本科学生毕业设计(论文)外文翻译.doc

吉林化工学院信息与控制工程学院毕业设计（论文）外文翻译设计（论文）中文题目：基于Matlab数字调制系统仿真English Title：Communication system simulation based on Matlab digital modulation学生学号： 075320213 学生姓名： 曲立南 专业班级： 电信0702 指导教师： 郝富春 职 称： 副教授 起止日期：2010.3.12010.3.26 吉 林 化 工 学 院Jilin Institute of Chemical Technology吉林化工学院信息与控制工程学院毕业设计（论文）外文翻译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.译文近几年来，移动通信中调制解调技术有时在发展速度和新应用数目方面，给人非常深刻的印象。随着社会经济的发展，调制技术一直在更新和完善着，与此同时，移动通信走过了第一代移动通信、第二代移动通信并即将进入第三代移动通行。在此之前，调制技术的发展在里面起着非常重要的作用。近年来，我们移动通信业务迅猛发展，已深入人到社会生活的各个方面，面对移动用户群的持续增长和新业务的层出不穷，移动通信体系要及时适应甚至超前与市场需求的步伐。而作为移动通信核心技术之一的数字解调技术是实施高速、高校的移动通信系统的重要保证。数字解调技术在数字通信中占有非常重要的地位，常用的数字解调有：移频键控（FSK）和移相键控（PSK）等。目前以用于移动通信系统的解调技术可分为两大类：线性解调技术和恒包络调制技术线性调制技术主要有：PSK-BPSK、QPSK/4-QPSK、16QAM、64QAM、256QAM，恒包络调制技术主要有：MSK TFM GMSK。文章针对三种基本调制解调技术及其改进调制技术进行了详细的仿真和分析，可见，选择一种调制技术是根据信道特性和应用来确定的。功率效率和频谱效率一般不能两全其美。高的频谱效率要以牺牲一定的功率效率来获得；同样，高的功率效率也要牺牲一定的频谱效率。随着调制技术在不断的发展，新的调制技术将可以带来更好的频谱效率和更高的功率效率。FSK和PSK已经在数字移动通信中获得应用，其中FSK早已在模拟移动通信的数字信令中得到采用。QAM在固定的点对点数字微波系统中应用较广泛，它具有很高的频谱利用率。但是移动通信的环境对于传统的Qam调制是严重的挑战，不过在数字移动通信系统中也有使用QAM的。泛欧的数字移动通信采用的是GMSK调制，而美国和日本的数字移动通信则采用QPSK调制技术。在1986年前的国际会议上讨论的数字调制技术几乎都集中在上述的恒包网络调制技术，尤其是GMSK调制受到普遍的欢迎。近年来由于放大器设计技术的发展，实现了调制方法成为可能。1987年中期，QPSK等线性调制技术才开始流行起来。回顾移动通信的发展历程，调制解调技术和和人通信的移动性以及无缝隙覆盖多媒体综合业务需求将愈来愈突出。频谱延伸至毫米波、亚毫米波的电磁“午线光纤