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A Compact Low-Power LoRa IoT Sensor Node with Extended Dynamic Range for Channel Measurements.

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This study introduces a low-power wireless sensor node for LoRaWAN channel characterization. It offers a significantly wider dynamic range for accurate link performance analysis in sub-GHz IoT networks.

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Area of Science:

  • Wireless Communication
  • Internet of Things (IoT)

Background:

  • Sub-GHz wireless technologies like LoRa and SigFox are crucial for long-range, low-data-rate IoT sensor networks.
  • Existing performance studies often lack a high dynamic range for comprehensive channel measurement.
  • There is a need for advanced tools to characterize LoRaWAN performance.

Purpose of the Study:

  • To present an autonomous, low-power, LoRa-compatible wireless sensor node.
  • To enable detailed LoRa channel characterization and link performance analysis.
  • To overcome the dynamic range limitations of current commercial LoRa modules.

Main Methods:

  • Development of a custom wireless sensor node with LoRa compatibility.
  • Integration of stepped attenuators controlled by a dynamic attenuation adjustment algorithm.
  • Calibration of the node for precise received signal power (dBm) measurements.

Main Results:

  • The developed node achieves a significantly larger dynamic range compared to commercial LoRa modules.
  • Accurate measurements of received signal power are obtainable.
  • The hardware design and verification measurements are presented.

Conclusions:

  • The presented wireless sensor node is suitable for LoRa channel characterization and link performance analysis.
  • It offers enhanced capabilities for studying sub-GHz IoT networks.
  • Opens up various LoRa-related research applications and opportunities.