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Evangelos N Papasotiriou1, Alexandros-Apostolos A Boulogeorgos2, Katsuyuki Haneda3

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This study models fading in terahertz (THz) wireless systems using experimental data. The generalized Gamma distribution accurately fits THz channel fading, outperforming conventional models for 6G applications.

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Area of Science:

  • Wireless Communications
  • Signal Processing
  • Electromagnetics

Background:

  • The sixth generation (6G) wireless era necessitates ultra-dense deployments and bandwidth-hungry applications.
  • The terahertz (THz) band offers vast contiguous bandwidth crucial for future wireless systems.
  • Accurate stochastic channel models are essential for evaluating 6G wireless system feasibility.

Purpose of the Study:

  • To investigate and accurately model small-scale fading in terahertz (THz) wireless systems.
  • To evaluate the fitting accuracy of various statistical distributions for THz channel fading.
  • To provide fundamental tools for developing theoretical and optimization frameworks for THz wireless networks.

Main Methods:

  • Conducted experimental measurements in diverse indoor environments (shopping mall, airport, university hall).
  • Analyzed fading distributions using three distinct datasets collected over different time periods.
  • Employed Kolmogorov-Smirnov and Kullback-Leibler tests to quantify fitting efficiency.

Main Results:

  • Conventional fading distributions (Rayleigh, Rice, Nakagami-m) showed insufficient fitting accuracy for THz channels.
  • The generalized Gamma distribution demonstrated an almost-excellent fit for the measured THz wireless channel fading.
  • Experimental data validated the superior performance of the generalized Gamma distribution.

Conclusions:

  • The generalized Gamma distribution is a highly suitable model for THz wireless channel fading.
  • Accurate channel modeling is critical for advancing the development of 6G wireless systems.
  • This research provides essential tools for optimizing future THz communication networks.