Weighted Sum Rate Maximization for ITS-Aided Arrays in Multi-User MIMO

TL;DR

This paper investigates how integrating an Intelligent Transmissive Surface (ITS) into antenna arrays can significantly enhance beamforming performance and weighted sum rate in multi-user MIMO systems.

Contribution

It introduces a novel analysis of WSR optimization in ITS-aided arrays under different power constraints and explores key design parameters.

Findings

Passive refractive elements improve WSR significantly.

Choice of power constraint affects array design parameters.

Analysis of surface loss and illumination strategies impacts system performance.

Abstract

This work explores the potential of integrating an Intelligent Transmissive Surface (ITS) into an antenna array to improve beamforming performance. We show that integrating a moderate number of passive refractive elements into a small antenna array can significantly improve the Weighted Sum Rate (WSR). We investigate the optimization of the WSR under two distinct operational constraints: a Radiated Power (RP) constraint and a Transmitted Power (TP) constraint. Our analysis reveals that the choice between these constraints significantly impacts the design parameters of the ITS-aided array. By contrasting these approaches, we explore critical design and material parameters, including the array geometry, surface loss, and illumination strategies.