Kumberg Timo, Schindelhauer Christian, Reindl Leonhard
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.
Sensors (Basel). 2017 Jul 26;17(8):1717. doi: 10.3390/s17081717.
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.
唤醒接收器因其超低功耗以及按需提供通信的能力，成为无线传感器网络的自然选择。超低功耗唤醒接收器的一个缺点是，由于载波信号的被动解调，其灵敏度较低。在本文中，我们提出了一种新颖的通信方案，通过有意利用两个或更多无线传感器节点的失谐信号进行干扰，这些信号产生的唤醒信号作为叠加载波的拍频。此外，我们还基于此方法引入了一种通信算法和一种泛洪协议。我们的实验表明，我们的方法可将接收信号强度提高多达3dB，提高了通信的稳健性和可靠性。此外，我们通过户外实验和由多个节点组成的室内设置，证明了我们新开发协议的可行性。泛洪算法在不到20毫秒的时间内实现了几乎100%的唤醒率。
