19-12-2012, 12:55 PM
Seminar on Advanced 4G wireless technology
[attachment=44343]
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.
Why 4G is required?
1.Due to substantial growth in overall number of
subscribers.
2.Due to massive demand of new services like data , audio , image or video .
Features of 4G TECHNOLOGY
Support for multimedia services like teleconferencing and wireless internet.
Wider bandwidths and higher bitrates.
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 .
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.
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.
[attachment=44343]
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.
Why 4G is required?
1.Due to substantial growth in overall number of
subscribers.
2.Due to massive demand of new services like data , audio , image or video .
Features of 4G TECHNOLOGY
Support for multimedia services like teleconferencing and wireless internet.
Wider bandwidths and higher bitrates.
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 .
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.
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.