Adaptive interference nulling for MIMO receiver based on interference characteristics
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United States of America Patent
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Mar 18, 2014
Grant Date -
Oct 18, 2012
app pub date -
Apr 14, 2011
filing date -
Apr 14, 2011
priority date (Note) -
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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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