In this paper, we propose a novel graph modeling method for analyzing the impact of foliage on propagation channels by utilizing spherically distributed scatters to characterize trees influence. Traditional graph modelling always uses rectangular or squared surfaces to simulate the real world objects, hence it fails to reflect foliage scattering structures accurately. By introducing the sphere, the original shape of environmental elements can be better modeled, resulting in a better explanation of the foliage influence on millimeter-waves (mm-waves) propagation. By comparing simulation results with measurements, we appreciated slight mismatches. With the aim of minimizing the mismatches found in our first approach, the proposed graph model is improved by using multilayer nested spheres, and the results obtained are more consistent with the measurement ones. The evaluation of the proposed method is conducted by comparing the simulated foliage loss characteristics and the real-environment measured data in directional domain.
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