本科學生畢業(yè)設計(論文)外文翻譯.doc

吉林化工學院信息與控制工程學院畢業(yè)設計（論文）外文翻譯設計（論文）中文題目：基于Matlab數(shù)字調(diào)制系統(tǒng)仿真English Title：Communication system simulation based on Matlab digital modulation學生學號： 075320213 學生姓名： 曲立南 專業(yè)班級： 電信0702 指導教師： 郝富春 職 稱： 副教授 起止日期：2010.3.12010.3.26 吉 林 化 工 學 院Jilin Institute of Chemical Technology吉林化工學院信息與控制工程學院畢業(yè)設計（論文）外文翻譯1 原文In recent years,our moble communication service swift and violent development,penetrated into social life each aspect,facing the motion user group continually growth and new service emerging one after another incessantly,the mobile communication system must adapt promptly even in advance in the market demand step.But took of a digital modulating technology modulating technique mobile communication system important guarantee.The digital modulation demodulation technolagy holds the extremely important status in the digital communication,the commonly used digital modulation includes:Frequency shift keying(FSK)and phase_shift keying (PSK)and so on.At present has used in the mobile communication system the modulating technology modulating technique being possible to divide into two big kinds:The linear modulating technology and the permanent enveloping modulating technology modulating technique linear modulation techology mainly has:PSK-BPSK、QPSKOQPSK/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 modulatinf technology modulating technique is determined according to the channel characteristic and the application.The power efficiency and the frequency spwcturm effciency cannot be satisfactory to both sides generally uneven America.The high frequency specteum efficiency needs to sacrifice certain power effciency to obtain;Similarly,the high power efficiency also needs to sacrifice certain frequency specteum sfficiency.Along with the modulation technique in the unceasing development, the new modulating technology modulating technique mighe being the better frequency spectrum efficiency and the higher power efficiency.FSK and PSK in the numeral moible communication the find application,in which FSk already obtained the use in the simulation mobile communication digtal signaling.QAM applies in the fixed point-to-point digital microwave system widely,it has the wery high frequency spectrum use factor.But the mobile communication environment regarding the traditional QAM modulation is the serious challenge,but in teaches in the character mobile communication system also to have uses QAM.Exudes Europes numeral mobile communication to use is GMSK modulation,but American and Japans numeral mobile communication uses the QPSK modulating technology modulating technique.The digital modulating technology technique,the GMSK modulation received universal welcome in particular.In recent years as a result of the amplifier design technology progress,realized the modulation method possibly to become.In 1987 the intermediate stage,linear modulation technologies and so on QPSK only then started to be popular.The review mobile communication development course,the modulation demodulation technology and the person-to-person communication mobility as well as the non-slit will cover the multimedia synthesis service demand increasingly to be prominent.The frequency spectrum will extend to the millimeter wave,the sumillimeter wave electromagnetism”the wireless optical fiber”and even the laster and the granule correspondence category wireless correspondence has the increasingly broad active stage and the bright prospects for development.The market is the development driving influence.Although our countrys mobile communication and the Internet development is extremely rapid,but our country at present mobile phone and the network user popular rate very are also low,facing our country 1,300,000,000populations,our country has the very big development space in the network scale and the capacity aspect .At the same time,the competition 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 varuously,the multi-level demands.Therefore,also has the very big development.We 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.譯文近幾年來，移動通信中調(diào)制解調(diào)技術有時在發(fā)展速度和新應用數(shù)目方面，給人非常深刻的印象。隨著社會經(jīng)濟的發(fā)展，調(diào)制技術一直在更新和完善著，與此同時，移動通信走過了第一代移動通信、第二代移動通信并即將進入第三代移動通行。在此之前，調(diào)制技術的發(fā)展在里面起著非常重要的作用。近年來，我們移動通信業(yè)務迅猛發(fā)展，已深入人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與市場需求的步伐。而作為移動通信核心技術之一的數(shù)字解調(diào)技術是實施高速、高校的移動通信系統(tǒng)的重要保證。數(shù)字解調(diào)技術在數(shù)字通信中占有非常重要的地位，常用的數(shù)字解調(diào)有：移頻鍵控（FSK）和移相鍵控（PSK）等。目前以用于移動通信系統(tǒng)的解調(diào)技術可分為兩大類：線性解調(diào)技術和恒包絡調(diào)制技術線性調(diào)制技術主要有：PSK-BPSK、QPSK/4-QPSK、16QAM、64QAM、256QAM，恒包絡調(diào)制技術主要有：MSK TFM GMSK。文章針對三種基本調(diào)制解調(diào)技術及其改進調(diào)制技術進行了詳細的仿真和分析，可見，選擇一種調(diào)制技術是根據(jù)信道特性和應用來確定的。功率效率和頻譜效率一般不能兩全其美。高的頻譜效率要以犧牲一定的功率效率來獲得；同樣，高的功率效率也要犧牲一定的頻譜效率。隨著調(diào)制技術在不斷的發(fā)展，新的調(diào)制技術將可以帶來更好的頻譜效率和更高的功率效率。FSK和PSK已經(jīng)在數(shù)字移動通信中獲得應用，其中FSK早已在模擬移動通信的數(shù)字信令中得到采用。QAM在固定的點對點數(shù)字微波系統(tǒng)中應用較廣泛，它具有很高的頻譜利用率。但是移動通信的環(huán)境對于傳統(tǒng)的Qam調(diào)制是嚴重的挑戰(zhàn)，不過在數(shù)字移動通信系統(tǒng)中也有使用QAM的。泛歐的數(shù)字移動通信采用的是GMSK調(diào)制，而美國和日本的數(shù)字移動通信則采用QPSK調(diào)制技術。在1986年前的國際會議上討論的數(shù)字調(diào)制技術幾乎都集中在上述的恒包網(wǎng)絡調(diào)制技術，尤其是GMSK調(diào)制受到普遍的歡迎。近年來由于放大器設計技術的發(fā)展，實現(xiàn)了調(diào)制方法成為可能。1987年中期，QPSK等線性調(diào)制技術才開始流行起來?；仡櫼苿油ㄐ诺陌l(fā)展歷程，調(diào)制解調(diào)技術和和人通信的移動性以及無縫隙覆蓋多媒體綜合業(yè)務需求將愈來愈突出。頻譜延伸至毫米波、亞毫米波的電磁“午線光纖