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Multiple Access Channel Optimal Spectrum Balancing for Upstream DSL Transmission

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4 Author(s)
Tsiaflakis, P. ; Katholieke Univ. Leuven, Heverlee ; Vangorp, J. ; Verlinden, J. ; Moonen, M.

Upstream DSL transmission suffers from in-domain crosstalk as well as out-of-domain or alien crosstalk. Here, the use of multi-user receiver signal coordination e.g. generalized decision feedback equalization, can lead to spectacular performance gains. This paper presents a transmission scheme, referred to as MAC-OSB, which focuses on the weighted rate sum capacity by joint receiver signal coordination and transmit spectrum coordination. The proposed scheme incorporates per-user total power constraints, spectral mask constraints and discrete bit or power loading constraints. Furthermore a low-complexity scheme, referred to as MAC-ISB, is presented which performs similar to MAC-OSB. Simulations show large performance gains over existing methods especially for scenarios with significant alien crosstalk

Published in:

Communications Letters, IEEE  (Volume:11 ,  Issue: 4 )

Date of Publication:

April 2007

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