Research On Synchronization Technology Of Private Network Communication System Based On MESH Architecture

As a new broadband wireless access network,MESH network has attracted more and more attention from scholars and research institutions.The characteristics of MESH network include self-organization,selfhealing,high bandwidth and so on.Synchronization technology mainly includes symbol timing synchronization,carrier synchronization and sampling clock synchronization.Not only is the synchronization technology crucial to MESH network,but it is the foundation of efficient network communication.The synchronization scheme of MESH network can be divided into two types: synchronization and distributed synchronization based on master node selection.The synchronization scheme based on the selection of the master node in MESH network is mainly studied.Four aspects are discussed: the redesign of MESH frame structure,the design of master node selection scheme,the design of the synchronization scheme based on the master node selection,and the synchronization performance analysis of the MESH network system.Firstly,the basic structure and characteristics of MESH network are introduced.And the main application scenarios of MESH are analyzed.In addition,the MESH synchronization technology based on OFDM is summarized.Moreover,the typical OFDM based synchronization algorithm is analyzed.Secondly,two kinds of frame structure for MESH network(the maximum support of 16 users and 10users)are designed,and the initialization process of the user node,including the user entry and exit network,the time slot allocation,are analyzed.Besides,the wireless link budget is discussed and calculated on the basis of the wireless channel modeling.Then,the design of timing synchronization scheme based on master node selection in MESH network is studied.This paper proposes three different master node selection schemes:the maximum mean power scheme(MMP),the betweenness centrality scheme(BC)and the Correlation peak detection scheme(CPD).In different scenarios,the synchronization performance of the master-slave network based on the master node and the candidate node is simulated and compared,and the rationality and scientificity of the two master node selection schemes are verified.In addition,this paper analyzes the timing synchronization algorithm of the repetitive structure training sequence,and proposes a solution to the peak platform of its timing measure function.Then,the timing synchronization algorithm based on the conjugate symmetric training sequence is analyzed.The timing synchronization algorithm is carried out when the decimal frequency offset and the integer doubling deviation are analyzed.In contrast,the timing synchronization scheme based on ZC sequence is described.The effects of different inter-correlation algorithms,including direct correlation,difference correlation and M-part correlation,on timing synchronization performance are compared and analyzed.The simulation results show that the balance between the suppression of noise and the anti-frequency offset can be achieved by M-partial correlation method.Finally,the system synchronization performance based on the master node selection in MESH network is simulated and analyzed.The system synchronization performance of MESH network under different master nodes is simulated to verify the robustness and rationality of the master node selection.Besides,the effect of synchronous signal accumulation on the synchronization performance of the MESH network system is also simulated and analyzed.The results show that the accumulation of synchronous signals can improve the synchronization performance of MESH networks,but it will not change the priority of the master nodes.