Research On Carrier Synchronization And Frame Synchronization System In 5G Communication System

With the continuous development of mobile communication,5G is gradually moving from theory to reality.Due to the complexity of future business scenarios and the diversity of business requirements,people have put forward higher requirements on 5G transmission speed and reliability.Multi-carrier transmission technology,one of the core technologies,is a major prerequisite for ensuring the realization of these high standards.Synchronization technology is not only one of the key technologies of multi-carrier technology,but also a key factor in determining the performance of the system.Firstly,this thesis introduces the basic principles,advantages and disadvantages of OFDM technology and several new multi-carrier technologies.Then this thesis studies the synchronization requirements of OFDM systems and analyzes the influence of synchronization deviation.Four classical synchronization algorithms are introduced and three algorithms based on training sequence are simulated and analyzed.By comparing the performance of three algorithms,the results show that Park algorithm has the highest accuracy in timing synchronization estimation.Subsequently,the thesis analyzes and compares fast implementation algorithms of FBMC system.The mutual fuzzy function is used to analyze the synchronization deviation,then the feasibility of applying OFDM synchronization algorithm in FBMC is introduced.After analysis,the research of FBMC synchronization algorithm is introduced.After researching and simulating several algorithms based on synchronous training symbols,an improved algorithm is proposed.The algorithm considers the influence of noise factors on timing accuracy,eliminates it,and extends the processing interval,which adds more useful information.The simulation results show that the performance of the algorithm has been improved.Finally,this thesis studies the GFDM symbol structure and analyzes the performance of the system based on three different receivers.The synchronization deviation of MF receiver and ZF receiver is simulated and analyzed,and the seriousness of the influence of synchronization deviation is obtained.Then the synchronization algorithm based on training symbols is studied.Firstly,the synchronization algorithm of insertion symbols is analyzed.In the process of restoring the information coefficient vector,a lot of calculation is needed in each step,which increases the workload of the receiver.Therefore,an improved algorithm of superimposed symbols is proposed.Considering the problem of out-of-band radiation,the superimposed symbols are processed by windowing processing and filtering expansion.The simulation and comparison verify the superiority of this method and the algorithm.