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 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.

[1]  Krista S. Jacobsen,et al.  Use of the reference noise method bounds the performance loss due to upstream power backoff , 2002, IEEE J. Sel. Areas Commun..

[2]  Giovanni Cherubini.  Optimum upstream power back-off and multiuser detection for VDSL , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[3]  M. Friese,et al.  Power back-off strategies for very high bit rate digital subscriber line transmission systems , 1999, Seamless Interconnection for Universal Services. Global Telecommunications Conference. GLOBECOM'99. (Cat. No.99CH37042).

[4]  Walter Y. Chen,et al.  DSL: Simulation Techniques and Standards Development for Digital Subscriber Lines , 1998 .

[5]  Sigurd Schelstraete.  Upstream power back-off in VDSL , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[6]  K. S. Jacobsen.  Methods of upstream power backoff on very high speed digital subscriber lines , 2001 .

[7]  A. Wang,et al.  Effect of bridged taps on channel capacity at VDSL frequencies , 1999, 1999 IEEE International Conference on Communications (Cat. No. 99CH36311).

[8]  Wei Yu,et al.  An adaptive multiuser power control algorithm for VDSL , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[9]  John M. Cioffi,et al.  Very-high-speed digital subscriber lines , 1999, IEEE Commun. Mag..