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******大学 学号： 110****** 本科毕业论文
话音信号的2DPSK调制系统
学院名称： 物理与信息工程学院 专业名称： 电子信息工程 年级班别： 2011级电信112 姓 名： ****** 指导教师： *******
2015年05月
河南师范大学本科毕业论文
摘 要
现代通信系统要求通信距离远、通信容量大、传输质量好。作为其关键技术之一的调制技术一直是人们研究的一个重要方向。从最早的模拟调幅调频技术的日臻完善，到现在数字调制技术的广泛运用，使得信息的传输更为有效和可靠。在二进制数字调制中，当正弦载波的相位随二进制数字基带信号离散变化时，则产生二进制移相键控(2PSK)信号。因为在调制过程中，2PSK调制容易出现反向工作问题，影响2PSK 信号长距离传输。为克服此缺点，并保持2PSK信号的优点，将2PSK体制改进为二进制差分相移键控体制。二进制相移键控的基带信号是由相邻两码元相位的变化来表示的，它与载波相位无直接关系，因此在实际设备中，二进制相移键控得到了广泛的运用。
课程设计介绍了话音信号的2DPSK调制系统，建立相关模型并对信号进行模拟调制和仿真。分析了信号源、差分器、调制和加噪模块的功能，最后用差分相干法和极性比较法对信号进行了调试。经调试后，信号源与抽样判决之后的信号，图形基本一致；不过前者调试后，信号波形有延迟，而后者没有。
关键词： 2PSK,2DPSK，调制系统
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河南师范大学本科毕业论文
Abstract
Modern communication systems require communication distance, large capacity, good transmission quality of communication. As one of the key technologies of modulation technology has always been one of the important research direction to people. From the earliest fulfillment of analog modulation frequency modulation technology, the digital modulation technique is widely used now, makes the information transmission is more effective and reliable. In binary digital modulation, when sinusoidal carrier phase change with discrete binary digital baseband signal, are produced by the binary phase shift keying (2 PSK) signal. Because in the process of modulation, 2 PSK modulation is prone to reverse the work problem, affect the 2 PSK signal long distance transmission. To overcome this drawback, and maintain the advantages of 2 PSK signal will be 2 PSK system improvement for binary differential phase shift keying system. Baseband signal of binary phase shift keying is said by changes in the adjacent two yards yuan phase, it and carrier phase has no direct relation, so in actual equipment, binary phase shift keying has been widely used.
Paper introduces the relative phase shift keying signal modulation principle, and establish related model for simulating the signal modulation and simulation. Analyzing the splitters,modulation, and poor signal source, add noise module functions, with differential coherent and polarity comparison, finally has carried on the debugging to signal. After debugging, the signal source and the sampling signal after the verdict, basically the same graphics;But the former after debugging, signal waveform with a delay, while the latter is not. Keywords: 2PSK ，2DPSK，the system of modulation
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河南师范大学本科毕业论文
目 录
摘 要?????????????????????????????????? Abstract???????????????????????????????? 前 言??????????????????????????????????1 第1章 绪论???????????????????????????????2 1.1 2DPSK简述 ??????????????????????????????2 1.2 System view 简述 ??????????????????????????2 1.3调制系统简述?????????????????????????????3 第2章 2DPSK基本原理 ??????????????????????????5 2.1 2DPSK信号原理????????????????????????????5 2.2 话音信号的2DPSK调制原理??????????????????????7 第3章 建立模型?????????????????????????????9
3.1差分和逆差分变换模型??????????????????????9 3.2 带通滤波器和低通滤波器的模型????????????????????9 3.3 抽样判决器模型???????????????????????????10 3.4 总模型框图?????????????????????????????11 3.4.1 2DPSK模拟调制和积极相干解调法仿真?????????????????11 3.4.2 2DPSK模拟调制和差分相干解调法仿真?????????????????11 第4章模块功能?????????????????????????????13 4.1信号源 Source library????????????????????????13 4.2差分器 ???????????????????????????????13 4.3 调制和加噪模块???????????????????????????14 第5章调试过程及结论??????????????????????????15
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