Patent ID: 7609772

Claim:
An apparatus for optimally compensating in-phase/quadrature-phase imbalance in a zero-intermediate frequency (IF) orthogonal frequency division multiplexing (OFDM) receiver, comprising: a first compensator for generating a first received symbol by eliminating an interference component caused by a second distorted symbol on an (N s −m+1) th subcarrier from a first distorted symbol on an m th subcarrier using a predetermined first compensation coefficient in a received OFDM signal including N s subcarriers after a fast-Fourier-transform of the OFDM signal; a first hard decider for generating a first compensated symbol by performing a hard decision on the first received symbol; an error calculator for generating an error symbol by subtracting the first compensated symbol from the first received symbol; a second compensator for generating a second received symbol by eliminating an interference component caused by the first distorted symbol from the second distorted symbol using a predetermined second compensation coefficient; a second hard decider for generating a second compensated symbol by performing a hard decision on the second received symbol; and an adaptive controller for updating the first compensation coefficient for the first compensator based on the error symbol and the second compensation symbol.