Design And Implementation Of OTA Test System For Millimeter Wave 5G Terminal Equipment

At present,5G has gradually started commercial use,and 5G terminal products have also been released one after another,but the frequency bands used are all FR1 low-band resources,and the millimeter wave FR2 band has not been used.With the continuous development of 5G technology,the FR2 millimeter wave band will eventually be adopted so that millimeter waves can truly achieve the peak rate of Gbit and the delay characteristics of millimeter level described by 5G.The terminal equipment must pass the certification test of the relevant certification body before listing to verify its RF performance.Therefore,the realization of the millimeter-wave 5G terminal test system has a great impetus for the commercialization of 5G,and the measurement results can provide performance optimization for the terminal equipment the direction is conducive to the improvement of products.This paper designs and implements a complete automated test system for 5 G end-user equipment working in the millimeter wave band,which can not only achieve missed testing but also use OTA(Over The Air)test methods to measure 5G terminal equipment.There are three main aspects:1.Research on test theory and test methods.Introduced the relevant theories of 5G terminal testing.The test indicators were described in terms of active testing(OTA testing)and passive testing.The main contents of active testing include directional measurement and gain measurement,OTA the main test is to measure the effective omnidirectional radiated power,total radiated power,effective omnidirectional sensitivity,and total radiated sensitivity.The above test indicators are studied and the design of the corresponding test plan is completed.At the same time,according to the test index and test plan,the coordinate system to be adopted by the test system and the polarization problem under different coordinate systems are analyzed,and the link calibration scheme is designed according to the plan.2.Design and implementation of hardware system and software system.Combine the test plan to design the overall plan of the hardware system,including test instruments,measurement darkroom,turntable and other hardware and link formation.After completing the hardware environment construction,the software system development begins.The software system includes two parts:test software and data processing software.The test software is composed of a parameter measurement module and an instrument driver module.The parameter test module is the system's operation center and implements the instrument's Connect,select test functions and configure test parameters,and send instructions to other modules to complete test functions;instrument driver modules are used to control hardware devices,such as test instruments,turntables.;data processing software consists of graphics processing modules and data processing modules,Is the core of the system calculation,is responsible for analyzing and processing the test data,obtaining the gain,total radiation power,total radiation sensitivity and other indicators,and displaying it in the form of a graphical interface or file,and the main lobe level and main The beam parameters such as lobe width,side lobe level and side lobe width are designed and implemented by the algorithm.Finally,the modules are integrated through a human-computer interaction interface to form a complete automated test software system.3.Test and verification of the system.After completing the implementation of the test system,the standard pyramid horn antenna was simulated and designed to obtain the ideal simulation results,and the actual measurement of the simulated pyramid horn in the 28GHz frequency band was performed to obtain the actual measurement data of the system and the simulation value.Compare and verify the correctness of the test system and the functionality of the software.After the actual test of 28G frequency band was carried out on 5G mobile phones.