Research And Implemention Of Cell Search For LTE-A Air Interface Monitoring Analyzer

The LTE-A system,as the mainstream of wireless communication application technology,has been used more and more widely in scenarios of high capacity and large connectivity.A wide range of mobile communication test solutions for the system are available.At present,the vast majority of market share of high-end test instruments is concentrated in international communication manufacturers.While the number of domestic test equipment is small and the functions are not complete,and there is a big gap between them and high-end test instruments.Therefore,designing a new wireless network analysis and optimization instrument meets the needs of network testing,which is urgently needed and important.Based on the LTE-A system protocol standard and the demand analysis of the LTEA air interface monitoring analyzer,in this thesis,the frequency domain segmentation overlap correlation algorithm is adopted for the cell synchronization module in the physical layer baseband signal processing scheme,and a synchronization scheme is designed at the same time.Then the FPGA hardware design is performed on the cell synchronization module and the system message parsing module.Finally the functional simulation test is performed by means of the Vivado simulation platform.The main work is as follows.1.The synchronization module in baseband signal processing scheme is studied in this thesis.Firstly,the algorithm of synchronous signal detection in cell search is studied.Then the performance of some common detection algorithms in engineering application is compared and analyzed.Finally,the frequency domain segmentation overlap correlation algorithm is proposed and applied to the designed cell synchronization scheme according to the requirements of the project.The simulation results show that there are obvious peaks in the three phases of the synchronization scheme,and the correct cell information is obtained.2.Based on the research of the synchronization scheme and the system message parsing scheme,this thesis completes the overall scheme construction of the top-level module and the structural design of each sub-module according to the top-down design idea,and focuses on the FPGA design of the synchronization signal detection module.The processing-storage method adopted by the synchronization scheme greatly reduces the storage space compared with the storage-processing method.3.In this thesis,the functions of synchronization module and system message parsing module are simulated and tested with the help of Vivado simulation platform.The results show that the results of synchronization module are consistent with the simulation results of MATLAB software,the time consumption is 1.707 ms,and each resource occupancy rate is below 13%.After that,the whole machine is tested and passed the test of the CAICT,thus verifying the correctness and effectiveness of the scheme and meets the application requirements.The exploration and research results of this thesis provide theoretical support and effective technical solutions for the research of 5G cellular mobile communication,and establish the foundation for the development of 5G air interface monitoring instruments.