Simplifying Through-Forest Propagation Modelling

Abstract

Propagation analysis and modeling is critical for radio systems design, but remains a challenge for most throughvegetation situations, including forests. Transmission through such inhomogeneous mixed media is complicated by the many different propagation mechanisms and the complexity of the randomness. This means that accurate, purely physics-based analysis is unlikely to be practical (conveniently computed), and similarly, that practical, purely random modeling is unlikely to be accurate. Through-vegetation propagation models, including the standard radiative energy transfer (RET), are not very accurate in the sense that the uncertainty can be tens of dB, and this seems to be an accepted limitation for vegetation. A simpler propagation model, which maintains or improves accuracy, but keeps a reasonable association with the physics, would be insightful. This paper discusses such a model. It comprises two parallel transmission mechanisms: direct transmission through a succession of trees, which is modeled by a simple linear transmission line; and transmission across the forest top, which is modeled by simplified multiple-edge diffraction. The model is examined using recently-published experiments over a long path-length. It is demonstrated that this two-mechanism model can provide an accurate fit to the dual-slope profile of throughforest propagation over a long distance which is not possible with the RET model.

Data-Driven Diffraction Loss Estimation for Future Intelligent Transportation Systems in 6G Networks

“…From their proposed model, we can conclude the diffraction loss depends on the height of the obstacles and the distance between two communication ends. Several studies estimate diffraction loss for different scenarios using mathematical models [23][24][25]. For instance, the authors of [23] proposed mathematical models to determine the diffraction loss in a rain forest environment from the ground.…”

Radiação de Linhas de Corrente Magnética e Elétrica em uma Região Mista com Quatro Meios

“…Trabalhos com não homogeneidade em apenas uma dimensão, por exemplo, regiões com estratificação horizontal, são bem conhecidos na literatura [2]- [6]. Um exemplo de modelo de propagação em floresta com estratificação apenas na vertical é apresentado em [7].…”