4G WIRELESS TECNOLOGY

4G WIRELESS TECNOLOGY Abstract Today is the day of internet. In most field receiving set system is very widely used. Currently a number of technologies like1G,2G,2. 5G,3G etc A new technology is introduced which is called as 4G technology. Fourth generation wireless system is a packet switched wireless system with wide expanse coverage and high throughput. It is designed to be cost effective and to provide high spectral efficiency. entropy rate of 20mbps is employed.Mobile speed will be up to200km/hr. The high performance is achieved by the use of commodious term channel in both time termchannel in both time and frequency , plan among users and ache antennas combined with adaptive modulation and power control. Frequency band is 2-8 GHz. it gives the ability for world wide roaming to admission cell anywhere. It uses OFDM (ortogonal frequency divisional multiplexing) and Ultra Wide Radio Band(UWB), and Millimeter wireless and smart antenna. G uses a multi network functional devic e software which is very helpful for multiple user. Advantages -support for interactive multimedia, voice, be adrift video, Internet, and other broadband services -IP based mobile system-High speed, high capacity, and low cost per bit. -global access, service portability, and climbable mobile services -Seamless switching and a variety of Quality of -Better spectral efficiency.Service driven services. Better scheduling and call admission control techniques Disadvantages -Expensive and hard to implement -bettery usage is more -needs complex hardware closedown There is a need for next generation of wireless technology i. e. 4G which will be a platform for seamless technology providing widespread coverage ,band width and power consumption with higher info rates . .