Abstract
3G is the "3rdGeneration" (third generation) of the acronym, that is, the third
generation mobile communication system (IMT-2000), it is the high-speed mobile data
network communications industry terminology. Narrowly speaking, 3G refers to the
International Telecommunication Union (ITU) to determine the three major wireless
interface standard: W-CDMA (Broadband Code Division Multiple Access), CDMA2000
(multi-wavelength division multiplexing spread spectrum modulation is contained),
and TDS-CDMA ( Time Division Synchronous Code Division Multiple Access).
Throughout the history of mobile communication systems, analog mobile phones known
as the "first generation"; digital mobile phones included in the "second generation";
and the subsequent development of technology is called "third generation." At
present there are a variety of the world's first-and second-generation communication
systems, they become the worldwide popularity of a single communication terminal
equipment, a resistance, 3G technology, the production is inevitable. The design
is based on 3G technology to support a full range of mobile multimedia systems, which
provide flexible data rates for a variety of support, not only can send voice data,
it can handle images, music, video streaming and other forms of media services
including web browsing, conference calls, e-commerce and other information services.
In order to provide this service, wireless network must be able to support different
data transfer rate, ie indoor, outdoor, and driving environment to each support at
least 2Mbps (megabytes / second), 384kbps (kilobytes / per seconds), and the
transmission speed of 144kbps.
Compared with the previous two generations of mobile communication technology, 3G
data transfer rate greatly increased, which can become a 3G wireless mobile
value-added services to provide more important prerequisite. In e-commerce
applications, 3G technology enables logistics and distribution, mobile payment has
become faster and more convenient, plus a range of security technology, security,
e-business to greater development. Of course, at this stage, 3G technology and do
