Multiple-input multiple-out communication system and method for transmit and receive data in the system and apparatus thereof

The present invention relates to a data transmitting and receiving method of a MIMO communication system and its apparatus. Data transmission and reception method of the transmitting device to the receiving device, and communication with multiple receive antennas and having multiple transmit antennas in a MIMO communication system according to the invention, the receiving apparatus the available channel information on the channel formed at the transmitting device to the receiving device and the process of setting multiple transmission antennas to be allocated to the channel according to the result of the process, and the received effective channel information QR decomposition and, QR decomposition for receiving from, the process for transmitting data using multiple transmit antennas set It includes, and is characterized in effective channel information, that by the receiving apparatus according to the effective MISO channel matrix SVD, QR decomposition, MIMO