28-12-2012, 05:08 PM
4G wireless technology
[attachment=45644]
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.
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.
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.
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.
[attachment=45644]
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.
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.
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.
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.