Digital signal with several reference blocks, for channel estimation; methods of channel estimation and corresponding receivers

The invention relates to a digital signal, organized in consecutive data streams each comprising a predetermined number of successive symbols, each of said data streams comprising at least two distinct reference blocks for the estimation of said channel, distributed among the useful symbols representative of the source signal to be transmitted, each of said reference blocks being formed by at least one reference symbol known to the receiver and / or identifiable by said receiver. The reference symbols present in the reference blocks of the invention may be explicit reference symbols, fixed and known a priori by said receiver and / or implicit reference symbols, produced by the links generated between the symbols used by a user. coding. The invention also relates to channel estimation methods, implementing an estimation-maximization algorithm and / or using a combination of predetermined basic functions, of a bandwidth greater than or equal to that of the Doppler power spectrum of said signal.