Publications:Low-Complexity OptimalDiscrete-Rate Spectrum Balancing in Digital Subscriber Lines

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Title Low-Complexity OptimalDiscrete-Rate Spectrum Balancing in Digital Subscriber Lines
Author Martin Wolkerstorfer and Joakim Jaldén and Tomas Nordström
Year 2013
PublicationType Journal Paper
Journal Signal Processing
HostPublication
DOI http://dx.doi.org/10.1016/j.sigpro.2012.06.007
Conference
Diva url http://hh.diva-portal.org/smash/record.jsf?searchId=1&pid=diva2:550315
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.