Defining upstream power backoff for VDSL

Very high-speed digital subscriber line (VDSL) upstream data transmission in a distributed environment will suffer from relatively strong far-end crosstalk generated by the shorter lines in the binder. This effect can dramatically reduce the upstream capacity on longer lines. To secure the capacity...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2002-06, Vol.20 (5), p.1064-1074
Main Author: Schelstraete, S.
Format: Article
Language:English
Subjects:
Binders
Crosstalk
Data communication
Data transmission
Digital
Distributed power generation
DSL
Frequency
High speed
On-line systems
Optimization
Power system modeling
Radiofrequency interference
Standardization
Topology
Upstream
Working environment noise
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Summary:Very high-speed digital subscriber line (VDSL) upstream data transmission in a distributed environment will suffer from relatively strong far-end crosstalk generated by the shorter lines in the binder. This effect can dramatically reduce the upstream capacity on longer lines. To secure the capacity on lines of all lengths, shorter lines will be required to systematically reduce their transmit power. This power reduction is known as (upstream) power backoff (PBO or UPBO). This paper reviews the problem and summarizes a number of PBO techniques and results that may not be readily available in the published literature. Next, a general formulation is presented in terms of a "reference PSD" and a method is proposed to determine the optimal value of the reference PSD. This paper is mainly based on work that was done in VDSL standardization. It is an extended version of work that was previously published.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2002.1007387