调制解调技术中英文翻译资料.doc
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1、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 renew
2、s 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 modula
3、ting 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, t
4、he 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
5、 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 tec
6、hnology 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 modula
7、ting 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 accordin
8、g 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 efficie
9、ncy 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 mobi
10、le 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 r
11、egarding 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
12、 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 particu
13、lar.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 modulat
14、ion 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
15、 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 extre
16、mely 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
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