Apparatus and method for adaptively correcting I/Q imbalance

A method for adaptively correcting I/Q imbalance, which is used in a receiver including a quadrature-phase signal interference predicting device, a summing device, an in-phase signal gain adapting device, a first multiplying device and a second multiplying device, for correcting a received I/Q imbalance signal having an in-phase signal and a quadrature-phase signal, to thus eliminate the I/Q imbalance, the method comprising:

• a quadrature-phase signal interference predicting step, which is executed by the quadrature-phase signal interference predicting device to compute an interference amount caused by interference from an imbalanced quadrature-phase signal to an imbalanced in-phase signal;
• a summing step, which is executed by the summing device to subtract the interference amount from the imbalanced in-phase signal to thus obtain a corrected in-phase signal without phase imbalance;
• an in-phase signal gain adapting step, which is executed by the in-phase signal gain adapting device to compare a power of output quadrature-phase signal, a power of output in-phase signal and a target to accordingly determine a quadrature-phase scaling factor and an in-phase scaling factor;
• and
• a multiplying step, which is executed by the first multiplying device to multiply the imbalanced quadrature-phase signal by the quadrature-phase scaling factor to thus obtain the output quadrature-phase signal, and is executed by the second multiplying device to multiply the corrected in-phase signal by the in-phase scaling factor to thus obtain the output in-phase signal.