The invention relates to a method for transmitting digital data over a communication channel, between a transmitting base including N transmitting antennas and K receivers. A carrier signal of frequency f
0 and M sub-carriers of index m are used, which are suitable for transmitting, in parallel, K digital data streams sk between the transmitting base and each receiver. The method includes a step in which N.M complex symbols t
n (m) are calculated from K.M symbols s
k (m), by t
n (m) = formula (I) α
k .H
k,n
* (m).s
k (m), where * denotes a complex conjugate value, H
k,n (m) is a complex value estimating the transfer function of the communication channel between the transmitting antenna n and the receiving antenna k, at a corresponding frequency of the sub-carrier m, and α
k is a standardizing coefficient.