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Propagation Modeling in Urban Environments Dr. Saul A. Torrico Comsearch Senior Technical Consultant. Overview of Presentation. Objective Basic Principles of Diffraction Building Database Propagation Over Buildings Results Conclusions. Objective. Point-to-Point systems.
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Propagation Modeling in Urban EnvironmentsDr. Saul A. TorricoComsearchSenior Technical Consultant
Overview of Presentation • Objective • Basic Principles of Diffraction • Building Database • Propagation Over Buildings • Results • Conclusions
Objective • Point-to-Point systems. • Assess the path loss in an Urban environment from the Interference point of view. • Propagation over buildings. • Simplified representation of buildings. • Which diffraction techniques are used in the calculations?
Basic Principles of Diffraction • Diffracting Regions. • Diffraction Techniques • Physical Optics • Uniform Theory of Diffraction. • Wedge Diffraction. • NSMA Recommendation.
Building Database • Point-to-Point building profile. • Influence of roof shapes. • Replacing buildings by absorbing screens. • Average description of building heights and street widths.
Average Building Heights hHub hB hR d
Top View - Buildings • 1st-Fresnel vs. Buildings RCVR XMTR
Propagation Over Buildings • Multiple screen diffraction – Physical Optics. • First and Last Obstacle – Uniform Theory of Diffraction (90o Dielectric Wedge)
1st. Example 1st Fresnel Zone HXMTR HRCVR
2nd. Example 1st Fresnel Zone HXMTR HRCVR
Conclusion • Frequency congestion is increasing rapidly in urban markets. • Clearing cases based on building blockage may allow increased density of frequency assignments. • Path loss calculations in Urban environments.