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Terahertz channel power and BER performance in rain.
Optics Express
|August 13, 2025
Summary
Rainfall significantly impacts Terahertz (THz) communications, causing power loss but minimal multipath. Adaptive modulation is crucial for reliable 6G networks.
Area of Science:
- Wireless Communications
- Electromagnetics
- Atmospheric Physics
Background:
- Terahertz (THz) communication is key for 6G, offering high data rates.
- Rainfall's effect on THz channels, especially power attenuation and bit error rate (BER), needs further study.
Purpose of the Study:
- Investigate THz channel behavior under rainfall.
- Analyze power attenuation and BER performance in line-of-sight (LoS) conditions.
Main Methods:
- Experimental measurements at 220-230 GHz over 54m.
- Theoretical analysis using ITU-R and Mie scattering models.
- Evaluation of raindrop size distribution impact.
Main Results:
- Significant power attenuation observed due to rain.
- Minimal multipath scattering; high Rician K-factors maintained.
- Raindrop size variations cause power loss fluctuations.
- Quadrature amplitude modulation (QAM) shows better BER performance.
Conclusions:
- Rainfall necessitates adaptive modulation and frequency planning for THz systems.
- Higher frequencies are more sensitive to environmental changes.
- Understanding rainfall dynamics is vital for robust THz network design.
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