Patent ID: 7010059

Claim:
A quadrature demodulator for high-speed wireless communication, comprising: an A/D converter for converting a received signals into a digital signal; a signal recovery unit for recovering carriers and symbol timing from the signal converted by the A/D converter and outputting a recovered signal; a decision unit for detecting the recovered signal output by the signal recovery unit, and performing a decision process on the recovered signal; an I/Q gain imbalance detector for detecting gain imbalances of I and Q-phase components from the recovered signal, wherein the I/Q gain imbalance detector computes a ratio of the I and Q-phase components to generate an output of an I/Q gain compensation value for compensating for the gain imbalances; and an I/Q gain compensator, disposed between the A/D converter and the signal recovery unit, for reflecting the I/Q gain compensation value output by the I/Q gain imbalance detector to the received signal.