數(shù)字調(diào)制系統(tǒng)分析與仿真

摘  要

數(shù)字調(diào)制是通信系統(tǒng)中最為重要的環(huán)節(jié)之一，數(shù)字調(diào)制技術(shù)的改進也是通信系統(tǒng)性能提高的重要途徑。本文首先分析了數(shù)字調(diào)制系統(tǒng)的五種基本調(diào)制解調(diào)方法，然后，運用Matlab及附帶的圖形仿真工具 ——Simulink設(shè)計了這幾種數(shù)字調(diào)制方法的仿真模型。通過仿真，觀察了調(diào)制解調(diào)過程中各環(huán)節(jié)時域和頻域的波形，并結(jié)合這幾種調(diào)制方法的調(diào)制原理，跟蹤分析了各個環(huán)節(jié)對調(diào)制性能的影響及仿真模型的可靠性。最后，在仿真的基礎(chǔ)上分析比較了各種調(diào)制方法的性能，并通過比較仿真模型與理論計算的性能，證明了仿真模型的可行性。另外，本文還利用Matlab的圖形用戶界面（GUI）功能為仿真系統(tǒng)設(shè)計了一個便于操作的人機交互界面，使仿真系統(tǒng)更加完整，操作更加方便。
 
關(guān)鍵詞：數(shù)字調(diào)制；分析與仿真；Matlab；Simulink；GUI圖形界面。

Abstract
  
In this paper, five usual methods of digital modulation are introduced firstly. Then their simulation models are built by using MATLAB’s simulation tool, SIMULINK. Through observing the results of simulation, the factors that affect the capability of the digital modulation system and the reliability of the simulation models are analyzed. And then, the capability of three digital modulation simulation models, 2-FSK, 2-DPSK and MSK, have been compared, as well as comparing the results of simulation and theory. At last, the conclusion is gotten: The simulation models are reasonable. In addition, an operation interface is designed, which can simplify the manipulation of the simulation system, by mean of the Graphical User Interface, which short for GUI.

Keywords:　Digital modulation; analysis; simulation; MATLAB; SIMULINK; GUI

 
目  錄
1 引言………………………………………………………………………1
1.1  數(shù)字調(diào)制的意義  ………………………………………………………1
1.2  Matlab在通信系統(tǒng)仿真中的應用………………………………………1
2 數(shù)字調(diào)制系統(tǒng)的相關(guān)原理  ………………………………………………………2
2.1  2-ASK調(diào)制與解調(diào) ………………………………………………………2
2.2  2-FSK調(diào)制與解調(diào) ………………………………………………………2
2.3  2-PSK調(diào)制與解調(diào) ………………………………………………………3
2.4  多進制調(diào)制與解調(diào)………………………………………………………3
3 數(shù)字調(diào)制系統(tǒng)的仿真設(shè)計…………………………………………………………3
3.1 數(shù)字調(diào)制系統(tǒng)各個環(huán)節(jié)分析 ……………………………………………3
3.1.1   仿真框圖 ……………………………………………………………4
3.1.2   信號源仿真及參數(shù)設(shè)置 ……………………………………………5
3.1.3   調(diào)制解調(diào)模塊 ………………………………………………………5
3.1.4   信道 …………………………………………………………………6
3.1.5   誤碼計算儀 …………………………………………………………6
3.1.6   示波器 ………………………………………………………………6
3.2 仿真模型的設(shè)計及結(jié)果分析 ……………………………………………6
3.2.1  2-ASK …………………………………………………………………6
3.2.2  2-FSK  ………………………………………………………………11
3.2.3  2-DPSK   ………………………………………………………14
3.2.4  2-MSK  ……………………………………………………………16
3.2.5  M-DPSK ……………………………………………………………18
3.3  數(shù)字調(diào)制的性能比較 …………………………………………………21
3.3.1各種調(diào)制模型的性能比較 ……………………………………………21
3.3.2 仿真模型性能與理論性能比較………………………………………22
3.4  GUI用戶界面設(shè)計………………………………………………………23
4 結(jié)束語 ……………………………………………………………………25
致謝  …………………………………………………………………………26
參考文獻……………………………………………………………………27
附錄……………………………………………………………………………………28

摘  要


數(shù)字調(diào)制是通信系統(tǒng)中最為重要的環(huán)節(jié)之一，數(shù)字調(diào)制技術(shù)的改進也是通信系統(tǒng)性能提高的重要途徑。本文首先分析了數(shù)字調(diào)制系統(tǒng)的五種基本調(diào)制解調(diào)方法，然后，運用Matlab及附帶的圖形仿真工具 ——Simulink設(shè)計了這幾種數(shù)字調(diào)制方法的仿真模型。通過仿真，觀察了調(diào)制解調(diào)過程中各環(huán)節(jié)時域和頻域的波形，并結(jié)合這幾種調(diào)制方法的調(diào)制原理，跟蹤分析了各個環(huán)節(jié)對調(diào)制性能的影響及仿真模型的可靠性。最后，在仿真的基礎(chǔ)上分析比較了各種調(diào)制方法的性能，并通過比較仿真模型與理論計算的性能，證明了仿真模型的可行性。另外，本文還利用Matlab的圖形用戶界面（GUI）功能為仿真系統(tǒng)設(shè)計了一個便于操作的人機交互界面，使仿真系統(tǒng)更加完整，操作更加方便。

 

關(guān)鍵詞：數(shù)字調(diào)制；分析與仿真；Matlab；Simulink；GUI圖形界面。




 




Abstract

  

In this paper, five usual methods of digital modulation are introduced firstly. Then their simulation models are built by using MATLAB’s simulation tool, SIMULINK. Through observing the results of simulation, the factors that affect the capability of the digital modulation system and the reliability of the simulation models are analyzed. And then, the capability of three digital modulation simulation models, 2-FSK, 2-DPSK and MSK, have been compared, as well as comparing the results of simulation and theory. At last, the conclusion is gotten: The simulation models are reasonable. In addition, an operation interface is designed, which can simplify the manipulation of the simulation system, by mean of the Graphical User Interface, which short for GUI.


Keywords:　Digital modulation; analysis; simulation; MATLAB; SIMULINK; GUI


 

目  錄

1 引言………………………………………………………………………1

1.1  數(shù)字調(diào)制的意義  ………………………………………………………1

1.2  Matlab在通信系統(tǒng)仿真中的應用………………………………………1

2 數(shù)字調(diào)制系統(tǒng)的相關(guān)原理  ………………………………………………………2

2.1  2-ASK調(diào)制與解調(diào) ………………………………………………………2

2.2  2-FSK調(diào)制與解調(diào) ………………………………………………………2

2.3  2-PSK調(diào)制與解調(diào) ………………………………………………………3

2.4  多進制調(diào)制與解調(diào)………………………………………………………3

3 數(shù)字調(diào)制系統(tǒng)的仿真設(shè)計…………………………………………………………3

3.1 數(shù)字調(diào)制系統(tǒng)各個環(huán)節(jié)分析 ……………………………………………3

3.1.1   仿真框圖 ……………………………………………………………4

3.1.2   信號源仿真及參數(shù)設(shè)置 ……………………………………………5

3.1.3   調(diào)制解調(diào)模塊 ………………………………………………………5

3.1.4   信道 …………………………………………………………………6

3.1.5   誤碼計算儀 …………………………………………………………6

3.1.6   示波器 ………………………………………………………………6

3.2 仿真模型的設(shè)計及結(jié)果分析 ……………………………………………6

3.2.1  2-ASK …………………………………………………………………6

3.2.2  2-FSK  ………………………………………………………………11

3.2.3  2-DPSK   ………………………………………………………14

3.2.4  2-MSK  ……………………………………………………………16

3.2.5  M-DPSK ……………………………………………………………18

3.3  數(shù)字調(diào)制的性能比較 …………………………………………………21

3.3.1各種調(diào)制模型的性能比較 ……………………………………………21

3.3.2 仿真模型性能與理論性能比較………………………………………22

3.4  GUI用戶界面設(shè)計………………………………………………………23

4 結(jié)束語 ……………………………………………………………………25

致謝  …………………………………………………………………………26

參考文獻……………………………………………………………………27

附錄……………………………………………………………………………………28