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

摘要

The present invention relates to a method for transmitting a signal of a transmitting side in a wireless communication system that supports multiple antennas. More particularly, the method comprises the steps of: receiving, from a receiving side, feedback information for transmitting the signal of the transmitting side; and transmitting a signal to which a precoding matrix (W) is applied on the basis of the feedback information, wherein the precoding matrix (W) is expressed as a multiplication of two precoding matrices (W1 and W2), W1 is set to correspond to a plurality of antenna groups configured according to the feedback information, and W2 is configured such that the signal corresponding to the plurality of antenna groups can be transmitted in a mutual orthogonal way.

主权项

1. 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.