ADSL Transceivers

Mr. Guner Arslan
Doctoral Candidate
Department of Electrical and Computer Engineering
The University of Texas at Austin

Monday, November 15th, 5:00 PM, ENS 302

arslan@ece.utexas.edu

Abstract

Asymmetric Digital Subscriber Loop (ADSL) technology allows high-speed data access. The downlink data rates vary according to the quality of the line from 1 to 9 Megabits per second. The uplink data rate varies from 384 to 640 kilobits per second. ADSL lines have been available from Southwestern Bell since the Fall of 1997, but ADSL modems have only recently become commercially available for home users.

ADSL is based on discrete-multitone modulation in which multiple digital Quadrature Amplitude Modulation (QAM) signals are combined via an inverse Fourier transform and transmitted as a single signal over an ADSL line. The inverse Fourier transform implements discrete multitone modulation. This talk will cover the fundamentals of ADSL modems, including multicarrier modulation, cyclic prefix, channel shortening, sample synchronization, and symbol synchronization. This talk will also discuss the role of programmable digital signal processor cores in development of a single-chip solution.

A list of Telecommunications and Signal Processing Seminars is available at from the ECE department Web pages under "Seminars". The Web address for the Telecommunications and Signal Processing Seminars is http://anchovy.ece.utexas.edu/seminars