Reverse channel next cancellation for MDSL modem pool
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United States of America Patent
Stats
-
Oct 19, 1999
Issued Date -
N/A
app pub date -
Oct 31, 1996
filing date -
May 9, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
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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