xDSL modem having adaptive compensating filter of null...

Details xDSL modem having adaptive compensating filter of null... xDSL modem having adaptive compensating filter of null...

2007-09-25

2007-09-25

Tran, Khai (Department: 2611)

Pulse or digital communications

Transceivers

Modems

Reexamination Certificate

active

10734997

ABSTRACT:
A xDSL modem having an adaptive compensating filter of null generated by BT (Bridged Tap) minimizes transmission errors. The VDSL having a null compensating filter comprises a null compensator for finding a null frequency generated on a transfer function of a receiving signal before the DFE by predicting and tracing the null frequency to enlarge a signal component of the null frequency. The damage of a signal component resulting from the null generated by BT on a subscriber line is previously compensated before the equalizer. As a result, degradation of transmission speed of xDSL service is prevented and the number of taps in the equalizer is reduced, thereby reducing cost in embodiment of hardware.

REFERENCES:
patent: 2003/0035495 (2003-02-01), Laamanen et al.
patent: 2003/0091111 (2003-05-01), Vaananen

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