Active interference suppression in a satellite communication system
First Claim
1. A method of suppressing co-channel interference in a satellite communication system, the satellite communication system including a receive antenna having a plurality of antenna elements, each antenna element arranged to provide a respective antenna element signal, the method comprising:
- digitising each antenna element signal, and processing each digitised antenna element signal to separate received signal components in respective frequency channels present in the element signal;
calculating complex weighting values for one or more of a plurality of beam signals derived from the received signal components in at least one of the frequency channels;
adjusting one or more of the derived beam signals in accordance with the calculated complex weighting values, in the at least one frequency channel; and
cancelling interference in at least one derived beam signal in said at least one frequency channel using the one or more adjusted derived beam signals to provide an interference suppressed output signal.
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Accused Products
Abstract
The invention relates to active interference suppression in a satellite communication system, particularly but not exclusively to an apparatus and method for using active interference suppression in order to suppress co-channel interference between user signals in the communication system. The communication system includes a receive or transmit antenna having a plurality of antenna elements, each antenna element associated with a respective antenna element signal. The method includes the steps of calculating complex weighting values for one or more of a plurality of beam signals, adjusting the beam signals in accordance with the calculated complex weighting values and cancelling co-channel interference in at least one of the beam signals using the one or more adjusted derived beam signals to provide an interference suppressed output signal. The complex weighting values can be calculated based on a constant modulus algorithm.
23 Citations
22 Claims
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1. A method of suppressing co-channel interference in a satellite communication system, the satellite communication system including a receive antenna having a plurality of antenna elements, each antenna element arranged to provide a respective antenna element signal, the method comprising:
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digitising each antenna element signal, and processing each digitised antenna element signal to separate received signal components in respective frequency channels present in the element signal; calculating complex weighting values for one or more of a plurality of beam signals derived from the received signal components in at least one of the frequency channels; adjusting one or more of the derived beam signals in accordance with the calculated complex weighting values, in the at least one frequency channel; and cancelling interference in at least one derived beam signal in said at least one frequency channel using the one or more adjusted derived beam signals to provide an interference suppressed output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus for suppressing co-channel interference in a satellite communication system, the satellite communication system including a receive antenna having a plurality of antenna elements, each antenna element arranged to provide a respective antenna element signal, the apparatus comprising:
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an analogue to digital converter for digitising each antenna element signal; a plurality of demultiplexers for processing each digitised antenna element signal to separate received signal components in respective frequency channels present in the element signal; a processing arrangement for calculating complex weighting values for one or more of a plurality of beam signals derived from the received signal components in at least one of the frequency channels; a plurality of complex weighting units for adjusting one or more of the derived beam signals to form cancellation signals in accordance with the calculated complex weighting values, in the at least one frequency channel; and a cancelling unit for cancelling interference in at least one derived beam signal in said at least one frequency channel using the one or more cancellation signals to provide an interference suppressed output signal. - View Dependent Claims (10, 11, 12, 21)
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13. A method of suppressing co-channel interference in a satellite communication system, the satellite communication system including an antenna having a plurality of antenna elements, each antenna element associated with a respective antenna element signal, the method comprising:
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generating a plurality of beam signals in each of a plurality of frequency channels, the beam signals corresponding to one or more of the antenna element signals; calculating complex weighting values for one or more of the beam signals in at least one of the frequency channels; adjusting one or more of the beam signals in accordance with the calculated complex weighting values, in the at least one frequency channel; and cancelling interference in at least one of the beam signals in said at least one frequency channel using the one or more adjusted beam signals to provide an interference suppressed output signal. - View Dependent Claims (14, 15, 16, 18, 19, 20, 22)
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17. Apparatus for suppressing co-channel interference in a satellite communication system, the satellite communication system including an antenna having a plurality of antenna elements, each antenna element associated with a respective antenna element signal, the apparatus comprising:
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a signal processing arrangement for generating a plurality of beam signals in each of a plurality of frequency channels, the beam signals corresponding to one or more of the antenna element signals; a processor arrangement for calculating complex weighting values for one or more of the beam signals in at least one of the frequency channels; a plurality of complex weighting units for adjusting one or more of the beam signals in accordance with the calculated complex weighting values, in the at least one frequency channel; and a cancelling unit for cancelling interference in at least one of the beam signals in said at least one frequency channel using the one or more adjusted beam signals to provide an interference suppressed output signal.
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Specification