4G WIRELESS SYSTEM

4G WIRELESS SYSTEM
INTRODUCTION
Today is the day of internet. In most field wireless system is very widely used.currently a numbers of technology are used with high speed digital wireless system.meanly cellular phone have short range,low band width facility,which is intend to use internet,like 1G,2G,2.5G,3G ETC.the goal is same; long range,high speed,which of the purpose is called as 4G(FOURTH GENERATION).
TOWRD 4G
Mainly wireless comunication is widely used in mo0biles.it may be depend upon generation designation.
. first generation (1G) systems were used primarily for voice communications
. Second generation (2G) wireless communications systems, which is used mainly for voice transmission and reception
. 2.5G is usually identified as being “fueled ” by General Packet Radio Services (GPRS) along with GSM.
.In 3G systems, are designed for voice and paging 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 application).
. Segue to 4G, the “next dimension ” of wireless communication, uses Orthogonal Frequency Division Multiplexing (OFDM), Ultra Wide Radio Band (UWB), Mobile speed will be up to 200km/hr.Frequency band is 2 .8 ghz.
TECHNOLOGY
-IT USES OFDM(ortogonal frequency divisional multiplexing).
-in this Ultra Wide Radio Band (UWB), and Millimeter wireless and smart antenna are used in which Data rate of 20mbps is employed.
-4G uses a multi network functional device software which is very helpful for multiple user.
ADVANTAGES:
o Support for interactive multimedia, voice, streaming video, Internet, and other broadband services
o IP based mobile system
o High speed, high capacity, and low cost per bit
o Global access, service portability, and scalable mobile services
o Seamless switching, and a variety of Quality of Service driven services
o Better scheduling and call admission control techniques
o Ad hoc and multi hop networks (the strict delay requirements of voice make multi hop network service a difficult problem)
o Better spectral efficiency.
DISADVANTAGES
-expensive.
-battery uses is more.
-hard to impliment
-need to complicated hard ware.
CONCLUSION:
ALL totally the best way to help all parties is to use 4G as the next wireless system.and in totally it is safety&secure for public.this the need that demands the solution.today”s wired society is going wireless& it has problem,4G is answer.