【正文】
種媒體進(jìn)行的信息傳遞,目的是傳輸信息,通信系統(tǒng)是用以完成信息傳輸過程的技術(shù)系統(tǒng)的總稱,作用是將信息從信源發(fā)送到一個或多個目的地。調(diào)制與解調(diào)在信息的傳輸過程中占據(jù)著重要的地位,是不可或缺的,因此研究系統(tǒng)的調(diào)制和解調(diào)過程就極為重要。 本 論 文 首 先 介 紹 了 通 信 系 統(tǒng) 的 概 念 , 進(jìn) 而 引 出 調(diào) 制 和 解 調(diào) , 然 后 介紹 了 我 們 常 用 的 幾 種 調(diào) 制 和 解 調(diào) 的 方 法 。關(guān)鍵詞 通信系統(tǒng);調(diào)制與解調(diào); MATLAB IIISimulation And Design Of Communication Systems Based On MATLABAbstract Communication is through a media for transportation. Communication system which is used to plete the process of information transmission systems ,in general, is to send the information from the source to one or more destinations.Modulation and demodulation occupied an important position in the transmission of information which is essential, so the research about the modulation and demodulation process in the munication system is extremely important. MATLAB is a numerical putation, graphics rendering, image processing and system simulation and other powerful features in one of the scientific puting language, it is a powerful matrix calculation and graphical visualization features and a rich toolbox provides a great convenience for the munication system of modulation and demodulation process. This paper introduces the concept of the munication system, and then leads to modulation and demodulation, and then introduced several of our monly used method of modulation and demodulation. As the power of MATLAB so we introduced the munication system toolbox in the MATLAB. We gives several examples about the munication system based on MATLAB modulation and demodulation and use the software of MATLAB to simulate them.Keywords Communication Systems。 MATLAB IV目錄1 引言 ......................................................................................................12 通信系統(tǒng)的調(diào)制與解調(diào) ......................................................................2 通信系統(tǒng)的概念 ...............................................................................2 調(diào)制和解調(diào)的概念 ...........................................................................4 幅度調(diào)制和相干解調(diào)的原理 ...........................................................53 MATLAB 通信系統(tǒng)工具箱 ................................................................74 基于 MATLAB 的模擬調(diào)制和解調(diào)實例 ...........................................8 用 MATLAB 分析雙邊帶幅度調(diào)制(DSMAM) .......................8 用 MATLAB 分析相干解調(diào)過程 ................................................10總結(jié) ..........................................................................................................12參考文獻(xiàn) ..................................................................................................13致 謝 ......................................................................................................14 11 引言通信按照傳統(tǒng)的理解就是信息的傳輸,在當(dāng)今高度信息化得社會,信息和通信已經(jīng)成為現(xiàn)代社會的“命脈” 。而通信作為傳輸信息的手段或方式,與傳感技術(shù)、計算機技術(shù)相互融合,已經(jīng)成為 21 世紀(jì)國際社會和世界經(jīng)濟發(fā)展的強大推動力,所以未來的通信對人們的生活方式和社會的發(fā)展將會產(chǎn)生更加重大和意義深遠(yuǎn)的影響。對于語音信號來說,相應(yīng)的天線尺寸要在幾十公里以上,實際上不可能實現(xiàn),所以需要經(jīng)過調(diào)制將信號頻譜搬移到較高的頻率范圍,如果不進(jìn)行調(diào)制就把信號直接輻射出去,那么各電臺所發(fā)出信號的頻率就會相同。有時信號過于復(fù)雜,人工計算其調(diào)制和解調(diào)過程較難實現(xiàn),對其結(jié)果