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

Figure 3

Path loss variation with TX-RX separation distance using CI and ABG models. (a) LOS-1 path in tunnel scenario-1, (b) LOS-2 path in tunnel scenario 1, (c) LOS-3 path in tunnel scenario 2, and (d) NLOS path in tunnel scenario 1.

(a)

(b)

(c)

(d)