Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Reexamination Certificate
1999-08-11
2004-06-01
Maung, Nay (Department: 2684)
Telecommunications
Carrier wave repeater or relay system
Portable or mobile repeater
C455S010000, C455S016000, C455S021000, C455S003020
Reexamination Certificate
active
06745005
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to satellite broadcast systems, and more particularly to a method and apparatus for reducing deep fading of signals transmitted from terrestrial repeater stations used in such systems.
BACKGROUND OF THE INVENTION
Terrestrial repeater stations are used as part of conventional satellite-based communications systems to amplify and re-transmit channel encoded signals as they travel from a satellite to their intended final destination, such as a mobile receiver. Typically, a plurality of repeater are employed to provide good signal coverage in a particular metropolitan area.
FIG. 1
shows a diagram of a conventional repeater station
10
in which a receive antenna
11
receives an RF signal from a satellite. The received signal is then filtered by a baseband filter
12
before being amplified first by a low-noise amplifier
13
and then by a high-power amplifier
14
. The amplified signal is then transmitted by a transmit antenna
15
to its intended final destination.
Conventional satellite-based communications systems which employ terrestrial repeater stations suffer from a significant drawback. Specifically, since each one of the repeater stations transmit identical signals, these signals often destructively add together forming an interference pattern that severely degrades the quality of the signal received at its intended final destination. The periods of time during which such interference prevents strong, clear signals from being received is commonly referred to as deep fading.
REFERENCES:
patent: 5864579 (1999-01-01), Briskman
patent: 6125109 (2000-09-01), Fuerter
Lou Hui-Ling
Weerackody Vijitha
Maung Nay
Sobutka Philip J.
Zimmerman Jean-Marc
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