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A prototype low-cost wakeup radio for the 868 MHz band
by Bas Van der Doorn, Winelis Kavelaars, Koen Langendoen
International Journal of Sensor Networks (IJSNET), Vol. 5, No. 1, 2009
Abstract: In many wireless sensor network scenarios, battery-powered nodes must operate for years, which necessitate the need for advanced power management of the radio. In this paper, we pursue the idea of using a second, ultra low-power radio that can be used to trigger a remote interrupt, so that a receiver can fire up its primary radio to engage in efficient high-speed communication with the sender. Wakeup radio avoids the complex bookkeeping associated with energy-efficient MAC protocols, but at the price of additional hardware. We present the first design of a low-cost wakeup radio made out of standard components. Our working prototype implementation operates in the European license-free 868 MHz band, and includes a specialised low-power microcontroller filtering out interference (e.g. GSM signals), which makes it practical for use in many real-world settings.
Online publication date: Wed, 18-Feb-2009
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