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Sensor Signal Processing for Autonomous Wireless Sensors
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DOI：10.1109/IMTC.2008.4547225.png)
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Wireless Sensor Networks are nowadays a reality However, a wireless node must be a truly autonomous system, i.e. it must embed its own power source, generally a battery pack For this reason, it is of main concern to limit every source of wasted power. In particular, nodes exploit low duty-cycle strategies to increase their life, spending most of their time in low power mode, turning off all devices within the system except a wakeup oscillator. However, in this way some time must be spent waiting for circuitries settling time, especially if a high accuracy measurement is required In this paper an efficient implementation of a filtering algorithm that is able to reduce this time is discussed It is based on a hybrid combination of median and mean filter, joining advantages of both linear and non-linear filtering. A well tailored implementation has been experimentally tested and discussed.
Keyword:
wireless sensor
low-power
sensor signal processing
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