Apparatus and method to calibrate amplitude and phase imbalance for communication receivers
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United States of America Patent
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Issued Date -
Jun 22, 2006
app pub date -
Dec 17, 2004
filing date -
Dec 17, 2004
priority date (Note) -
Abandoned
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Abstract
The present invention provides apparatus and method for calibrating I/Q imbalance in a direct conversion transmitter-receiver, including generating a complex sinusoidal signal with a center frequency at .omega..sub.i, sending the sinusoidal signal to the receiver and using FFT to estimate the I/Q the phase .phi., the gain imbalance .epsilon., and phase imbalance .theta.. The input signal is calibrated according to the estimated I/Q amplitude and phase imbalance.
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