A wavelet-based expert system for digital subscriber line topology identification

作者：Lima V D^*; Klautau A; Costa J; Ericson K; Fertner A; Sales C

来源：International Journal of Communication Systems, 2016, 29(1): 47-63.

DOI：10.1002/dac.2795

• DSL
• line topology identification
• continuous wavelet transform
• expert system
• double-ended line testing
• single-ended line testing

This work proposes a new method for automatically identifying topologies of lines with one or more sections in a telephone network. The method is based on the examination of both impulse response and time-domain reflectometry trace of a line under test. They are analyzed using a method based on the wavelet transform that identifies and extracts features that contain information about the line topology. Those features are interpreted by an expert system composed of three sequential modules that estimate, respectively, the type of line makeup (serial or bridge tap), the lengths of the line sections, and the corresponding cable type, which are the parameters that completely identify the topology according to the assumed model. A thorough comparison with two state-of-the-art methods is also presented using several twisted-pair copper cables. The results show that the proposed method provides good accuracy with respect to topology identification at low computational cost.

• 出版日期2016-1-10