Abstract: A method for optimising a coded modulation scheme with a given spectral efficiency for communication over a fading channel represented/identified by B fading gains, where B is an integer number expressing the ratio between a code word duration and the duration over which the fading remains constant. The fading gains belong to a B-dimensional space of fading gains.

Abstract: A method for optimising a coded modulation scheme with a given spectral efficiency for communication over a fading channel represented/identified by B fading gains, wherein B is an integer number expressing the ratio between a code word duration and the duration over which the fading remains constant. The fading gains belong to a B-dimensional space of fading gains.

Abstract: The invention provides a method of increasing by M, where M is any integer, the number N, where N is any integer greater than or equal to 2, of calls set up between a central unit and remote units of a code division multiple access network, N first group calls plus M second group calls being able to be set up simultaneously in this way and each using an internal spreading code and an external scrambling code. In accordance with the invention, first interference caused by first group calls in each second group call is synthesized and the first synthesized interference caused by first group calls is subtracted from each second group call. Similarly, a first interference caused by second group calls in each first group call is synthesized, and the first synthesized interference caused by second group calls is subtracted from each first group call.