Combined equalization for DMT-based modem receiver

Details Combined equalization for DMT-based modem receiver Combined equalization for DMT-based modem receiver

2006-11-07

2006-11-07

Kim, Kevin (Department: 2611)

Pulse or digital communications

Transceivers

Modems

C375S229000, C375S260000, C455S702000, C455S701000

Reexamination Certificate

active

07133444

ABSTRACT:
A DMT modem (40) is disclosed, in which a combined time domain equalizer and per-tone equalizer is applied to a received DMT signal. The combined equalizer includes a first FFT function (44) that is applied to a set of samples in a time-domain signal after the application of a time domain equalizer (42). The first FFT function (44) produces an initial FFT result, that is accumulated with a sliding FFT (46) performed upon difference values in the time domain samples. The sliding FFT results are applied to a per-ton equalizer (48) which applies a set of complex coefficients determined in training of the modem. A simple 1-tap FEQ (50) then can recover the signal. The combined equalizer enables per-tone equalization, in a manner that is compatible with conventional DSL training standards. According to a second embodiment, the per-tone equalization is performed only on selected tones of the multitone signal.

REFERENCES:
patent: 6219378 (2001-04-01), Wu
“Equalization for DMT-based Broadband Modems”, Pollet et al, IEEE Communications Magazine, May 2000, pp. 106-113.
Van Acker, et al., “Per Tone Equalization for DMT-Based Systems”,IEEE Trans. Comm., vol. 49, No. 1 (Jan. 2001) pp. 109-119.

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