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 transceiver of a given terminal over a frequency band a plurality of signals including multiple access interference that is dependent on transmissions of a plurality of terminals other than the given terminal, the plurality of terminals communicating with the transceiver over a geographic area, and receiving at the transceiver co-channel interference that is independent of the transmissions of the plurality of terminals other than the given terminal; and
reducing interference of the plurality of signals sequentially by first reducing the co-channel interference that is independent of the transmissions of the plurality of terminals other than the given terminal to generate a plurality of interference reduced signals, and then reducing the multiple access interference in the plurality of interference reduced signals that is dependent on the transmissions of the plurality of terminals other than the given terminal, after the first reducing the co-channel interference;
wherein reducing the multiple access interference that is dependent on the transmissions of the plurality of terminals other than the given terminal after the first reducing the co-channel interference comprises generating a set of channel estimates based on the co-channel interference reduced signals, generating a set of bit estimates from the co-channel interference reduced signals, and performing multiple access interference reduction on the co-channel interference reduced signals using the set of channel estimates and the bit estimates.
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Accused Products
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
25 Claims
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1. A communications method comprising:
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receiving at a transceiver of a given terminal over a frequency band a plurality of signals including multiple access interference that is dependent on transmissions of a plurality of terminals other than the given terminal, the plurality of terminals communicating with the transceiver over a geographic area, and receiving at the transceiver co-channel interference that is independent of the transmissions of the plurality of terminals other than the given terminal; and reducing interference of the plurality of signals sequentially by first reducing the co-channel interference that is independent of the transmissions of the plurality of terminals other than the given terminal to generate a plurality of interference reduced signals, and then reducing the multiple access interference in the plurality of interference reduced signals that is dependent on the transmissions of the plurality of terminals other than the given terminal, after the first reducing the co-channel interference; wherein reducing the multiple access interference that is dependent on the transmissions of the plurality of terminals other than the given terminal after the first reducing the co-channel interference comprises generating a set of channel estimates based on the co-channel interference reduced signals, generating a set of bit estimates from the co-channel interference reduced signals, and performing multiple access interference reduction on the co-channel interference reduced signals using the set of channel estimates and the bit estimates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system comprising:
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a transceiver; a plurality of terminals that are configured to transmit a plurality of multiple access signals over a frequency band in a footprint of the transceiver; the transceiver being configured to receive the plurality of multiple access signals over the frequency band, the transceiver also receiving interference along with the plurality of multiple access signals in the frequency band, the interference comprising a multiple access component that is dependent on the plurality of multiple access signals and a co-channel component that is independent of the plurality of multiple access signals; and an interference reducing element that is responsive to the transceiver, and that is configured to sequentially perform interference reduction of the co-channel interference that is independent of the plurality of multiple access signals to generate a plurality of interference reduced signals and then to perform multiple access interference reduction on the plurality of interference reduced signals to reduce the multiple access interference that is dependent on the plurality of multiple access signals after performing the interference reduction of the co-channel interference, wherein the interference reducing element is configured to generate a set of channel estimates based on the co-channel interference reduced signals, generate a set of bit estimates from the co-channel interference reduced signals, and perform multiple access interference reduction on the co-channel interference reduced signals using the set of channel estimates and the bit estimates. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification