Terahertz Spatial Wireless Channel Modeling with Radio Radiance Field
This work addresses the problem of inefficient channel modeling for THz bands in 6G networks, offering a scalable and low-cost solution, though it appears incremental as it adapts an existing visual-based method to a new frequency regime.
The paper tackles the challenge of modeling terahertz (THz) communication channels, which suffer from severe propagation issues, by applying a radio radiance field (RRF) framework to reconstruct spatial channel state information with sparse measurements, showing that it captures key propagation paths effectively.
Terahertz (THz) communication is a key enabler for 6G systems, offering ultra-wide bandwidth and unprecedented data rates. However, THz signal propagation differs significantly from lower-frequency bands due to severe free space path loss, minimal diffraction and specular reflection, and prominent scattering, making conventional channel modeling and pilot-based estimation approaches inefficient. In this work, we investigate the feasibility of applying radio radiance field (RRF) framework to the THz band. This method reconstructs a continuous RRF using visual-based geometry and sparse THz RF measurements, enabling efficient spatial channel state information (Spatial-CSI) modeling without dense sampling. We first build a fine simulated THz scenario, then we reconstruct the RRF and evaluate the performance in terms of both reconstruction quality and effectiveness in THz communication, showing that the reconstructed RRF captures key propagation paths with sparse training samples. Our findings demonstrate that RRF modeling remains effective in the THz regime and provides a promising direction for scalable, low-cost spatial channel reconstruction in future 6G networks.