1. A method for dynamically controlling a focus of a signal pre-equalized by time reversal of an estimated propagation channel between a source antenna of a source communicating entity and a destination antenna of a destination communicating entity at a current instant, the method comprising steps for: evaluating, by the destination communicating entity, a relative focus quality of the pre-equalized signal sent by the source antenna and received by the destination antenna, compared to a quality at a focal point, and if the evaluated relative focus quality does not satisfy a predetermined criterion, requesting, by the destination communicating entity, to modify the focus addressed to the source communicating entity for a subsequent instant.