Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation
Reexamination Certificate
2000-01-11
2001-10-16
Blum, Theodore M. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna orientation
Reexamination Certificate
active
06304213
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention is related to determination of transmission quality from directional antennas.
2. Description of Related Art
In fixed wireless systems, range and capacity can be maximized by using directional terminal antennas, in contrast to the omni-directional antennas used in mobile wireless systems. The received power can be higher than that for an omni-directional antenna by as much as the azimuthal gain (G
0
, in dB) of the antenna, but only if the arriving rays lie in an angular range much narrower than the main-lobe. If they do not, some arriving rays will be weighted by the antenna side-lobes and the increase in received power will be less than G
0
. This decrement is referred to as the gain reduction factor &Dgr;, in dB. Determining this gain reduction factor in suburban environments can be complicated and results are only marginally accurate.
SUMMARY OF THE INVENTION
The exemplary embodiment of the invention provides a system and method for statistically modeling the operation of a directional terminal antenna in a wireless link. Although it is conventionally understood that, theoretically, received power may be enhanced by as much as the antenna gain when using a directional terminal antenna, the practical enhancement will be smaller due to local scattering. The system and method statistically model the gain reduction factor &Dgr; experienced using a directional antenna in a wireless link. The system and method statistically model the gain reduction factor, &Dgr;, for fixed suburban paths, based on angle-of-arrival measurements. The system and method also provide the capability to statistically model the transmission performance of a directional terminal antenna in a wireless link while analyzing influences of antenna height, antenna beamwidth, distance and season.
REFERENCES:
patent: 5739788 (1998-04-01), Dybdal et al.
Erceg Vinko
Greenstein Lawrence Joel
AT&T Corporation
Blum Theodore M.
Oliff & Berridge PLC.
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