Research And Implementation Of Key Technologies In Wideband HF Spread Spectrum Communication System

This thesis lays emphasis upon the research of the key technologies and theimplementation of some parts in this system.Firstly, an HF wideband data transmission scheme based on direct sequencespread spectrum is presented, focusing on analysis of the key technologies, includingthe error control coding, soft spread spectrum, shaping filter, PN of pseudo-random,BPSK coding, synchronization and other key technologies. Then, the application ofthese key technologies in the system project is analyzed.The implementation scheme of this system is designed, which is based on thegiven hardware platform. By analyzing the implemented methods of each module inthe system scheme, I determine to use the method of SOPC (System on aProgrammable Chip) and FPGA logic modules combination. The SOPC developmentbased on embedded soft-core processor is a key work of this thesis, including therealization of error control coding based on SOPC, the interface with the PC, and theinterface between SOPC and FPGA logic modules. A method of using a user IP core toachieve the data exchange between SOPC and FPGA logic modules is prensented inthis thesis. Finally, these modules are tested on the hardware platform. The test resultsshow that each module can correctly achieve the corresponding functions.