Research And Implementation Of PRACH Receiver Detection Technology For LTE-A Air-Interface Monitoring Analyzer

With the increasing demand of users for the performance of mobile communication networks,new wireless network analyzer and optimization instruments have been paid more and more attention.Therefore,the development of a new type of air-interface monitoring analyzer is the trend.The random access procedure is the first and significant step of the mobile communication's establishment between the user equipment and the base station.Therefore,the performance of random access will directly affect the efficiency of the communication system and the users' experience.The random access preamble detection technology was deeply studied under LTE-A air-interface monitoring analyzer in this thesis.Focusing on the problems of computational complexity,peak detection success rate and time latency in the preamble detection technology,and aiming at achieving high performance peak detection,a design scheme of physical random access channel receiver preamble detection technology is proposed.The main research contents are as follows:First,the key algorithms of the PRACH receiver are analyzed.The PRACH receiver is divided into two parts: the preamble reception and the peak detection.The time-domain filtering down-sampling algorithm and the preamble peak detection algorithm are studied,respectively.Then,the multi-stage filtering down-sampling algorithm and the multi-sliding window peak detection algorithm are applied to the design scheme of the PRACH receiver preamble detection.Finally,the PRACH receiver link is simulated by using MATLAB.The simulation results show that compared with the original scheme,the design scheme improves the success rate of the preamble detection.Second,according to the top-down design methodology,the top-level module of the PRACH receiver and each sub-module are designed.The PRACH receiver consists of the spectrum transfer module,the multi-stage down-sampling filtering module and the frequency-domain correlation peak detection module.By utilizing ModelSim software,each sub-module and the whole scheme of the PRACH receiver were simulated and its correctness was verified.Third,the FPGA chip XC7Z100-2FFG900 I was used in LTE-A baseband board to test the design scheme of the PRACH receiver preamble detection.Then,the agreement of the board-level tested results and the ModelSim simulated results was analysed.The rationality of the design scheme was verified according to the hardware resource consumption of the PRACH receiver.The results of uplink communication between the user equipment and the base station were checked by LTE-A air-interface monitoring analyzer,and the feasibility of the design scheme was verified.The main research content of this thesis is the PRACH receiver preamble detection technology of the LTE-A air-interface monitoring analyzer.An FPGA implementation scheme is designed to provide a practical solution for the realization of the random access procedure of monitoring analyzer.