Holographic MIMO-assisted Multiuser Transmission with Electromagnetic Exposure Constraints

2026-07-12

AI Summary

This study addresses the issue of excessive electromagnetic exposure at user terminals in holographic MIMO multi-user uplink transmission. For the first time, a physically consistent specific absorption rate (SAR) model is integrated into the system to establish a channel and radiation coupling framework that adheres to realistic electromagnetic safety constraints. Building upon this foundation, an enhanced iterative water-filling algorithm is proposed to optimize power allocation under strict SAR limits, thereby maximizing system spectral efficiency. Simulation results demonstrate that the proposed approach significantly improves spectral efficiency while ensuring compliance with electromagnetic safety requirements, effectively achieving a synergistic balance between user safety and communication performance.

Abstract

Holographic multiple-input multiple-output (HMIMO) has emerged as a promising technology for future wireless systems by enabling continuous electromagnetic (EM) field control over large apertures. However, user-side EM exposure has become an increasingly important concern in large-scale array systems. This paper addresses this issue by developing a multiuser uplink HMIMO model, where a physically consistent specific absorption rate (SAR) model is established to quantify the EM exposure. On this basis, a spectral efficiency (SE) maximization problem is addressed by developing a modified iterative water-filling algorithm. Simulation results demonstrate that the proposed algorithm effectively improves the system SE while satisfying the SAR constraints.

Problem

• Holographic MIMO
• Electromagnetic exposure
• Specific Absorption Rate
• Multiuser Transmission
• Spectral Efficiency

Innovation

• Holographic MIMO
• Specific Absorption Rate (SAR)
• Electromagnetic Exposure
• Spectral Efficiency Maximization
• Iterative Water-filling Algorithm