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:
Apr. 17, 2001
Filed:
Dec. 19, 1997
Song Wu, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A method of initializing the operation of a remote modem (,) and central office modem (,) for asymmetric subscriber line modem communications over a twisted pair wire facility (TWP), using discrete multi-tone technology, is disclosed. The initialization process begins with the remote modem (,) issuing an initialization request, in response to which the central office modem (,) issues an acknowledgment. The remote modem (,) includes a low-cost analog filter (,) for separating upstream communication echoes from downstream data. This analog filter (,) increases the duration of impulse response over the channel, and thus requires time-domain equalization (TEQ) process (,) performed by the remote modem (,) to filter relatively long circular prefixes, so that intersymbol interference is eliminated. Transceiver training processes (,R,,C) are carried out, through the generation of a pseudo-random sequence of frames by the central office modem (,), the receipt of which is used by the remote modem (,) to establish its TEQ coefficients and taps in an optimal manner.