Patent ID: 7443917

Claim:
A method for transmission of information data by modulated wavelets over a communication line through a plurality of subchannels, the method comprising the following steps all carried out by a transmitter: (a) obtaining said information data; (b) providing predetermined coefficients representing amplitudes of frequency components of a prototype wavelet; (c) for each sub-channel, generating a signal representing modulated coefficients by multiplying the information data by said amplitudes of frequency components; (d) generating over a time interval T a sequence of L subchannel modulated non-overlapped wavelets by applying an N Inverse Fast Fourier Transform, IFFT, to said signal representing modulated wavelet coefficients; (e) overlapping over the time interval T said sequence of L subchannel modulated non-overlapped wavelets for generating a multi-carrier signal comprising the overlapped wavelets carrying the information data, the overlapping comprising the steps of: (i) starting the overlapping by storing in a shift register zero values; (ii) for each of a plurality of IFFT cycles adding output IFFT data obtained in step (d) that represent the modulated non-overlapped wavelets obtained by N-points IFFT at the current cycle to the shift register for storing therein; (iii) for each of the plurality of IFFT cycles shifting the data stored in the shift register on a number P of points equal to N/L; (iv) providing every IFFT cycle the data from the first P points of the shift register to said communication line for transmitting therethrough and (v) filling the last P points with zeros; (vi) repeating steps (ii) to (v) L times for providing and transmitting the entire overlapped wavelet sequence over the communication line.