Patent ID: 8494035

Claim:
A circuit for adaptive feedback equalization in the frequency domain comprising: a feedforward filtering section configured to apply filtering on a received block of symbols; a plurality of conversion modules configured to convert blocks of symbols between time domain and frequency domain; a slicer configured to slice a time domain version of a block of equalized symbols and to output a block of sliced symbols; a feedback filtering section configured to apply filtering on a frequency domain version of the block of sliced symbols; a summing module configured to sum the outputs of the feedforward filtering section and the feedback filtering section, thereby yielding the block of equalized symbols; a first updating module configured to update the coefficients of the feedforward filtering section; a second updating module configured to update the coefficients of the feedback filtering section, wherein the first and second updating module being configured to receive a block of frequency domain versions of error signals indicative of the difference between the equalized symbols at the input of the slicer and the block of sliced symbols at the output of the slicer and to compute the coefficient updates using the received block of frequency domain versions of error signals; and a time-domain compensation module configured to receive a time domain converted version of the updated filter coefficients of the feedback filtering section and to receive the block of sliced symbols, thereby generating a feedback error compensation signal, the feedback error compensation signal being added to the block of equalized symbols.