Comparison of path loss models for indoor 30 GHz, 140 GHz, and 300 GHz channels

This paper compares performance of the single-frequency floating-intercept (FI) model, the single-frequency close-in (CI) model, the multi-frequency alpha-beta-gamma (ABG) model, and the multi-frequency close-in frequency-dependant (CIF) model at 30 GHz, 140 GHz, and 300 GHz. For comparison purposes, extensive propagation measurements at 30 GHz (26.5–40 GHz), D-band (110–170 GHz), and 300 GHz (300–316 GHz) are conducted in the indoor line-of-sight (LoS) environments. The results show that if no measurement error is present in the channel impulse response, all four models have very similar performance and the model with the smallest number of parameters would be the optimal choice. Furthermore, results show that multi-frequency models have higher stability than single-frequency models. Finally, the results show that in the presence of measurement errors or lack of detailed antenna gain characterization, models without physical anchor (i.e. FI and ABG models) outperform models with physical anchor and correctly predict the reason for path loss mismatch between model and theoretical values.