Blind Crosstalk Channel Identification in DMTBased DSL Systems
This paper describes a blind crosstalk channel identification method and its application to Discrete MultiTone (DMT)-based Digital Subscriber Line (DSL) systems. Cyclostationarity inherited in these systems is exploited to isolate effects of different sources, which allows separate selection and identification of crosstalk channels. Second-order statistics-based source separation is performed by controlling part of the cyclicextension in the transmitted DMT block. The minimum changes required by this method facilitate its implementation in current DSL systems. All mentioned theoretical derivations are illustrated by numerical results obtained with measured DSL channels.