FEATURE EXTRACTION OF ONE PORT SCATTERING PARAMETERS FOR SINGLE ENDED LINE TESTING |
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| Carine Neus, Patrick Boets, Leo Van Biesen |
- Abstract:
- In order to identify if a subscriber loop is suitable for DSL service, the transfer function of the loop has to be estimated. Several measurement techniques exist, however Single Ended Line Testing is gaining much attention lately. This method allows only measuring at the central office side and yields a reflectogram. One of the critical issues in the estimation of the transfer function from this data is the correct extraction of the features of the reflectogram. This paper presents a new feature extraction algorithm for a previously reported transfer function estimator. It starts by explaining the previously reported algorithm. Its main drawbacks are modelling errors and loss of information due to the iterative approach. The paper explains how the new algorithm tackles these problems. The new method strongly relies of the first and second derivatives of the reflectogram, which is a completely new approach. Finally, the efficiency of both algorithms is compared. The improvements are both in terms of accuracy and identification time.
- Keywords:
- Digital Subscriber Line (DSL), Single Ended Line Testing (SELT), loop qualification, feature extraction, transfer function estimation
- Download:
- PWC-2006-TC4-009u.pdf
- DOI:
- -
- Event details
- Event name:
- XVIII IMEKO World Congress
- Title:
Metrology for a Sustainable Development
- Place:
- Rio de Janeiro, BRAZIL
- Time:
- 17 September 2006 - 22 September 2006