Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1993-12-22
1995-09-12
Urban, Edward F.
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
455 521, 364550, H04B 1700
Patent
active
054506158
ABSTRACT:
Techniques are disclosed for predicting RF propagation within a structure such as a building. A reference transmitter location and a plurality of reference receiver locations are selected. For each reference receiver location, RF propagation pathways are determined with respect to the reference transmitter location. The RF propagation pathways include a direct path joining the reference transmitter location to a given reference receiver location across a straight-line path, as well as one or more reflection paths joining the reference transmitter location to a given reference receiver location via reflections from one or more reflective surfaces. One or more propagation pathways may pass through an RF obstacle, such as, for example, a lossy dielectric material. Each reflective surface and RF obstacle is associated with a reflection coefficient and a transmission coefficient. These coefficients are computed for each object and surface from a multilayer dielectric model, maintaining angle and polarization dependencies. For each propagation pathway, a propagation component consisting of the propagation loss relative to free-space propagation is calculated as the product of the magnitude squared of the reflection and transmission coefficients. The local mean of received RF power at each of the reference receiver locations is calculated as the scalar sum of the powers of all the propagation pathway components reaching the specified location.
REFERENCES:
patent: 4941207 (1990-07-01), Maeda et al.
patent: 5301127 (1994-04-01), Hitney
patent: 5327359 (1994-07-01), Hitney
George, "A Study of UHF Wideband Propagation Char.", Institute of Radio Engineers, vol. 27, No. 1, Jan. 1939.
Peterson, "UHF Propagation Formulas", RCA Review, Oct. 1939.
Fortune Steven J.
Gay David M.
Kernighan Brian W.
Landron Orlando
Valenzuela Reinaldo A.
AT&T Corp.
Bartholomew Steven R.
Urban Edward F.
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