Exploiting Polarization Domain of the IOS for Enhanced Full-Dimensional Transmission

TL;DR

This paper introduces a dual-polarized IOS design that exploits polarization to independently control refraction and reflection, significantly improving system performance over traditional power-domain IOS.

Contribution

It proposes a novel dual-polarized IOS-assisted communication framework that overcomes coupling limitations, enabling independent refraction and reflection modes for enhanced transmission.

Findings

Dual-polarized IOS outperforms power-domain IOS in simulations.

The proposed iterative algorithm effectively maximizes sum rate.

Polarization domain exploitation improves coverage and capacity.

Abstract

Intelligent omni-surface (IOS), capable of providing service coverage to mobile users (MUs) in a reflective and refractive manner, has recently attracted widespread attention. However, the performance of power-domain IOS-assisted systems is limited by the intimate coupling between the refraction and reflection behavior of IOS elements. In this paper, we introduce the concept of dual-polarized IOS-assisted communication to overcome this challenge. By employing the polarization domain in the design of IOS, full independent refraction and reflection modes can be delivered. We consider a downlink dual-polarized IOS-aided system while also accounting for the leakage between different polarizations. To maximize the sum rate, we formulated a joint base station (BS) digital and IOS analog beamforming problem and proposed an iterative algorithm to solve the nonconvex program. Simulation results validate that dual-polarized IOS significantly enhances the performance than that of the power-domain one.