Simultaneous Wireless Information and Power Transfer for Fluid Antenna Systems

TL;DR

This paper introduces a fluid antenna system that optimizes antenna positions and transmit strategies to improve simultaneous wireless information and power transfer efficiency, outperforming traditional fixed antennas.

Contribution

It proposes a novel fluid antenna-based SWIPT system with position optimization and transmit covariance design for enhanced energy harvesting.

Findings

Fluid antennas significantly improve energy harvesting efficiency.

Position optimization enhances SWIPT performance.

Simulation confirms superiority over fixed antennas.

Abstract

Fluid antenna is a promising wireless communication technology that enhances communication rate by changing the antenna positions. This article proposes a new communication system that combines multiple-input single-output (MISO) fluid antennas with traditional fixed-position antennas, utilizing antenna position optimization to improve energy harvesting efficiency. In this model, we consider simultaneous wireless information and power transfer (SWIPT) which transmits identical signals from the base station to both information receiver (IR) and energy receiver (ER). We strive to enhance the power delivered to the ER by fine-tuning the positions of transmit and receive fluid antennas, along with optimizing the transmit covariance matrix, subject to a given minimum signal-to-interference-plus-noise ratio (SINR) constraint at the IR. Simulation results indicate that fluid antenna systems significantly enhance the energy harvesting efficiency of the ER compared to traditional fixed-position antennas.