Wireless Channel Model of UWB for Underground Tunnels in Coal Mine

In this paper, the radio propagation of ultra wide band (UWB) in coal mine tunnels is analyzed according to channel path loss. The transmitted pulse and modulated method of UWB system are selected in allusion to its propagation characteristic. We present the method of improving time-variant finite impulse responding filter model to a trapped delay line channel model with specific center frequency and multipath resolution. The Improvement for a typical UWB pulse has been done, and the statistic characteristics of the modified channel model have been analyzed. The simulation results show that the multipath delay characteristics of the improved channel model well match the measured results of coal mine tunnels.