1、 中文 3041 字 毕 业 设 计（论 文） 外 文 参 考 资 料 及 译 文 译文题目： 移动通信 3G 技术 学生姓名： 学 号： 专 业： M11 通信工程 （专转本） 所在学院： 指导教师： 职 称 ： 实验师 Discussion on 3G technology of mobile communications analysis June 2, 2008, China Telecom, China Unicom and China Netcom H-share companies issued notice to announce the details of the rest
2、ructuring of telecommunications at a time, the operators from the May 23 due to the restructuring of telecommunications suspension just the past six and a half trading day. With the determination of the telecom restructuring plan: China Mobile Railcom = China Mobile, China Unicom, China Telecom (CDM
3、A network) = China Telecom, China Netcom, China Unicom (GSM network) = China Unicom, which the Chinese telecom operators form the three pillars. China Railcom is merged into China Mobile Group in the restructuring of telecommunications, and become a wholly owned subsidiary of China Mobile. So after
4、China Railcom fixed telephone subscribers and broadband subscribers are converted to mobile users in China. Associated with the Luhe reform and restructuring is complete, three 3G licenses will be issued, will be issued three 3G licenses basically three different standard, TD-SCDMA (Time Division Sy
5、nchronous Code Division Multiple Access) is Chinas self-developed 3G standard by the International Telecommunication Union to accept, collectively known as the worlds three mainstream standard of 3G WCDMA (Wideband Code Division Multiple Access) and CDMA2000. According to the telecom industry restru
6、cturing plan, the 3G license issuance: New China Mobile TD-SCDMA license, the new China Telecom CDMA2000 license, China Unicom WCDMA license. 3G third generation mobile communication technology (3rd-generation, 3G), is short for third generation mobile communication technology to support high-speed
7、data transmission of cellular mobile communications technology. 3G services can simultaneously transmit voice and data information, the general rate of more than a few hundred kbps. Representative feature is to provide high-speed data services. Relative first-generation analogue phones (1G) and seco
8、nd-generation GSM, CDMA and other digital mobile phone (2G), third generation (3G) mobile phones generally speaking, is the new generation of wireless communications and Internet multimedia communication The mobile communication system, the future of 3G community website will combine the combination
9、 of WAP and web is a trend, 3G Currently there are four standard: CDMA2000, wcdma, TD-SCDMA, the WiMAX. Also known as WCDMA, called the Wideband the CDMA, also known as CDMA Direct Spread, intended for wideband code division multiple access, which is developed based on the GSM network, 3G technical
10、specifications, wideband CDMA technology in Europe, it is with Japan Wideband CDMA technology is basically the same, and is currently being further integration. W-CDMAs supporters are mainly based on the GSM system based European manufacturers, Japanese companies are also more or less involved, incl
11、uding Europe and the United States, Ericsson, Alcatel, Nokia, Lucent, Nortel, and Japans NTT, Fujitsu, Sharp and other manufacturers. The standard GSM (2G)-GPRS-EDGE-WCDMA (3G) evolution strategy. The system can be set up in the existing GSM network, can be lighter easily transition for system provi
12、ders. Acceptance of the new technology is expected in the GSM system is quite popular in Asia, will be very high. W-CDMA has inherent market advantage. CDMA2000 is also known as narrowband CDMA (CDMA IS95) technology evolved wideband CDMA technology, CDMA Multi-Carrier, it is led by QUALCOMM North A
13、merican companies raised are involved, Motorola, Lucent, and later joined by South Koreas Samsung South Korea is now the leader of the standard. The system is from the the narrowband CDMAOne digital standard derived directly from original CDMAOne structure to upgrade to 3G, the construction cost. Re
14、gion, only Japan, South Korea and North America use CDMA, CDMA2000 supporters than the W-CDMA. However CDMA2000 R & D technology is currently the fastest progress of each standard, many 3G mobile phones have been the first to launch. The standard from CDMA IS95 (2G)-CDMA20001x-CDMA20003x (3G) evolut
15、ion strategy. CDMA20001x is called 2.5 generation mobile communication technology. CDMA20003x CDMA20001x the main difference is that the application of the multi-carrier technology, the bandwidth through the use of three carrier. China Telecom is using this program the transition to 3G, and CDMA IS9
16、5 network has been built. TD-SCDMA Called the Time Division - Synchronous CDMA (Time Division Synchronous CDMA), the standard is the 3G standard developed by the Chinese mainland alone, June 29, 1999, the former Ministry of Posts and Telecommunications Telecommunications Science and Technology Resea
17、rch Institute (Datang Telecom) to ITU technological invention ancestor Siemens, TD-SCDMA has the characteristics of low radiation, known as the Green 3G. The standard intelligent wireless synchronous CDMA software radio technology of todays leading international financial in which the spectrum utilization, business support has the unique advantage of flexibility, frequency flexibility and cost. In addition, due to the huge market of the mainland of China, the standard by the
