Design Of Mine Wireless Communication System And SDR Realization Based On SC-FDE

In some limited areas,such as tunnels,semi-buried highways,underground parking lots,mines,etc.,with the development of wireless communication,the introduction of wireless communication solutions gradually reflects its development prospects.This paper mainly focuses on the research of the mine environment with limited space,proposes the scheme of using SC-FDE technology for mine wireless communication,studies the timing synchronization and frequency offset estimation algorithm.In addition,on the basis of simulation to verify its feasibility,the software radio platform is used for system-level implementation.This paper first introduces the fading characteristics of mine wireless channels,analyzes the various statistical parameters of the fading signal,and uses the Nakagami distribution to establish the impulse response model of the mine wireless channel according to the variability of the amplitude statistical characteristics.In addition,according to the transmission characteristics of electromagnetic waves in coal mines,the operating frequency band and system parameters of the system are determined,and the channel models of two typical underground communication scenarios are established using the tapped delay line model,which lays the foundation for the development of subsequent chapters.Then,starting from the requirements of the mine's wireless channel for the communication scheme,a nonlinear power amplifier model in the transmitter is established to simulate the environment with limited transmission power in the mine tunnel.The SC-FDE and OFDM systems are compared in terms of system principle,peak-to-average ratio,channel capacity and error performance,and the advantages of SC-FDE system for mine wireless communication are pointed out.Subsequently,in view of the synchronization problem in the SC-FDE communication scheme,several common synchronization algorithms and their advantages and disadvantages are introduced first,and then the characteristics of the ZC sequence and the influence of the frequency offset on its correlation are analyzed.In order to resist the influence of frequency offset and noise in the mine channel,a timing synchronization algorithm based on the improved ZC sequence is proposed based on the cross-correlation synchronization algorithm.At the same time,a frequency synchronization algorithm based on the phase difference of two iterations to compensate frequency offset is given.And on the basis of the mine channel model established in this paper,the proposed algorithm is simulated and analyzed,and the simulation results provide theoretical support for the hardware implementation in the following paper.Finally,this paper combines SC-FDE with MIMO technology,gives a MIMO SC-FDE system design suitable for mine channels,and analyzes several key links in the system.Then it briefly introduces the software and hardware architecture of the Y320 equipment used in this system implementation,and combines the system model to configure the initial parameters of the Y320,and uses the Matlab R2019 a software to implement the system-level receiving and sending process.In addition,it can be seen from the timing synchronization results of this system,the received signal constellation diagram and the overall system error performance that the mine SC-FDE wireless communication scheme designed in this paper still has good performance in real channels.