NDLI: Optimal transmit spectra for communication in the presence of crosstalk and imperfect echo cancellation

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Optimal transmit spectra for communication in the presence of crosstalk and imperfect echo cancellation

Content Provider	IEEE Xplore Digital Library
Author	Ahmed, N. Baraniuk, R.G. Shaver, D.P.
Copyright Year	2001
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Rice Univ., Houston, TX, USA (Ahmed, N.)
Abstract	In many communication systems, including Digital Subscriber Lines, performance is severely limited by crosstalk interference. Previous work has presented a general framework for designing optimal transmit spectra for crosstalk avoidance. The technique uses the channel, noise, and interference characteristics to setup and solve an optimization problem which maximizes the capacity of neighboring lines, while maintaining spectral compatibility with other services. This joint signaling and optimal power distribution technique yields significant performance gains over conventional fixed spectra in terms of bit-rates and performance margins. In general, the spectra that result from this scheme have both an echo cancelled and frequency division multiplexed region. To ease the analysis, this technique assumed that the echo canceller has perfect echo rejection capability, which in practice is not true. In this paper, we propose an extension to these techniques, in which we factor the performance of practical echo cancellers into the optimization procedure. When echo rejection is not perfect, as is generally the case, our technique shows significant performance gains over previous techniques. As the performance of the echo canceller increases, our technique converges to the same solution.
Starting Page	17
Ending Page	21
File Size	455052
Page Count	5
File Format	PDF
ISBN	0780371615
DOI	10.1109/ETS.2001.979412
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-09-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Echo cancellers Power cables Crosstalk Signal processing algorithms Interference Performance gain Telephony Frequency DSL Copper
Content Type	Text
Resource Type	Article

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