Research And Implementation Of PRACH Preamble Signal Detection Technology For 5G Terminal Simulator

The 5th Generation Mobile Communication(5G)terminal simulator use technology integration such as random access and multiple antennas to meet users' network performance requirements such as network experience rate and end-to-end delay.The first step for the User Equipment(UE)to establish communication with the generation Node B(g NB)in the mobile communication process is the random access preamble signal detection,whose detection performance directly affects the performance indicators and user experience of the communication system.Therefore,designing a high-performance random access preamble signal detection scheme is particularly important.Based on the development needs of the Chongqing Science and Technology Project "R&D and Application of 5G Terminal Simulation Equipment",this thesis studies the detection technology of random access to the preamble signal at the receiving end of the 5G terminal simulator and gives an Field-Programmable Gate Array(FPGA)implementation scheme.Focus on solving the problems of computational complexity,preamble detection success rate,and calculation delay during the preamble signal detection process.In order to improve the overall detection performance of the preamble signal,this thesis proposes an improved random access preamble signal detection design scheme.The main research contents are as follows:1.Aiming at the receiving part of Physical Random Access Channel(PRACH)preamble signal,the multi-level down-sampling filtering algorithm in time domain is mainly studied.By adding anti-aliasing filtering and reducing the order of single-stage filtering,the algorithm improves the accuracy of analyzing the preamble signal and reduces the implementation difficulty of FPGA.Aiming at the preamble detection part of PRACH,a multi-window sliding peak detection algorithm was proposed.By setting different window lengths for sliding peak detection,the peak detection success rate was improved.Finally,the overall link performance of PRACH is simulated by MATLAB,the required signal-to-noise ratio of the scheme in this thesis is better than the traditional design scheme by more than 1d B.Finally,the performance of PRACH's overall link is simulated by MATLAB and compared with the performance of traditional design scheme,which verifies the feasibility of this scheme.2.According to the FPGA structure-oriented design method,the structural design of each module at the PRACH receiver is analyzed.The analysis focuses on the spectrum shift,multi-level down-sampling filtering,frequency-domain correlation detection module in the PRACH preamble signal receiving scheme,and the implementation process of equal gain combining,time-domain sliding mean filtering and multi-window sliding peak detection module in the PRACH peak detection design scheme;Finally,a module test case is written and combined with Model Sim simulation,the validity of the overall design scheme is verified.3.The layout of the PRACH preamble signal detection design scheme is carried out through the Vivado integrated design environment,the data is captured using the Vivado data capture function,and the baseband board interface test and hardware resource occupation analysis are performed to verify the feasibility of the results.