FEEDER LINK CONFIGURATIONS TO SUPPORT LAYERED MODULATION FOR DIGITAL SIGNALS
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Accused Products
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.
5 Citations
66 Claims
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1-30. -30. (canceled)
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61. A system for transmitting signals to a receiver, comprising:
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a demodulator for receiving and demodulating a feeder link signal; a module for generating an upper layer signal of a layered modulation downlink signal and a lower layer signal of the layered modulation downlink signal from the received feeder link signal; a first modulator, for modulating the upper layer signal to produce a modulated upper layer signal of the layered modulation downlink signal for transmission to the receiver; and a second modulator, for modulating the lower layer signal to produce a modulated lower layer signal of the layered modulation downlink signal for transmission to the receiver. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 49, 50, 51, 52, 53, 54, 63, 65)
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62. A method of transmitting signals to a receiver, comprising:
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receiving and demodulating a feeder link signal; generating an upper layer signal of a layered modulation downlink signal and a lower layer signal of the layered modulation downlink signal from the received feeder link signal; modulating the upper layer signal to produce a modulated upper layer signal of the layered modulation downlink signal; and modulating the lower layer signal to produce a modulated lower layer signal of the layered modulation downlink signal. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 55, 56, 57, 58, 59, 60, 64, 66)
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Specification