Expert system based on wavelets and DELT measurements for VDSL systems

Dual-ended line testing (DELT) is a common capability in most current modems and can be used for digital subscriber line (DSL) qualification and monitoring purposes. In spite of that, this feature remains largely unexplored in the literature. This paper proposes a new method based on wavelets and DELT measurements for estimating the total length of the line under test and identification of bridged-taps, two important line parameters that affect the maximum bit rate reached by a DSL line. The proposed method was tested with measurements employing real twisted-pair cables and obtained reasonably accurate results for the analyzed cases.

[1]  Claudomiro Sales,et al.  Line Topology Identification Using Multiobjective Evolutionary Computation , 2010, IEEE Transactions on Instrumentation and Measurement.

[2]  Tom Bostoen,et al.  Subscriber loop topology classification by means of time-domain reflectometry , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[3]  S. Mallat.  A wavelet tour of signal processing , 1998 .

[4]  Stefano Galli,et al.  Loop makeup identification via single ended testing: beyond mere loop qualification , 2002, IEEE J. Sel. Areas Commun..

[6]  Kenneth J. Kerpez,et al.  Single-ended loop-makeup Identification-part II: improved algorithms and performance results , 2006, IEEE Transactions on Instrumentation and Measurement.

[7]  Thierry Pollet,et al.  Preprocessing of Signals for Single-Ended Subscriber Line Testing , 2006, IEEE Transactions on Instrumentation and Measurement.

[8]  D.E. Dodds,et al.  Single-ended DSL line tester , 2004, Canadian Conference on Electrical and Computer Engineering 2004 (IEEE Cat. No.04CH37513).

[9]  Li Youming,et al.  Low Complexity Hybrid Algorithm for Crosstalk Cancellation , 2010, 2010 International Conference on Communications and Mobile Computing.

[10]  Krista S. Jacobsen,et al.  Fundamentals of DSL Technology , 2005 .

[11]  L. Van Biesen,et al.  On the identification of cables for metallic access networks , 2001, IMTC 2001. Proceedings of the 18th IEEE Instrumentation and Measurement Technology Conference. Rediscovering Measurement in the Age of Informatics (Cat. No.01CH 37188).

[13]  Kenneth J. Kerpez,et al.  Single-ended loop make-up identification-part I: a method of analyzing TDR measurements , 2006, IEEE Transactions on Instrumentation and Measurement.