The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 19, 1999
Filed:
Oct. 31, 1996
Walter Y Chen, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
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.