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Sensors 2017, 17(8), 1717;

Exploiting Concurrent Wake-Up Transmissions Using Beat Frequencies

Department of Microsystems Engineering – IMTEK, Laboratory for Electrical Instrumentation, University of Freiburg, Georges-Koehler-Allee 106, 79110 Freiburg, Germany
Department of Computer Science – IIF, Computer Networks and Telematics, University of Freiburg, Georges-Koehler-Allee 51, 79110 Freiburg, Germany
Author to whom correspondence should be addressed.
Received: 20 April 2017 / Revised: 12 July 2017 / Accepted: 18 July 2017 / Published: 26 July 2017
(This article belongs to the Section Sensor Networks)
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Wake-up receivers are the natural choice for wireless sensor networks because of their ultra-low power consumption and their ability to provide communications on demand. A downside of ultra-low power wake-up receivers is their low sensitivity caused by the passive demodulation of the carrier signal. In this article, we present a novel communication scheme by exploiting purposefully-interfering out-of-tune signals of two or more wireless sensor nodes, which produce the wake-up signal as the beat frequency of superposed carriers. Additionally, we introduce a communication algorithm and a flooding protocol based on this approach. Our experiments show that our approach increases the received signal strength up to 3 dB, improving communication robustness and reliability. Furthermore, we demonstrate the feasibility of our newly-developed protocols by means of an outdoor experiment and an indoor setup consisting of several nodes. The flooding algorithm achieves almost a 100% wake-up rate in less than 20 ms. View Full-Text
Keywords: wireless sensor network; wake-up receiver; concurrent transmissions; constructive interference; wake-up flooding; protocol; beat frequency; MAC protocol wireless sensor network; wake-up receiver; concurrent transmissions; constructive interference; wake-up flooding; protocol; beat frequency; MAC protocol

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kumberg, T.; Schindelhauer, C.; Reindl, L. Exploiting Concurrent Wake-Up Transmissions Using Beat Frequencies. Sensors 2017, 17, 1717.

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