1. A method for transmission of information data over a communication line, the method comprising the following steps all carried out by a transmitter: (a) obtaining said information data; (b) providing a sequence of subchannel non-overlapped wavelets by using N-points Inverse Fast Fourier Transform (IFFT), each wavelet being constructed as a sum of a predetermined number of functions such that the following conditions are fulfilled: (i) the wavelet is symmetrical and has a finite length, (ii) a spectrum of the wavelet does not include off-band components; (c) modulating said sequence of said subchannel non-overlapped wavelets by said information data; (d) overlapping the modulated subchannel non-overlapped wavelets by shifting every IFFT cycle the data represented by N IFFT points for different modulated prototype wavelets with respect to each other on a predetermined number of IFFT points and summing every IFFT cycle the data signals corresponding to a predetermined number of the shifted modulated prototype wavelets, thereby generating a multicarrier signal carrying said information data; (e) providing every IFFT cycle said multicarrier signal to said communication line for transmitting therethrough.