Patent ID: 7418035

Claim:
A method for processing a received time domain signal representing a sequence of channel symbols, the method comprising combining a frequency domain representation X MF (f) of the received signal with a frequency domain estimate ISI(f) of intersymbol interference in said representation X MF (f) to generate an ISI-mitigated frequency-domain representation X DFE (f) of said received signal, said estimate ISI(f) being a function of a frequency domain representation {circumflex over (X)} LE (f) of tentative decisions as to the channel symbols, generating final decisions as to the channel symbols as a function of said representation X DFE (f), linear equalizing said frequency domain representation X MF (f) to generate a linear equalized frequency domain representation X LE (f), forming said tentative decisions as a function of said representation X LE (f), generating an estimate of the characteristics of a channel from which said received signal was received, said estimate being generated in response to a frequency domain representation {circumflex over (X)} DFE (f) of said final decisions and a frequency domain representation of said received signal, using said estimate to update parameters used to perform at least one of said linear equalizing and the generating of said intersymbol interference estimate ISI(f), generating an estimate {tilde over (β)} of the in-band noise power β in said received signal, said estimate {tilde over (β)} being generated in response to said frequency domain representation {circumflex over (X)} DFE (f) of said final decisions and a frequency domain representation of said received signal, and using said estimate {tilde over (β)} to update at least one of said parameters used to perform said linear equalizing.