Author(s):
Moraes, R.; Dortschy, B.; Klautau, A.; Riu, J.R.i.
Communications, 2008. ICC '08. IEEE International Conference on 19-23 May 2008 Page(s):1420 - 1425
Digital Object Identifier 10.1109/ICC.2008.275
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Semi-Blind Power Allocation for Digital Subscriber Lines (pdf)
Abstract:
Digital subscriber lines (DSL) are today one of the most important means for delivering high-speed data transmission. An emerging technique for dealing with one of the technology’s most harmful problems, crosstalk, is dynamic spectrum management (DSM). DSM literature already counts with some half a dozen important solutions. These solutions can be classified according to four different aspects: optimality, computational cost, distribution and required crosstalk channel information. In this work we present an algorithm, named semiblind spectrum balancing, which achieves a compelling trade-off between these four aspects. The scheme is based on the idea of optimization against a virtual line, a fictitious line to represent the damage caused to other users in the network. This line is adjusted with the aid of limited message-passing between modems and a central agent and very simple crosstalk channel information. Crosstalk channel knowledge required should be much simpler to obtain than full channel estimation.
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