The Direct Sequence Spread Spectrum System Simulation And Implementation By FPGA

Communications technology is developing rapidly in recent years。Every day, new changes in the fierce competition conditions. Spread spectrum communication, as a mainstream communications technology in recent years, is used more and more widely. Frequency communication technology research has also entered a new phase of3G communications; we often say that its root is based on spread spectrum communications technology base. Prospects for the application of spread spectrum technology more widely. FPGA chip is more powerful, making VHDL programming on the flexible design of digital integrated circuit modular design, can generate simulation test before the chip to shorten the design cycle. Combination the EDA technology of spread spectrum technology is very valuable. This paper focuses on one of the most common DSSS system to research, early in the design of System View software simulation, and finally in the process of spread spectrum communication is implemented by FPGA.FPGA has the characteristics of high-speed parallel processing and all hardware implementation, we can use the Quartus II9.0and electronic circuit design tools to completion the direct sequence spread spectrum system software simulation and hardware circuit design. Through the simulation and experiment, it increases processing speed and reduces the hardware delay. With the pipeline and technology, we improve the system of parallel processing capabilities. And the system can be adopted to modify and upgrade procedure, it is more flexible than the dedicated chip. At the same time, due to the high degree of integration, the system stability and reliability is improving. Therefore, design a full FPGA technology to achieve spread spectrum communication receive and send system has strong practical applications.The main contents of the objectChapter1, analysis of spread spectrum communication status and development trends.Chapter2, first introduced the basic theory of the spread spectrum communication, and the techniques used.Chapter3, began to talk about the DS system to analyze the composition principle, principle of transmission, performance, advantages and disadvantages.Chapter4, introduces the System View simulation software, the software by setting different parameters, simulation and testing of Direct Sequence Spread Spectrum Communication system function, according to the view the communication quality of the output waveform.Chapter5, the design of DSSS system by the FPGA implementation of the send and receive parts.Chapter6, summary of the thesis conclusions and look to the future to achieve a higher level of spread spectrum communication.