A ray launching method for radio-mobile propagation in urban area

A computer code based on digitized terrain data was developed to estimate path losses and selectivity characteristics of the urban radio channel between a mobile located in a street and a base station on the roof of a high building. The principle of the program consists in a ray launching in projection on the horizontal plane supplemented by third-dimension considerations. Some simulated results are presented and compared with actual measured data. The computed mean impulse response is always in good agreement for the first delay paths. A significant discrepancy can arise for long delay paths, but realistic features are always observed.<
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