Adaptive Interference Nulling for MIMO Receiver Based on Interference Characteristics
First Claim
1. A method comprising:
- at a wireless device, analyzing energy received at a plurality of antennas in an unlicensed frequency band to detect interference in the unlicensed frequency band;
determining the type of interference detected in the received energy;
generating parameters for a nulling filter based on the type of interference detected in the received energy; and
during a time interval when it is expected to receive desired signals, applying the nulling filter using the parameters to signals obtained from energy received at the plurality of antennas during the time interval.
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Abstract
Interference in an unlicensed frequency band is spatially filtered out from received signals at a wireless device operating in the unlicensed frequency band. Energy received at a plurality of antennas of the wireless is device is analyzed to detect interference in the unlicensed frequency band. The detected interference is classified by type. Parameters for a nulling filter are generated or selected based on the type of interference detected in the received energy. During a time interval when it is expected to receive desired signals, the nulling filter is applied using the parameters to signals obtained from energy received at the plurality of antennas during the time interval.
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Citations
23 Claims
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1. A method comprising:
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at a wireless device, analyzing energy received at a plurality of antennas in an unlicensed frequency band to detect interference in the unlicensed frequency band; determining the type of interference detected in the received energy; generating parameters for a nulling filter based on the type of interference detected in the received energy; and during a time interval when it is expected to receive desired signals, applying the nulling filter using the parameters to signals obtained from energy received at the plurality of antennas during the time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
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a plurality of antennas; a radio receiver coupled to the plurality of antennas and configured to downconvert signals detected by the plurality of antennas in an unlicensed frequency band; a spectrum analyzer unit configured to analyze signals output by the radio receiver for at least one antenna to detect interference in the unlicensed frequency band; and a processor coupled to the spectrum analyzer unit and configured to; determine a type of interference detected in the signals; generate parameters for a nulling filter based on the type of interference detected in the received energy; and during a time interval when it is expected to receive desired signals, apply the nulling filter using the parameters to signals obtained from energy received at the plurality of antennas during the time interval. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. One or more computer readable storage media encoded with software comprising computer executable instructions and when the software is executed operable to:
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analyze signals output by the radio receiver for at least one of a plurality of antennas of a wireless device in an unlicensed frequency band to detect interference in the unlicensed frequency band; determine the type of interference in the signals; generate parameters for a nulling filter based on the type of interference detected in the received energy; and during a time interval when it is expected to receive desired signals, apply the nulling filter using the parameters to signals obtained from energy received at the plurality of antennas during the time interval. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification