A Near-Optimal Linear Crosstalk Canceler for VDSL

Cendrillon, Raphael, Ginis, George, Van den Bogaert, Etienne and Moonen, Marc (2004) A Near-Optimal Linear Crosstalk Canceler for VDSL.

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Title A Near-Optimal Linear Crosstalk Canceler for VDSL
Abstract/Summary Crosstalk is the major source of performance degradation in VDSL. Several crosstalk cancelers have been proposed to address this. Unfortunately they suffer from error propagation, high complexity and long latency. In this paper we present a simple, linear zero forcing (ZF) crosstalk canceler. This design has a low complexity, no latency and does not suffer from error propagation. Furthermore, due to the well conditioned structure of the VDSL channel matrix, the ZF design causes negligible noise enhancement. A lower bound on the performance of the linear ZF canceler is derived. This allows performance to be predicted without explicit knowledge of the crosstalk channels, which simplies service provisioning considerably. This bound shows that the linear ZF canceler operates close to the single user bound. So the linear ZF canceler is a low complexity, low latency design with predictable, near-optimal performance. The combination of spectral optimization and crosstalk cancellation is also considered. Spectra optimization in a multi-access channel generally involves a highly complex optimization problem. Since the linear ZF canceler decouples transmission on each line, the spectrum on each modem can be optimized independently, leading to a signicant reduction in complexity..
Keyword crosstalk cancellation
VDSL
digital subscriber line
spectral optimisation
multi-access channels
Date 2004-12-01
Subjects 291706 Broadband Network Technology
Author Cendrillon, Raphael
Ginis, George
Van den Bogaert, Etienne
Moonen, Marc
Additional Notes Submitted for publication to IEEE Transactions on Signal Processing

 
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Created: Tue, 15 Feb 2005, 10:00:00 EST by Raphael Jean Cendrillon