Tahukah Anda Technology 3G Hari Ini??
Dilulus terbit pada Sunday, January 04 @ 08:28:38 MYT oleh TokPenghulu
Oleh matuse68
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3G(Third Generation Mobile Telephony)
3G
is an ITU(International Telecommunication Union) specification for the
third generation (analog cellular was the first generation, digital PCS
the second) of mobile communications technology.3G promises increased
bandwidth up to 384 Kbps when a device is stationary or moving at
pedestrian speed, 128 Kbps in a car, and 2 Mbps in fixed applications.
Implemented in Europe as UMTS and CDMA2000 in North America, its goals
are high-quality multimedia and advanced global roaming.
WCDMA(Wideband Code Division Multiple Access)
A
3G technology that increases data transmission rates in GSM systems by
using the CDMA air interface instead of TDMA. WCDMA is based on CDMA
and is the technology used in UMTS. WCDMA was adopted as a standard by
the ITU under the name "IMT-2000 direct spread". It has been selected
for the third generation of mobile telephone systems in Europe, Japan
and the United States
UMTS(Universal Mobile Telecommunications System)
Third
generation telecommunications system based on WCDMA-DS. The goal of
UMTS is to enable networks that offer true global roaming and can
support a wide range of voice, data and multimedia services. A
new-generation technology for rapidly moving data and multimedia over
wireless devices. The European implementation of the 3G wireless phone
system, UMTS provides service in the 2GHz band and offers global
roaming and personalized features; designed as an evolutionary system
for GSM network operators, multimedia data rates offered by UMTS are:
vehicular - 144 kbit/s; pedestrian 384 kbit/s; in-building 2Mb/s.
HSDPA(High-Speed DownlinkPacket Access)
HSDPA
is a packet-based data service in WCDMA downlink with data transmission
up to 8-10 Mbps (and 20 Mbps for MIMO systems) over a 5MHz bandwidth in
WCDMA downlink. The high speeds of HSDPA are achieved through
techniques including: 16 Quadrature Amplitude Modulation, variable
error coding, and incremental redundancy. More detail click here...
Telecom News
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