22-06-2012, 04:20 PM
4g wireless technology
4g wireless technology.pptx (Size: 574.65 KB / Downloads: 36)
Introduction
Basically the extension of 3G with more bandwidth and services
Provides fastest speed, data transfer rate upto 100 mbps – 1Gbps
The technologies that fall in the 4G categories are UMTS, OFDM, SDR, TD-SCDMA, MIMO, WiMAX
Will harmonise global roaming , super connectivity and transparent end user performance on every mobile
Requirements for 4G
Based on an all-IP switched network.
Peak data rates according to the ITU requirements.
Dynamic share and use of network resources to support
more simultaneous users per cell.
Scalable channel bandwidth 5 -20 MHz, optionally upto 40 MHz.
Peak link spectral efficiency.
System spectral efficiency.
LTE Advanced standardized by the 3GPP
802.16m standardized by the IEEE (i.e., WiMAX).
Disadvantages of 1G
TDMA less efficient in handling high data rate channels as it requires large guard periods to alleviate the multipath impact.
FDMA consumed more bandwidth to avoid inter carrier interference
2G
Second Generation appeared in 1980.
Digitized the voice signal as well as the control link.
Lower cost, Better Quality and more capacity.
The first commercial network based on TDMA.
Radio signals that require less battery power.
CODEC Introduction.
3G
CDMA – Code Division Multiple Access
Form of Multiplexing
Does not divide up the channel by time or frequency
Encodes data with a special code associated with each channel
Disadvantages of 3G
Suffers from poor spectral flexibility and computationally intensive time domain equalization for whiteband channels.
4g wireless technology.pptx (Size: 574.65 KB / Downloads: 36)
Introduction
Basically the extension of 3G with more bandwidth and services
Provides fastest speed, data transfer rate upto 100 mbps – 1Gbps
The technologies that fall in the 4G categories are UMTS, OFDM, SDR, TD-SCDMA, MIMO, WiMAX
Will harmonise global roaming , super connectivity and transparent end user performance on every mobile
Requirements for 4G
Based on an all-IP switched network.
Peak data rates according to the ITU requirements.
Dynamic share and use of network resources to support
more simultaneous users per cell.
Scalable channel bandwidth 5 -20 MHz, optionally upto 40 MHz.
Peak link spectral efficiency.
System spectral efficiency.
LTE Advanced standardized by the 3GPP
802.16m standardized by the IEEE (i.e., WiMAX).
Disadvantages of 1G
TDMA less efficient in handling high data rate channels as it requires large guard periods to alleviate the multipath impact.
FDMA consumed more bandwidth to avoid inter carrier interference
2G
Second Generation appeared in 1980.
Digitized the voice signal as well as the control link.
Lower cost, Better Quality and more capacity.
The first commercial network based on TDMA.
Radio signals that require less battery power.
CODEC Introduction.
3G
CDMA – Code Division Multiple Access
Form of Multiplexing
Does not divide up the channel by time or frequency
Encodes data with a special code associated with each channel
Disadvantages of 3G
Suffers from poor spectral flexibility and computationally intensive time domain equalization for whiteband channels.