Joint Optimization of STAR-RIS Assisted SWIPT Communication Systems

TL;DR

This paper introduces a STAR-RIS assisted SWIPT system that overcomes geographical limitations, optimizing phase, amplitude, and power splitting to enhance data rate and energy efficiency, outperforming traditional schemes.

Contribution

It proposes a novel STAR-RIS scheme with an alternating optimization method for joint phase, amplitude, and power splitting optimization in SWIPT systems.

Findings

Sum rate surpasses traditional RIS schemes

Optimized phase and power splitting improve efficiency

Enhanced QoS for users on both sides

Abstract

Simultaneous wireless information and power transfer (SWIPT) is an effective energy-saving technology, but its efficiency is hindered by environmental factors. The introduction of reconfigurable intelligent surfaces (RIS) has alleviated this issue, although it still faces significant constraints due to geographical limitations. This paper proposes a scheme that employs a simultaneously transmitting and reflecting (STAR)-RIS to assist SWIPT. It can overcome this limitation, achieve higher degrees of freedom (DoF), and provide better quality of service (QoS) for users on both sides of the ground. Meanwhile, we have considered a hybrid device based on a power splitting, which is capable of both energy harvesting and information decoding. We have proposed an efficient alternating optimization (AO) method to optimize the phase and amplitude vectors for reflection and transmission, beamforming and the optimal power splitting ratio, achieving an optimal balance between data rate and energy efficiency. Finally, simulation results demonstrate that the sum rate of the proposed model is superior to traditional RIS and other benchmark schemes.