An experimentally validated fading model for THz wireless systems

Paper

Abstract

As the wireless world moves towards the sixth generation (6G) era, the demand of supporting bandwidth-hungry applications in ultra-dense deployments becomes more and more imperative. Driven by this requirement, both the research and development communities have turned their attention into the terahertz (THz) band, where more than [Formula: see text] of contiguous bandwidth can be exploited. As a result, novel wireless system and network architectures have been reported promising excellence in terms of reliability, massive connectivity, and data-rates. To assess their feasibility and efficiency, it is necessary to develop stochastic channel models that account for the small-scale fading. However, to the best of our knowledge, only initial steps have been so far performed. Motivated by this, this contribution is devoted to take a new look to fading in THz wireless systems, based on three sets of experimental measurements. In more detail, measurements, which have been conducted in a shopping mall, an airport check-in area, and an entrance hall of a university towards different time periods, are used to accurately model the fading distribution. Interestingly, our analysis shows that conventional distributions, such as Rayleigh, Rice, and Nakagami-m, lack fitting accuracy, whereas, the more general, yet tractable, [Formula: see text]-[Formula: see text] distribution has an almost-excellent fit. In order to quantify their fitting efficiency, we used two well-defined and widely-accepted tests, namely the Kolmogorov-Smirnov and the Kullback-Leibler tests. By accurately modeling the THz wireless channel, this work creates the fundamental tools of developing the theoretical and optimization frameworks for such systems and networks.

Analysis

Paper intelligence

Summary

This paper proposes and validates a new fading model for Terahertz (THz) wireless systems based on experimental measurements, showing that the generalized Gamma distribution provides a significantly better fit than conventional models.

Key findings

Conventional fading distributions (Rayleigh, Rice, Nakagami-m) are inadequate for THz systems.
The generalized Gamma distribution ([Formula: see text]-[Formula: see text]) offers an almost-excellent fit for THz fading.
Experimental measurements were conducted in diverse real-world environments (shopping mall, airport, university hall).
Kolmogorov-Smirnov and Kullback-Leibler tests confirm the fitting efficiency of the proposed model.

Methods

Experimental measurements in a shopping mall, airport check-in area, and university entrance hall.
Statistical analysis of measurement data to determine fading distributions.
Comparison of fitting accuracy using Kolmogorov-Smirnov and Kullback-Leibler tests.
Validation of the generalized Gamma distribution for THz channel modeling.

Limitations

The study focuses on specific indoor environments.
Further validation may be needed for different THz system configurations and outdoor scenarios.

Applications

Development of 6G wireless systems.
Design of reliable and high-data-rate THz communication networks.
Optimization of wireless system and network architectures for THz bands.

Confidence100%

Discovery

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Source record

Publication metadata

Authors: Evangelos N. Papasotiriou; Alexandros–Apostolos A. Boulogeorgos; Katsuyuki Haneda; Mar Francis De Guzman; Angeliki Alexiou
Published: Sep 21, 2021
Journal or venue: Scientific Reports
DOI: 10.1038/s41598-021-98065-x
Paper type: journal article
Source: Openalex

DOI OpenAlex