01-01-2011, 04:24 PM
[attachment=7866]
Submitted by
Jitendra nath gouda
Introduction :
A 4G system will be a complete replacement for current networks and be able to provide a comprehensive and secure IP solution where voice, data, and streamed multimedia can be given to users on an "Anytime, Anywhere" basis, and at much higher data rates than previous generations
Problems with the current system
High speed wireless is not available
Not fit for the data transfer
Shortage of bandwidth
Objectives :
Spectrally efficient system
High network capacity
High data rate
Smooth hand off
High quality of service (QoS)
An all IP packet switched network
global roaming
UWB Devices :
It uses frequencies between 3.1 to 10.6 GHz
Provides higher data rate
Uses less power
Passing through objects like sea and layer of rocks
Smart antenna :
Switched beam antenna
Adaptive array antenna
Technologies used in 4G
OFDMA
Software defined Radio
IPv6
Multi input multi output (MIMO)
