Method and apparatus for a variable bandwidth multi-protocol X-DSL transceiver

US7315571B1 · kind B1 · utility

Assignee

• Ikanos Communications, Inc. · US

Inventors

• Sam Heidari · Los Altos Hills, US
• Behrooz Rezvani · Pleasanton, US
• Raminder S. Bajwa · Palo Alto, US
• Jacky S. Chow · Mountain View, US
• Avadhani Shridhar · Santa Clara, US
• Dale Smith · San Jose, US
• John Gevargiz · Los Angeles, US
• Saman Behtash · Berkeley, US

Key dates

• Filing date: Apr 18, 2001
• Grant date: Jan 1, 2008
• Expiry date: Jul 18, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M11/062
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

A transceiver for communicating a multi-tone modulated communication channel on a subscriber line. The transceiver includes: a digital signal processor (DSP) with a Fourier transform module and an analog front end (AFE). The DSP determines an available range of frequencies on the subscriber line and expands or contracts the tone spacing of each of a fixed number “N” of tones accordingly by decreasing or increasing the processing interval associated with the Fourier transform of each tone set. The AFE performs digital-to-analog conversion of the multi-tone modulated communication channel at rates compatible with the processing interval of the Fourier transform module; whereby the range of frequencies spanned by the modulated tones on the subscriber line conforms to the available of frequencies on the subscriber line.