Partial crosstalk precompensation in downstream VDSL

Authors:
Raphael Cendrillon;George Ginis;Marc Moonen;Katleen Van Acker
Affiliations:
Katholieke Universiteit Leuven, Kasteelpark Arenberg 10, Heverlee 3001, Belgium;Texas Instruments, 2043 Samaritan Drive, San Jose, CA;Katholieke Universiteit Leuven, Kasteelpark Arenberg 10, Heverlee 3001, Belgium;Alcatel Bell, Francis Wellesplein 1, Antwerp 2018, Belgium
Venue:
Signal Processing - Signal processing in communications
Year:
2004

Citing 4
Cited 4

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Distributed multiuser power control for digital subscriber lines

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Joint spectrum management and constrained partial crosstalk cancellation in a multi-user xDSL environment

Signal Processing
Computationally efficient partial crosstalk cancellation in fast time-varying DSL crosstalk environments

EURASIP Journal on Applied Signal Processing
An efficient low-complexity joint multi-user power control and partial crosstalk cancellation in xDSL systems

IMACS'08 Proceedings of the 7th WSEAS International Conference on Instrumentation, Measurement, Circuits and Systems
Convergence analysis of downstream VDSL adaptive multichannel partial FEXT cancellation

IEEE Transactions on Communications

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Abstract

Very high bit-rate digital subscriber line (VDSL) is the latest generation in the ongoing evolution of DSL standards. VDSL aims at bringing truly broadband access, greater than 52 Mbps in the downstream, to the mass consumer market. This is achieved by transmitting in frequencies up to 12 MHz. Operating at such high frequencies gives rise to crosstalk between the DSL systems in a binder, limiting achievable data-rates. Crosstalk is typically 10-15 dB larger than other noise sources and is the primary limitation on performance in VDSL. In downstream transmission several crosstalk precompensation schemes have been proposed to address this issue. Whilst these schemes lead to large performance gains, they also have extremely high complexities, beyond the scope of current implementation.In this paper we develop the concept of partial crosstalk precompensation. The majority of the crosstalk experienced in a DSL system comes from only a few other lines within the binder. Furthermore its effects are limited to a small subset of tones. Partial precompensation exploits this by limiting precompensation to the tones and lines where it gives maximum benefit. As a result, these schemes achieve the majority of the gains of full crosstalk precompensation at a fraction of the run-time complexity. In this paper we develop several partial precompensation schemes. We show that with only 20% of the run-time complexity of full precompensation it is possible to achieve 80% of the performance gains.