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基于通信系统的信号源设计,自己的毕业论文，原创的，仅在本站独家提交，推荐下载摘要 信号源是通信设备和系统设计、调试和维护中不可缺少的仪器，实现信号源的设计有很多方案，本设计采用硬件设计方案，具有结构简单、成本低、体积小、使用方便及实用性强等特点。本文对于信号源的研究主要在于对基本信号的研究，其中包括常用的基本信号中的正弦...
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基于通信系统的信号源设计
自己的毕业论文，原创的，仅在本站独家提交，推荐下载
摘要 信号源是通信设备和系统设计、调试和维护中不可缺少的仪器，实现信号源的设计有很多方案，本设计采用硬件设计方案，具有结构简单、成本低、体积小、使用方便及实用性强等特点。本文对于信号源的研究主要在于对基本信号的研究，其中包括常用的基本信号中的正弦信号、脉冲信号、三角波信号和时钟信号，还包括通信系统中常用的DTMF信号和CMI码，也包括了模拟调制信号以及数字调制信号。
在常用基本信号的产生中，本文先用RC桥式振荡器产生可调的正弦波；得到正弦波后，让其经过一个迟滞型电压比较器，得到可调的方波；最后将输出的方波通过积分器，即可到三角波信号。时钟信号的产生是通过分频器来实现的，将4.096MHz的时钟信号通过分频器可以得到不同频率的时钟信号。对于通信系统中常用的DTMF信号，本文采用数字方法来产生与检测。产生的信号经过D/A转换器可得连续时间DTMF信号，本文采用的检测方法为戈泽尔算法。CMI码则使用了硬件搭设的方法，首先搭设一个由4个双D触发器组成的15位伪随机码产生电路，然后将输出的伪随机码输入搭设好的编码电路得到CMI编码。
在模拟调制信号产生与解调中，AM信号调制是直接将原信号加上直流分量然后再乘以一个载波来是实现的，其解调的方法是包络检波法。DSB信号的调制与AM相近，只是不加直流分量，解调是采用的相干解调法。对于数字调制信号，3种数字调制信号，均采用了模拟相乘法来进行调制，他们的解调也都是采用了相干解调法。
关键词： 信号源 通信 DTMF 仿真 Multisim Matlab
Design of the Signal Generator Based on Communication System
Abstract Signal generator is an essential equipment applied in communication device, system design, commissioning and maintenance. Designing and implementing a signal generator has many schemes. This design adopts the scheme of hardware design, which has the characteristics of simple structure, low cost, small size, easy to use and strong practicability etc.. In this paper, the study of signal generator lies mainly in the study of basic signal, including common basic signals such as a sinusoidal signal, a pulse signal, a triangular wave signal and a clock signal, the DTMF signal and the CMI code commonly used in a communication system, and the analog modulation signal and a digital modulation signal.
For the generation of common basic signal, we first generate an adjustable sine wave with the RC bridge oscillator. We let it pass through a hysteretic voltage comparator to get a tunable square wave after getting the sine wave. Finally, we let the square wave pass through an integrator to obtain a triangle wave signal. Generating a clock signal is realized by the divider. We can obtain the clock signals of different frequencies when letting a clock signal frequency of 4.096MHz pass through the divider. The DTMF signal is commonly used in communication system. In this paper, we generate and detect the signal with digital method. The continuous time DTMF signal can be got by letting the digital signal pass through the D / A converter. Detection methods used in this paper is the Goertzel algorithm. The generation of CMI code adopts the method of hardware erection. Firstly, we erect a 15-bit pseudo-random code generator circuit by four D flip-flops. Then we can let the exporting pseudo-random code pass through the encoding circuit to get the CMI code.
In terms of the generation and demodulation of an analog modulated signal, AM modulation signal can be achieved by coupling directly to the DC component of the original signal and then being multiplied by a carrier, which can be demodulated with envelope detector method. DSB modulation and AM modulation signal is analogous, but the former don’t contain a DC component, and the demodulation method is coherent demodulation. For digital modulation signals, three kinds of digital modulation signals are used to modulate the analog multiplication, they are also demodulated by coherent demodulation.
Key words: Signal generator Signal communication DTMF Simulation Multisim Matlab
目 录
第一章 绪 论 1
1.1 信号源综述 1
1.1.1 信号源简介 1
1.1.2 信号源发展的现状、水平和趋势 1
1.2 课题的研究意义 2
1.3 信号源设计方案现状 3
1.4 仿真软件概述 3
1.4.1 NI Multisim 概述 3
1.4.2 Matlab概述 4
第二章 常用的基础信号 5
2.1 常用信号信号总电路的设计 5
2.2 正弦波的产生 7
2.2.1 RC桥式正弦波振荡器电路构成 7
2.2.2 RC桥式振荡器的稳幅过程 8
2.2.3 RC桥式正弦振荡电路的设计与仿真 8
2.3 脉冲波的产生 10
2.3.1 脉冲波产生原理 10
2.3.2 脉冲波设计与仿真 11
2.4 三角波的产生 12
2.5 时钟信号的产生 13
2.5.1 时钟信号总电路设计 13
2.5.2 时钟信号电路仿真 14
第三章 通信系统中常用的信号 19
3.1 信令简介 19
3.1.1 信令的概念 19
3.1.2 用户终端发出的信令 19
3.1.3 交换机发出的信令 20
3.2 双音多频信号 20
3.2.1 DTMF信号原理 20
3.2.2 DTMF信号的产生 20
3.2.3 DTMF信号的检测 21
3.2.4 Matlab仿真程序分析 22
3.3 CMI码 24
3.3.1 CMI简要介绍 24
3.3.2 伪随机码发生器电路设计 24
3.3.3 CMI编码电路设计 25
3.3.4 CMI解码电路设计 28
第四章 模拟调制信号 30
4.1 调幅（AM） 30
4.1.1 AM调制原理 30
4.1.2 AM解调原理（包络检波） 30-b..
自己的毕业论文，原创的，仅在本站独家提交，推荐下载
摘要 信号源是通信设备和系统设计、调试和维护中不可缺少的仪器，实现信号源的设计有很多方案，本设计采用硬件设计方案，具有结构简单、成本低、体积小、使用方便及实用性强等特点。本文对于信号源的研究主要在于对基本信号的研究，其中包括常用的基本信号中的正弦信号、脉冲信号、三角波信号和时钟信号，还包括通信系统中常用的DTMF信号和CMI码，也包括了模拟调制信号以及数字调制信号。
在常用基本信号的产生中，本文先用RC桥式振荡器产生可调的正弦波；得到正弦波后，让其经过一个迟滞型电压比较器，得到可调的方波；最后将输出的方波通过积分器，即可到三角波信号。时钟信号的产生是通过分频器来实现的，将4.096MHz的时钟信号通过分频器可以得到不同频率的时钟信号。对于通信系统中常用的DTMF信号，本文采用数字方法来产生与检测。产生的信号经过D/A转换器可得连续时间DTMF信号，本文采用的检测方法为戈泽尔算法。CMI码则使用了硬件搭设的方法，首先搭设一个由4个双D触发器组成的15位伪随机码产生电路，然后将输出的伪随机码输入搭设好的编码电路得到CMI编码。
在模拟调制信号产生与解调中，AM信号调制是直接将原信号加上直流分量然后再乘以一个载波来是实现的，其解调的方法是包络检波法。DSB信号的调制与AM相近，只是不加直流分量，解调是采用的相干解调法。对于数字调制信号，3种数字调制信号，均采用了模拟相乘法来进行调制，他们的解调也都是采用了相干解调法。
关键词： 信号源 通信 DTMF 仿真 Multisim Matlab
Design of the Signal Generator Based on Communication System
Abstract Signal generator is an essential equipment applied in communication device, system design, commissioning and maintenance. Designing and implementing a signal generator has many schemes. This design adopts the scheme of hardware design, which has the characteristics of simple structure, low cost, small size, easy to use and strong practicability etc.. In this paper, the study of signal generator lies mainly in the study of basic signal, including common basic signals such as a sinusoidal signal, a pulse signal, a triangular wave signal and a clock signal, the DTMF signal and the CMI code commonly used in a communication system, and the analog modulation signal and a digital modulation signal.
For the generation of common basic signal, we first generate an adjustable sine wave with the RC bridge oscillator. We let it pass through a hysteretic voltage comparator to get a tunable square wave after getting the sine wave. Finally, we let the square wave pass through an integrator to obtain a triangle wave signal. Generating a clock signal is realized by the divider. We can obtain the clock signals of different frequencies when letting a clock signal frequency of 4.096MHz pass through the divider. The DTMF signal is commonly used in communication system. In this paper, we generate and detect the signal with digital method. The continuous time DTMF signal can be got by letting the digital signal pass through the D / A converter. Detection methods used in this paper is the Goertzel algorithm. The generation of CMI code adopts the method of hardware erection. Firstly, we erect a 15-bit pseudo-random code generator circuit by four D flip-flops. Then we can let the exporting pseudo-random code pass through the encoding circuit to get the CMI code.
In terms of the generation and demodulation of an analog modulated signal, AM modulation signal can be achieved by coupling directly to the DC component of the original signal and then being multiplied by a carrier, which can be demodulated with envelope detector method. DSB modulation and AM modulation signal is analogous, but the former don’t contain a DC component, and the demodulation method is coherent demodulation. For digital modulation signals, three kinds of digital modulation signals are used to modulate the analog multiplication, they are also demodulated by coherent demodulation.
Key words: Signal generator Signal communication DTMF Simulation Multisim Matlab
目 录
第一章 绪 论 1
1.1 信号源综述 1
1.1.1 信号源简介 1
1.1.2 信号源发展的现状、水平和趋势 1
1.2 课题的研究意义 2
1.3 信号源设计方案现状 3
1.4 仿真软件概述 3
1.4.1 NI Multisim 概述 3
1.4.2 Matlab概述 4
第二章 常用的基础信号 5
2.1 常用信号信号总电路的设计 5
2.2 正弦波的产生 7
2.2.1 RC桥式正弦波振荡器电路构成 7
2.2.2 RC桥式振荡器的稳幅过程 8
2.2.3 RC桥式正弦振荡电路的设计与仿真 8
2.3 脉冲波的产生 10
2.3.1 脉冲波产生原理 10
2.3.2 脉冲波设计与仿真 11
2.4 三角波的产生 12
2.5 时钟信号的产生 13
2.5.1 时钟信号总电路设计 13
2.5.2 时钟信号电路仿真 14
第三章 通信系统中常用的信号 19
3.1 信令简介 19
3.1.1 信令的概念 19
3.1.2 用户终端发出的信令 19
3.1.3 交换机发出的信令 20
3.2 双音多频信号 20
3.2.1 DTMF信号原理 20
3.2.2 DTMF信号的产生 20
3.2.3 DTMF信号的检测 21
3.2.4 Matlab仿真程序分析 22
3.3 CMI码 24
3.3.1 CMI简要介绍 24
3.3.2 伪随机码发生器电路设计 24
3.3.3 CMI编码电路设计 25
3.3.4 CMI解码电路设计 28
第四章 模拟调制信号 30
4.1 调幅（AM） 30
4.1.1 AM调制原理 30
4.1.2 AM解调原理（包络检波） 30-b..
