Patent ID: 7876848

Claim:
A method for determining a transmission unit for data stream transmission in a wireless communication system in which multiple transmission and reception antennas are used and a receiver provides information on a data stream to be transmitted through a transmission unit, the method comprising the steps of: reverse-ordering combined weights for multiple transmission units based on fading values from the multiple transmission antennas to the multiple reception antennas; successively selecting transmission units for data stream transmission among the reverse-ordered transmission units; calculating a signal-to-interference plus noise ratio (“SINR”) for each of the selected transmission units for the data stream transmission and feeding back the SINR to a transmitter; and determining a modulation and coding scheme (MCS) for each of the selected transmission units and feeding back the MCS to the transmitter, wherein the method successively demodulates individual transmission data of the multiple transmission units in an order of transmission units with lower channel quality based on the SINR, wherein a low SINR is indicative of lower channel quality.