Channel Equalization for Wireline Systems

Ms. Biao Lu
The University of Texas at Austin

Wednesday, October 25th, 10:00 AM, ENS 602

blu@ece.utexas.edu

Abstract

Communication involves implicitly the transmission of information from one point to another through a series of processes. The three basic elements in each communication system are the transmitter, channel, and receiver. The transmitter and receiver are separated in space. A channel is the physical medium that connects the transmitter and receiver and distorts the transmitted signals in different ways. Severe distortions occur when data transmits through wireline channels. One way to counteract channel distortion in the transmission band is to employ an equalizer in the receiver.

In this talk, I will focus on channel equalization in discrete multitone systems. Channel equalizers, a.k.a, {\it time-domain equalizers} (TEQ) are used to shorten the effective channel impulse response to a desired length. Since the existence of poles causes channels of the carrier-serving-area (CSA) digital subscriber line (DSL) to have long tails, I develop the new matrix pencil methods to estimate pole locations. Then, setting zeros of a TEQ at the locations of estimated poles can be one way to design a TEQ with or without the knowledge of input training sequence. I also design divide-and-conquer TEQs which have lower computational cost than the current methods and give the comparable performance in terms of shortening signal-to-noise ratio.

Biography

Biao Lu graduated from high school in 1987 from Beijing No. 10 School in Beijing, P. R. China. She received the degree of Bachelor of Engineering in Biomedical Engineering from Capital Institute of Medicine in July 1992 in Beijing, P. R. China, and Master of Science in Electrical Engineering from The University of Texas at Austin, in December 1997. From July 1992 to January 1995, she was a research assistant and teaching assistant in the department of biomedical engineering in Peking Union Medical College in Beijing, P. R. China. She will receive her PhD EE degree in the area of Telecommunications and Information Systems Engineering, Department of Electrical \& Computer Engineering, The University of Texas at Austin, Austin, TX USA in December of 2000.

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://signal.ece.utexas.edu/seminars