Holographic MIMO-assisted Multiuser Transmission with Electromagnetic Exposure Constraints
arXiv:2607.11015 · doi:10.1109/TVT.2026.3711155
The paper proposes a multiuser uplink holographic MIMO system that incorporates a specific absorption rate (SAR) model to limit user electromagnetic exposure, and solves a spectral efficiency maximization problem using a modified iterative water‑filling algorithm.
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.
6 pages, 4 figures, to appear on IEEE Transactions on Vehicular Technology