Dsl transmission system with echo-cancellation

摘要

The invention relates to a digital subscriber line transmission system comprising an inverse fast Fourier transform (IFFT) circuit (14) receiving N digital outgoing values as frequency domain coefficients; a fast Fourier transform (FFT) circuit (18) receiving a time domain signal and providing N digital frequency domain coefficients as incoming values; a line interface (16) coupling the IFFT and the FFT circuits to a subscriber line (10); and a circuit (26) for inserting a cyclic suffix (CS) at the end of each symbol, wherein a symbol is a portion of the time domain signal corresponding to N outgoing values. The system comprises an echo-canceller arranged for subtracting from each incoming value the respective outgoing value multiplied by a respective constant scaling factor (k). <IMAGE>