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Duality-gap bounds for multi-carrier systems and their application to periodic scheduling
FTW, Österrike.
FTW, Österrike.
FTW, Österrike.ORCID-id: 0000-0002-0562-2082
2010 (engelsk)Inngår i: 2010 IEEE International Conference on Communications: ICC 2010 : 23-27 May 2010, Capetown, South Africa, Piscataway, N.J.: IEEE Press, 2010Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

We investigate a novel cross-layer optimization problem for jointly performing dynamic spectrum management (DSM) and periodic rate-scheduling in time. The large number of carriers used in digital subscriber lines (DSL) makes DSM a large-scale optimization problem for which dual optimization is a commonly used method. The duality-gap which potentially accompanies the dual optimization for non-convex problems is typically assumed to be small enough to be neglected. Also, previous theoretical results show a vanishing duality-gap as the number of subcarriers approaches infinity. We will bound the potential performance improvements that can be achieved by the additional rate-scheduling procedure. This bound is found to depend on the duality-gap in the physical layer DSM problem. Furthermore, we will derive bounds on the duality-gap of the two most important optimization problems in DSL, namely the maximization of the weighted sum-rate and the minimization of the weighted sum-power. These bounds are derived for a finite number of subcarriers and are also applicable to the respective problems in orthogonal frequency division multiplex (OFDM) systems. ©2010 IEEE.

sted, utgiver, år, opplag, sider
Piscataway, N.J.: IEEE Press, 2010.
Serie
IEEE International Conference on Communications, ISSN 1550-3607
Emneord [en]
Cross layer optimization, Derive bounds, Digital subscriber lines, Dynamic spectrum management, Finite number, Large-scale optimization, Multi carrier systems, Nonconvex problem, Optimization problems, Orthogonal frequency division multiplex, Performance improvements, Periodic scheduling, Physical layers, Sub-carriers, Theoretical result, Weighted Sum, Weighted sum-rate
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Identifikatorer
URN: urn:nbn:se:hh:diva-21177DOI: 10.1109/ICC.2010.5501818ISI: 000290335601028Scopus ID: 2-s2.0-77955350098ISBN: 978-142446404-3 OAI: oai:DiVA.org:hh-21177DiVA, id: diva2:588890
Konferanse
IEEE International Conference on Communications (ICC), Cape Town, South Africa, May 23-27, 2010
Tilgjengelig fra: 2013-01-16 Laget: 2013-01-16 Sist oppdatert: 2013-02-26bibliografisk kontrollert

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