【正文】 s and various multirate system, and also can be used for a variety of linear or nonlinear control system design and simulation. It is a powerful tool for dynamic system analysis, including digital signal processing (DSP), analog and digital munication systems, and signal processing system and control system simulation analysis. According to a modular and interactive interface, under the Window in the Windows environment, System View provides users with an embedded analytical engine. System View is a tool of programming for circuit and munication system design, simulation of dynamic analysis. It avoids the plex hardware structures. On the conditions that don’t have the advanced equipment, it also can plete a plex munication system design and simulation. True Software Design System view this thesis, analog modulation and demodulation circuit. By analyzing the input and output waveforms of the correctness of the circuit design. The thesis mainly including an overview of munications systems, analog munications system and the basic contents and use System View, simulation software simulation of munication systems to achieve the simulation. Analog munication systems are the main elements of the basic munication system model, the linear analog signal modulation (AM,DSB,SSB) and demodulator, nonlinear modulation(FM,NBFM) and demodulator, the thesis also give a brief introduction on the simulation software(System View), while using simulation software to achieve the simulation of the munications system simulation. Keywords ： System View Communication Systems Modulation Demodulation Simulation 目 錄 一、緒論 ............................................................... 1 模擬通信系統(tǒng)概述 ............................................... 1 模擬信號(hào)調(diào)制解調(diào) ............................................... 1 調(diào)制的基本概念 ................................................. 2 System View 系統(tǒng)簡(jiǎn)介 ............................................ 3 System View 軟件介紹 .............................................. 3 System View 仿真系統(tǒng)的特點(diǎn) ........................................ 3 二、模擬幅度調(diào)制系統(tǒng) ................................................... 5 幅度調(diào)制基本概念 ............................................... 5 常規(guī)雙邊帶調(diào)幅（ AM） ........................................... 5 AM 的調(diào)制與解調(diào)原理 ............................................... 5 仿真模型及結(jié)果波形圖 ............................................. 7 雙邊帶調(diào)幅（ DSB） .............................................. 10 DSB 的調(diào)制與解調(diào)原理 ............................................ 10 仿真模型及結(jié)果波形圖 ............................................ 11 單邊帶調(diào)幅（ SSB） ............................................. 13 SSB 的調(diào)制與解調(diào)原理 ........................................... 13 仿真模型及結(jié)果波形圖 .......................................... 14 三、模擬角度調(diào)制系統(tǒng) .................................................. 17 角度調(diào)制基本概念 .............................................. 17 頻率調(diào)制（ FM） ................................................ 17 FM 的調(diào)制與解調(diào)原理 ............................................. 17 仿真模型及結(jié)果波形圖 ............................................ 20 仿真結(jié)果分析 .................................................... 23 窄帶調(diào)頻（ NBFM） ............................................... 26 NBFM 的調(diào)制與解調(diào)原理 ............................................ 26 仿真模型及結(jié)果波形圖 ............................................ 28 四、總 結(jié) .......................................................... 31 五、謝 辭 ............................................................ 32 參 考 文 獻(xiàn) ........................................................... 33 1 一、 緒論 模擬通 信系統(tǒng)概述 隨著社會(huì)生產(chǎn)力的發(fā)展，人們對(duì)傳遞消息的要求越來越高，通信，則承載著這個(gè)重要的任務(wù)。 System View 以模塊化和交互式的界面，在 Windows 窗口環(huán)境下，為用戶提供了一個(gè)嵌入式的分析引擎。現(xiàn)代通信系統(tǒng)分為無線通信和有線通信，它在各個(gè)領(lǐng)域發(fā)揮 越來越重要的作用。而通信系統(tǒng)的設(shè)計(jì)需要先進(jìn)行模擬仿真，以提升系統(tǒng)的可用性。 System View 是一個(gè)用于電路與通信系統(tǒng)設(shè) 計(jì)、仿真的動(dòng)態(tài)分析工具，它實(shí)現(xiàn)了功能的軟件化，避開了復(fù)雜的硬件搭建，在不具備先進(jìn)儀器的條件下同樣也能完成復(fù)雜的通信系統(tǒng)設(shè)計(jì)與仿真本文利用 System view 軟件設(shè)計(jì)模擬調(diào)制和解調(diào)電路，通過分析其輸入輸出波形驗(yàn)證所設(shè)