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NVIS Multicarrier Modulations for Remote-Sensor Applications.

Josep M Maso1, Tomas Gonzalez1, Jordi Male1

  • 1La Salle Campus, Ramon Llull University, 08022 Barcelona, Spain.

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|November 4, 2020
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Summary

This study explores using Orthogonal Frequency-Division Multiplexing (OFDM) for robust High-Frequency (HF) communications in Near-Vertical Incidence Skywave (NVIS) channels. OFDM offers improved reliability for remote sensor networks compared to standard HF modulations.

Keywords:
HFIoTMIL-STD 188 110 DNVISOFDMRemote SensingSTANAGUSN

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Area of Science:

  • Electrical Engineering
  • Telecommunications
  • Wireless Communication

Background:

  • The proliferation of Internet of Things (IoT) devices and remote sensors necessitates robust communication solutions.
  • Satellites are a viable option for Ubiquitous Sensor Networks (USN), but coverage can be a drawback in remote areas.
  • Existing High-Frequency (HF) standards are not optimized for the unique challenges of Near-Vertical Incidence Skywave (NVIS) communication.

Purpose of the Study:

  • To investigate the suitability of Orthogonal Frequency-Division Multiplexing (OFDM) for NVIS HF communication.
  • To enhance the robustness and reliability of USN data transmission in remote locations.
  • To compare the performance of OFDM against standard HF modulations in NVIS channels.

Main Methods:

  • Implementation and testing of a low-cost platform utilizing NVIS HF channels.
  • Development and application of a novel OFDM modulation scheme tailored for NVIS.
  • Comparative analysis of standard HF modulations and the designed OFDM modulation.
  • Experimental testing between Barcelona and Tarragona with varying transmission power and modulation orders.

Main Results:

  • The designed OFDM modulation demonstrated superior robustness in NVIS HF channels compared to standard HF modulations.
  • OFDM proved less dependent on the specific NVIS channel conditions, offering more consistent performance.
  • The low-power platform achieved a coverage area of up to 250 km for USN.

Conclusions:

  • OFDM is a promising modulation technique for enhancing the reliability of USN communications over NVIS HF channels.
  • The developed OFDM approach offers a cost-effective and robust solution for remote sensor networks.
  • Further research can explore optimizing OFDM parameters for even greater NVIS communication efficiency.