Apparatus and method for detecting I/Q channel imbalance in direct conversion digital quadrature transmission system
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United States of America Patent
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Apr 24, 2007
Grant Date -
Jun 9, 2005
app pub date -
Jul 12, 2004
filing date -
Dec 8, 2003
priority date (Note) -
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Abstract
An apparatus and a method for detecting imbalances between an I-channel signal and a Q-channel signal in order to suppress a spurious signal in a direct conversion digital quadrature transmission system is disclosed. The apparatus includes: a compensation signal generating unit for generating a first and a second compensation signals based on a digital I-channel and a digital Q-channel signals; a baseband signal generating unit for generating an I-channel and a Q-channel baseband signals by converting a radio frequency signal into a low frequency signal; and a detecting unit for detecting a phase imbalance and an amplitude imbalance between the digital I-channel and the digital Q-channel signals by using a correlation between the first and the second compensation signals with the I-channel and the Q-channel baseband signals.
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