Characterization of radio wave propagation in tunnels for microcellular communications

This work presents model-based characterization of wideband radio wave propagation in straight rectangular tunnel. The propagation characteristics are presented in time and frequency domains for both vertical and horizontal polarizations. Narrowband and wideband received power results are presented. The frequency of occurrence of fast fading depends on the distance between transmitter and receiver. Space-frequency selective fading is discussed along the coherence bandwidth. The envelope cross correlation of signals with spaced frequency is found to be high for large frequency separation. The shape of the power delay profile depends on the distance between the transmitter and the receiver.