Table 4.

Comparison of parameters for single frequency CI, FI and multi-frequency ABG path loss models for millimeter wave in indoor environments for NLOS scenarios at different frequencies.

Ref	Frequency (GHz)	Environment	Scenario	Polarization	Distance Range (m)	Model	PLE ($\mathit{\alpha }$)	$\mathit{\beta }$$\left(\mathrm{d}\mathrm{B}\right)$	$\mathit{\sigma }$$\left(\mathrm{d}\mathrm{B}\right)$	$\mathit{\gamma }$
[18, 20]	14	NLOS	Indoor Corridor	V–V	2.00–24.00	CI	2.07	—	5.98	—
						FI	67.27	1.01	3.69	—
[18, 20]	18	NLOS	Indoor Corridor	V–V	2.00–24.00	CI	2.38	—	6.87	—
						FI	71.02	1.17	4.32	—
[18, 20]	22	NLOS	Indoor Corridor	V–V	2.00–24.00	CI	2.26	—	6.86	—
						FI	73.24	1.01	4.07	—
[47]	40	NLOS	Indoor Corridor	V–V	2.00–2.70	CI	2.90	—	9.00	—
[48]	4.5	NLOS	Indoor Office	V–V	1.00–22.70	CI	2.26	—	4.56	—
						FI	16.22	4.85	3.91	—
[48]	4.5	NLOS	Indoor Office	V-Omni	1.00–22.70	CI	3.69	—	2.89	—
						FI	40.48	4.55	2.84	—
[48]	4.5	NLOS	Indoor Office	V–H	1.00–22.70	CI	1.97	—	6.00	—
[48]	28	NLOS	Indoor Office	V–V	1.00–22.70	CI	3.21	—	4.48	—
						FI	50.31	4.13	4.39	—
[48]	28	NLOS	Indoor Office	V-Omni	1.00–22.70	CI	3.85	—	4.85	—
						FI	37.45	5.83	4.50	—
[48]	28	NLOS	Indoor Office	V–H	1.00–22.70	CI	4.65	—	3.57	—
						FI	43.63	6.12	3.31	—
[48]	38	NLOS	Indoor Office	V–V	1.00–22.70	CI	4.38	—	4.14	—
						FI	87.91	2.40	3.73	—
[48]	38	NLOS	Indoor Office	V-Omni	1.00–22.70	CI	4.54	—	2.62	—
						FI	71.06	3.96	2.57	—
[48]	38	NLOS	Indoor Office	V–H	1.00–22.70	CI	5.28	—	4.09	—
						FI	43.63	6.12	3.31	—
						FI	73.24	1.01	4.07	—
[63]	28	NLOS	Indoor Office	V–V	4.1–21.3	CI	2.70	—	9.60	—
						FI	3.50	51.30	9.30	—
[63]	73	NLOS	Indoor Office	V–V	4.1–21.3	CI	3.20	—	11.30	—
						FI	2.70	76.30	11.20	—
[63]	73.5	NLOS	Indoor Office	V–V	4.1–21.3	CI	2.90	—	10.90	—
						ABG	3.10	1.30	10.30	3.80