Method and apparatus for reducing interference between terrestrially-based and space-based broadcast systems
First Claim
Patent Images
1. A communications system, comprisinga first communications system having a plurality of substantially geosynchronous satellites broadcasting a first set of information signals to a first plurality of terrestrial receiver stations;
- the first communication system satellites including first communication system satellite having a first plurality of transponders transmitting a first subset of information signals on a first subset of the first plurality of broadcast bands at a first polarization and a second communication system satellite having a second plurality of transponders transmitting a second subset of the first set of information signals on a second subset of the first plurality of broadcast bands at a second polarization substantially isolated from the first polarization;
a second communications system having a plurality of terrestrially-based transmitters transmitting a second set of information signals to a second plurality of terrestrially-based terrestrial receiver stations, wherein the first set of information signals each have independent content from and are spatially and polarizationally diverse from the second set of information signals;
wherein the first set of information signals are broadcast via one or more of a first plurality of broadcast bands having guard bands therebetween; and
wherein the second set of information signals are broadcast on one or more of a second plurality of broadcast bands, each of the second plurality of broadcast bands associated with and substantially spanning one of the first information signal guard bands.
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Abstract
A system and method for reducing interference between communications systems sharing at a portion of at least some allocated frequency bands is described. The system comprises a first communication system broadcasting on a first set of broadcast bands having guard bands therebetween, and a second communications system broadcasting on a second set of broadcast bands substantially spanning the guard bands of the first communications system.
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Citations
26 Claims
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1. A communications system, comprising
a first communications system having a plurality of substantially geosynchronous satellites broadcasting a first set of information signals to a first plurality of terrestrial receiver stations; -
the first communication system satellites including first communication system satellite having a first plurality of transponders transmitting a first subset of information signals on a first subset of the first plurality of broadcast bands at a first polarization and a second communication system satellite having a second plurality of transponders transmitting a second subset of the first set of information signals on a second subset of the first plurality of broadcast bands at a second polarization substantially isolated from the first polarization; a second communications system having a plurality of terrestrially-based transmitters transmitting a second set of information signals to a second plurality of terrestrially-based terrestrial receiver stations, wherein the first set of information signals each have independent content from and are spatially and polarizationally diverse from the second set of information signals; wherein the first set of information signals are broadcast via one or more of a first plurality of broadcast bands having guard bands therebetween; and wherein the second set of information signals are broadcast on one or more of a second plurality of broadcast bands, each of the second plurality of broadcast bands associated with and substantially spanning one of the first information signal guard bands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of broadcasting a first set of information signals from a first communications system having a plurality of geosynchronous satellites to a first plurality of terrestrial receiver stations and a second set of information signals, independent in content and spatially diverse from the first set of information signals, from a second communications system having a plurality of terrestrially-based transmitters to a second set of terrestrial receiver stations, comprising the steps of:
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broadcasting the first set of information signals via one or more of a first plurality of broadcast bands having guard bands therebetween having substantially no information signal; and broadcasting the second set of information signals via one or more of a second plurality of broadcast bands, each of the second plurality of broadcast bands associated with and substantially spanning at least one of the first information signal guard bands. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A communications system, usable with a first communications system having a plurality of substantially geosynchronous satellites broadcasting a first set of information signals to a first plurality of terrestrial receiver stations wherein the first set of information signals are broadcast via one or more of a first plurality of broadcast bands having guard bands therebetween, comprising:
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a plurality of terrestrially-based transmitters transmitting a second set of information signals to a second plurality of terrestrial receiver stations; wherein the first set of information signals each have independent content from and ate spatially diverse from the second set of information signals; and wherein the second set of information signals are broadcast on a second plurality of broadcast bands, each of the second plurality of broadcast bands associated with and substantially spanning one of the first information signal guard bands. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. An apparatus for broadcasting a first set of information signals from a first communications system having a plurality of geosynchronous satellites to a first plurality of terrestrial receiver stations and a second set of information signals, independent in content and spatially diverse from the first set of information signals, from a second communications system having a plurality of terrestrially-based transmitters to a second set of terrestrial receiver stations, comprising:
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means for broadcasting the first set of information signals via one or more of a first plurality of broadcast bands having guard bands therebetween having substantially no information signal; and means for broadcasting the second set of information signals via one or more of a second plurality of broadcast bands, each of the second plurality of broadcast bands associated with and substantially spanning one of the first information signal guard bands.
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Specification