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dc.contributor.authorSilva Pereira, Silvana
dc.contributor.authorLópez Valcarce, Roberto
dc.contributor.authorPagès Zamora, Alba Maria
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
dc.identifier.citationSilva, S., López, R., Pages, A. A diffusion-based em algorithm for distributed estimation in unreliable sensor networks. "IEEE signal processing letters", Gener 2013, vol. 20, núm. 6, p. 595-598.
dc.description.abstractWe address the problem of distributed estimation of a parameter from a set of noisy observations collected by a sensor network, assuming that some sensors may be subject to data failures and report only noise. In such scenario, simple schemes such as the Best Linear Unbiased Estimator result in an error floor in moderate and high signal-to-noise ratio (SNR), whereas previously proposed methods based on hard decisions on data failure events degrade as the SNR decreases. Aiming at optimal performance within the whole range of SNRs, we adopt a Maximum Likelihood framework based on the Expectation-Maximization (EM) algorithm. The statistical model and the iterative nature of the EM method allow for a diffusion-based distributed implementation, whereby the information propagation is embedded in the iterative update of the parameters. Numerical examples show that the proposed algorithm practically attains the Cramer–Rao Lower Bound at all SNR values and compares favorably with other approaches.
dc.format.extent4 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria electrònica::Instrumentació i mesura::Sensors i actuadors
dc.subject.lcshSensor networks
dc.subject.otherConsensus averaging
dc.subject.otherDiffusion strategies
dc.subject.otherDistributed estimation
dc.subject.otherSensor networks
dc.subject.otherSoft detection
dc.titleA diffusion-based em algorithm for distributed estimation in unreliable sensor networks
dc.subject.lemacXarxes de sensors
dc.contributor.groupUniversitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (published version)
upcommons.citation.authorSilva, S., López, R., Pages, A.
upcommons.citation.publicationNameIEEE signal processing letters

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