Patent ID: 7573954

Claim:
A method for compensating IQ imbalance, the method being utilized for compensating a phase imbalance and a gain imbalance between an in-phase carrier and a quadrature-phase carrier, the method comprising: mixing a radio frequency signal according to the in-phase carrier and quadrature-phase carrier, respectively, to generate an in-phase analog signal and a quadrature-phase analog signal, respectively, wherein a frequency offset exists between a carrier frequency of the RF signal and a frequency of the in-phase carrier and the frequency offset is also between the carrier frequency of the RF signal and a frequency of the quadrature-phase analog signal; calculating a gain compensation value and a phase compensation value according to the in-phase analog signal and the quadrature-phase analog signal, wherein the gain compensation value is calculated according to a first predetermined functional relationship that (1 +ε) 2 equals to a ratio of an average power of an in-phase digital signal to an average power of a quadrature-phase digital signal, wherein ε is the gain compensation value, the in-phase digital signal corresponds to the in-phase analog signal, and the quadrature-phase digital signal corresponds to the quadrature-phase analog signal; and utilizing the gain compensation value to compensate the gain imbalance and utilizing the phase compensation value to compensate the phase imbalance.