A Diffraction Based Theoretical Model for Prediction of UHF Path Loss in cities,
GTE LABS INC BAYSIDE N Y
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Cellular mobile radio and other urban communication systems working in the UHF band 30MHz - 3GHz are based on propagation from an elevated fixed antenna to a mobile at street level. The requirement for cellular systems for coverage in one area, and isolation from other areas, makes prediction of path loss in cities an important aspect of system design. To date, the only bases for predicting path loss are the measurements made in various cities. This paper presents a theory for predicting path loss in urban areas outside of the high-rise urban core. In such area, the buildings are of nearly uniform height and form nearly parallel rows. Each row has the appearance of a cylinder lying on the ground, so that propagation is a process of diffraction past many cylinders. Using this approach, we develop a model for predicting average path loss that is in good agreement with measurements.
- Radiofrequency Wave Propagation
- Sociology and Law
- Radio Communications