Research On Network Synchronization Technology Of Wireless Mesh Communication System

As a broadband wireless network structure,Wireless Mesh Communication System has the characteristics of multi-hop,self-organization,self-healing and so on.It is a high-capacity and high-speed distributed network.Wireless Mesh Communication Systems are networking in a wireless and multi-hop way.The network topology is reticular structure,so it has the characteristics of high-reliability,large coverage of network and low deployment cost.In many key technologies of Wireless Mesh Communication System,synchronization technology is responsible for timing synchronization and carrier frequency synchronization,so synchronization technology is crucial to wireless Mesh communication system.Because there is no central base-station in Wireless Mesh Communication System,it is different from the synchronization of traditional network structure.The synchronization of Wireless Mesh Communication System can only be accomplished through the information interaction between nodes,which brings challenges to the implementation of synchronization.In this paper,the distributed synchronization algorithm of Wireless Mesh Communication System is mainly studied under the structure of Wireless Mesh Communication System,and a system design scheme of Wireless Mesh Communication System is given.First of all,this paper analyzes the typical structure and characteristics of Wireless Mesh Communication System,and introduces the difference between synchronization algorithm in Wireless Mesh Communication System and traditional synchronization algorithm.Then two typical classifications of distributed network synchronization algorithm are analyzed.In addition,this paper studies the impact of synchronization performance on Wireless Mesh Communication Systems,and analyzes three typical synchronization algorithms.Secondly,a system scheme of Wireless Mesh Communication System is designed in this paper,and the frame structure design and the new node access process are given successively.This paper proposes the construction of interactive data between nodes and the broadcasting mode.Then,the fading characteristics of wireless channels such as path loss,shadow fading and multi-path fading are introduced,and the link budget is carried out on the basis of the different application scenarios involved in the system scheme.Then,based on the design of the system plan in the third chapter,a distributed synchronization algorithm is proposed.The design scheme of distributed timing synchronization algorithm is given in this paper.It includes the method of selecting reference nodes in the network and the flow of distributed synchronization algorithm.This paper introduces and analyzes three different structures for ZC sequences.The detection algorithms of synchronous signals include the direct correlation detection algorithm,the differential correlation detection algorithm and the M segment correlation detection algorithm,and the three kinds of algorithms are analyzed by simulation.The synchronization signal detection algorithm is different from the noise performance and the frequency offset performance.The simulation results show that the noise performance of the direct correlation detection algorithm is the best.The differential correlation algorithm has the best performance against frequency offset.Finally,the simulation analysis of the proposed distributed synchronization algorithm is given.This paper introduces the design of the receiver's overall scheme,and emphatically introduces and analyzes the frequency offset estimation.At the same time,the simulation analysis of the performance of different frequency offset estimation algorithms is carried out.The simulation shows that the 2 segment correlation frequency offset estimation algorithm is used for the decimal frequency doubling estimation.It has high accuracy,and the 4 segment correlation detection algorithm has a larger range of frequency offset estimation,which can be used for integer frequency offset estimation.This article is under two different scenarios The performance of the proposed distributed timing synchronization algorithm is analyzed by simulation.Simulation results show that the distributed synchronization algorithm proposed in this paper has good synchronization performance.At the same time,the degree of user distribution will affect the performance of the algorithm.The more dense the user is,the better the synchronization performance of the algorithm.