encoded digital symbols are transmitted via a first pair of antennas and at least one second pair of antennas . the sets of symbols used for the transmission via the second pair of antennas are re - ordered temporally into subsets of symbols with respect to the symbols used for the first pair of antennas . for the first pair of antennas , there is used a signal subjected to encoding with a code - division - multiple - access code and subjected to spreading with a spreading code , and , likewise , for the second pair or pairs of antennas there are used signals subjected to encoding with respective code - division - multiple - access code and subjected to spreading with a respective spreading code . at least one between the respective code - division - multiple - access code and the respective spreading code used for the transmission via the second pair of antennas is different from the code - division - multiple - access code and from the spreading code used for the transmission via the first pair of antennas . the solution can be extended to the use of a plurality of second pairs of antennas in transmission and / or to the use of a plurality of antennas in reception .