Abstract
With the introduction of Internet of Things (IoT) technology in several sectors, wireless, reliable, and energy-saving communication in distributed sensor networks are more important than ever. Thereby, wake-up technologies are becoming increasingly important as they significantly contribute to reducing the energy consumption of wireless sensor nodes. In an indoor environment, the use of wireless sensors, in general, is more challenging due to signal fading and reflections and needs, therefore, to be critically investigated. This paper discusses the performance analysis of wake-up receiver (WuRx) architectures based on two low frequency (LF) amplifier approaches with regard to sensitivity, power consumption, and package error rate (PER). Factors that affect systems were compared and analyzed by analytical modeling, simulation results, and experimental studies with both architectures. The developed WuRx operates in the 868 MHz band using on-off-keying (OOK) signals while supporting address detection to wake up only the targeted network node. By using an indoor setup, the signal strength and PER of received signal strength indicator (RSSI) in different rooms and distances were determined to build a wireless sensor network. The results show a wake-up packets (WuPts) detection probability of about 90% for an interior distance of up to 34 m.
Highlights
IntroductionWireless sensor networks (WSNs) have gained more and more interest in the recent period due to their importance in the Internet of Things (IoT) area, including wide applications, e.g., Industry
Wireless sensor networks (WSNs) have gained more and more interest in the recent period due to their importance in the Internet of Things (IoT) area, including wide applications, e.g., Industry4.0, smart buildings, smart environment [1], precision farming [2], and health care [3]
WuRx and asynchronous communication offer significant energy savings for wireless sensor networks compared to synchronized communication protocols
Summary
Wireless sensor networks (WSNs) have gained more and more interest in the recent period due to their importance in the IoT area, including wide applications, e.g., Industry. The transmitter uses a preamble with an integrated address to communicate with the receiver according to an asynchronous schedule, where the reception readiness is confirmed with an acknowledgment. The so-called WuRx is connected to the sensor node, and the main microcontroller unit (MCU) (Figure 1) remains in the power-saving sleep mode. The performance and reliability of sensor nodes with integrated wake-up receivers based on commercial of the shelf (COTS) components are investigated in an indoor environment.
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