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This paper introduces and analyzes an Event-Driven Field-Estimation (EDFE) protocol for wireless sensor networks. In the authors' field estimation scheme the sensors derive their own notion of expected reading. Readings differing from the expected are considered events of interest and trigger a data transmission to the sink. The proposed protocol allows sensor nodes to only transmit the events of interest, suppressing the transmission of less important data and, as a consequence, saving energy. The EDFE protocol allows the sink to synchronize the received data and correctly reconstruct the sampled process.
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