A method for obtaining a steering matrix Q to be applied for MU-MIMO transmission of data for a MU-MIMO communication system which comprises at least a transmitter comprising at least NTX=2 transmit antennas and K=2 receivers with each dth receiver comprising NRX(d) receive antennas, respectively, wherein Σd NRX(d)≥NTX. The method is implemented at the level of the transmitter. The obtained steering matrix Q to be applied for DL-MU-MIMO transmission allows of supporting extended configurations of a DL-MU-MIMO communication system and allows of improving significantly the quality of subsequent DL-MU-MIMO transmissions, when the number of receive antennas Σd NRX(d) is larger than the number NTX of transmit antennas.