Patent ID: 7609611

Claim:
A method for modulating a biorthogonal frequency division multiplex/offset modulation (BFDM/OM) biorthogonal multicarrier signal, wherein a bank of synthesis filters are implemented, having 2M parallel branches, wherein M is an integer parameter and M≧2, each branch of synthesis filters being fed by source data and each comprising an expander of order M and a synthesis filter, which is derived from a predetermined prototype modulation function, said method performing the following steps: a multiplication by ⅇ j ⁢ π 2 ⁢ n of each of said source data, providing multiplied source data; applying a predetermined phase shift to each source data of a set of 2M multiplied source data, wherein said predetermined phase shift is D=αM−β, with α an integer representing a reconstruction delay and β an integer between 0 and M−1, implementing a reverse Fourier transform fed by the set of 2M source data having undergone the predetermined phase shift, feeding 2M synthesis filters with outputs of said reverse Fourier transform, expansion of order M of outputs of said synthesis filters, providing synthesis filter outputs, grouping said synthesis filter outputs, and transmitting the grouped synthesis filter outputs.