Low-complexity optimal discrete-rate spectrum balancing in digital subscriber lines

Wolkerstorfer, MartinFTW Telecommunications Research Center Vienna, Vienna, Austria (författare)

QC 20121203
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.

Jaldén, Joakim,1976-KTH,Signalbehandling,ACCESS Linnaeus Centre,KTH, Stockholm, Sverige,ACCESS Linnaeus Center, Signal Processing Lab(Swepub:kth)u16uao7t (författare)
Nordström, Tomas,1963-Högskolan i Halmstad,Centrum för forskning om inbyggda system (CERES)(Swepub:hh)tomnor (författare)
FTW Telecommunications Research Center Vienna, Vienna, AustriaSignalbehandling (creator_code:org_t)

Av författaren/redakt...: Wolkerstorfer, M ...; Jaldén, Joakim, ...; Nordström, Tomas ...

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