Signal Optimization Of Wireless Communication System In Underground Mine Engineering

Due to the harsh environment of the mine roadway,the beam of the roadway communication antenna is relatively wide affected by the roadway itself and various mechanical equipment,the receiving end antenna receives electromagnetic waves that have passed through multiple transmission paths such as refraction,direct radiation,and reflection,making the receiving end serious interference between codes,The bit error rate is high,leading to multipath fading,frequency selective fading,and serious inter-symbol interference in the mine.In order to improve the wireless transmission environment of underground mines,this article applies the multiple input multiple output orthogonal frequency division multiplexing technology to the mine wireless communication system.The relevant research contents of this article are as follows:First of all,based on the classical electromagnetic wave propagation theory,according to Maxwell’s equations,Marc Terry approximation analysis method,multi-mode transmission theory and waveguide theory equations,the propagation characteristics of electromagnetic waves in ideal empty and vertical underground tunnels are studied.Using Matlab for simulation,through the comparative analysis of several different cross-section roadways,the electromagnetic wave in the frequency range of 1.0 GHz is selected as the best carrier frequency in the mine roadway.Secondly,through Matlab simulation,it is proved that the channel capacity of the mine MIMO system is proportional to the number of transceiver antennas.Once again,the focus is on analyzing the fading characteristics of the mine’s wireless communication environment,constructing a multi-input multi-output channel model based on spatial correlation,and analyzing the model’s channel capacity and optimal antenna selection.Through Matlab simulation,it can be concluded that the channel capacity of the mine wireless communication system can be maximized within a safe and reliable range without increasing the channel space correlation of the mine multiple input multiple output system.The established mine has multiple inputs and multiple outputs.The optimal configuration of the output system is four sending and four receiving.Finally,based on the MIMO system model established above,the relevant channel coding technology is used to reduce the bit error rate of the mine MIMO system.