Feeder link configurations to support layered modulation for digital signals
First Claim
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1. A system for uplinking signals, comprising:
- a first receiver for receiving a first feeder link signal using a first feeder link spot beam antenna for a first satellite transponder, the first satellite transponder transmitting an upper layer signal of a layered modulation signal to at least one receiver;
a second receiver for receiving a second feeder link signal using a second feeder link spot beam antenna for a second satellite transponder, the second satellite transponder transmitting a lower layer signal of the layered modulation signal to the at least one receiver;
wherein the first feeder link spot beam antenna transmits from a first coverage area and the second feeder link spot beam antenna transmits from a second coverage area distinct from the first coverage area and the second feeder link signal reuses a frequency spectrum of the first feeder link signal.
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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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Citations
68 Claims
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1. A system for uplinking signals, comprising:
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a first receiver for receiving a first feeder link signal using a first feeder link spot beam antenna for a first satellite transponder, the first satellite transponder transmitting an upper layer signal of a layered modulation signal to at least one receiver;
a second receiver for receiving a second feeder link signal using a second feeder link spot beam antenna for a second satellite transponder, the second satellite transponder transmitting a lower layer signal of the layered modulation signal to the at least one receiver;
wherein the first feeder link spot beam antenna transmits from a first coverage area and the second feeder link spot beam antenna transmits from a second coverage area distinct from the first coverage area and the second feeder link signal reuses a frequency spectrum of the first feeder link signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 61)
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10. A method of uplinking signals, comprising:
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receiving a first feeder link signal using a first feeder link spot beam antenna for a first satellite transponder, the first satellite transponder transmitting an upper layer signal of a layered modulation signal to at least one receiver;
receiving a second feeder link signal using a second feeder link spot beam antenna for a second satellite transponder, the second satellite transponder transmitting a lower layer signal of the layered modulation signal to the at least one receiver;
wherein the first feeder link spot beam antenna transmits from a first coverage area and the second feeder link spot beam antenna transmits from a second coverage area distinct from the first coverage area and the second feeder link signal reuses a frequency spectrum of the first feeder link signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 62)
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19. A system for uplinking signals, comprising:
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a first receiver for receiving a first feeder link signal for a first satellite transponder on a first satellite, the first satellite transponder transmitting an upper layer signal of a layered modulation signal to at least one receiver;
a second receiver for receiving a second feeder link signal for a second satellite transponder on a second satellite, the second satellite transponder transmitting a lower layer signal of the layered modulation signal to the at least one receiver;
wherein the second feeder link signal reuses a frequency band of the first feeder link signal and the first satellite and the second satellite have an orbital separation sufficient to allow reuse of the frequency band. - View Dependent Claims (20, 21, 22, 23, 24, 63)
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25. A method of uplinking signals, comprising:
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receiving a first feeder link signal for a first satellite transponder on a first satellite, the first satellite transponder transmitting an upper layer signal of a layered modulation signal to at least one receiver;
receiving a second feeder link signal for a second satellite transponder on a second satellite, the second satellite transponder transmitting a lower layer signal of the layered modulation signal to the at least one receiver;
wherein the second feeder link signal reuses a frequency band of the first feeder link signal and the first satellite and the second satellite have an orbital separation sufficient to allow reuse of the frequency band. - View Dependent Claims (26, 27, 28, 29, 30, 64)
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31. A system for uplinking signals, comprising:
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a layered modulation receiver/demodulator for receiving and demodulating an upper layer feeder link signal and a lower layer feeder link signal both from a layered modulation feeder link signal;
a first modulator for modulating the upper layer feeder link signal to produce an upper layer signal of a layered modulation downlink signal to at least one receiver; and
a second modulator for modulating the lower layer feeder link signal to produce a lower layer signal of the layered modulation downlink signal to the at least one receiver. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 65)
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40. A method of uplinking signals, comprising:
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receiving a layered modulation feeder link signal, the layered modulation feeder link signal comprising an upper layer feeder link signal and a lower layer feeder link signal;
demodulating the upper layer feeder link signal from the layered modulation feeder link signal;
demodulating the lower layer feeder link signal from the layered modulation feeder link signal;
modulating the upper layer feeder link signal for transmitting an upper layer downlink signal of a layered modulation downlink signal to at least one receiver; and
modulating the second feeder link signal for transmitting a lower layer downlink signal of the layered modulation downlink signal to the at least one receiver. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 66)
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49. A system for uplinking signals, comprising:
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a higher order receiver/demodulator for receiving and demodulating a feeder link signal into a first bit stream;
a demultiplexer for demultiplexing the first bit stream into a second bit stream and a third bit stream;
a first lower order modulator for modulating the second bit stream into an upper layer signal of a layered modulation signal for transmission to at least one receiver;
a second lower order modulator for modulating the third bit stream into a lower layer signal of the layered modulation signal for transmission to the at least one receiver;
wherein the feeder link signal comprises a higher order modulation than a lower order modulation of the upper layer signal and the lower layer signal such that a feeder link frequency band of the feeder link signal is no greater than a downlink frequency band of the upper layer signal and the lower layer signal. - View Dependent Claims (50, 51, 52, 53, 54, 67)
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55. A method of uplinking signals, comprising:
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receiving and demodulating a feeder link signal into a first bit stream;
demultiplexing the first bit stream into a second bit stream and a third bit stream;
modulating the second bit stream into an upper layer signal of a layered modulation signal for transmission to at least one receiver;
modulating the third bit stream into a lower layer signal of the layered modulation signal for transmission to the at least one receiver;
wherein the feeder link signal comprises a higher order modulation than a lower order modulation of the upper layer signal and the lower layer signal such that a feeder link frequency band of the feeder link signal is no greater than a downlink frequency band of the upper layer signal and the lower layer signal. - View Dependent Claims (56, 57, 58, 59, 60, 68)
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Specification