Path Loss Measurement of Outdoor Wireless Channel in D-band

Area of Science:

• Wireless Communications
• Electromagnetics
• Radio Propagation

Background:

• The D-band (110-170 GHz) offers large bandwidth but presents complex channel analysis challenges at millimeter-wave (MMW) frequencies.
• Existing research on D-band wireless channels primarily focuses on indoor, short-distance transmissions, with limited investigation into outdoor, long-distance scenarios.

Purpose of the Study:

• To design a D-band outdoor long-distance transmission system.
• To conduct line-of-sight (LOS) propagation measurements in outdoor environments.
• To analyze D-band propagation loss characteristics for distances up to 800 meters.

Main Methods:

• Established Floating Intercept (FI) and Close-In (CI) path loss models using the least squares method.
• Investigated path loss exponent behavior with frequency in both CI and FI models.
• Evaluated D-band path loss against free space conditions in outdoor long-distance scenarios.

Main Results:

• The path loss exponent in the CI model increases with frequency, while the FI model shows no significant frequency dependence.
• D-band path loss in outdoor long-distance environments exceeds free space loss, signifying degraded propagation conditions.
• Both the FI and CI models demonstrated comparable performance in characterizing D-band path loss.

Conclusions:

• The study provides a theoretical model for designing and optimizing high-frequency millimeter-wave propagation measurements beyond 200 meters.
• Selecting a model with fewer parameters is optimal when performance is similar, favoring simpler models for practical application.
• The findings highlight the challenges and characteristics of D-band propagation in outdoor, long-distance settings, informing future system designs.