Modified Conjugate Gradient Method for ADSL Echo Cancellation

Mr. Takao Inoue
XDSL Technology Advanced Development
Broadband Division
Motorola
Austin, TX

Friday, February 12th, 11:00 AM, ENS 602

ra7682@email.sps.mot.com

Abstract

In recent years, high speed data communications over twisted pair wires has gained tremendous demand. Asymmetric Digital Subscriber Line (ADSL) technology has been adopted by ANSI T1E1.4 (ADSL) committee. Discrete Multitone (DMT) modulation is used in ADSL to optimize the use of available bandwidth over twisted pair wires. A critical component in ADSL system is the echo canceller which is intended to discriminate unwanted echo signals caused by twisted pair interface circuit called hybrid. The amount of echo signal present in the receiver will directly influence ADSL system performance. Hence, high performance echo canceller with fast, efficient, and simple adaptive algorithm is required. General problem of echo cancellation, brief description of ADSL echo canceller, and Modified Conjugate Gradient adaptive algorithm will be discussed.

Biography

Takao Inoue received BS and MS degrees in Electrical Engineering from Oregon State University in 1996 and 1998, respectively. He is currently employed by Motorola Inc., Austin, TX. His main interest is in signal processing techniques for communication systems.

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