficiency, signal-to-noise ratio and spectral efficiency of the UL and DL are continuously optimized until the system reaches the optimal state.