Method for configuring codebook in multi-antenna wireless communication system and device therefor

An apparatus for transmitting a signal in a wireless communication system supporting multiple antennas including a multitude of vertical domain antennas and a multitude of horizontal domain antennas, the apparatus comprising:

• a radio frequency unit;
• and
• a processor coupled to the radio frequency unit,
• wherein the processor is configured to precode a signal for the multiple antennas using a specific precoding matrix selected on the basis of a first codebook for a multitude of of the vertical domain antennas and a second codebook for a multitude of the horizontal domain antennas and transmit the precoded signal to a receiving end and
• wherein the specific precoding matrix is defined by using a Kronecker product of a first precoding matrix selected from the first codebook according to at least one first selection vector and a second precoding matrix selected from the second codebook according to at least one second selection vector, and
• wherein a feedback period of the at least one first selection vector is set longer than that of the at least one second selection vector.