Fuzzy based Prequalification Methods for EoSHDSL Technology

Abstract

The aim of the study was to create a prequalification system which can prognosticate the available maximal data transmission speed on a copper wire pair over EoSHDSL without installing a real EoSHDS connection. In order to find the relationship between line parameters and bit rates it was necessary to make comparative measurements. The widest spectrum of the line parameters was analyzed, because at the beginning of the work the influence of parameters on the issue could not be determined.
Analyzing the results of the measurements, it clarified that the connection between line parameters and available data rate is not strict. In lots of cases different data rates belonged to similar line parameter values or the same data rate was set by different line parameters. Moreover, the groups of line parameters belonging to the same bit rate were overlapped. To handle this
uncertainty fuzzy systems are most appropriate, so fuzzy logic was chosen for solving the problem. During the work around 140000 measured data were collected. Being in possession of measured results an initiative rule base was set up without using any algorithm. This rule base did not give acceptable results. In order to higher the precision a second rule base was created using bacterial memetic algorithm. The method was tested on real telecommunication networks. All the tests were successful.