The Emulation By SYSTEMVIEW And Implement Using FPGA Of Direct Spread Spectrum Communication System (Design Of Sending Side)

The spread spectrum communication system has stronger ability of resisting jamming,narrow band,and multipath interference than that of the conservation communication systems.And it also has the characteristics of low probability of intercept and multiple access secure communication.This thesis primarily discussed the sending side of the spread spectrum communication system based field programmable gate array(FPGA) ASIC chip.The design technique of FPGA related to communication system has been discussed in this thesis ,and this system has been emulated by communication emulation software SystemView.Finally,the sending side of the spread spectrum system has been designed and implemented based on the FPGA development platform MAX+plusII belonging to the Altera Company and the corresponding circuit has been designed by Protel99 software. The total system can be divided into two parts.In the first part the program by VHDL language of the total system has been edited and compiled ,and the function emulation and time emulation of the separate module of the system and total system has been made by MAX+plusII.In the second part,the circuit board of the system based in FPGA chip EPF10K10LC84-3 has been designed and tested,finally has implemented appointed function. Chapter one introduces the characteristics of the spread spectrum communication system and the development related to spread spectrum ASIC chip at present in the world.It also introduces the outline and the research idea of the thesis. Chapter two mainly introduces the background related to the theory.It contains the despread spectrum,baseband demodulation,synchronization and the technology of modulate and demodulate in the spread spectrum system. Chapter three introduces the communication emulation software SystemView and emulate the model of spread spectrum with it. Chapter four illuminates the basic principle of Field Programmable Gate Array(FPGA) and how to select the FPGA chip applied in this system. Chapter five introduces VHDL hardware description language and MAX+plusII,which is the development platform of Altera Corp. Chapter six expatiate the total design of the system,include the software unit and the...