Multiplex communications – Communication over free space – Repeater
Reexamination Certificate
2003-10-20
2008-09-09
D'Agosta, Stephen M (Department: 2617)
Multiplex communications
Communication over free space
Repeater
C370S319000, C370S321000, C370S322000, C370S328000, C370S337000, C455S427000, C455S428000, C455S429000, C455S431000, C375S316000, C375S320000, C375S327000, C332S103000, C329S304000
Reexamination Certificate
active
07423987
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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Anderson Paul R.
Chen Ernest C.
Santoru Joseph
D'Agosta Stephen M
The DIRECTV Group Inc.
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