1. A method of grouping a predetermined number NG of transmitter-receiver pairs for communicating over a communications network, said method comprising: for each group of a determined set of groups comprising NG transmitter-receiver pairs: an execution process in which the NG pairs of said group execute an iterative interference alignment technique for a predetermined number I1 of iterations on the signals transmitted by said group; a sending process in which each transmitter of the NG pairs of said group sends a pilot signal precoded with the help of a matrix resulting from executing said iterative interference alignment technique, the transmitters of the NG pairs of said group successively transmitting the pilot signals; and an evaluation process in which each receiver of the NG pairs of said group evaluate a metric representative of a distance between a vector subspace generated by the precoded pilot signal transmitted by the transmitter with which the receiver forms a transmitter-receiver pair and a vector subspace generated by the interferences affecting the pilot signal as determined from the precoded pilot signals transmitted by the other transmitters of the group; a calculation process in which a central unit of the network calculates a global metric associated with each group of the determined set of groups on the basis of the metrics evaluated by the receivers of the NG pairs of the group; and a selection process in which the central unit selects from the determined set of groups a group that optimizes the global metric for communicating over the network.