A training sequence is pre-filtered in a radiocommunication system having
an emitter in the form of an antenna device with several antenna systems,
thereby making it possible to transmit the training sequences through a
pre-filter to said antenna systems side for reradiation by the emitter.
Estimation enabling to form the properties of radio transmission channels
described by spatial correlations is formed. Said prefilter is
dimensioned according to said correlations, thereby minimizing the error
value of an algorithm used for estimation the channel on a reception
side.