Feeder link configurations to support layered modulation for digital signals
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United States of America Patent
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Sep 9, 2008
Grant Date -
Mar 16, 2006
app pub date -
Oct 20, 2003
filing date -
Apr 27, 2001
priority date (Note) -
In Force
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Abstract
Systems and methods are disclosed for feeder link configurations to layered modulation. One feeder link system employs feeder link spot beam to antennas in distinct coverage areas to enable frequency reuse. Another system employs narrow beam width feeder link antenna to illuminate individual satellites also enabling frequency reuse. Yet another system uses layered modulation in the feeder link. Another feeder link system employs a higher order synchronous modulation for the satellite feeder link than is used in the layered modulation downlink signals.
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