FPGA Implementation And Verification Of Wideband HF Spread Spectrum Communication System

The research objective of this thesis is, using direct sequence spread spectrumtechnology and the idea of software radio, to design and implement burst datatransmission under low SNR condition of wideband HF channel on hardware platformof Xilinx FPGA. The content of this thesis is, using hardware logic resources of FPGA,to implement and verify part of the algorithm module of the system.Firstly, the author does research on the spread spectrum and multi-rate signalprocessing theory, and summarizes the design and implementation block diagram ofthe spread spectrum system. Afterwards, the system is divided into modules accordingto the top-down design approach; On this basis, the author makes a theoreticalanalysis、design and simulation of the hardware implementation of each module.Finally, the whole system is analyzed on its function simulation、utilization of systemresource and timing; the hardware performance of A/D and D/A chips is tested; the teststructure of intermediate frequency was designed, and the joint debugging and testingof the digital up-conversion and down-conversion module were made from sender toreceiver. The results of the experiments verify the correctness of the module ofintermediate frequency.