Abstract
Terahertz (THz) communication is a key candidate for the upcoming age of beyond-fifth-generation mobile networks (B5G) or sixth-generation mobile networks (6G) in the next decade and can achieve ultra-high data rates of dozens of gigabits or even terabits per second. As the carrier frequency increases from radio frequency (RF) to the THz band, the impact of meteorological factors on the wireless link is expected to become more pronounced. In this work, we first provide an overview of the attenuation caused by atmospheric gases, fog, and rain on terrestrial THz wireless communications using the recommendations of the International Telecommunication Union-Radiocommunication (ITU-R). Measured data from the literature are used to predict the attenuation caused by snow. Because unfavorable weather conditions may harm sensitive measurement equipment, ray-tracing (RT) simulations are sometimes used as an alternative to extend sparse empirical data. In this study, the terrestrial channel in an urban scenario at 300 GHz, with a bandwidth of 8 GHz, is characterized using RT simulations under different meteorological factors. The key performance parameters are explored, including path loss (PL), Rician K-factor (KF), root-mean-square (RMS) delay spread (DS), and four angular spreads. The channel characteristics under different meteorological conditions studied in this work are expected to aid the design of future outdoor terrestrial THz communications.
Highlights
In recent years, data traffic has exploded with the accelerated development of multimedia services.Future communication systems need to meet the demands of ultra-high-speed access in various complex environments
In view of the impacts of meteorological factors on terrestrial THz wireless communications, this study considers the International Telecommunication Union-Radiocommunication (ITU-R) prediction methods and representative measurement results for different meteorological factors
We systematically discuss and quantitatively calculate the attenuations caused by various types of meteorological factors, namely atmospheric gases, fog, rain, and snow
Summary
Data traffic has exploded with the accelerated development of multimedia services. We provide an overview of the prediction methods for attenuations caused by different meteorological factors on THz communications, including atmospheric gases, fog, rain, and snow. Since the above-mentioned meteorological factors have considerable influence on the THz wireless channel, we add attenuations caused by atmospheric gases, fog, rain, and snow to each ray simulated in the urban scenario. Based on extensive simulation results, the terrestrial channel in the urban scenario is characterized in terms of PL, shadow fading (SF), Rician K-factor (KF), root-mean-square (RMS) delay spread, and four angular spreads (azimuth angular spread of arrival (ASA), azimuth angular spread of departure (ASD), elevation angular spread of arrival (ESA), and elevation angular spread of departure (ESD)) These parameters are expected to provide the fundamental data for designing.
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