Proc. IEEE Int. Conf. on Acoustics, Speech, and Signal Processing, vol. 3, pp. 2573-2576, May 13-17, 2002, Orlando, FL

A Dual-path TEQ Structure For DMT-ADSL Systems

Ming Ding (1), Arthur J. Redfern (2), and Brian L. Evans (1)

(1) 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

(2) Texas Instruments DSP R&D Center, Communication Systems Laboratory, 12500 TI Boulevard, MS 8653, Dallas, TX 75243 USA
redfern@ti.com

Paper - Poster - Matlab Toolbox

Abstract

Discrete Multitone (DMT) modulation is the industry standard for Asymmetrical Digital Subscriber Loop (ADSL) modems. DMT modulation allows for simplified equalization when the effective duration of the channel memory is shorter than the predefined length of the cyclic prefix (CP). A single time-domain equalizer (TEQ) is typically used to truncate the channel memory such that the data rate loss due to the use of the CP is reduced. Because the single TEQ is optimized over all subchannels, it is difficult to find an ideal solution in which the number of bits supported on each subchannel is optimized. This paper proposes a dual-path TEQ, which adds a second TEQ that is biased to selected subchannels to increase transmission throughput. The implementation complexity is lower than other band-partition equalization methods such as per tone equalization.

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Last Updated 01/30/03.