IEEE Asilomar Conference on Signals, Systems, and Computers, Nov. 3-6, 2002, Pacific Grove, CA USA.

Simultaneous Multichannel Time Domain Equalizer Design Based On The Maximum Composite Shortening SNR

Milos Milosevic (1)(2), Lucio F. C. Pessoa (3), and Brian L. Evans (1)

(1) Embedded Signal Processing Laboratory, Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712-1084 USA
milos@ece.utexas.edu - bevans@ece.utexas.edu

(2) 8021 North FM 620, #1637, Schlumberger, Austin, TX 78726 USA

(3) 7700 West Parmer Lane MD: TX32-PL30, Motorola, Inc., Austin, TX 78729
Lucio.Pessoa@motorola.com

Paper - Poster

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Abstract

A time domain equalizer (TEQ) is a finite impulse response filter that shortens the channel impulse response (CIR) to mitigate inter-symbol interference (ISI). Melsa, Younce, and Rohrs minimized ISI in the time domain by maximizing the shortening signal-to-noise ratio (SSNR) of the energy in a target window to the energy outside the target window in the shortened CIR. Infinite SSNR means zero ISI. Melsa, Younce, and Rohrs also developed a joint channel shortening method to design a single TEQ to shorten a channel and a near-end echo impulse response. In this paper, we extend the joint SSNR method to design a single TEQ to shorten multiple channels by maximizing the composite SSNR. The composite SSNR is a weighted sum of normalized channel SSNRs. The normalized SSNR is the ratio of the energy in the target window samples to the energy of all samples in the shortened CIR and has a range of [0, 1] so that it is better suited for numerical stability and fixed-point implementation. Our proposed method outperforms the joint channel shortening method. because it achieves higher weighted sum of SSNRs of the used channels.

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Last Updated 01/30/03.