Research And Design Of Phase Controllable Millimeter-wave Transmission Link Based On FPGA

With the development of mobile Internet technology,the data transmission volume of mobile communications has grown rapidly,and existing wireless communication systems have been unable to meet the development needs of the information society.To meet the needs of users for high-speed transmission,telecommunication equipment manufacturers and operators have begun to rapidly promote the deployment of 5G communication systems,and 5G terminal equipment has also begun to go on the market.At present,the commercialization of 5G communication systems is mainly in the Sub-6 GHz frequency band.Due to technical difficulties and cost issues,the millimeter-wave frequency band with richer bandwidth resources has not yet begun to be applied.The research content of this thesis comes from the National Natural Science Foundation project.This thesis designed and implemented multi-channel phase-controllable millimeter-wave transmission link,which provides millimeter-wave source for millimeter-wave array antenna.The main research contents are as follows:(1)The mixing principle and transmitter structure were studied.Based on the digital intermediate frequency(IF)transmitter structure and In-phase/Quadrature(I/Q)mixing principle,a system design scheme for the multi-channel millimeter-wave transmission link is proposed.(2)The principle of direct digital synthesis(DDS)and high-speed serial transmission protocol were investigated.DDS circuit and JESD transmit core based on Field-Programmable Gate Array(FPGA)were designed,and high-speed data transmission was realized between FPGA and Digital-to-Analog Converter(DAC).The DDS circuit based on FPGA generated digital baseband signals.The DAC performed digital quadrature modulation and digital-to-analog conversion on the digital baseband signals,and outputted multi-channel IF signals with controllable phase and frequency.(3)Combining the digital IF module with the mixer development board to build a single-channel millimeter-wave transmission link.Through the testing of the transmission link,the principle of mixing was verified,and a single-channel millimeter-wave signal with controllable frequency was output.(4)Based on the test results of the digital IF module and the single-channel millimeter-wave transmitting link,the problems of component selection,dielectric board materials,and transmission line structure were studied.A millimeter-wave mixing module Printed Circuit Board(PCB)based on the I/Q mixing structure was designed.The PCB can output multi-channel millimeter-wave signals.