Modulation and coding for a high altitude platform
First Claim
1. A telecommunications platform apparatus comprising:
- a gateway antenna configured to communicate with a ground-based gateway station;
a plurality of user antennas configured to provide communication coverage among a plurality of terminals within a specified area on the ground or in the air, each user antenna being configured to communicate with a specified cell within the specified area; and
a processor configured to;
demodulate and decode a first modulation scheme and a first coding scheme used for a feeder link provided by the gateway antenna, andapply at least a second modulation scheme and a second coding scheme for user links provided in spot beams by the respective user antennas,wherein the first modulation scheme and the first coding scheme is configured to be relatively more spectrally efficient for the feeder link compared to the second modulation scheme and the second coding scheme for the user links.
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Accused Products
Abstract
Modulation and coding for a high altitude platform is disclosed. An example apparatus includes a gateway antenna configured to communicate with a ground-based gateway station and user antennas configured to provide communication coverage among a plurality of terminals within a specified area on the ground or in the air. Each user antenna is configured to communicate with a cell within the specified area. The example apparatus also includes a processor configured to demodulate and decode a first modulation scheme and a first coding scheme used for a feeder link provided by the gateway antenna, and apply at least a second modulation scheme and a second coding scheme for user links provided in spot beams by the user antennas. The first modulation scheme and the first coding scheme are configured to be relatively more spectrally efficient compared to the second modulation scheme and the second coding scheme for the user links.
13 Citations
35 Claims
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1. A telecommunications platform apparatus comprising:
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a gateway antenna configured to communicate with a ground-based gateway station; a plurality of user antennas configured to provide communication coverage among a plurality of terminals within a specified area on the ground or in the air, each user antenna being configured to communicate with a specified cell within the specified area; and a processor configured to; demodulate and decode a first modulation scheme and a first coding scheme used for a feeder link provided by the gateway antenna, and apply at least a second modulation scheme and a second coding scheme for user links provided in spot beams by the respective user antennas, wherein the first modulation scheme and the first coding scheme is configured to be relatively more spectrally efficient for the feeder link compared to the second modulation scheme and the second coding scheme for the user links. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A telecommunications platform apparatus comprising:
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a gateway antenna configured to communicate with a ground-based gateway station via a feeder link; a plurality of user antennas configured to provide communication coverage among a plurality of terminals within a specified area on the ground or in the air, each user antenna being configured to communicate with a specified cell within the specified area via a respective user link; a processor including a forward baseband processor having; a front-end component, during a reception time period having a duration of (1-α
), configured to;receive a forward feeder link signal from the gateway antenna received via the feeder link, demodulate a first modulation scheme on the forward feeder link signal, decode a first coding scheme on the demodulated forward feeder link signal, and cause a switch to route the decoded forward feeder link signal to at least one forward user spot beam signal related to one of the user links based on a time plan; and a back-end component, during a transmission time period having a duration of α
, configured to;perform error correction coding using a second coding scheme on the switched forward user spot beam signal, modulate using a second modulation scheme the coded forward user spot beam signal, and transmit the modulated forward user spot beam signal via one of the plurality of user antennas, wherein the first modulation scheme and the first coding scheme is configured to be relatively more spectrally efficient than the second modulation scheme and the second coding scheme. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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27. A telecommunications platform apparatus comprising:
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a first gateway antenna configured to communicate with a first ground-based gateway station via a first feeder link; a second gateway antenna configured to communicate with a second ground-based gateway station via a second feeder link; a plurality of user antennas configured to provide communication coverage among a plurality of terminals within a coverage area on the ground, each user antenna being configured to communicate with a specified cell within the coverage area via respective user links; and a forward baseband processor including; a front-end component, during a reception time period having the duration of (1-α
), configured to;receive a first forward feeder link signal from the first gateway antenna, receive a second forward feeder link signal from the second gateway antenna, demodulate the first and second forward feeder link signals using a first modulation scheme, decode the demodulated forward feeder link signals using a first coding scheme, and de-multiplex the decoded forward feeder link signals; and a back-end component, during a transmission time period having the duration of α
, configured to;multiplex, for at least one forward user spot beam signal, a portion of the decoded forward feeder link signal with portions of other decoded feeder link signals within a buffer, code the multiplexed forward user spot beam signal using a second coding scheme, modulate the coded forward user spot beam signal using a second modulation scheme, and transmit the modulated forward user spot beam signal via one of the plurality of user antennas, wherein the first modulation scheme and the first coding scheme is configured to be relatively more spectrally efficient to enable an uplink frequency band of the first and second forward feeder link signals to provide the total data rate needed by all forward downlinks provided the plurality of user antennas using the second modulation scheme and the second coding scheme. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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Specification