Fluid Antenna-Assisted Simultaneous Wireless Information and Power Transfer Systems

TL;DR

This paper introduces a fluid antenna-assisted SWIPT system that dynamically reconfigures antenna positions to improve energy harvesting and communication, using joint optimization and iterative algorithms.

Contribution

It proposes a novel fluid antenna approach for SWIPT systems, enabling dynamic reconfiguration and joint optimization of beamforming and antenna positions.

Findings

Significant performance improvements over traditional fixed-position antenna systems.

Effective joint optimization method using alternating optimization and Taylor expansions.

Validation through simulations demonstrating enhanced energy and data transfer efficiency.

Abstract

This paper examines a fluid antenna (FA)-assisted simultaneous wireless information and power transfer (SWIPT) system. Unlike traditional SWIPT systems with fixed-position antennas (FPAs), our FA-assisted system enables dynamic reconfiguration of the radio propagation environment by adjusting the positions of FAs. This capability enhances both energy harvesting and communication performance. The system comprises a base station (BS) equipped with multiple FAs that transmit signals to an energy receiver (ER) and an information receiver (IR), both equipped with a single FA. Our objective is to maximize the communication rate between the BS and the IR while satisfying the harvested power requirement of the ER. This involves jointly optimizing the BS's transmit beamforming and the positions of all FAs. To address this complex convex optimization problem, we employ an alternating optimization (AO) approach, decomposing it into three sub-problems and solving them iteratively using first and second-order Taylor expansions. Simulation results validate the effectiveness of our proposed FA-assisted SWIPT system, demonstrating significant performance improvements over traditional FPA-based systems.