約四千三百余字

摘要　本文闡述了擴展頻譜通信技術的理論基礎和實現(xiàn)方法，利用MATLAB提供的可視化工具Simulink建立了擴頻通信系統(tǒng)仿真模型，詳細講述了各模塊的設計，并指出了仿真建模中要注意的問題。在給定仿真條件下，運行了仿真程序，得到了預期的仿真結果。同時，利用建立的仿真系統(tǒng)，研究了擴頻增益與輸出端信噪比的關系，結果表明，在相同誤碼率下，增大擴頻增益，可以提高系統(tǒng)輸出端的信噪比，從而提高通信系統(tǒng)的抗干擾能力。
關鍵詞　擴頻通信,　信噪比， 誤碼率，　擴頻增益

Simulation of the Spread Spectrum Communication System
Based on MATLAB
Abstract: The theory base and realizing methods of the spread spectrum communication technology was presented in this study. The simulation model of the spread spectrum communication system was built by using SIMULINK, which is provided by MATLAB. In addition, each module of the simulation model was introduced in detail，and pointed out the problems that must be pay attention to in the system simulation. On the basis of the designed simulation conditions, the simulation program was run and the anticipant results were gained. Moreover, the relationship between the spread spectrum gain and the fan-out error rate was also studied by use of the simulation system. The results showed that on the base of the same error rate, if the spread spectrum gain was enlarged, the Signal-to-Noise of the system fan-out would be enhanced and the anti-jamming capability of the communication system would also be enhanced.
Keywords: spread spectrum communication, Signal-to-Noise, error rate, spread spectrum gain

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