METHOD AND SYSTEM FOR IMPROVED SINGLE-ENDED LOOP MAKE-UP IDENTIFICATION

Title:

METHOD AND SYSTEM FOR IMPROVED SINGLE-ENDED LOOP MAKE-UP IDENTIFICATION

Document Type and Number:

WIPO Patent Application WO2004104531

Kind Code:

A3

Abstract:

In a method and system for determining the composition of a subscriber loop, the method consists of analyzing the echo responses generated by the transmittal of pulses onto the subscriber loop. In the method, discontinuities along a loop are identified sequentially by comparing the measured waveform to waveforms generated on the basis of a hypothesized topology. The best match for the waveform is identified using a maximum likelihood approach and a maximum a-posteriori probability (MAP) estimator using observed knowledge regarding the loop plant. A multiple path search is also utilized to improve results and reduce computation time. Once the generated waveform that best matched the measured data had been found and a discontinuity identified, the waveform generated is subtracted from the measured data to produce a compensated waveform, which is used to detect the location and cause of the next echo. A calibration method is implemented to further improve data acquisition.

Inventors:

GALLI STEFANO
KERPEZ KENNETH J

Application Number:

PCT/US2004/015297

Publication Date:

January 20, 2005

Filing Date:

May 14, 2004

Export Citation:

Click for automatic bibliography generation Help

Assignee:

TELCORDIA TECH INC (US)

International Classes:

G01R13/00; G01R31/11; H04B3/32; H04B3/46; H04L12/26; H04M3/30; H04M3/22; G01H; (IPC1-7): G01R13/00

Foreign References:

US20030016770A1	2003-01-23
US6744854B2	2004-06-01
US6668041B2	2003-12-23

Other References: