Code allocation method in an MC-CDMA telecommunication system

Code allocation method for a mobile telecommunication system in which the symbols sent from a user (k) to a base station are spread with a spreading code or a combination of spreading codes (c(k,i)) before being modulated with a plurality (Ωk,i) of frequency carriers to produce a modulated signal (Sk) transmitted to said base station over a transmission channel, characterised in that for each of a plurality of available spreading codes or available combinations thereof (Λn1, Λn2, . . . , ΛnIk) a value of a first variable (PAPRk) characteristic of the dynamic range of said modulated signal (Sk) is determined, and that for each of a plurality of users a value of a second variable (αk) characteristic of the propagation loss incurred over the transmission channel of the user is determined, and that a spreading code or combination of spreading codes producing a high dynamic range is allocated to a user if the propagation loss over its transmission channel is low, whereas a spreading code or combination of spreading codes producing a low dynamic range is allocated to said user if the propagation loss over its transmission channel is high.