Method for calibrating an array antenna in a wireless communication system and apparatus thereof

An apparatus for calibrating an array antenna in a wireless communication system, the apparatus comprising:

• an array antenna;
• one or more transceivers configured to transmit or receive a radio signal through the array antenna;
• a plurality of coupling antennas configured to measure the radio signal;
• a plurality of power detectors coupled to the plurality of coupling antennas;
• one or more processors configured to control the apparatus;
• and
• one or more memories operatively coupled to the one or more processors and configured to store instructions for performing operations when a calibration of the array antenna is executed by the one or more processors,
• wherein the operations include:
• a first step of transmitting a radio signal through a first antenna and a second antenna determined among a plurality of antennas included in the array antenna;
• a second step of measuring the radio signal through a specific coupling antenna of a plurality of coupling antennas adjacent to the plurality of antennas;
• a third step of estimating an error of the second antenna based on a result of the measurement of the radio signal;
• and
• a fourth step of calibrating the second antenna based on the error,
• wherein the first step to the fourth step are repeatedly performed until a calibration of the plurality of antennas is completed,
• wherein the first antenna is a reference antenna or the second antenna on which the calibration has already been performed, and
• wherein the second antenna is an antenna which is adjacent to the first antenna and on which the calibration has not been performed.

One or more non-transitory computer-readable media storing one or more commands, wherein one or more commands executable by one or more processors are configured to enable an apparatus to perform:

• a first step of transmitting a radio signal through a first antenna and a second antenna determined among a plurality of antennas included in the array antenna;
• a second step of measuring the radio signal through a specific coupling antenna of a plurality of coupling antennas adjacent to the plurality of antennas;
• a third step of estimating an error of the second antenna based on a result of the measurement of the radio signal;
• and
• a fourth step of calibrating the second antenna based on the error,
• wherein the first step to the fourth step are repeatedly performed until a calibration of the plurality of antennas is completed,
• wherein the first antenna is a reference antenna or the second antenna on which the calibration has already been performed, and
• wherein the second antenna is an antenna which is adjacent to the first antenna and on which the calibration has not been performed.