A base station that supports a frame transmission method using a pre-coding and the method for supporting the Mu-mimo

Using precoding to support the MU-MIMO according to an aspect of the invention, which can reduce the overhead of the downlink frame in a communication system of FDD-type frame, the transmission method is the channel state information of the respective nodes (Channel State Information: CSI) and on the basis of the pre-coding (precoding matrix) matrix of the previous frame, calculating a precoding matrix of the current frame; The step of pre-encoding the downlink data and a dedicated pilot (Pilot Dedicate) for each terminal to be sent to the UE using a precoding matrix of the current frame; And transmitting a downlink frame including a downlink data precoding a dedicated pilot (Pilot Precoded Dedicate) and the pre-coded in the terminal. Pilot, private, public, pre-coding, overhead