Patent ID: 8767858

Claim:
A transmission apparatus to transmit data, comprising common control information, individual control information, and a data field, to terminals comprising at least one receive antenna, the transmission apparatus comprising: a common control information generator configured to generate the common control information with respect to the terminals; an individual control information generator configured to generate the individual control information with respect to each of the terminals; a precoder configured to generate precoded data with respect to each of the terminals by precoding the individual control information and the data field with respect to each of the terminals; a transmitter configured to transmit, to the terminals, a data frame comprising the common control information and the precoded data according to a multi-user multiple input multiple output (MU-MIMO) communication method, and a power amplifier training signal generator configured to generate a power amplifier training signal for a multi-antenna automatic gain control (AGC) of each of the terminals, wherein the precoder is further configured to generate the precoded data by additionally precoding the power amplifier training signal.