NDLI: How Dense Should a Sensor Network Be for Detection With Correlated Observations?

Content Provider	IEEE Xplore Digital Library
Author	Chamberland, J.-F. Veeravalli, V.V.
Copyright Year	1963
Abstract	A detection problem in sensor networks is considered, where the sensor nodes are placed on a line and receive partial information about their environment. The nodes transmit a summary of their observations over a noisy communication channel to a fusion center for the purpose of detection. The observations at the sensors are samples of a spatial stochastic process, which is one of two possible signals corrupted by Gaussian noise. Two cases are considered: one where the signal is deterministic under each hypothesis, and the other where the signal is a correlated Gaussian process under each hypothesis. The nodes are assumed to be subject to a power density constraint, i.e., the power per unit distance is fixed, so that the power per node decreases linearly with the node density. Under these constraints, the central question that is addressed is: how dense should the sensor array be, i.e., is it better to use a few high-cost, high-power nodes or to have many low-cost, low-power nodes? An answer to this question is obtained by resorting to an asymptotic analysis where the number of nodes is large. In this asymptotic regime, the Gaumlrtner-Ellis theorem and similar large-deviation theory results are used to study the impact of node density on system performance. For the deterministic signal case, it is shown that performance improves monotonically with sensor density. For the stochastic signal case, a finite sensor density is shown to be optimal
Sponsorship	IEEE Information Theory Society
Starting Page	5099
Ending Page	5106
Page Count	8
File Size	328729
File Format	PDF
ISSN	00189448
Volume Number	52
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sensor systems Wireless sensor networks Sensor fusion Signal processing Sensor arrays Communication channels Stochastic processes Working environment noise Gaussian noise Gaussian processes wireless sensors Decentralized detection decision-making distributed detection multisensor systems sensor network
Content Type	Text
Resource Type	Article
Subject	Library and Information Sciences Information Systems Computer Science Applications

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