Sensor selection strategies for state estimation in energy constrained wireless sensor networks |
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Authors: | Yilin Mo Roberto Ambrosino Bruno Sinopoli[Author vitae] |
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Affiliation: | aDepartment of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA, USA;bDipartimento per le Tecnologie, Università degli Studi di Napoli Parthenope, Centro Direzionale, Isola C4, 80143, Napoli, Italy |
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Abstract: | Wireless Sensor Networks (WSNs) enable a wealth of new applications where remote estimation is essential. Individual sensors simultaneously sense a dynamic process and transmit measured information over a shared channel to a central base station. The base station computes an estimate of the process state by means of a Kalman filter. In this paper we assume that, at each time step, only a subset of all sensors are selected to send their observations to the fusion center due to channel capacity constraints or limited energy budget. We propose a multi-step sensor selection strategy to schedule sensors to transmit for the next T steps of time with the goal of minimizing an objective function related to the Kalman filter error covariance matrix. This formulation, in a relaxed convex form, defines an unified framework to solve a large class of optimization problems over energy constrained WSNs. We offer some numerical examples to further illustrate the efficiency of the algorithm. |
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Keywords: | Estimation problem Convex optimization Wireless sensor networks |
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