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dc.contributor.authorMoretti, Marco
dc.contributor.authorPérez Neira, Ana Isabel
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
dc.identifier.citationMoretti, M.; Perez, A. Efficient margin adaptive scheduling for MIMO-OFDMA systems. "IEEE transactions on wireless communications", Gener 2013, vol. 12, núm. 1, p. 278-287.
dc.description.abstractIn this paper we address the problem of margin adaptive scheduling in the downlink of an orthogonal frequency division multiple access (OFDMA) multiple-input multiple-output (MIMO) system. Optimal resource allocation in MIMO systems requires the joint optimization of: a) linear transmit and receive spatial filters, b) channel assignment and c) power allocation. This problem is not convex and its complexity becomes thus intractable already for small sets of users and subcarriers. To reduce the complexity of the problem at hand, we propose a novel heuristic strategy that partitions the users in different groups according to their average channel quality and addresses the original problem by solving a succession of lower-complexity allocation problems. The spatial dimension is employed to prevent multiple access interference from hindering the performance of the sequential allocation. To further reduce the complexity burden we introduce a linear programming formulation in combination with a waterfilling-based strategy to allocate channels and power to the groups of users. Numerical results and evaluation of the computational complexity show that, though suboptimal, in most cases the proposed algorithm manages to exploit in an original way the inherent multi-user diversity of multi-carrier systems to ease the task of resource allocation with a very limited performance loss from the theoretic optimum.
dc.format.extent10 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Comunicacions mòbils
dc.subject.lcshMIMO systems
dc.subject.lcshWireless communication systems
dc.subject.otherAllocation problems
dc.subject.otherChannel allocation
dc.subject.otherChannel Assignment
dc.subject.otherChannel quality
dc.subject.otherHeuristic strategy
dc.subject.otherJoint optimization
dc.subject.otherLinear programming formulation
dc.subject.otherMargin adaptive
dc.subject.otherMulti carrier systems
dc.subject.otherMultiple-input-multiple-output systems
dc.subject.otherMultiuser diversity
dc.subject.otherNumerical results
dc.subject.otherOptimal resource allocation
dc.subject.otherOrthogonal frequency division multiple access
dc.subject.otherPerformance loss
dc.subject.otherPower allocations
dc.subject.otherSpatial dimension
dc.subject.otherSpatial filters
dc.subject.otherMIMO systems
dc.subject.otherMobile telecommunication systems
dc.subject.otherMultiple access interference
dc.subject.otherResource allocation
dc.subject.otherFrequency division multiple access
dc.titleEfficient margin adaptive scheduling for MIMO-OFDMA systems
dc.subject.lemacXarxes locals sense fil Wi-Fi
dc.subject.lemacComunicacions òptiques
dc.contributor.groupUniversitat Politècnica de Catalunya. A&MP - Grup de Processament d'Arrays i Sistemes Multicanal
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (published version)
upcommons.citation.authorMoretti, M.; Perez, A.
upcommons.citation.publicationNameIEEE transactions on wireless communications

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