【正文】 真及結果分析 在第二章中已經(jīng)對數(shù)字調(diào)制的各種方式的原理和過程進行了詳細介紹，本章主要對用 MATLAB 仿真軟件對 2ASK 和 2FSK 的仿真，并對仿真結果進行分析。 Toolboxes 中還提供了用于通信系統(tǒng)分析設計和仿真的專業(yè)化模型庫 CommTbxLibrary。根據(jù)所需仿真的通信系統(tǒng)的數(shù)學模型 (或數(shù)學表達式 )，用戶只要從上述各個模型庫中找出所需的模塊 ,用鼠標器拖到模型窗口中組合在一起 ,并設定好各個模塊參數(shù) , 就可方便地進行動態(tài)仿真 .從輸出模塊可實時看到仿真結果 ,如時域波形圖、頻譜圖等。 （ 2） 參數(shù)設置 建立好模型之后就要設置系統(tǒng)參數(shù)，以達到系統(tǒng)的最佳仿真。 2ASK 的 解調(diào)仿真 2ASK 的解調(diào) 分為相干解調(diào)和非相干解調(diào)法，下面采用相干解調(diào)法對 2ASK 信號進行解調(diào) (1) 建立 simulink 模型方框圖 相干解調(diào)也叫同步解調(diào)，就是用已調(diào)信號恢復出載波 —— 既同步載波。 從 圖 中 可以看出由于載波頻率的提高使的示波器在波形顯示上出現(xiàn)了一定的困難，不過要想顯示調(diào)制部分的理想波形只要調(diào)整示波器的顯示范圍即可。 2FSK 的解調(diào)仿真 對 2FSK 信號的解調(diào)選用相干解調(diào)，為了能方便的解調(diào)出原始信號，選載波f1為 100HZ,振幅為 2；載波 f2 為 300HZ,振幅為 2。 相干解調(diào) 2FSK 系統(tǒng)的抗噪聲性能優(yōu)于非相干的包絡檢測，但需要插入兩個相干載波電路較為復雜。 總 結 本文對數(shù)字調(diào)制解調(diào)技術做了簡單介紹，并對其中的 2ASK、 2FSK 兩種具體方法做了研究。 參考文獻 [1] 樊昌信 .徐炳祥等 .通信原理（第五版） .國防工業(yè)出版社 .2021. [2] 羅新民 .張傳生 .薛少麗 .現(xiàn)代通信原理 ..高等教育出版社 .2021. 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MATLAB語言精要及動態(tài)仿真工具 SIMULINK西安：西北工業(yè)大學出版社， 1998 附 錄 A 外文原文 In the last few years, in the mobile munication modulates the demodulation technology superiority in the development speed and the new application number aspect, for human extremely profound with the social economy development, the modulating technology modulating technique renews continuously again and is consummating, at the same time, the mobile munication has passed through the first generation of mobile munication, the second generation of mobile munication and soon enters the third generation mobile 、 this, the modulating technology modulating technique development is playing the extremely vital role in inside. In recent years, our mobile munication service swift and violent development, perated into social life each aspect, facing the motion user group continually growth and new service emerging one after another incessantly, the mobile munication system must adapt promptly even in advance in the market demand took of a digital modulating technology modulating technique mobile munication core technologies is the realization high speed, the highly effective mobile munication system important digital modulation demodulation technology holds the extremely important status in the digital munication, the monly used digital modulation includes: Frequency shift keying (FSK) and phaseshift keying (PSK) and so on. At present has used in the mobile munication system the modulating technology modulating technique being possible to divide into two big kinds: The linear modulation technology and the permanent enveloping modulating technology modulating technique linear modulation technology mainly has: PSKBPSK、 QPSK OQPSK/4 – QPSK、 QAM、 16QAM、 64QAM、 256QAM .the permanent envelope modulating technology modulating technique mainly has: MSK TFM GMSK. The article in view of the three kind of basicial modulation demodulation technology has carried on the detailed simulation and the analysis, obviously, chooses one kind of modulating technology modulating technique is determined according to the channel characteristic and the power efficiency and the frequency spectrum efficiency cannot be satisfactory to both sides generally uneven high frequency spectrum efficiency needs to sacrifice certain power efficiency to obtain。s mobile munication and the Inter development is extremely rapid, but our country at present mobile phone and the work user popular rate very are also low, facing our country 1,300,000,000 populations, our country has the very big development space in the work scale and the capacity the same time, the petition aspect formation, urges the operation enterprise to develop the new service, the new application positively, provides the rich choice to the user, satisfies the user variously, the multilevel , also has the very big development potential on the mobile munication and the Inter application must promote the wireless domain advance in technology, the technological innovation positively, for the realization rely on science and education to rejuvenate the nation strategy, strengthens the Chinese nation the prehensive national strength, contributes the strength positively for the global informationization and under the economical globalization environment international society and universe39。 近年來，我們移動通信業(yè)務迅猛發(fā)展，已深入到社會生活的各個方面，面對移動用戶群的持續(xù)增長和新業(yè)務的層出不窮，移動通信體系要及時適應甚至超前于市場需求