MicroCol 1999 - Deterministic Urban Wave Propagation Models

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Presented on MicroCol conference in 1999

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Deterministic Urban Wave Propagation Models: 

Deterministic Urban Wave Propagation Models L. Nagy, Z. Sándor, I. Laki, B. Pelhős TUB, Department of Microwave Telecommunication

Contents: 

Contents Wave propagation models Empirical, semi-empirical models Deterministic models - Ray Tracing Description of the model presented Vertical and transversal propagation planes Physical phenomena (diffraction,reflection) Databases Investigation of the model Test area in Budapest Test area in M unich Future plans

Propagation planes of the model: 

Propagation planes of the model Vertical profile perpendicular plane between the mobile and base station primary diffraction on rooftops multiple diffraction diffraction on the opposite wall Transversal profile perpendicular to the vertical one diffraction on the edges of buildings reflection on the perpendicular walls

Physical phenomena: 

Physical phenomena Direct rays Speculative reflection Diffraction Geometrical Theory of Diffraction [ Keller, 1962 ] Uniform Geometrical Theory of Diffraction [ Kouyoumijan, 1974 ]

Databases: 

Databases General Vectorial Raster Studied databases Vectorial data of buildings Raster data of terrain Flat roof tops Walls made of brick No vegetation Test areas Budapest, at Nyugati railway station The City of Munich

Test area in Budapest - Measuring routes : 

Test area in Budapest - Measuring routes A: 45 points B: 44 points C: 45 points D: 32 points E: 60 points F: 60 points Database frequency = 952 MHz number of walls = 2544 number of buildings = 510 avg. building height =124.3 m base station height = 146 m

Test area in Budapest - Results: 

Test area in Budapest - Results Route C

Test area in Budapest - Results: 

Test area in Budapest - Results Route F

Test area in Munich - Measuring routes : 

Test area in Munich - Measuring routes 0: 1030 points 1: 970 points 2: 355 points Database frequency = 947 MHz number of walls = 17445 number of buildings = 2088 avg. building height = 532.5 m base station height = 526 m

Test area in Munich - Results: 

Test area in Munich - Results - 70 pixels -

Test area in Munich - Results: 

Test area in Munich - Results - 110 pixels -

Future plans: 

Future plans Decrease of simulation time with sorting the data in databases Reduce the mean error with improving of the databases correcting the precision of vectorial data building parameters roughness of wall surface Wide band simulation delay spread calculation