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
KERPEZ KENNETH J
Application Number:
PCT/US2004/015297
Publication Date:
January 20, 2005
Filing Date:
May 14, 2004
Export Citation:
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:
See also references of EP 1623239A4
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