Channel Modeling of Wireless Networks in Tunnels

The propagation characteristics of ElectroMagnetic (EM) waves in tunnels are significantly different from those in terrestrial environment. However, the current tunnel channel models cannot provide an analytical solution for both near and far region of the sources. In this paper, the Multimode model is proposed to completely characterize the wireless channel of tunnels in roads/subways as well as underground mines. The new model provides an analytical expression for the path loss and delay spread at any position in a tunnel.