Channel Measurements and Modeling at 6 GHz in the Tunnel Environments for 5G Wireless Systems

Table 2

Parameters in the ABG, CI, and CI-opt path loss models in tunnel scenarios in terms of LOS and NLOS paths at 6 GHz. Dis. Ran. denotes distance range. Number of data points denotes the number of data points.

Sce.	Env.		Number of data points	Dis. Ran. (m)	ABG				CI		CI-opt
						(dB)		(dB)		(dB)	(m)		(dB)
Tunnel 1	LOS-1	Mea.	20	21	1.74	33.32	2	2.59	1.72	1.56	0.75	1.75	1.39
		Sim.	191	21	1.69	31.54	2	2.36	1.66	3.00	0.98	1.61	2.10
	LOS-2	Mea.	12	13	2.12	31.64	2	2.35	1.69	0.53	1.23	1.45	0.38
		Sim.	111	13	2.02	31.11	2	8.27	1.50	2.80	0.97	1.55	0.51
	NLOS	Mea.	32	33	2.58	32.19	2	7.68	2.18	4.32	3.95	2.41	1.38
		Sim.	308	33	2.57	29.42	2	7.41	2.20	7.50	2.86	2.11	2.74
Tunnel 2	LOS-3	Mea.	17	18	2.33	30.99	2	1.06	1.58	1.56	1.51	1.45	1.39
		Sim.	80	18	2.32	31.40	2	6.52	1.74	3.00	1.03	1.71	2.10