Method for detecting and correcting amplitude and phase imbalances between I and Q components in quadrature demodulator

A quadrature demodulator for high-speed wireless communication comprising:

• a multiplier for performing carrier frequency offset correction and signal magnitude correction on signals received through an antenna;
• an amplitude and phase imbalance corrector for correcting the amplitude and phase imbalances of the signals output from the multiplier, and outputting them;
• a carrier phase detector for detecting a phase of the carrier from the signals output from the amplitude and phase imbalance corrector;
• an amplitude and phase imbalance detector for comparing the signals output from the carrier phase detector with the signals determined by the quadrant to which the signals belong, detecting the amplitude and phase imbalances of the signals between I and Q components, and outputting them to the amplitude and phase imbalance corrector;
• and
• a symbol decision unit for extracting symbol values from the signals output from the carrier phase detector, and outputting them.