Large-scale analysis in LoS-NLoS indoor corridor at 18 GHz

Area of Science:

• Electrical Engineering
• Radio Science
• Wireless Communications

Background:

• Indoor wireless communication systems require accurate propagation models for reliable design.
• Corridor environments with junctions present unique challenges for radio wave propagation.
• Existing models may not fully capture the complex effects of geometry and obstructions in such settings.

Purpose of the Study:

• To conduct a large-scale empirical propagation analysis at 18 GHz in an indoor corridor with a 90-degree junction.
• To quantify the path loss differences between line-of-sight (LoS) and non-line-of-sight (NLoS) conditions.
• To evaluate the performance of five path loss models (CI, FI, ABG, DS, 2S-DS) and compare with the 3GPP InH-Office model.

Main Methods:

• Empirical measurement of large-scale radio propagation at 18 GHz.
• Analysis of path loss using five distinct models: Close-In (CI), Floating-Intercept (FI), Alpha-Beta-Gamma (ABG), Dual-Slope (DS), and Two-Slope Dual-Slope (2S-DS).
• Systematic variation of receiver height and transmitter distance to the corridor junction.

Main Results:

• Under LoS, path loss exponent is ~2.29, slightly above free-space decay.
• Under NLoS, a 90-degree corner introduces significant diffraction loss (~41.07 dB), modeled effectively by the 2S-DS approach.
• NLoS path loss is ~43 dB higher than LoS; receiver height and proximity to the corner (up to 8 dB reduction) significantly impact attenuation.

Conclusions:

• The 2S-DS model accurately captures the waveguide-like propagation post-corner and diffraction loss.
• The 3GPP InH-Office model underestimates NLoS attenuation in this specific geometry.
• Accurate indoor wireless design, especially in FR3 environments, necessitates considering geometric interactions, receiver height, and transmitter placement.