外文翻译--3g技术-学位论文.doc
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1、 外文资料翻译学 院: 电子工程学院 系(专业): 电子信息工程 班 级: 电子061 姓 名: 学 号:指导教师评语: 签名: 年 月 日一:外文原文3G TECHNOLOGYAlthough the technology behind 3G may seem complicated, the ways in which 3G will affect all of our lives are easy to imagine. Just imagine having a combined camera, videocamera, computer, stereo, and radio incl
2、uded in your mobile phone. Rich-media information and entertainment will be at your fingertips whenever you want anywhere there is a wireless network. Mobile communication is moving from simple voice to rich media, where we use more of our senses to intensify our experiences. But not all of this wil
3、l happen at once. 3G is an evolution to a communications ideal that no one completely understands yet. What we do know is that mobile multimedia will hit the Japanese markets in 2001, and Europe and North America will follow soon after. 3G brings together high-speed radio access and IP-based service
4、s into one, powerful environment. The step towards IP is vital. IP is packet-based, which in simple terms, means users can be on line at all times, but without having to pay until we actually send or receive data. The connectionless nature of IP also makes access a lot faster: file downloads can tak
5、e a few seconds and we can be connected to our corporate network with a single click. 3G introduces wideband radio communications, with access speeds of up to 2Mbit/s. Compared with todays mobile networks, 3G will significantly boost network capacity - so operators will be able to support more users
6、, as well as offer more sophisticated services. 3G - At home3G is going to affect our home and social lives in many ways. The services that 3G enables will help us to manage our personal information, simplify tasks such as grocery shopping, make better use of our time and offer services that are jus
7、t fun to use. Operators will be able to develop myriad new service opportunities to attract and retain new customers. Here are some examples: Youre sitting on a train and use this dead time to log on to your bank account, check your balance and pay a few bills - all through your 3G device. You save
8、time and can be smarter about managing your finances. On a touring vacation, you arrive in a new city. You havent made any reservations in advance, because you can do this when you get there, by using your 3G handset to obtain up-to-date information, including hotel vacancies. Having booked a room,
9、you can use your mobile to view video clips of local tourist attractions and talk to someone from the local tourist information bureau at the same time. 3G - At work3G will not just support the needs of businesspeople who travel a lot, but will also help new, flexible working practices, such as home
10、-working and remote access to corporate networks outside traditional working hours. Businesspeople are often high-volume airtime users, so they represent a big opportunity for mobile operators. Here are some examples: At work you receive a message from your smart refrigerator at home. The message te
11、lls you that certain items need restocking and an order has already been prepared for the local grocery store, which you can approve, so that your groceries are ready to collect on the way home. You are on the road, and urgently need to discuss a draft presentation with a number of colleagues back i
12、n the office. Pulling into a service station, you use your 3G device to hold a telemeeting with your colleagues and, at the same time, you can all view the draft presentation and make changes on line. A maintenance engineer is repairing some equipment on a clients premises and hits a problem. Using
13、his 3G device, he contacts his department and downloads a demonstration video that guides him through the repair process. TECHNOLOGY 3G brings together two powerful forces: wideband radio communications and IP-based services. Together, these lay the groundwork for advanced Mobile Internet services,
14、including personalized portals, infotainment, mobile commerce and unified messaging -encompassing high-speed data, superior quality voice and video and location-based services. Making 3G a reality depends on technology developments in different areas. These include amendments to the radio interface
15、to support wideband communications and in the core network. Supporting technologies, such as WAP and Bluetooth, also have an important role to play. This section provides a brief overview of some of the main technologies and developments involved. Ericsson supports all of these technologies and has
16、played an active role in their development. GPRSGeneral Packet Radio Service (GPRS) is an enhancement to existing GSM and TDMA networks that introduces packet data transmission, enabling always on mobility. This means that users can choose to be permanently logged on to e-mail, Internet access and o
17、ther services, but do not have to pay for these services unless sending or receiving information. When EDGE is added to GPRS, these data rates will increase up to 384kbit/s. GPRS will be implemented by adding new packet data nodes and upgrading existing nodes to provide a routing path for packet dat
18、a between the mobile terminal and a gateway node. The gateway node will provide interworking with external packet data networks for access to the Internet and intranets. Benefits: Faster data speeds and always on mobility Almost instantaneous connection set-up Connection to an abundance of data sour
19、ces around the world, through support for multiple protocols, including IP A step towards full 3G services. WCDMAWideband Code Division Multiple Access (WCDMA) is a wideband radio technique that provides far higher data rates than other radio techniques available today, up to 2Mbit/s, and highly eff
20、icient use of radio spectrum. The higher bandwidth that WCDMA provides will deliver the full potential of 3G. For example, WCDMA allows simultaneous access to several voice, video and data services at once. WCDMA is fully compliant with IMT-2000 and is the air interface technology for standards in t
21、he 2GHz bandwidth (the IMT-2000 core band), known as UMTS (Universal Mobile Telecommunication System) in Europe and ARIB (Association of Radio Industry Businesses) in Japan. Ericsson has been at the forefront of WCDMA development. The company delivered an experimental WCDMA system to NTT DoCoMo in J
22、apan back in 1998. Ericsson has also set up WCDMA test systems around the world. At 2000, Ericsson announced its first family of WCDMA base stations. EDGEEnhanced Data Rates for Global Evolution (EDGE) enables GSM and TDMA operators to offer 3G services using existing network frequencies. By making
23、changes and additions to standardization of evolutionary phases of the air interface and the backbone networks, as well as the migration to ALL-IP and multimedia networks. cdma2000cdma2000 is a decidedly efficient 3G standard for the delivery of high bandwidth data and high capacity voice services.
24、The evolution of the cdma2000 standard will enable mobile systems to offer data throughputs of 2 Mbit/sec and beyond. The higher bandwidth that cdma2000 provides will deliver the full potential of 3G. For example, cdma2000 also allows simultaneous access to several voice, video and data services at
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