Pulse or digital communications – Transceivers – Modems
Patent
1996-10-31
1999-10-19
Ghebretinsae, Temesghen
Pulse or digital communications
Transceivers
Modems
375346, 379417, 370201, H04B 136
Patent
active
059700882
ABSTRACT:
A central office xDSL modem pool has N logical xDSL modems. Each modem consists of a transmitter part and a receiver part and is connected to a twisted pair subscriber loop. A central office clock synchronizes the modem transmitters. A reverse channel near-end crosstalk (NEXT) canceller bank is implemented within the modem pool. The NEXT canceller bank has N NEXT cancellers corresponding to the N MDSL modems. Each canceller has N adaptive filters of size M. Outputs of all N adaptive filters are combined to form the NEXT cancellation signal for the corresponding modem. Each adaptive filter is adapted according to the error signal between the received signal and the NEXT cancellation signal and the corresponding transmit signal as the correlation vector.
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Donaldson Richard L.
Franz Warren L.
Ghebretinsae Temesghen
McClure C. Alan
Texas Instruments Incorporated
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