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.