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Non-Orthogonal Multiple Access for Ubiquitous Wireless Sensor Networks.

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  • 1Department of Electrical and Electronic Engineering, Auckland University of Technology, Auckland 1010, New Zealand. asim.anwar@aut.ac.nz.

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Summary
This summary is machine-generated.

This study introduces power-domain non-orthogonal multiple access (NOMA) for ubiquitous wireless sensor networks (UWSNs) to improve spectrum efficiency. NOMA enhances average link throughput and energy efficiency compared to orthogonal multiple access (OMA) in interference-limited unlicensed spectrum.

Keywords:
cross-technology interferencenon-orthogonal multiple accessstochastic geometryubiquitous wireless sensor networksunlicensed spectrum

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Area of Science:

  • Wireless Communication
  • Network Engineering
  • Signal Processing

Background:

  • Ubiquitous wireless sensor networks (UWSNs) are crucial for smart cities but face spectrum limitations.
  • Existing UWSNs often operate in unlicensed spectrum, leading to significant cross-technology interference.
  • 5th Generation (5G) cellular networks utilize power-domain non-orthogonal multiple access (NOMA) to enhance spectral efficiency.

Purpose of the Study:

  • To investigate the application of power-domain NOMA in UWSNs for the first time.
  • To analyze the performance of NOMA in UWSNs operating in unlicensed, interference-limited environments.
  • To compare NOMA's efficiency against conventional orthogonal multiple access (OMA) in UWSNs.

Main Methods:

  • Modeling sensor interferences using stochastic geometry.
  • Deriving a closed-form expression for outage probability in a downlink scenario.
  • Performing diversity analysis for ordered NOMA users.
  • Evaluating average link throughput and energy consumption efficiency.

Main Results:

  • A novel closed-form expression for outage probability under interference is derived.
  • NOMA demonstrates superior average link throughput compared to OMA in UWSNs.
  • NOMA exhibits enhanced energy consumption efficiency over OMA in UWSNs.
  • Computational complexity for NOMA users is analyzed.

Conclusions:

  • Power-domain NOMA is a viable technique to enhance spectrum utilization in UWSNs.
  • NOMA offers significant performance gains in terms of throughput and energy efficiency in unlicensed spectrum.
  • The findings provide valuable insights for designing efficient UWSN communication systems.