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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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
90 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, 72, 73)
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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. A system comprising:
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a space-based component that is configured to receive multiple access signals from a plurality of terminals in a satellite footprint over a satellite frequency band;
an interference reducer that is responsive to the space-based component and is configured to perform co-channel interference reduction on the multiple access signals to generate a plurality of interference reduced signals; and
a detector that is responsive to the interference reducer and is configured to perform multiple access interference reduction on the interference reduced signals. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. An interference reducing detector for a satellite communications system that includes a space-based component that is configured to receive multiple access wireless communication signals including co-channel interference from a plurality of wireless terminals in a satellite footprint over a satellite frequency band, the interference reducing detector comprising:
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an interference reducer that is responsive to the space-based component and that is configured to perform co-channel interference reduction on the multiple access wireless communication signals to generate a plurality of interference reduced signals; and
a detector that is configured to perform multiple access interference cancellation on the interference reduced signals. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A gateway for a satellite wireless terminal system that includes a space-based component that is configured to receive multiple access wireless communication signals from a plurality of wireless terminals in a satellite footprint over a satellite frequency band, the gateway comprising:
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an interference reducer that is responsive to the space-based component and that is configured to perform co-channel interference reduction on the multiple access wireless communication signals to generate a plurality of interference reduced signals; and
a detector that is configured to perform multiple access interference cancellation on the interference reduced signals. - View Dependent Claims (56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
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66. An interference reducer for a space-based component that is configured to receive components of a signal using at least first and second antenna patterns that differ in a spatial orientation and a polarization orientation, wherein the space-based component is configured to provide the components of the signal to the interference reducer and the interference reducer is configured to process the components of the signal to reduce a level of interference of the signal.
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67. A transmitter for a space-based component configured to communicate with a radioterminal by transmitting to the radioterminal a first signal over a first antenna pattern and at least one second signal over at least a second antenna pattern, wherein the at least one second signal differs from the first signal by at least a time delay value.
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68. A radioterminal configured to communicate with a space-based component by receiving a first signal over a first antenna pattern of the space-based component and at least one second signal over at least a second antenna pattern of the space-based component, wherein the at least one second signal differs from the first signal by at least a time delay value;
- the radioterminal configured to process the first signal and the at least one second signal to improve at least one communications performance measure.
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69. A wireless communications system comprising a space-based component and an ancillary terrestrial network, wherein the ancillary terrestrial network provides control channel and traffic channel communications to a plurality of first radioterminals by using a first set of frequencies authorized for use by the space-based component to provide control channel and/or traffic channel communications more than a second set of frequencies authorized for use by the space-based component to provide control channel and/or traffic channel communications;
- wherein the second set of frequencies is used preferentially by the space-based component to provide control channel and traffic channel communications to a plurality of second radioterminals within a geographic area.
- View Dependent Claims (70)
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71. 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.
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74. A method of reducing interference, comprising:
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receiving, at a space-based component, components of a signal using at least first and second antenna patterns that differ in a spatial orientation and a polarization orientation;
providing the components of the signal to an interference reducer; and
processing the components of the signal at the interference reducer to reduce a level of interference of the signal.
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75. A method of communicating between a space-based component and a radioterminal, comprising:
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transmitting a signal to the radioterminal as a first signal over a first antenna pattern; and
transmitting the signal to the radioterminal as a second signal over at least a second antenna pattern, wherein the second signal differs from the first signal by at least a time delay value. - View Dependent Claims (76, 77, 78)
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79. A method of communicating between a space-based component and a radioterminal, comprising:
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transmitting a signal to the radioterminal as a first signal over a first antenna pattern; and
transmitting the signal to the radioterminal as a second signal over at least a second antenna pattern, wherein the second signal differs from the first signal by a unique characteristic. - View Dependent Claims (80)
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81. A method of communicating with a space-based component, comprising:
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receiving a first signal over a first antenna pattern of the space-based component and at least one second signal over at least a second antenna pattern of the space-based component, wherein the at least one second signal differs from the first signal by at least a time delay value; and
processing the first signal and the at least one second signal to improve at least one communications performance measure.
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82. A communications method for a wireless communications system comprising a space-based component and an ancillary terrestrial network, the method comprising:
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providing control channel and traffic channel communications from the ancillary terrestrial network to a plurality of first radioterminals using a first set of frequencies authorized for use by the space-based component to provide control channel and/or traffic channel communications more than a second set of frequencies authorized for use by the space-based component to provide control channel and/or traffic channel communications; and
providing control channel and traffic channel communications from the space-based component to a plurality of second radioterminals within a geographic area using the second set of frequencies. - View Dependent Claims (83)
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84. A method of reducing interference, comprising:
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receiving, at a space-based component, a plurality of components of a signal using a respective plurality of different antenna patterns;
selecting a subset of the received signal components for processing;
providing the selected subset of the received signal components to an interference reducer; and
processing the selected subset of the received signal components at the interference reducer to reduce a level of interference of the signal. - View Dependent Claims (85, 86, 87, 88, 89, 90)
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Specification