... Hawaii,USA, April 2007.[10] J. M. Cioffi,S.Jagannathan,W.Lee,etal.,“Greenercopperwith dynamic spectrum management,” AccessNets, Las Vegas,Nev, USA, 2008.[11] S. Jagannathan, C. S. Hwang, and ... precoding, andtherefore, both amplitude and phase of the channels areestimated.This paper describes an estimator for simultaneouslyobtaining the square-magnitude of the FEXT and NEXTchannels of a ... the last sequence, the U lines are available for datatraffic. It should be noted that the crosstalk channels areestimated only for those frequencies that are common for both transmitter m and...