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4G TechnologY..

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4G TechnologY..

  1. 1. Prepared By Mr. Chaitanya More Enroll No :1006111
  2. 2. What is 4G?  Abbreviation of fourth generation wireless technology.  It will provide a comprehensive IP solution where voice , data and multimedia can be given to user on an “anytime , anywhere” basis.  It includes several types of broadband wireless communication system access including cellular telephone system.  It will provide seamless mobility and internet access at a rate of 100 Mbps.  The technology is currently available in some countries but it is still being perfected.
  3. 3. History of 4G technology
  4. 4. Features of 4G Technology  Support for multimedia services like teleconferencing and wireless internet.  Wider bandwidths and higher bitrates.  Entirely packet-switched network.  Global mobility and service portability.  Support for previous wireless technologies.  High internet speed.  tight network security.
  5. 5. Technology used in 4G  OFDM  UWB  Smart antennas  IPv6
  6. 6. OFDM (orthogonal frequency division multiplexing)  IT transmits large amounts of digital data over a radio wave.  OFDM works by splitting the radio signal into multiple smaller sub-signals that are then transmitted simultaneously at different frequencies to the receiver .  By inserting a cyclic prefix between adjacent OFDM signal inter signal interference is virtually eliminated if the max. channel delay spread is less than the time interval of cyclic prefix.  In OFDM the subcarrier pulse used for transmission is rectangular.  Here modulation can performed by an IDFT ,which can be generated very efficiently as an IFFT . so, receiver only needs a FFT to reverse this process.
  7. 7. UWB (ultra wide band)  An advanced technology that can be used in 4G technology.  It is typically detected as noise.  It can use any part of the frequency spectrum, which means that it can use frequencies that are currently in use by other radio frequency devices .  It uses a frequency of 3.1 to 10.6 Hz.  It uses less power , since it transmits pulse instead of continuous signal.  Special antennas are needed to tune and aim the signal.
  8. 8. Smart antennas  Smart antenna can be employed to find tune , and turn up signal information.  Smart antenna can send signal back in the same direction that they come from. There are two types of Smart Antennas-  Switched beam antenna:- It has fixed beams of transmission, and switch from predefined beam to another when the user with the phone moves throughout the sector .  Adaptive array antenna :- It represents the most advanced smart antenna approach to data using a variety of new signal processing algorithms to locate and track the user, minimize interference, and maximize intended signal reception.
  9. 9. IPv6  IPv6 means Internet Protocol Version 6 .  The Internet Protocol (IP) is the method or protocol which data is sent from one computer to another on the internet.  Each computer (known as a host) on the Internet has at least one IP that uniquely identifies it from all other computers on the Internet.  It includes128 bits, which is 4 times more than 32bits IP address in IPv4.
  10. 10. QOS (quality of service)  In wireless networks , Quality of Service (QOS) refers to the measure of the performance for a system reflecting its transmission quality and service availability.  4G is expected to have at least a reliability of 99.99%. In 4G QOS may be divided in following ways- Transaction-level QOS describes both the time it takes to complete a transaction and the packet loss rate.  Circuit-level QOS includes call blocking for new as well as existing calls .  User-level QOS depends on user mobility and application type .
  11. 11. Advantages of 4G wireless network :-  Machine-to-machine communication.  Maintain high bandwidth rates while physically moving.  Stay connected to the Internet without any disruption.  Have easier access to services and applications .  Increase the level of user-customizations .  Disadvantages of 4G wireless network :-  Equipment has not been fully developed for network.  Network has more complex security issues.  Network protocols and standardization have not been defined.  Not many areas have 4G service yet.  Very expensive.
  12. 12. Application  Multimedia – video services. High Speed Internet Access.  In traffic control.  Virtual Navigation.  Telemedicine.  Crisis Management. Cameras in traffic light.
  13. 13. Conclusion 4G with its rich features like • High speed • Peak downlink rates of 5 to 10 Mbps • Wider bandwidth • Global mobility and service portability • Packed switched network • Variable bandwidth - 1 to 5 MHz • IP packet data centric • Tight security revitalize the wireless communication technology.

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