Patent ID: 8693505

Claim:
A method comprising: providing a multicarrier signal formed by a temporal succession of multicarrier symbols comprising: at least one preamble formed by at least three consecutive multicarrier symbols, known as preamble symbols, carrying complex-value data elements each associated with a carrier of said signal, and multicarrier symbols, called data symbols, carrying real-value data elements each associated with a carrier of said signal, and shaping said carriers, implementing: a filtering, by a first prototype filter g[k], of the carriers carrying said complex-value data elements, corresponding to said preamble symbols, enabling said preamble symbols to be shaped, wherein said first prototype filter g[k] takes the following discrete form: g ⁡ [ k ] = F ⁡ ( 0 ) 2 K ⁢ Γ ⁡ ( K + 1 ) Γ ⁡ ( K / 2 + 1 - k · T r ) ⁢ Γ ⁡ ( K / 2 + 1 + k · T r ) with: K=L g −1 with L g being the length of said first prototype filter; F(0) being a constant; Γ(•) being the gamma function; and T r being a temporal resolution parameter; and a filtering, by a second prototype filter, distinct from said first prototype filter, of the carriers carrying said real-value data elements corresponding to said data symbols, enabling said data symbols to be shaped.