A method is described of selecting, by a multi-antenna base station of a wireless communications system, at least one transmission beam to transmit data to at least one terminal. The method can include determining a grid of N2 transmission beams intended to cover a portion of the space served by the base station and generated by using N1 antennas of the base station, where N1 and N2 designate integers such as N2>N1, and selecting one or more non-adjacent beam(s) of the grid to transmit data to at least one terminal during at least one given time interval.