Cancelling non-linear power amplifier induced distortion from a received signal by moving incorrectly estimated constellation points
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United States of America Patent
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Jan 15, 2013
Grant Date -
Mar 31, 2011
app pub date -
Sep 25, 2009
filing date -
Sep 25, 2009
priority date (Note) -
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Abstract
A method and system are provided for reducing power amplifier induced distortion. Power amplifier induced distortion is iteratively estimated and cancelled. When the difference between the current estimated power amplifier distortion and the previous estimated power amplifier distortion is less than a convergence threshold, particular M-QAM constellation points that are still in error are determined A M-QAM constellation point correction routine is provided that can move the incorrectly estimated M-QAM constellation points that are in error towards their expected quadrants by generating updated M-QAM constellation points. The remaining estimated non-linear power amplifier induced distortion in the received signal can then be estimated and canceled.
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