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Sensors 2017, 17(9), 1961; https://doi.org/10.3390/s17091961

Wake-Up Receiver with Equal-Gain Antenna Diversity

Laboratory for Electrical Instrumentation, Department of Microsystems Engineering–IMTEK, University of Freiburg, Georges-Koehler-Allee 106, 79110 Freiburg, Germany
This paper is an extended version of our paper published in T. Kumberg, R. Tannhaeuser, and L. M. Reindl. “Using antenna diversity to improve wake-up range and probability.” Session 4P6 RF and Wireless Communication 2091.
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Received: 26 July 2017 / Revised: 21 August 2017 / Accepted: 23 August 2017 / Published: 25 August 2017
(This article belongs to the Section Sensor Networks)
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Abstract

Small scale fading signals resulting from multipath propagation can cause signal strength variations in the range of several dB. Resulting from the fluctuating signal strengths, the wake-up packet reception rate can decrease significantly. Using antenna diversity can greatly mitigate these effects. This article presents a novel wireless sensor node with wake-up receiver that uses an equal-gain diversity method with two antennas in the wake-up path. Summation of the two diversity branch signals is done after the passive demodulation of the incoming signals. As a result, the wireless sensor node requires almost no additional active parts that would increase power consumption. Furthermore, we demonstrate experimentally the improved wake-up robustness and reliability achieved by this diversity technique in a multipath environment. View Full-Text
Keywords: wake-up receiver; wireless sensor node; small-scale fading; antenna diversity; wake-up packet; wireless sensor network wake-up receiver; wireless sensor node; small-scale fading; antenna diversity; wake-up packet; wireless sensor network
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Kumberg, T.; Tannhaeuser, R.; Reindl, L.M. Wake-Up Receiver with Equal-Gain Antenna Diversity. Sensors 2017, 17, 1961.

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