IEEE Transactions on Signal Processing, vol. 52, no. 1, pp. 297-301, Jan. 2004.

Infinite Length Results and Design Implications for Time-Domain Equalizers

Rick K. Martin (1), Ming Ding (2), Brian L. Evans (2), and C. Rick Johnson, Jr. (1)

(1) Department of Electrical and Computer Engineering, Rhodes Hall, Cornell University, Ithaca, NY 14853 USA
frodo@ece.cornell.edu - johnson@ece.cornell.edu

(2) Department of Electrical and Computer Engineering, Engineering Science Building, The University of Texas at Austin, Austin, TX 78712-1084 USA
ming@ece.utexas.edu - bevans@ece.utexas.edu

Draft of Paper

ADSL Research at Cornell - ADSL Research at UT Austin

Abstract

We show that maximum shortening SNR TEQs are often nearly symmetric. Constraining the TEQ to be symmetric causes only a 3% loss in bit rate. Symmetric TEQs have greatly reduced design and implementation complexity. We also show that for infinite length TEQs, minimum mean squared error target impulse responses have all zeros on the unit circle, which can lead to poor bit rate performance.

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Last Updated 03/10/06.