Design Of Miniaturized MIMO Transceiver And Receiver System Based On Software Defined Radio

In recent years,with the advantages of small size,flexible control and strong adaptability,small unmanned aerial vehicle(UAV)has been more and more widely used in military strikes and disaster rescue.However,the UAV communication spectrum environment is complex and there are many interference factors,so the data link communication system has higher and higher requirements for equipment size,communication anti-interference ability,spectrum utilization rate and scheme reuse.In order to meet the requirements of miniaturization and flexible communication function of UAV data link,this thesis combines Software Defined Radio(SDR)and multiple input multiple output(MIMO)technology,designed a transceiver system,and its data link communication capability is verified on highly integrated hardware platform.The main contents of this thesis are as follows:This thesis summarizes the basic theory,composition structure and key technologies of SDR,conducts research on hardware platform,digital processing algorithm and UAV data link in international and domestic,and analyzes the advantages of SDR and MIMO technology in data link system.According to the application context requirements for RF transceiver performance and digital signal processing chip resources,the differences in power consumption,size and RF performance of mainstream SDR hardware platform are compared,and the SDR chip AD9361 from ADI Company and Xilinx ZYNQ-7000 series SOC chip are selected as the platform core.This thesis analyzes the functional requirements of RF and digital circuits,evaluates the power consumption and clock resource distribution,and realizes the hardware platform including DDR3 data storage,gigabit Ethernet data transmission and multi-chip AD9361 radio frequency functions.Build the data transfer system on ZYNQ SOC.Based on the ARM processor system,the driver of AD9361 is designed to realize the software control of multi-chip AD9361 communication function.In the part of programmable logic,baseband digital signal processing modules such as serial communication,encoding and decoding,digital frequency synthesis and raised cosine-rolloff filtering are designed,and digital interface logic between AD9361 and ZYNQ PS-PL is configured.The communication data link of the system is verified by loading DPSK modulation and demodulation technology.Based on the hardware platform designed in this thesis,the system storage,interface transmission,multi-channel transmission,receiving function verification is completed,and the power supply performance and multi-frequency point transmission spectrum in the wide band range are tested.Multiple channels of transmitting and receiving end of MIMO system work independently at different frequency points,and the host computer sends data frames to verify the modulation and demodulation function of the system.There is no frame loss in the loop transmission process with 3.2 kbps data amount,and the data link test and analysis of the miniaturized MIMO system based on software radio is completed.