Design And Implementation Of 5G NR Cell Search System For Spectrum Monitoring

With the development of communication technology,more and more communication systems and expanding 5G application scenarios have increased the possibility of electromagnetic wave interference.The current communications environment has become more complex than in the past,creating new challenges for electromagnetic environment monitoring.With the rapid development of 5G applications,electromagnetic environment monitoring equipment urgently needs to be equipped with an analysis channel capable of analyzing and measuring 5G signals,so as to quickly identify the identity of the target signal and accurately locate the problem in the interference investigation scenario.In response to this problem,the thesis focuses on the analysis method of 5G physical broadcast channel based on the 3GPP NR physical layer protocol standard for electromagnetic environment monitoring,and designs and implements a signal detection and analysis system for 5G synchronization signal analysis based on FPGA.The main research contents of the thesis are as follows:First,the thesis studies the process of 5G NR cell search in detail,and builds a 5G synchronization signal transceiver link simulation platform based on MATLAB.In the thesis,algorithm optimization is carried out for PSS correlation detection and frequency offset estimation,and algorithm design and analysis under various channel conditions are carried out.For hardware implementation,considering the algorithm performance,application scenarios and implementation complexity,the cell search algorithm and hardware implementation structure are designed,and the system test is completed.Second,the thesis studies the PBCH channel estimation and equalization methods.For the problem of pilot frequency not being fixed and some locations being nonuniformly distributed,a detailed analysis and implementation-oriented solutions are given.Through the simulation analysis and optimization of channel estimation,channel interpolation and channel equalization algorithm,combined with the characteristics of hardware implementation,a hardware implementation scheme for PBCH channel estimation and equalization is designed,and the functional test is completed on the test platform.Finally,the thesis completes the whole system,and builds a test platform based on FPGA and RF transceiver modules.A special 5G signal test signal generation unit is designed,the system function verification is completed,and the reception and analysis of5 G air interface signals are realized.