本科毕业设计（论文）王龙

西安文理学院本科毕业设计（论文）

致谢

本次毕业论文设计是在刘密歌老师不辞辛苦的指导下完成的。刘老师作为一名优秀的、经验丰富的教师，具有丰富的专业知识和实践经验，在整个论文仿真设计和论文写作过程中，对我进行了耐心的指导和帮助，提出严格要求，引导我不断开阔思路，为我答疑解惑，鼓励我大胆创新，使我在这一段宝贵的时光中，既增长了知识、开阔了视野、锻炼了心态，又培养了良好的实验习惯和科研精神。在此，我向我的指导老师表示最诚挚的谢意！

在论文即将完成之际，我的心情久久无法平静，从开始选题到顺利论文完成，有不知多少多少可敬的师长、同学、朋友给了我无数的帮助。在学校的学习生活即将结束，回顾四年来的学习经历，面对现在的收获，我感到无限欣慰。为此，我向热心帮助过我的所有老师和同学表示由衷的感谢!

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西安文理学院本科毕业设计（论文）

参考文献

[1] 樊昌信，曹丽娜﹒通信原理﹒北京：国防工业出版社，2008.3:210

[2] 张志涌 杨祖樱等﹒MATLAB教程R2010a﹒北京：北京航空航天大学出版社﹒2010.8

[3] 张肃文﹒高频电子线路﹒北京：高等教育出版社﹒2004:463

[4] 王兴亮﹒数字通信原理与技术（第二版）﹒西安：西安电子科技大学出版

社,2000:210

[5] 邵玉斌.Matlab/Simlink通信系统建模与仿真实例分析.清华大学出版社，2008 [6] 常华，袁刚，常敏嘉.仿真软件教程.清华大学出版社，2006 [7] 沈振元，等.通信系统原理.西安：西安电子科技大学出版社，2004

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西安文理学院本科毕业设计（论文）

附录

On Building BPSK Modulation and Demodulation by Software

BPSK is a kind of digital modulation mode. Called, binary phase shift keying (BPSK) : use to transmit digital information carrier phase change, the amplitude and frequency remains the same.

Digital modulation demodulation can be divided into the following kinds:

1, The phase shift keying (PSK) : with the plus or minus of the digital modulation signal control of carrier phase. Starting when digital signal amplitude of the timing and carrier phase take 0; When the digital signal is negative, the amplitude of the carrier when starting phase in PI. Sometimes also on behalf of two or more symbols of the multiphase system of phase modulation is called phase shift keying. Phase-shift keying anti-interference ability is strong, but in the demodulation needs to have a correct reference phase, namely the need of coherent demodulation.

2, Amplitude shift keying (ASK) : with digital carrier modulation signal control on and off. 0 as in binary, not send carrier, when sending 1 send the carrier. Sometimes also called on behalf of more than one symbol of multilevel amplitude modulation amplitude shift keying. Amplitude shift keying but poor anti-jamming capability and easy to implement. 3, Frequency shift keying (FSK) : with the plus or minus of the digital modulation signal controls the frequency of the carrier. When digital signals for timing carrier frequency for f1, amplitude of the carrier frequency when digital signal amplitude of the negative is f2. Sometimes also on behalf of two or more symbols of multi-band frequency modulation called frequency shift keying. FSK can distinguish pathways, but the anti-interference ability is inferior to phase-shift keying and differential phase shift keying. BPSK modulation demodulation method is as follows: first, the input of the random binary code waveform by single polarity conversion for the bipolar code, papers again with carrier multiplied after complete modulation process, through a band-pass filter papers on carrier's multiplication, after a low pass filter, finally gave the complete coherent demodulation process through sampling.

In this paper, using of SIMULINK in MATLAB software components, SIMULINK is a visualization of MATLAB simulation tool, is also present in the dynamic system of modeling and simulation, etc. One of the most widely used tool. Specifically, Simulink is a system used for dynamic modeling, simulation and analysis software package, it supports linear and nonlinear system, continuous and discrete time model, or a mixture of both. System can also make a variety of sampling frequency of the system, and can be a

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西安文理学院本科毕业设计（论文）

multi-process system. Simulink environment to work in a few years of development, has become the mainstream of academic and industry used to modeling and simulation toolkit. In the Simulink environment, it provides users with block diagram modeling graphical interface, using the structure drawing model figure like hand in model on the paper freely, is convenient, so users only need to simply click and drag the model will be finished, and can direct system simulation, rapid simulation results are obtained。ts main characteristic is: 1, modeling is convenient and fast; 2, easy to model analysis; 3, superior performance. Simulation software package it with the traditional differential equation and difference equation model, compared with the advantages of more intuitive, convenient and flexible. Simulink module library (or libraries) containing Sinks (output), the Sources (input), Linear (Linear) and Nonlinear (Nonlinear link), the Connection (connections from the interfaces) and Extra (other) link with different functions such as operation or function of Simulink library module (or library functions), and each corresponding functional modules are included in the model library, the user can also according to the need to customize and create your own modules. Using Simulink model can be created with hierarchical structure, so the user can use from top to bottom or from bottom to top of the structure create the model. Users can watch the model starting from the top, and then use the mouse to double-click on the subsystem module, to view the content below level, and so on, so you can see the details of the entire model, to help users understand the model of the relationship between structure and the modules. After a model defined, the user can through the menu or Simulink of MATLAB command window type in commands to simulation for it. Menu mode is very convenient for interactive work, the command line mode and for running the simulation of batch is very useful. Using Scope module and display module, the other can look up at the same time of simulation can be immediately to the simulation results, if change the parameters of the modules and can be observed in the corresponding results, to run again this applies to the question of causation. The simulation results can also be stored into the MATLAB workspace do post-processing. Model analysis tools include linearization and finishing tool, all the tools and MATLAB Simulink application kit contains the tools themselves. As a result of the MATLAB and SIMULINK integrated together, so users can in under the condition of the two models are simulated, analyzed, and modify the model. But can't work independence from MATLAB Simulink.

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