Understanding digital subscriber line technology
Understanding digital subscriber line technology
Crosstalk identification in xDSL systems
IEEE Journal on Selected Areas in Communications
A frequency-domain approach to crosstalk identification in xDSL systems
IEEE Journal on Selected Areas in Communications
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In this paper we propose a sample algorithm for offline identification and cancellation of crosstalk in xDSL modems using impartial third party concept [2]. The crosstalk identification technique includes the following three procedures: 1) The transmitted and received signals from each DSL modem for a predefined time period are collected and sent to the third party; 2) The signals are resample according to the clock rate of the receiver of interest; 3) The signals timing differences are estimated by cross correlation and crosstalk coupling functions are estimated using the variance comparing method. The practical problems expressed and solution for them are explained, And finally crosstalk signal identified and then removed based on some sample information from each modem and assumption for coefficients in real crosstalk domain. Finally, results are compared with other related studies, and flexibility and power of the algorithm in different conditions are shown. MATLAB 6.5 package is used for programming of the algorithm. The written program is applicable for sample production appropriate with any kind of xDSL modems. Furthermore, the used coefficients for crosstalk are chosen from real measured lab information. Number of investigated samples is adjustable in mentioned time span.