B-WLL에서 지붕형 건물 및 나무에 의한 전파 음영 지역 해석

Propagation Study of the Shadow Region by Roof-top Building ana Tree in B-WLL

This paper presents the radio propagation effects in the shadow region due to the presence of obstacle, like building and tree, along the path at the B-WLL band. Using the Uniform Theory of Diffraction(UTD), the total field was obtained as the sum of contributions with diffraction ray from the each obstacle's edge, the direct ray, and the reflected rays from ground. The normalized signal level(in ㏈) is calculated with the parameters of the base station elevation and the distance between obstacle and receiver. This results are used to provide the suitable radio cell planning and coverage prediction in the area of shadow region.