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A comprehensive comparison between Terahertz and optical wireless communications.

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This study quantitatively compares Terahertz (THz) communication and optical wireless communication (OWC) for indoor/outdoor use. Findings reveal performance tradeoffs and challenges for THz and OWC deployment, aiding technology selection.

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Area of Science:

  • Wireless communication technologies
  • Optical and Terahertz sensing and systems

Background:

  • Terahertz (THz) communication and optical wireless communication (OWC) are promising for high-bandwidth data transmission.
  • Both technologies face unique challenges in indoor and outdoor deployment scenarios, including signal propagation, alignment, and power consumption.

Purpose of the Study:

  • To quantitatively compare the performance and energy efficiency of THz communication and OWC systems.
  • To analyze the impact of deployment scenarios (indoor/outdoor) and specific challenges like misalignment and power consumption on system performance.

Main Methods:

  • Developed a multi-ray THz channel model with antenna patterns and a Gaussian beam model for VCSEL-based OWC, incorporating misalignment effects.
  • Created power consumption models for THz phase noise, VCSEL nonlinearities, and photodetector tradeoffs.
  • Surveyed stochastic channel models for THz and free-space optics (FSO) links in outdoor scenarios, applying them to UAV-based use cases.

Main Results:

  • Unified beamwidth assumptions enabled consistent evaluation of THz and VCSEL-based OWC systems.
  • Detailed energy efficiency analysis was performed under multi-transmitter coverage for indoor scenarios.
  • Communication robustness was evaluated for THz and FSO links in dynamic outdoor UAV scenarios.

Conclusions:

  • The study provides critical insights into performance tradeoffs and deployment challenges for THz and OWC technologies.
  • Findings aid in understanding the relative advantages of each technology in diverse indoor and outdoor environments.
  • This quantitative comparison supports informed decisions for future wireless communication system design and deployment.