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- W68800318 abstract "Sensor networks provide virtual snapshots of the physical world via distributed wireless nodes that can sense in different modalities, such as acoustic and seismic. Classiffication of objects moving through the sensor field is an important application that requires collaborative signal processing (CSP) between nodes. Given the limited resources of nodes, a key constraint is to exchange the least amount of information between them to achieve desired performance. Two main forms of CSP are possible. Data fusion — exchange of low dimensional feature vectors — is needed between correlated nodes, in general, for optimal performance. Decision fusion — exchange of likelihood values — is sufficient between independent nodes. Decision fusion is generally preferable due to its lower communication and computational burden. We study CSP of multiple node measurements for classification, each measurement modeled as a Gaussian (target) signal vector corrupted by additive white Gaussian noise. The measurements are partitioned into groups. The signal components within each group are perfectly correlated whereas they vary independently between groups. Three classiffiers are compared: the optimal maximum-likelihood classiffier, a data-averaging classiffier that treats all measurements as correlated, and a decision-fusion classiffier that treats them all as independent. Analytical and numerical results based on real data are provided to compare the performance of the three CSP classiffiers. Our results indicate that the sub-optimal decision fusion classiffier, that is most attractive in the context of sensor networks, is also a robust choice from a decision-theoretic viewpoint." @default.
- W68800318 created "2016-06-24" @default.
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- W68800318 date "2003-01-01" @default.
- W68800318 modified "2023-09-30" @default.
- W68800318 title "Collaborative Signal Processing for Distributed Classification in Sensor Networks" @default.
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- W68800318 doi "https://doi.org/10.1007/3-540-36978-3_13" @default.
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