Method for transmitting efficient feedback in multi-antenna wireless communication system and apparatus therefor

A method for transmitting a signal by a base station in a wireless communication system supporting a two-dimensional active antenna, comprising:

• receiving, from a user equipment, feedback information for transmitting the signal;
• configuring, by the base station, a precoding matrix W as a result of a product of two precoding matrices W1 and W2,
• wherein W1 is set to maximize a sum of channel gains corresponding to a plurality of antenna groups configured according to the feedback information, and
• wherein W2 is configured such that signals corresponding to the plurality of antenna groups are transmitted in a mutually orthogonal manner;
• and
• transmitting, by the base station, the signal to which the precoding matrix W has been applied on the basis of the feedback information,
• wherein each of the plurality of antenna groups respectively includes a different number of antennas and has different antenna indices, and
• wherein the plurality of antenna groups are configured on the basis of channel correlation thereof.