调制解调技术中英文翻译资料.docVIP

In the last few years, in the mobile communication modulates the demodulation technology superiority in the development speed and the new application number aspect, for human extremely profound impression.Along with the social economy development, the modulating technology modulating technique renews continuously again and is consummating, at the same time, the mobile communication has passed through the first generation of mobile communication, the second generation of mobile communication and soon enters the third generation mobile、communication.Between this, the modulating technology modulating technique development is playing the extremely vital role in inside.In recent years, our mobile 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 core technologies is the realization high speed, the highly effective mobile communication system important guarantee.The digital modulation demodulation technology 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 modulation technology and the permanent enveloping modulating technology modulating technique linear modulation technology mainly has: PSK-BPSK、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 application.The power efficiency and the frequency spectrum efficiency cannot be satisfactory to both sides generally uneven America.The high frequency spectrum efficiency needs to sacrifice certain power efficiency to obtain; Similarly, the high power efficiency also needs to sacrifice certain frequency spectrum efficiency.Along with the modulation technique in the unceasing development, the new modulating technology modulating technique might bring the better frequency spectrum efficiency and the higher power efficiency. FSK and PSK in the numeral mobile communication the find application, in which FSK already obtained the use in the simulation mobile communication digital signaling.QAM applies in the fixed point-to-point digital microwave system widely, it has the very 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 the GMSK modulation, but American and Japans numeral mobile communication uses the QPSK modulating technology modulating technique.The digital modulating technology modulating technique discussed which in 1986 ago international conference nearly all concentrated in the above permanent enveloping modulating technology modulating 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 submillimeter wave electromagnetism “the wireless optical fiber” and even the laser 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 1,300,000,000 populations, 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 variously, the multi-level demands.Therefore, also has the very big development potential on the mobile communication and the Internet application 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, strengthens the Chinese nation the comprehensive national strength, contributes the strength positively for the global informationization and under the economical globalization environment international society and universes development.4.1 译文近几年来，移动通信中调制解调技术优势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，调制技术一直再更新和完善着，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信。在此之间，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于市场需求的步伐。而作为移动通信核心技术之一的数字调制技术是实现高速、高效的移动通信系统的重要保证。数字调制解调技术在数字通信中占有非常重要的地位，常用的数字调制有：移频键控（FSK）和移相键控（PSK）等。目前已用于移动通信系统的调制技术可分为两大类:线性调制技术和恒包络调制技术线性调制技术主要有: PSK-BPSK、QPSK、OQPSK/ 4-QPSK QAM 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齐美。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