Distortion compensation in wireless digital communication
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United States of America Patent
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Mar 30, 2010
Grant Date -
Feb 22, 2007
app pub date -
Dec 27, 2005
filing date -
Aug 17, 2005
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Abstract
A distortion compensating technique applied to a transmitter for transmitting a quadrature modulated signal in a wireless digital communication system is provided. A phase adjustment value is determined for a quadrature demodulated feedback signal based on comparison between the feedback signal and a reference signal to be transmitted from the transmitter. This phase adjustment value is compared with the previous phase adjustment value. If the comparison result between the current and previous phase adjustment values satisfies a prescribed condition, correction for quadrature modulation, such as DC offset correction, orthogonality correction, or IQ amplitude correction, is performed.
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