The present invention relates to a group (G1, G2) of at least two transceiver units (1, 2; 3, 4) in at least one wireless communication system. The transceiver units (1, 2; 3, 4) in the group (G1, G2) are arranged for wireless communication with at least one other transceiver unit. The transceiver units (1, 2; 3, 4) in the group (G1, G2) are arranged to transmit signals with polarizations that are essentially parallel to each other when received by at least one transceiver unit for which the transmitted signals (5, 6) constitutes interference.