Apparatus for receiving signal and method of compensating phase mismatch thereof

A method of compensating a phase mismatch, comprising:

• generating a training signal corresponding to each of one or more frequency channels in a first operation mode and converging a first in-phase signal and a first quadrature-phase signal generated using the training signal for a reference time to obtain a phase mismatch compensation coefficient;
• obtaining the phase mismatch compensation coefficient from channels selected in the first operation mode and generating a look-up table using the obtained phase mismatch compensation coefficients;
• and
• compensating a phase mismatch of a second in-phase signal and a second quadrature-phase signal generated using a receiving signal in a second operation mode using the phase mismatch compensation coefficient extracted from the look-up table,
• wherein obtaining the phase mismatch compensation coefficient includes,
• combining the first in-phase signal and the first quadrature-phase signal with a feedback signal;
• generating a combined in-phase signal and a combined quadrature-phase signal by combining the combined first in-phase signal and the combined first quadrature-phase signal with a feedback in-phase signal and a feedback quadrature-phase signal;
• generating an absolute in-phase signal and an absolute quadrature-phase signal by determining an absolute value of the combined in-phase signal and the combined quadrature-phase signal, respectively;
• generating a determined in-phase signal by subtracting the absolute quadrature-phase signal from the absolute in-phase signal;
• determining a sign by extracting a sign from each of the combined in-phase signal and the combined quadrature-phase signal to perform an exclusive-OR operation on the extracted sign;
• determining a minimum value of the absolute value in-phase signal and the absolute value quadrature phase signal;
• setting the sign to the minimum value to generate a determined quadrature-phase signal;
• and
• combining the determined in-phase signal and the combined quadrature-phase signal with a delayed in-phase signal and a delayed quadrature-phase signal and determining a phase mismatch compensation coefficient by converging for a reference time.

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 operate in a first operation mode and a second operation mode such that in the first operation mode, the IQ signal generator is configured to generate a first in-phase signal and a first quadrature-phase signal based on the training signal, and in the second operation mode, the IQ signal generator is configured to generate a second in-phase signal and a second quadrature-phase signal based on a receiving signal;
• and
• an IQ mismatch compensator configured to operate in the first operation mode and the second operation mode such that, in the first operation mode, the IQ mismatch compensator is configured to obtain a phase mismatch compensation coefficient based on selected frequency channels from among the one or more frequency channels by causing the first in-phase signal and the first quadrature-phase signal to converge for a reference time, and configured to store the obtained phase mismatch compensation coefficient in a look-up table in the memory, and in the second operation mode, the IQ mismatch compensator is 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,
• 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.