Full vectoring optimal power allocation in xDSL channels under per-modem power constraints and spectral mask constraints

In xDSL systems, crosstalk can be separated into two categories, namely in-domain crosstalk and out-of-domain crosstalk. Indomain crosstalk is also refered to as self crosstalk. Out-of-domain crosstalk is crosstalk originating from outside the multi-pair system and is also denoted as external noise (alien crosstalk, radio frequency interference,...). While self crosstalk in itself can easily be canceled by a linear detector like the ZF detector, the presence of external noise requires a more advanced processing. Coordination between transmitters and receivers enables the self crosstalk and the external noise to be mitigated using MIMO signal processing, usually by means of a whitening filter and SVD. In this paper, we investigate the problem of finding the optimal power allocation in MIMO xDSL systems in the presence of self crosstalk and external noise. Optimal Tx/Rx structures and power allocation algorithms will be devised under practical limitations from xDSL systems, namely per-mo...

• Type: Journal
• Year: 2010
• Where: CORR
• Authors: Vincent Le Nir, Marc Moonen, Jan Verlinden, Mamoun Guenach
• Keywords: CORR 2010, Crosstalk, Education, External Noise, Out-of-domain Crosstalk