Abstract
The data transmission rate in wireless systems is limited by the transmission delay in the physical channel. In order to improve the data transmission rate of the wireless system in the mine environment, the time delay model of the mine wireless channel was established based on the multi-wave mode method, and the time delay characteristics of the mine wireless channel were simulated. Compared with the measured results, the model can accurately predict the attenuation trend and transmission delay of the signal in the tunnel and further analyze the influence of the tunnel size, carrier frequency, antenna position, and antenna polarization on the delay extension of the wireless channel. Simulation results show that the signal delay is independent of the propagation distance in the far field of the tunnel antenna. The height of the tunnel has a great influence on the delay spread of the horizontally polarized signal, and the width of the tunnel has a great influence on the delay spread of the vertically polarized signal. Frequency changes are not sensitive to delay spread. From the perspective of wireless system deployment and physical layer parameter configuration, by selecting the appropriate antenna polarization and installation location in the tunnel, the delay of wireless communication can be reduced and the transmission rate of the wireless system can be improved.
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