METHOD FOR DOWNLINK BEAMFORMING IN WIRELESS ACCESS SYSTEM AND DEVICE THEREFOR

摘要

A method for downlink beamforming in a wireless access system and a device therefor are disclosed. Specifically, the method comprises the following steps: transmitting, by an eNB, a reference signal to a UE through only a first antenna set from among whole antennas; receiving, by the eNB, channel state information (CSI) for the first antenna set from the UE; and transmitting, by the eNB, beamforming a downlink channel by using a precoding matrix for the whole antennas, wherein CSI for a second antenna set by which the reference signal has not been transmitted from among the whole antennas is calculated using the CSI for the first antenna set.

主权项

1. A method of performing downlink beamforming in a wireless access system, comprising the steps of:
transmitting, by a base station, a reference signal to a user equipment via a first antenna set; receiving, by the base station, channel state information (CSI) on the first antenna set from the user equipment; and transmitting, by the base station, a downlink channel to the user equipment in a manner of beamforming the downlink channel using a precoding matrix for the first antenna set and a second antenna set, wherein CSI on the second antenna set, which has not transmitted the reference signal, is calculated using the CSI on the first antenna set.