Affiliation:
1. Department of Electronic and Software Engineering, Kyungnam University, Changwon 51767, Republic of Korea
2. Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
3. Department of Electronic Engineering, Soonchunhyang University, Asan 31538, Republic of Korea
Abstract
Rain attenuation based on the drop size distribution (DSD) with different rainfall rates (R) at low THz frequencies is investigated in this paper. The rain attenuation is calculated using the DSD measured for one year and the extinction cross-section (ECS) by the Mie scattering theory. Moreover, the obtained specific rain attenuation is verified by the empirical model using the measurement system consisting of a transmitter, a receiver, and weather measurement units. We measured the received power against the uniform transmitted power at 240, 270, and 300 GHz on the rooftop of the National Radio Research Agency (RRA) in Korea during the same period as the DSD measurement period. After curve fitting by regression analysis, we compared both rain attenuations obtained in two methods with the recommendation International Telecommunication Union Radiocommunication Sector (ITU-R) P.838-3. The root mean square errors (RMSEs) of the DSD model are 2.8977, 2.8646, and 2.8331 at 240, 270, and 300 GHz, respectively. The calculated result using the Mie scattering and the measured DSD methods shows the best fit to the data of the ITU-R recommendation for a rainfall rate of up to 5 mm/h. On the other hand, the empirical results using the T/Rx antenna system are slightly higher compared to the data of the ITU-R recommendation. As the rainfall rate increases, the difference between our results and ITU-R recommendation increases. This study will be useful for predicting rain attenuation for terrestrial wireless links operating at low THz frequencies.
Funder
Institute for Information & Communications Technology Planning & Evaluation
Subject
Electrical and Electronic Engineering,Computer Networks and Communications,Hardware and Architecture,Signal Processing,Control and Systems Engineering
Reference29 articles.
1. Samad, M.A., Diba, F.D., and Choi, D.Y. (2021). A survey of rain attenuation prediction models for terrestrial links-current research challenges and state-of-the-art. Sensors, 21.
2. Electromagnetic waves attenuation due to rain: A prediction model for terrestrial or LOS SHF and EHF radio communication links;Moupfouma;J. Infrared Millim. Terahertz Waves,2009
3. Modification of distance factor in rain attenuation prediction for short-range millimeter-wave links;Budalal;IEEE Antennas Wirel. Propag. Lett.,2020
4. Dynamic rain attenuation model for millimeter wave network analysis;Peric;IEEE Trans. Wirel. Commun.,2017
5. A two-component rain model for the prediction of attenuation statistics;Crane;Radio Sci.,1982