Site-Specific Channel Modeling and Optimization of RIS-Assisted Multiuser MISO Systems
Abstract
This paper presents a physics-based channel modeling and optimization framework for reconfigurable intelligent surface (RIS)-assisted downlink multi-user multiple-input single-output (MU-MISO) communication systems in site-specific environments. A hybrid ray-tracing (RT) and full-wave electromagnetic analysis approach is developed to construct a deterministic channel model that explicitly captures multipath propagation, RIS scattering behavior, and mutual coupling effects through a non-diagonal load impedance representation. Based on this model, an alternating optimization scheme jointly updates the base-station (BS) beamformer and RIS load impedances to maximize the minimum achievable rate under a total transmit power constraint and practical capacitance limits. The objective of the proposed framework is to provide a reliable initial assessment of the system-level impact of RIS deployment in realistic propagation scenarios. To evaluate this capability, the RIS is operated in a column-paired 1-bit control mode that enables exhaustive evaluation of all realizable configurations in both simulation and measurement. Performance is compared at the distribution level through achievable-rate histograms across all configurations and further examined under small user-location variations. The observed agreement between simulation and measurement demonstrates that the proposed framework reliably captures practical performance trends and provides useful guidance for the design and deployment of RIS-assisted MU-MISO systems in site-specific environments.
Keywords
Cite
@article{arxiv.2603.21433,
title = {Site-Specific Channel Modeling and Optimization of RIS-Assisted Multiuser MISO Systems},
author = {Ziqi Liu and Wei Yu and Sean Victor Hum},
journal= {arXiv preprint arXiv:2603.21433},
year = {2026}
}
Comments
12 pages, 10 figures, 1 table, Submitted to IEEE Open Journal of Antennas and Propagation