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Low-complexity optimal discrete-rate spectrum balancing in digital subscriber lines
FTW Telecommunications Research Center Vienna.
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0001-6630-243X
Centre for Research on Embedded Systems (CERES), Halmstad University.
2013 (English)In: Signal Processing, ISSN 0165-1684, E-ISSN 1872-7557, Vol. 93, no 1, 23-34 p.Article in journal (Refereed) Published
Abstract [en]

Discrete-rate spectrum balancing in interference-limited multi-user and multi-carrier digital subscriber lines (DSL) is a large-scale, non-convex and combinatorial problem. Previously proposed algorithms for its (dual) optimal solution are only applicable for networks with few users, while the suboptimality of less complex bit-loading algorithms has not been adequately studied so far. We deploy constrained optimization techniques as well as problem-specific branch-and-bound and search-space reduction methods, which for the first time give a low-complexity guarantee of optimality in certain multi-user DSL networks of practical size. Simulation results precisely quantify the suboptimality of multi-user bit-loading schemes in a thousand ADSL2 scenarios under measured channel data.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 93, no 1, 23-34 p.
Keyword [en]
Power control, DSL, Interference channel, Combinatorial search
National Category
URN: urn:nbn:se:kth:diva-104773DOI: 10.1016/j.sigpro.2012.06.007ISI: 000309849400003ScopusID: 2-s2.0-84866370403OAI: diva2:567338

QC 20121203

Available from: 2012-11-12 Created: 2012-11-12 Last updated: 2012-12-03Bibliographically approved

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Jaldén, Joakim
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