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Summary
This summary is machine-generated.

This study enhances Internet of Things (IoT) device performance using unmanned aerial vehicle (UAV) relays with multiple antennas and non-orthogonal multiple access (NOMA). The proposed system significantly improves reliability and outperforms traditional methods.

Keywords:
AFNOMAUAVergodic capacitymaximum ratio transmissionoutage probability

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Area of Science:

  • Wireless Communication
  • Internet of Things (IoT)
  • Aerial Networks

Background:

  • IoT systems increasingly rely on Unmanned Aerial Vehicles (UAVs) for enhanced connectivity and coverage.
  • Integrating multi-antenna UAVs with Non-Orthogonal Multiple Access (NOMA) offers a promising approach to boost IoT device performance and transmission reliability.

Purpose of the Study:

  • To investigate user clustering and power allocation strategies for multi-antenna UAV-mounted relays in IoT networks.
  • To analyze the impact of antenna selection techniques (Maximum Ratio Transmission and Best Selection) on system performance.
  • To evaluate the performance of the proposed system in practical scenarios with and without direct base station links.

Main Methods:

  • Derivation of closed-form expressions for Outage Probability (OP) and Ergodic Capacity (EC) for IoT devices.
  • Comparative analysis of two multi-antenna UAV scenarios: Maximum Ratio Transmission and Best Selection.
  • Performance evaluation under Nakagami-m fading conditions.
  • Comparison with Orthogonal Multiple Access (OMA) schemes.

Main Results:

  • The number of antennas on UAVs critically impacts system performance.
  • Outage Probability (OP) decreases with increasing Signal-to-Noise Ratio (SNR), antenna count, and fading severity.
  • The proposed NOMA-based UAV relay system demonstrates superior outage performance compared to OMA.
  • Analytical results are validated through Monte Carlo simulations.

Conclusions:

  • Multi-antenna UAV-mounted relays combined with NOMA effectively enhance IoT system reliability and performance.
  • Antenna selection strategies offer a cost-effective way to leverage multi-antenna benefits.
  • The proposed system provides a significant improvement over OMA, particularly in outage performance.