03-04-2012, 10:11 AM
4g wireless technology
4G wireless technology.pptx (Size: 179.72 KB / Downloads: 43)
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 “ anywhere ,anytime” 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 band width 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
4G wireless technology.pptx (Size: 179.72 KB / Downloads: 43)
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 “ anywhere ,anytime” 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 band width 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