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ThinkMind // International Journal On Advances in Telecommunications, volume 4, numbers 1 and 2, 2011 // View article tele_v4_n12_2011_3


Analytical evaluation of the role of estimation and quantization errors in downstream vectored VDSL systems

Authors:
Marco Baldi
Franco Chiaraluce
Roberto Garello
Marco Polano
Marcello Valentini

Keywords: VDSL; vectoring; channel estimation errors; quantization errors

Abstract:
We investigate the effect of non idealities in the diagonalizing precoder vectoring technique used for cancellation of the far-end crosstalk in downstream VDSL networks. By using analytical formulas, we estimate the average bit rate achievable as a function of both relative and absolute estimation errors. Several numerical examples are provided, in different scenarios and operation conditions. Results are presented covering an important aspect for practical applications: the transmitted power required to achieve a target bit rate, as a function of the line length. Finally, we provide some results on the impact of a smart quantization law, which limits the performance loss.

Pages: 24 to 33

Copyright: Copyright (c) to authors, 2011. Used with permission.

Publication date: September 15, 2011

Published in: journal

ISSN: 1942-2601

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