Título:
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Parameter estimation in wireless sensor networks with faulty transducers: a distributed EM approach
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Autor/a:
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Silva Pereira, Silvana; López Valcarce, Roberto; Pagès Zamora, Alba Maria
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Otros autores:
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Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions |
Abstract:
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We address the problem of distributed estimation of a vector-valued parameter performed by a wireless sensor network in the presence of noisy observations which may be unreliable due to faulty transducers. The proposed distributed estimator is based on the Expectation-Maximization (EM) algorithm and combines consensus and diffusion techniques: a term for information diffusion is gradually turned off, while a term for updated information averaging is turned on so that all nodes in the network approach the same value of the estimate. The proposed method requires only local exchanges of information among network nodes and, in contrast with previous approaches, it does not assume knowledge of the a priori probability of transducer failures or the noise variance. A convergence analysis is provided, showing that the convergent points of the centralized EM iteration are locally asymptotically convergent points of the proposed distributed scheme. Numerical examples show that the distributed algorithm asymptotically attains the performance of the centralized EM method. |
Abstract:
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Peer Reviewed |
Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Processament del senyal -Signal processing -Wireless communication systems -Consensus averaging -Diffusion strategies -Distributed estimation -Expectation-maximization -Maximum-likelihood -Soft detection -Wireless sensor networks. -Tractament del senyal -Comunicació sense fil, Sistemes de |
Derechos:
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Tipo de documento:
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Artículo - Borrador Artículo |
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