Research And Implementation Of Cell Search For 5G Road Tester

With the large-scale construction of 5th Generation Mobile Networks(5G)base stations at home and abroad,the market demand for network test instruments continues to grow,and it has been monopolized by foreign high-end communication instrument manufacturers for many years.The function of domestic test instruments is relatively single,and there is a big gap in performance between domestic test instruments and foreign advanced instruments.Relying on the special project "R&D and Application of 5G Road Tester" in Chongqing,this thesis focuses on the synchronous algorithm and synchronous scheme of cell search in 5G system,so that to work out the synchronization scheme of cell search that meets the needs of the project is designed.In addition,the scheme has also been simulated and tested.According to the characteristics of 5G system,this thesis optimizes the synchronous algorithm in the traditional scheme and designs a new cell search scheme that conforms to the 5G system.For different frequency offset and SNR environments,three typical Primary Synchronization Signal(PSS)coarse synchronous algorithms and two PSS fine synchronous algorithms are compared.The thesis analyzes the strengths and weaknesses of each algorithm.In the end,to meet the need of the project,sliding cross-correlation algorithm is selected to apply PSS coarse synchronization and PSS fine synchronization.To solve the high detection complication of PAPR,the thesis proposes a multi group judgment screening method,which greatly reduces the detection complexity.The synchronization scheme is divided into four stages.MATLAB simulation have been carried outout for these four stages,which proves the reliability of the synchronization scheme.According to the proposed synchronization scheme and optimized synchronization algorithm,following the top-down field programmable gate array(FPGA)design idea as well as making full use of the pipeline,module reuse and parallel design idea.This method can process thirty groups of data and thirty maximum values can be acquired with one search.The PAPR detection scheme in cell search is designed by FPGA,and the simulation test is carried out by using Model Sim simulation platform.The results are completely consistent with the MATLAB test,which proves the reliability of the hardware design scheme.The designed cell search module is applied to the baseband board of 5G road tester for board level test verification,whose result showes that every resources occupation rate is less than 30% and with the test on the third platform,the cell research is proved to be rational and feasible so that it can meet the needs of 5G road tester project.This research provides a solid theoretical basis and reliable technical solutions for the future research and development of communication test instruments.