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Model Development For Wireless Propagation In Forested Environments

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Technical Report

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Naval Postgraduate School Monterey United States

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Wireless propagation modeling is a necessary task in the design of countless applications. Wireless signals attenuate at different rates according to the propagation environment. Given that vegetation is an unavoidable feature for most outdoor wireless channels, propagation models in forested environments are in high demand. The characterization of radio waves propagating through foliage is particularly complex due to the random characteristics of the channel.This research is focused on the development of three radiowave propagation models in forested environments. Field tests were performed at 2.4 GHz for the case where both the transmitting and receiving antennas are immersed in foliage. The propagation loss added by the forest component was estimated from the sets of measurement data, and an empirical model was created to forecast it. Also, electromagnetic properties of the medium were estimated and used in the investigation of a two-layered homogeneous model ground and foliage. A dielectric slab representing the forest was modeled using an electromagnetic field simulation application. Results from the empirical and analytical model show good agreement with the measured data. These findings bear direct relevance on radiowave propagation through foliage and provide useful information for accurate design of the link budget for similar scenarios.

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