Definition 4G Wireless Systems
4G Wireless Systems or Fourth generation wireless system
is a packet switched wireless system with
wide area coverage and high throughput. It is designed to be cost effective and
to provide high spectral efficiency . The 4g wireless uses Orthogonal Frequency
Division Multiplexing (OFDM), Ultra Wide Radio Band (UWB),and Millimeter wireless.
Data rate of 20mbps is employed. Mobile speed will be up to 200km/hr.The high
performance is achieved by the use of long term channel prediction, in both time
and frequency, scheduling among users and smart antennas combined with adaptive
modulation and power control. Frequency band is 2-8 GHz. it gives the ability
for world wide roaming to access cell anywhere.
mobile communications systems are uniquely identified by "generation designations.
Introduced in the early 1980s, first generation (1G) systems were marked by analog
frequency modulation and used primarily for voice communications. Second generation
(2G) wireless communications systems, which made their appearance in the late
1980s, were also used mainly for voice transmission and reception The wireless
system in widespread use today goes by the name of 2.5G-an "in between "
service that serves as a stepping stone to 3G. Whereby 2G communications is generally
associated with Global System for Mobile (GSM) service, 2.5G is usually identified
as being "fueled " by General Packet Radio Services (GPRS) along with
GSM. In 3G systems, making their appearance in late 2002 and in 2003, are designed
for voice and paging services, as well as interactive media use such as teleconferencing,
Internet access, and other services. The problem with 3G wireless systems is bandwidth-these
systems provide only WAN coverage ranging from 144 kbps (for vehicle mobility
applications) to 2 Mbps (for indoor static applications). Segue to 4G, the "next
dimension " of wireless communication. The 4g wireless uses Orthogonal Frequency
Division Multiplexing (OFDM), Ultra Wide Radio Band (UWB), and Millimeter wireless
and smart antenna. Data rate of 20mbps is employed. Mobile speed will be up to
200km/hr.Frequency band is 2 ]8 GHz. it gives the ability for world wide
roaming to access cell anywhere.
Features of 4G Wireless Systems:
Support for interactive multimedia, voice, streaming video, Internet, and other
o IP based mobile system
o High speed, high capacity,
and low cost per bit
o Global access, service portability, and scalable mobile
o Seamless switching, and a variety of Quality of Service driven
o Better scheduling and call admission control techniques
hoc and multi hop networks (the strict delay requirements of voice make multi
hop network service a difficult problem)
o Better spectral efficiency
Seamless network of multiple protocols and air interfaces (since 4G will be all ]IP, look for 4G systems to be compatible with all common network technologies,
including802.11, WCDMA, Blue tooth, and Hyper LAN).
o An infrastructure to
handle pre existing 3G systems along with other wireless technologies, some of
which are currently under development.
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