13-01-2011, 02:45 PM
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PRESENTED BY:
VISHWA SHAH
INTRODUCTION
Packet switched wireless system
Next Generation wireless system after 3G.
Drawbacks of 3G That covers in 4G:
Faster Transmission
More Applications
Seamless and Multiplatform
Reliability
Costs
Security
EVOLUTION
1ST GENERATION WIRELESS SYSTEM (In Early 1980)
2ND GENERATION WIRELESS SYSTEM (In Late 1980)
3rd GENERATION WIRELESS SYSTEM (In Late 2002 & In 2003)
4th GENERATION WIRELESS SYSTEM (In 2010)
TECHNOLOGY
OFDM (Orthogonal Frequency Division Multiplexing)
Ultra Wide Radio Band
Millimeter Wireless
Smart Antennas
OFDM
Full Name- Orthogonal Frequency Division Multiplexing
It’s a frequency-division multiplexing (FDM) scheme
utilized as a digital multi-carrier modulation method.
Capability to cancel multipath distortion in a spectrally
efficient manner
Application
ULTRA WIDE RADIO BAND
Advanced transmission technology
The secret is that it is typically detected as noise.
Not cause any interference with current radio
frequency devices
Frequency
Greater Bandwidth
Shaped noise
MILLIMETER WIRELESS
Millimeter-waves are electromagnetic waves.
Frequency
wavelength
Used to ultra high speed data transfer
Their ability is to transfer data using only very small antennas.
SMART ANTENNAS
Employed to help find, tune, and turn up signal information.
It can send signals back in the same direction that they came from.
There are two types of smart antennas:
1. Switched Beam Antennas 2. Adaptive Array Antennas
KEY DRIVERS
A multitude of diverse devices
Predominance of machine-to-machine communications
Location-dependent and e-business applications
The extension of IF protocols to mobility and range of QoS
Privacy and security
Dynamic networking and air-interfaces
Improved coverage mechanisms
Improved and dynamic spectrum usage.
FEATURES
Support for interactive multimedia, voice, streaming video, Internet & other broadband services
IP based mobile system
High speed, high capacity & low cost per bit
Global access, service portability & scalable mobile services
Seamless switching & a variety of QoS driven services
Better scheduling & call admission control techniques
Ad hoc and multi hop networks
Better spectral efficiency
Seamless network of multiple protocols and air interfaces
An infrastructure to handle preexisting 3G systems along with other wireless technologies, some of which are currently under development.
OBJECTIVES
Flexible channel bandwidth- 5 to 20 MHz, optionally up to 40 MHz
Data rate of 100 Mbit/s while the client physically moves at high speeds relative to the station, & 1 Gbit/s while client and station are in relatively fixed positions.
Peak page link spectral efficiency of 15 bit/s/Hz in the downlink, and 6.75 bit/s/Hz in the uplink
System spectral efficiency of up to 3 bit/s/Hz/cell in the downlink & 2.25 bit/s/Hz/cell for indoor usage.
Smooth handoff across heterogeneous networks
Seamless connectivity & global roaming across multiple networks
High quality of service for next generation multimedia support
Interoperability with existing wireless standards and all IP, packet switched network.
Femtocells
APPLICATION
Improved Bandwidth provides opportunities for previously impossible products and services to be released.
At rates of 15-30 Mbit/s, It should be able to provide users with streaming high-definition television.
At rates of 100 Mbit/s, the content of a DVD-5, for example a movie can be downloaded within about 5 minutes for offline access.
CONCLUSION
Consumers demand that software and hardware be user-friendly and perform well.
For example, If the U.S. government wants to help, the best way to help all parties is to enforce 4G wireless system as the next wireless system. The software that consumers desire is already in wide use. The transmission hardware to take it wireless is ready to go.
