Patent ID: 8619916

Claim:
An apparatus for receiving a signal, comprising: a memory; a training signal generator configured to generate a training signal corresponding to each of one or more frequency channels; an in-phase and quadrature-phase (IQ) signal generator configured to generate a first in-phase signal and a first quadrature-phase signal using the training signal in a first operation mode and generate a second in-phase signal and a second quadrature-phase signal using a received signal in a second operation mode; and an IQ mismatch compensator configured to cause the first in-phase signal and the first quadrature-phase signal generated in response to each of the one or more frequency channels to converge for a reference time in the first operation mode to obtain a phase mismatch compensation coefficient, configured to obtain the phase mismatch compensation coefficient with respect to selected frequency channels from among the one or more frequency channels and store the phase mismatch compensation coefficient in a look-up table in the memory, and configured to compensate the second in-phase signal and the second quadrature-phase signal using the phase mismatch compensation coefficient included in the look-up table in the second operation mode, after obtaining the phase mismatch compensation coefficient, wherein the IQ mismatch compensator includes, a feedback signal combiner configured to combine an inputted in-phase signal with a feedback in-phase signal and a feedback quadrature-phase signal outputted from an in-phase and quadrature-phase mismatch compensator to generate a combined in-phase signal, and configured to combine an inputted quadrature-phase signal with the feedback in-phase signal and the feedback quadrature-phase signal outputted from an in-phase and quadrature-phase mismatch compensator to generate a combined quadrature-phase signal, a signal determiner configured to generate a determined in-phase signal and a determined quadrature-phase signal by determining an absolute value of the combined in-phase signal and the combined quadrature-phase signal respectively, and a mismatch compensator configured to converge the determined in-phase signal and the determined quadrature-phase signal for a reference time in the first operation mode to extract the phase mismatch compensation coefficient, and configured to apply the phase mismatch compensation coefficient to the determined in-phase signal and the determined quadrature-phase signal in the second operation mode to compensate a phase mismatch.