Method and system for transmission of information data over a communication line

A method for reception of information data transmitted by modulated overlapped wavelets over a communication line, the method comprising the following steps all carried out by a receiver:

• (a) receiving a distorted multicarrier signal including a signal representing a sequence of L overlapped subchannel modulated wavelets carrying said information data together with a noise signal provided by said communication line during the transmission;
• (b) separating said overlapped wavelets by shifting the wavelets with respect to each other on a number of samples equal to N/L points of an N-point Fast Fourier Transform (FFT) every T/L time interval, where T is a time duration of one wavelet, thereby providing a sequence of non-overlapped wavelets carrying said information data distorted by a noise signal;
• (c) analyzing said sequence of the non-overlapped wavelets by using the N-points FFT, thereby generating spectral frequency amplitudes of wavelet components of said non-overlapped wavelets;
• (d) demodulating said spectral frequency amplitudes of the wavelet components, thereby to provide the information data.

A transmitter for use with a multicarrier transceiver system for transmission of information data by modulated wavelets over a communication line through a plurality of subchannels, the transmitter comprising:

• (a) a synthesis filter bank configured for obtaining said information data, obtaining predetermined coefficients representing amplitudes of frequency components of a prototype wavelet, and generating a signal representing modulated coefficients, said synthesis filter bank including:
• at least one modulator having at least one multiplier configured for multiplying the information data by said amplitudes of frequency components, thereby modulating said predetermined coefficients by the information data;
• and
• an N-points IFFT unit coupled to the modulator, said N-points IFFT unit being configured for obtaining said signal representing the modulated coefficients, and for each sub-channel generating over a time interval T a sequence of L modulated non-overlapped wavelets modulated by the information data;
• (b) an overlapping unit coupled to said synthesis filter bank, including:
• a parallel adder coupled to N output terminals of the N-points IFFT unit, and a shift register downstream of said parallel adder,
• said overlapping unit being configured for
• (i) starting the overlapping by storing in the 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 unit 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;
• (v) filling the last P points with zeros;
• and
• (vi) repeating steps (ii) to (v) L times for generating a multicarrier signal carrying said information data including the entire overlapped wavelet sequence.

A receiver for use with a multicarrier transceiver system for transmission of information data over a communication line, the receiver comprising:

• (a) a separating unit including:
• (i) a separating shift register configured for obtaining a distorted multicarrier signal comprising a sequence of L overlapped subchannel modulated wavelets carrying said information data together with a noise signal provided by said communication line during the transmission, and
• separating said overlapped wavelets by shifting the wavelets with respect to each other on a number of samples equal to N/L points of an N-point FFT every T/L time interval, where T is a time duration of one wavelet, thereby providing a sequence of the wavelets carrying said information data;
• and
• (ii) a parallel register arranged downstream of said separating shift register and configured for storing the sequence of the wavelets provided by the separating shift register;
• (b) an analyzing filter bank downstream of the separating unit configured for obtaining said sequence of the wavelets and demodulating thereof, thereby to provide said information data, said analyzing filter bank includes:
• (i) an N-points FFT unit configured for obtaining said sequence of the non-overlapped wavelets from the parallel register and generating spectral frequency amplitudes of the wavelet components of said non-overlapped wavelets;
• and
• (ii) a demodulator coupled to said N-points EFT unit and configured for obtaining said spectral frequency amplitudes of the wavelets and generating a signal representing said information data.