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

DMT Bit Rate Maximization With Optimal Time Domain Equalizer Filter Bank Architecture

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

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

(2) 700 West Parmer Lane, MD: TX32-PL30, Motorola, Austin, TX 78729 USA
Lucio.Pessoa@motorola.com

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Abstract

In a multicarrier modulation system, a time domain equalizer (TEQ) traditionally shortens the transmission channel impulse response (CIR) to mitigate inter-symbol interference (ISI). In this paper, we propose a data-rate optimal TEQ filter bank whose data rates at the equalizer output are significantly better than those of the Maximum Bit Rate and Minimum ISI methods and similar to those of the least-squares per-tone equalizer method for ADSL CIRs, transmit filters, and receive filters. The contributions of this paper are:

a new model for multicarrier demodulator output SNR that includes ISI, near-end crosstalk, white Gaussian noise, and the digital noise floor;
data rate optimal time domain per-tone TEQ filter bank, and
a new achievable upper bound on achievable bit rate.

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