ADAPTIVE BEAM FORMING WITH MULTI-USER DETECTION AND INTERFERENCE REDUCTION IN SATELLITE COMMUNICATION SYSTEMS AND METHODS
First Claim
1. A communications method comprising:
- receiving at a space-based component over a space-based component frequency band a plurality of signals including interference that is dependent on transmissions of a plurality of terminals communicating with the space-based component over a geographic area and interference that is independent of the transmissions of the plurality of terminals communicating with the space-based component over the geographic area; and
reducing interference of the plurality of signals sequentially by first reducing the interference that is independent of the transmissions of the plurality of terminals communicating with the space-based component over the geographic area and then reducing the interference that is dependent on the transmissions of the plurality of terminals communicating with the space-based component over the geographic area.
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Abstract
Satellite communications methods include receiving communications signals including co-channel interference at a space-based component from a plurality of wireless terminals in a satellite footprint over a satellite frequency band and reducing interference in the communication signals by (a) performing co-channel interference reduction on the communications signals to generate a plurality of interference reduced signals and (b) performing multiple access interference cancellation on the interference reduced signals. An interference reducing detector for a satellite communications system includes an interference reducer configured to perform co-channel interference reduction on communications signals to generate a plurality of interference reduced signals, and a detector configured to perform multiple access interference cancellation on the interference reduced signals. Satellite communications systems and satellite gateways including interference reducing detectors are also disclosed.
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Citations
31 Claims
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1. A communications method comprising:
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receiving at a space-based component over a space-based component frequency band a plurality of signals including interference that is dependent on transmissions of a plurality of terminals communicating with the space-based component over a geographic area and interference that is independent of the transmissions of the plurality of terminals communicating with the space-based component over the geographic area; and reducing interference of the plurality of signals sequentially by first reducing the interference that is independent of the transmissions of the plurality of terminals communicating with the space-based component over the geographic area and then reducing the interference that is dependent on the transmissions of the plurality of terminals communicating with the space-based component over the geographic area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 30, 31)
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16. A system comprising:
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a plurality of terminals that are configured to transmit a plurality of multiple access signals over a space-based component frequency band in a space-based component footprint; a space-based component that is configured to receive the plurality of multiple access signals over the space-based component frequency band, the space-based component also receiving interference along with the plurality of multiple access signals in the space-based component frequency band, the interference comprising a component that is dependent on the plurality of multiple access signals and a component that is independent of the plurality of multiple access signals; and an interference reducing element that is responsive to the space-based component, and that is configured to sequentially perform interference reduction of the interference that is independent of the plurality of multiple access signals and the interference that is dependent on the plurality of multiple access signals. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An interference reducer for a space-based component that is configured to receive waveforms from radioterminals including interference that is dependent on the waveforms from the radioterminals and interference that is independent of the waveforms from the radioterminals, wherein the interference reducer is configured to reduce the interference that is independent of the waveforms from the radioterminals and to reduce the interference that is dependent on the waveforms from the radioterminals;
- and wherein the interference reducer is configured to reduce the interference that is dependent on the waveforms from the radioterminals repeatedly until a predetermined criterion is met.
Specification