Electromagnetic-Compliant Channel Modeling and Performance Evaluation for Holographic MIMO

TL;DR

This paper introduces an electromagnetic-compliant channel model for holographic MIMO systems, enabling realistic performance evaluation by accounting for mutual coupling and antenna imperfections, and discusses future research directions.

Contribution

It proposes a novel EM-compliant channel model for holographic MIMO that captures propagation and non-ideal factors, advancing performance assessment methods.

Findings

The model accurately reflects mutual coupling effects.

Performance varies significantly between single-user and multi-user scenarios.

Provides insights into future research challenges.

Abstract

Recently, the concept of holographic multiple-input multiple-output (MIMO) is emerging as one of the promising technologies beyond massive MIMO. Many challenges need to be addressed to bring this novel idea into practice, including electromagnetic (EM)-compliant channel modeling and accurate performance evaluation. In this paper, an EM-compliant channel model is proposed for the holographic MIMO systems, which is able to model both the characteristics of the propagation channel and the non-ideal factors caused by mutual coupling at the transceivers, including the antenna pattern distortion and the decrease of antenna efficiency. Based on the proposed channel model, a more realistic performance evaluation is conducted to show the performance of the holographic MIMO system in both the single-user and the multi-user scenarios. Key challenges and future research directions are further provided based on the theoretical analyses and numerical results.