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MAGIC COMMUNICATION
DEFINITION OF 4G
4G is the 4th Generation of standards for mobile phones and mobile telecommunications
INTRODUCTION
Fourth generation is the “next” generation of technology that will be used by cellular phone companies, making it possible to deliver superior quality video and data, in addition to voice.
voice.4G Wireless was originally conceived of by the Defense Advanced Research Projects Agency (DRAPA) in US, the same organization that developed the wired internet.
The data transfer rate is expected to be in the range of 20 to 100 Mbps in 4G networks, which will be 10
to 50 times those offered by 3G links. 4G will reliable wireless subscribers to view high
definition television programming through wireless broadband connections
HISTORY OF 4G
It is a successor to the 3G and 2G families of standards.
to solve still-remaining problems of 3G
SERVICE EVOLUTION
comprehensive and secure IP based mobile broadband solution to laptop computer wireless modems, smart phones, and other mobile devices.
variety of new services fast response, high capacity, low user charges,
OFDMA(ORTHOGONAL FREQ. DIVISION MULTIPLEXING).
The signal is split into orthogonal subcarriers, on each of which the signal is “narrowband” (a few kHz)
it is immune to multipath effect
It is flexibility for resource allocation of radio link usage.
OFDM also provides a frequency diversity gain, improving the physical layer performance
OFDM
SDR(SOFTWARE DEFINED RADIO).
Several infrastructural gains are expected from SDR.
Ex: to increase the n/w capacity at a specific
time(during a sport event).an operator has to reconfigure its n/w by adding several modems at BTS.
SDR makes this reconfiguration easy.
MIMO(MULTIPLE INPUT MULTIPLE OUTPUT)
Mimo uses signal multiplexing between multiple transmitting antenna&recievers
Using OFDMA signal transmitted by M antennas is recieved by N antennas
MIMO is more effecient when many multi path signals are recieved
Handover and mobility is more flexible in OFDMA than in CDMA
INTERLAYER OPTIMIZATION Interlayer optimization The most obvious interaction is the one between
MIMO and the MAC layer. Other interactions have been identified (see Figure7).
HANDOVER AND MOBILITY
HANDOVER TECHNOLOGY IS BASED ON MOBILE IP TECHNOLOGY
IN SINGLE FREQUENCY NETWORKS IT IS NECESSARY TO RECONSIDER THE HANDOVER METHODS
SEVERAL TECHNIQUES AN BE USED WHEN CARRIER TO INTERFERENCE RATIO IS NEGATIVE BUT DRAWBACK OF THIS TECHNIQUES IS CAPACITY
THE ALTERNATE IS TO USE MACRO DIVERSITY PROCESSING
CACHING AND PICOCELL
In pico cellular coverage highdata rate services can be delivered even the reception or transmission is interrupted for few seconds
Advantages of coverage esspecially when designed with caching technology is high spectrum efficiency ,highscalability(50to500 bit/s/hz),highcapacity and and low cost
MULTIPLE
PICO CELL NET WORK DESIGN
COVERAGE Coverage the density is achieved by
adding new technologies and progressively enhancing density
Wimax deployment is taken as example Parent coverage performance may
vary from 1 to 20 bits/s/hz/km while pico cell
may achieve from 100 to 500 bit/s/hz/km
FUTURE APPLICATIONS
SENSORS ON PUBLIC VEHICLES
CAMERAS IN TRAFFIC LIGHTS
VIRTUAL NAVIGATION
TELE MEDICINE
TRAFFIC CONTROL DURING DISASTERS
CONCLUSION
As the history of mobile communications shows, attempts have been made to reduce a number of technologies to a single global standard. Projected 4G systems offer this promise of a standard that can be embraced worldwide through its key concept of integration.
QUERIES
THANK U
PRESENTED BY T.KALYAN & B.M.K.M RAGHAVENDRA