Method in a wireless repeater employing an antenna array for interference reduction
First Claim
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1. A method to reduce interference in a repeater for a wireless communication network, the repeater employing an antenna array including M antenna elements, the method comprising:
- receiving incoming receive signals on M receiver circuits associated with the M antenna elements;
generating correlation energy measurements indicative of a correlation of the receive signals and one or more reference signals;
selecting a desired receive signal, wherein the desired receive signal is a receive signal with the largest correlation energy measurement, excluding receive signals that are feedback signals of the repeater; and
calculating antenna weights for the M antenna elements using one of an error minimizing algorithm or an adaptive metric optimization algorithm;
applying the calculated antenna weights to the receive signals;
combining the weighted receive signals;
cancelling feedback signals from the combined signals; and
amplifying and transmitting echo cancelled signals as output signals on the antenna array of the repeater.
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Abstract
A wireless repeater with an antenna array determines the antenna weights to modify the spatial selectivity of the antenna array to reduce interference and improve the quality of signal reception. The antenna weights are determined using an error minimizing algorithm to minimize the error between a desired receive signal and a reference signal or an adaptive metric optimization algorithm to calculate adaptively antenna weights to minimize the signal-to-noise ratio of a desired receive signal.
10 Citations
28 Claims
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1. A method to reduce interference in a repeater for a wireless communication network, the repeater employing an antenna array including M antenna elements, the method comprising:
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receiving incoming receive signals on M receiver circuits associated with the M antenna elements; generating correlation energy measurements indicative of a correlation of the receive signals and one or more reference signals; selecting a desired receive signal, wherein the desired receive signal is a receive signal with the largest correlation energy measurement, excluding receive signals that are feedback signals of the repeater; and calculating antenna weights for the M antenna elements using one of an error minimizing algorithm or an adaptive metric optimization algorithm; applying the calculated antenna weights to the receive signals;
combining the weighted receive signals;
cancelling feedback signals from the combined signals; and
amplifying and transmitting echo cancelled signals as output signals on the antenna array of the repeater. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A repeater for a wireless communication network, the repeater employing an antenna array including M antenna elements, the repeater comprising:
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M receiver circuits coupled to receive incoming receive signals associated with the M antenna elements; an antenna weight computation module configured to generate correlation energy measurements indicative of a correlation of the receive signals and one or more reference signals, select a desired receive signal, wherein the desired receive signal is a receive signal with the largest correlation energy measurement, excluding receive signals that are feedback signals of the repeater, and calculate antenna weights for the M antenna elements using one of an error minimizing algorithm or an adaptive metric optimization algorithm; and an antenna weight application module configured to apply the calculated antenna weight to condition the receive signals, wherein the antenna weight application module is further configured to combine the weighted receive signals, cancel feedback signals from the combined weighted receive signals, and amplify and transmit the echo cancelled signals as output signals on the antenna array of the repeater. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A non-transitory computer readable medium having stored thereon computer executable instructions for performing at least the following acts:
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receiving input signals indicative of incoming receive signals received on M antenna elements of an antenna array of a repeater; generating correlation energy measurements indicative of a correlation of the receive signals and one or more reference signals; selecting a desired receive signal, wherein the desired receive signal is a receive signal with the largest correlation energy measurement, excluding receive signals that are feedback signals of the repeater; calculating antenna weights for the M antenna elements using one of an error minimizing algorithm or an adaptive metric optimization algorithm; applying the calculated antenna weights to the receive signals;
combining the weighted receive signals;
cancelling feedback signals from the combined signals; and
amplifying and transmitting echo cancelled signals as output signals on the antenna array of the repeater.
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28. A repeater for a wireless communication network, the repeater employing an antenna array including M antenna elements, the repeater comprising:
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means for receiving incoming receive signals associated with the M antenna elements; means for generating correlation energy measurements indicative of a correlation of the receive signals and one or more reference signals; means for selecting a desired receive signal, wherein the desired receive signal is a receive signal with the largest correlation energy measurement, excluding receive signals that are feedback signals of the repeater, and means for calculating antenna weights for the M antenna elements using one of an error minimizing algorithm or an adaptive metric optimization algorithm; and means for applying the calculated antenna weight to condition the receive signals, means for combining the weighted receive signals;
means for cancelling feedback signals from the combined signals; and
means for amplifying and transmitting echo cancelled signals as output signals on the antenna array of the repeater.
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Specification