【正文】 沈陽(yáng)理工大學(xué)學(xué)士學(xué)位論文 I 摘 要 通信系統(tǒng)的設(shè)計(jì)、 實(shí) 驗(yàn)過程中，通信信號(hào)仿真具有靈活性好、經(jīng)濟(jì)等諸多優(yōu)點(diǎn)，為通信系統(tǒng)研究工作帶來了極大的方便。本通信仿真平臺(tái)的任務(wù)是對(duì)調(diào)幅、雙邊帶、單邊帶、調(diào)頻、調(diào)相五種模擬通信信號(hào)的調(diào)制和解調(diào)進(jìn)行建模和計(jì)算 ，以及 對(duì) 2ASK， 2FSK，2PSK， 2DPSK 四種數(shù)字通信信號(hào)的調(diào)制和解調(diào)進(jìn)行建模和計(jì)算。該仿真平臺(tái)實(shí)現(xiàn)了不同設(shè)計(jì)參數(shù)下各個(gè)信號(hào)的時(shí)域和頻域圖形的繪制，從而很好的為教學(xué)提供了幫助。通信仿真充分考慮了調(diào)制樣式和噪聲大小以及在調(diào)制過程中的各種參數(shù)對(duì)通信信號(hào)性能的影響，完成了對(duì) 模擬以及數(shù)字 信號(hào)建模計(jì)算 ，得到了時(shí)域波形和頻譜，能夠直觀的顯示各種參數(shù)對(duì)各種調(diào)制樣式的通信的影響。 本文做了以下工作：以 MATLAB 為工具，主要應(yīng)用 MATLAB 中的 GUI（圖形用戶接口）程序設(shè)計(jì)，設(shè)計(jì)實(shí)現(xiàn)了一個(gè)通信平臺(tái)，能模擬 九 種調(diào)制信號(hào)的產(chǎn)生，傳輸以及解調(diào)接收，實(shí)現(xiàn)了在平臺(tái)上進(jìn)行參數(shù)輸入和圖形輸出的交互功能。 關(guān)鍵詞 ： 調(diào)制；解調(diào)；仿真； MATLAB； GUI 沈陽(yáng)理工大學(xué)學(xué)士學(xué)位論文 II Abstract In the design and test of the munication system, municating signal simulation possesses many advantages, such as good flexibilities, economy . And it takes great convenience to the research of munication system. The target of the munication system flat is modeling and calculating to modulation and demodulation of five kinds of signals: AM,DSB,SSB,FM, task of the munication simulation platform for modeling and calculation of 2ASK, 2FSK, 2PSK, 2DPSK four digital munications signal modulation and demodulation. The simulation platform realized the drawing of time domain graphics and frequency domain graphics to the different design parameters of each signal .Communicating simulation considers the effects of modulation mode, noise level and modulating parameters to munication, modeling calculation, creation of the four time periods waveform and spectrum deeply and widely. It’s convenient to display intuitionisticly the effects of parameters to modulation modes. This paper made the following job: by using MATLAB, mainly using the tool of the MATLAB graphical user interface (GUI) program design, designed a munication platform, which can simulate the eight kinds of modulation signal’s generation, transmission and demodulation and realized the input of the parameters and the output of the graphics. Keywords: modulation。 demodulation 。 simulation。 MATLAB。 GUI 沈陽(yáng)理工大學(xué)學(xué)士學(xué)位論文 III 目 錄 1 緒 論 .................................................................................................................................... 1 2 模擬通信系統(tǒng)基礎(chǔ)理論 ...................................................................................................... 3 模擬通信系統(tǒng)概述 .................................................................................................... 3 模擬通信系統(tǒng)中的線性調(diào)制 .................................................................................... 4 普通幅度調(diào)制（ AM） .................................................................................... 4 雙邊帶幅度調(diào)制（ DSB） .............................................................................. 8 單邊帶調(diào)制（ SSB） ..................................................................................... 10 模擬通信系統(tǒng)中的非線性調(diào)制 .............................................................................. 13 頻率調(diào)制（ FM） .......................................................................................... 13 相位調(diào)制（ PM） .......................................................................................... 16 3 數(shù)字通信系統(tǒng)基礎(chǔ)理論 .................................................................................................... 17 數(shù)字通信系統(tǒng)概述 .................................................................................................. 17 數(shù)字通信系統(tǒng)調(diào)制解調(diào)原理 .................................................................................. 18 二進(jìn)制幅度鍵控 (2ASK)................................................................................ 18 二進(jìn)制頻移鍵控 (2FSK) ................................................................................ 21 二進(jìn)制相移鍵控 (2PSK) ................................................................................ 23 二進(jìn)制 差分 相移鍵控 (2DPSK) ..................................................................... 26 4 模擬通信系統(tǒng)仿真平臺(tái)總體設(shè)計(jì) .................................................................................... 28 模擬通信系統(tǒng)仿真平臺(tái)的功能 .............................................................................. 28 系統(tǒng)總體設(shè)計(jì) .......................................................................................................... 28 總體設(shè)計(jì)參數(shù) .......................................................................................................... 29 模擬通信系統(tǒng)仿真實(shí)現(xiàn) .......................................................................................... 30 信號(hào)調(diào)制解調(diào)程序流程圖 ............................................................................ 30 普通調(diào)幅（ AM）信號(hào)仿真 .......................................................................... 31 雙邊帶調(diào)幅（ DSB）信號(hào)仿真 .................................................................... 33 單邊帶調(diào)幅（ SSB）信號(hào)仿真 ..................................................................... 35 調(diào)頻（ FM）信號(hào)仿真 .................................................................................. 37 調(diào)相（ PM）信號(hào)仿真 .................................................................................. 39 仿真結(jié)果分析 .......................................................................................................... 41 沈陽(yáng)理工大學(xué)學(xué)士學(xué)位論文 IV 5 數(shù)字通信系統(tǒng)仿真實(shí)現(xiàn) .................................................................................................... 42 仿真平臺(tái)功能 .......................................................................................................... 42 總體設(shè)計(jì)方案 .......................................................................................................... 42 總體設(shè)計(jì)參數(shù) .......................................................................................................... 43 仿真實(shí)現(xiàn) .................................................................................................................. 44 信號(hào)調(diào)制解調(diào)程序流程圖 ............................................................................ 44 二進(jìn)制幅度鍵控 (2ASK)信號(hào)仿真 ........................