Research Of Downlink Synchronization Algorithms And Simulation Based On LTE

Downlink synchronization was analyzed in detail in this thesis,and the research background.Analysis of several important characteristics,such as sequence generated by the different root sequences,the characteristics of the imaginary part are opposite.In the M sequence,the conclusion of the sequence m0 is always less than sequence m1 and arithmetic relation of community groups were summarized.LTE standard is the current mobile communications standards.This thesis mainly studied the OFDM technology,and downlink synchronization processes are studied in detail? After that,this thesis was combined the important characteristics of these findings,the algorithm was improved to optimize and solve the downlink synchronization process to avoid unnecessary repetition of large real-time operation,and optimization of the consumption of the local storage resources,speed up the downlink synchronization,improve terminal access performance.In the process of realization of downlink synchronization,this thesis mainly used the improved synchronization based on cross-correlation algorithm to realize the purpose of synchronizing signal,and then according to the master synchronization signals timing synchronization and ML algorithm frequency offset estimation,hypothesis algorithm based on cyclic prefix length to determine which type the cyclic prefix use,and the use of parity sequence based maximum M related synchronization algorithm of the signal SSS.Finally,series of algorithms were simulated.In this thesis,a set of improved downlink synchronization algorithm can satisfy demand.