Modelling the likelihood of line-of-sight for air-to-ground radio propagation in urban environments

Q Feng, EK Tameh, AR Nix, JP McGeehan

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

60 Citations (Scopus)
558 Downloads (Pure)


The likelihood of line-of-sight (LoS) is an essential component in any radio channel model. It is particularly useful for radio network planning and urban coverage prediction. Empirical LoS models are hard to derive due to a strong dependency on local topology and the need for large measurement datasets. Since buildings are the major obstructions in a dense urban environment, we propose a new theoretical model to determine the LoS probability for air-to-ground channels based on local building geometry and knife-edge diffraction theory. The model takes into account key statistical parameters such as building height, building size, building coverage, street width and street angle distribution. The theoretical model is shown to agree well with ray tracing simulation results. The statistical parameters, such as mean building height, percentage of area covered by buildings (building coverage) and building density, can all be easily obtained for a specific location. We also derive equations for the likelihood of LoS for a direct slant path. These equations can be used in the analysis of air-to-ground channels.
Translated title of the contributionModelling the lLikelihood of Line-of-Sight for air-to-ground radio propagation in urban environments
Original languageEnglish
Title of host publicationIEEE Global Telecommunications Conference, 2006 (GLOBECOM '06)
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages5
ISBN (Print)1-4244-0356-1
Publication statusPublished - Nov 2006
EventGlobal Telecommunications Conference, 2006 (GLOBECOM 2006) - San Francisco, United States
Duration: 1 Nov 2006 → …

Publication series

ISSN (Print)1930-529X


ConferenceGlobal Telecommunications Conference, 2006 (GLOBECOM 2006)
Country/TerritoryUnited States
CitySan Francisco
Period1/11/06 → …

Bibliographical note

Publisher: Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Name and Venue of Conference: IEEE Global Telecommunications Conference, 2006 (GLOBECOM '06), San Francisco
Name and Venue of Event: IEEE Global Telecommunications Conference, 2006 (GLOBECOM '06)
Rose publication type: Conference contribution

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  • radio channel model
  • likelihood of line-of-sight
  • Fresnel zone
  • knife-edge diffraction
  • air-to-ground
  • urban


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