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

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

2010-06-07

arxiv.org/abs/1006.1210v1

IEEE Transactions on Communications, Vol. 57, No. 1, pp. 194-202, January 2009

Computer Science

Information Theory

8 pages, 6 figures

Scientific paper

In xDSL systems, crosstalk can be separated into two categories, namely in-domain crosstalk and out-of-domain crosstalk. In-domain 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-modem total power constraints and/or spectral mask constraints, leading to a generalized SVD-based transmission. Simulation results are given for bonded VDSL2 systems with external noise coming from ADSL2+ or VDSL2 disturbing lines, along with a comparison between algorithms with one-sided signal coordination either only at the transmit side or the receive side.

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