Patent ID: 7428248
Filing Date: 2008-09-23
Classification: H04J,H04L

Abstract:
1. 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 (Ω k,i ) of frequency carriers to produce a modulated signal (S k ) 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 (Λ n , Λ n , . . . ,Λ nI ) a value of a first variable (PAPR k ) characteristic of the dynamic range of said modulated signal (S k ) is determined, and that for each of a plurality of users a value of a second variable (α k ) 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.