Prototype signals construction for multicarrier transmission

Method for the transmission of a digital signal, especially in a non-stationary transmission channel, characterized in that it comprises the following steps:

• the channel encoding of a digital signal to be transmitted, delivering real digital coefficients am,n chosen out of a predetermined alphabet;
• the building of a signal s(t) meeting the following equation:
• s(t)=Σam,nxm,n(t) m+n even
• where:
• m is an integer representing the frequency dimension;
• n is an integer representing the temporal dimension;
• t represents time;
• xm,n(t) is a basic function translated into the time-frequency space of one and the same even-parity prototype function x(t) taking real or complex values, namely:
• xm,n(t)=eiφm,nei(2πmυ0τ+φ)x(t−nτ0) with υ0τ0=1/2
• where φ is an arbitrary phase parameter,
• said basic functions {xm,n} being mutually orthogonal, the real part of the scalar product of two different basic functions being zero,
• the transmission of a signal, having said signal s(t) as its complex envelope, to at least one receiver.