Optimizing power normalization for G.fast linear precoder by linear programming

The use of vectoring for crosstalk cancellation in the new ITU-T G.fast standard for next generation DSL systems becomes essential for efficient utilization of the extended bandwidth (up to 200 MHz). In VDSL2 (up to 30 MHz), a zero-forcing-based linear precoder is used in downstream which approaches...

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Bibliographic Details
Published in:2014 IEEE International Conference on Communications (ICC) pp. 4160 - 4165
Main Authors: Muller, Francisco C. B. F., Chenguang Lu, Eriksson, Per-Erik, Host, Stefan, Klautau, Aldebaro
Format: Conference Proceeding
Language:English
Published: IEEE 01.06.2014
Subjects:
Bit rate
Communication cables
Crosstalk
Optimization
Quadrature amplitude modulation
Signal to noise ratio
Vectors
ISSN:1550-3607
Online Access:Get full text
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Summary:The use of vectoring for crosstalk cancellation in the new ITU-T G.fast standard for next generation DSL systems becomes essential for efficient utilization of the extended bandwidth (up to 200 MHz). In VDSL2 (up to 30 MHz), a zero-forcing-based linear precoder is used in downstream which approaches single-line performance. However, at high frequencies, the linear precoder may amplify the signal power substantially since the crosstalk channel is much stronger than at lower frequencies. Performance could be significantly degraded by power normalization to keep the PSD below the mask. In this work, we extended a per-line power normalization scheme by linear programming (LP) optimization. By simulations using measured cable data it is shown how the LP-based scheme further improves the linear precoder and it is also capable of balancing the data rate between lines. Further, the simulations also show the non-linear Tomlinson-Harashima precoder performs better than the linear precoders.
ISSN:1550-3607
DOI:10.1109/ICC.2014.6883973