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4g

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  • 1.  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.
  • 2.  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.
  • 3.  OFDM UWB Smart antennas IPv6
  • 4.  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.
  • 5.  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.
  • 6.  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 It represent the most advanced smart antenna approach to date using a variety of new signal processing algorithms to locate and track the user, minimize interference, and maximize intended signal reception.
  • 7.  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.
  • 8.  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 .
  • 9.  A software defined radio is one that can be configured to any radio or frequency standard through the use of software. The phone should automatically switch from operating on a CDMA frequency to a TDMA frequency whenever it is required. Roaming can be an issue with different standards, but with a software defined radio, users can just download the interface upon entering new territory, or the software could just download automatically.
  • 10.  In traffic control. location application. Telemedicine. In crisis management application.
  • 11. 4G with its rich features like high speed Wider bandwidth Global mobility and service portablity Packed switched network Tight security revonalize the wireless communication technology.
  • 12. QUERIES “?”

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