Patent ID: 6856649

Claim:
A method for initializing filter coefficients for a hybrid feedback equalizer device for reducing interference of signals transmitted over a communications channel, said hybrid feedback equalizer device implementing frequency domain (FD) filter equalization in a forward path and a time domain (TD) filter equalization in a feedback path, each FD (forward path) and TD (feedback path) filter units having a plurality of adaptable filter taps, said method comprising: a) generating an estimated frequency response transfer function (H) of said channel; b) performing an inverse Fast Fourier Transform (IFFT) on said channel transfer function (H) to result in a time domain profile of said channel; c) limiting energy of each occurrence of post-echoes present said channel to a predetermined value and generating a post-echo profile from said time domain profile; d) obtaining a frequency domain representation (A) of the post-echo profile, and dividing said frequency-domain representation (A) by “estimated frequency response transfer function (H)” to obtain (A)/(H); e) performing an IFFT of (A)/(H) to obtain a time domain representation of the FD equalizer taps and eliminating presence of a predetermined number of taps of said time domain representation of the FD equalizer; and, f) performing a FFT of the resulting time domain representation of FD equalizer to obtain frequency domain representation of FD equalizer taps (G), whereby said obtained taps are used to initialize the forward FD filter of said hybrid equalizer.