| Baseband signal processing is an important part of the radio frequency radio system.The paper studies digital baseband processing technology based on DSP,aiming to design a digital baseband experiment platform that simulates real space scenes,through which baseband processing algorithms can be quickly verified and implemented.Software radio is an important supporting technology for the digitization of radio systems.It consists of digital baseband and radio frequency modules.The radio frequency architecture adopts a zero-IF scheme,which has a simpler design than superheterodyne.Based on the theory of radio frequency architecture,design an experimental platform with radio frequency front-end,FPGA,and DSP as the main body.Research the theory of mixing,sampling and filtering in digital baseband processing,design baseband processing algorithms for the experimental platform,and realize the transceiver and processing of radio frequency signals.Based on the design plan,the selection of the main components was completed,and finally the hardware plan was constructed using BF609,ZYNQ-7020,and AD9361,and the corresponding peripheral circuits were introduced.Focus on the working principle of the radio frequency front end and the interconnection mechanism of the ZYNQ chip based on the AXI bus.The FPGA project is constructed according to the interconnection mechanism,which mainly includes the AD9361 driver module,DMA control module,and FIFO module.The digital logic module is mounted as a peripheral to the PS.On the bus.Design system software for PS,including module initialization and data interaction protocol with DSP.Design test cases for the experimental platform to verify the functional design.The test cases mainly include: transmission control protocol verification between DSP and PS,transmission channel verification,receiving channel verification,signal modulation and demodulation algorithm verification.The test results show that the experimental platform can realize the processing of baseband signals and can be used as a baseband signal processing platform. |
