A communication method is implemented in a transmission system comprising an emitter and a set of receivers. The method comprises, for at least one time-frequency resource, receiving, from each of the receivers, at least one piece of information relating to a technique for acquiring knowledge of the transmit channel. At least one of said receivers is configured to return to said emitter information relating to a first technique for acquiring knowledge of the transmit channel. At least one of said receivers is configured to return to said emitter information relating to a second technique for acquiring knowledge of the transmit channel. The method further comprises the selection, from said information received from the receivers, of a subset of receivers, included in the set of receivers, to which the emitter is configured to emit data on said at least one time-frequency resource.