MULTICARRIER MODULATION USING WEIGHTED PROTOTYPE FUNCTIONS

摘要

The invention concerns a method for providing a signal with multicarrier modulation of density 1/( nu 0. tau 0)=2, formed by successive symbols, each comprising M samples to be transmitted, and consisting of a set of 2M orthogonal carrier frequencies in the real sense, the interval between two neighbouring frequencies being equal to nu 0 and the interval between the transmitting times of two consecutive symbols, or symbol time, being equal to tau 0, each of said carrier frequencies being modulated according to a common modulation prototype function g(t) with a truncation length of 2L tau 0, said method comprising, at each symbol time, the following steps: obtaining a set of 2M complex coefficients representing data to be transmitted; computing 2LM linear combinations from said resulting 2M complex coefficients, the weighting coefficients used in said combinations representing said prototype function g(t), so as to obtain 2Lm coefficients; summing said 2LM weighted coefficients in predetermined storage locations of a memory comprising 2LM storage locations representing 2L groups of M distinct partial sums, so as to gradually form, in said storage locations, over a duration of 2L tau 0, M samples to be transmitted; transmitting said samples for transmission.