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- Wolkerstorfer, Martin, et al.
(författare)
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Low-complexity optimal discrete-rate spectrum balancing in digital subscriber lines
- 2013
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Ingår i: Signal Processing. - Amsterdam : Elsevier. - 0165-1684 .- 1872-7557. ; 93:1, s. 23-34
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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