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Presented By: Suresh Kumar.V

The document discusses the evolution of wireless generations from 1G to 4G. 4G aims to provide high-speed internet access and multimedia services through technologies like OFDM, MIMO, and software defined radio. It will support IP services and IPv6, offer high data rates up to 100 Mbps, and allow seamless integration of services. Key 4G standards include WiMAX and LTE. 4G networks are expected to deliver improved quality of service for applications like video calling, mobile TV, and online gaming.

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358 views16 pages

Presented By: Suresh Kumar.V

The document discusses the evolution of wireless generations from 1G to 4G. 4G aims to provide high-speed internet access and multimedia services through technologies like OFDM, MIMO, and software defined radio. It will support IP services and IPv6, offer high data rates up to 100 Mbps, and allow seamless integration of services. Key 4G standards include WiMAX and LTE. 4G networks are expected to deliver improved quality of service for applications like video calling, mobile TV, and online gaming.

Uploaded by

surivsk
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PPT, PDF, TXT or read online on Scribd
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WIRELESS SYSTEM

Presented By:
SURESH KUMAR.V
A BRIEF VIEW
 Generation refers change in nature of Service compatible transmission
technology and new frequency bands.

 1G systems used analog frequency modulation.

 2G systems use digital communication techniques with TDM, FDM.

 3G systems offer higher data rates and voice and paging services to
provide interactive multimedia including teleconferencing and
internet access, by using CDMA.

 4G aims to provide IP telephony, ultra-broadband Internet access,


gaming services.
WHAT IS 4G ???
 4G refers to the fourth generation of cellular wireless standards

 4G is a packet switched wireless system with wide area coverage and


high throughput.

 4G wireless uses OFDM and millimeter wireless that enables data rate
of 100 mbps and frequency band of 2-8 GHz.

 4G is going to be a packed based network.

 4G provide an end-to-end IP solution where voice and data is going


to be served to users.
OBJETIVES OF 4G
 4G being developed to accommodate QoS rate requirements
set by further development of existing 3G applications.

 Flexible channel bandwidth between 5 and 20MHz, optionally


up to 40MHz.

 Data rate of at list 100Mb/s between any two points in the


world.

 Increase system spectral efficiency, to 3bit/s/Hz/cell in the


downlink and 2.25bit/s/Hz/cell for indoor usage.
3G Vs 4G
The following table shows comparisons between
3G and possible 4G systems.
  3G    4G

Frequency Band 1.8 - 2.5 GHz 2 - 8 GHz


Bandwidth  5-20 MHz 5-20 MHz
Data rate Up to 2Mbps Up to 100 Mbps
 Access  Wideband CDMA  Multi-carrier -
CDMA  or
OFDM(TDMA)
Switching  Circuit/Packet  Packet
Network   Wide area   Hybrid network
TECHNOLOGY USED IN 4G
Orthogonal frequency-division multiplexing (OFDM):

•Allows for transfer of more data than other forms of multiplexing


(time, frequency, code, etc).

•Simplifies the design of the transmitter & receiver.

•Allows for use of almost the entire frequency band


–No gaps to prevent interference needed.

•Currently used in WiMax(802.16) and Wi-Fi(802.11a/g).


OFDM…
Technology cont…
Smart Antennas: (MIMO)
There are two types of smart antennas:

Switched Beam Antennas : have fixed beams of transmission, and


can switch from one predefined beam to another when the user with the
phone moves throughout the sector.

Adaptive Array Antennas: 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

Smart antennas can thereby:


• Optimize available power
• Increase base station range and coverage
• Reuse available spectrum
• Increase bandwidth
• Lengthen battery life of wireless devices
Technology cont…
Software Defined Radio(SDR):
4G WIRELESS STANDARD
 WiMAX formed to provide conformance and interoperability of the
IEEE 802.16 standard. It aims to provide wireless data over long
distance from point-to-point link to cellular mobile type access.

 WiBRO a part of IEEE 802.16e in process to provide collaborative


and generic mobile WiMAX.

 3GPP LTE a project aims to improve the mobile phone standard to


cope with future requirements.

 3GPP 2 UMB a project to improve the CDMA2000 mobile phone


standard for next generation applications.
IPv6 SUPPORT
 Unlike 3G, based on two parallel infrastructure circuit switched
and packet switched network nodes, 4G will be based on packet
switching only. This will require low-latency data transmission.

 IPv6 support large number of wireless enabled devices.

 By increasing the number of IP addresses, IPv6 removes the need


for NAT (Network Address Translation).
BENEFITS OF 4G
 High speed, high capacity, and low cost per bit.
 Support interactive multimedia, voice, streaming video,
Internet, and other broadband services.
 Global access, service portability, and scalable mobile
services.
 Better scheduling and call admission control techniques.
 Smooth handoff across heterogeneous networks.
 High quality of service for next generation multimedia support
(real time audio, high speed data, HDTV video content,
mobile TV, etc.)
 Interoperability with existing wireless standards.
APPLICATIONS
 Virtual Presence:4G systems give mobile users a virtual
presence through “Video Conferencing”

 Virtual Navigations: A remote data base contain the graphical


representation of street building and physical characteristics,
blocks of this data is transmitted in rapid sequence to vehicles.

 Tele- Geoprocessing: Queries depending on location


information i.e. GPS

 Mobile portable games:

 Live mobile videos:


CONCLUSION
 Migration to 4G networks ensures convergence of
networks, technologies, applications and services.

 4G can serve as a flexible platform.

 Wireless carriers have an opportunity to shorten


Investment return, improve operating efficiency and
increase revenues.

 4G - a promising Generation of wireless communication


that will change people’s lives.
Reference
 http://www.four-g.net
 http://technology4g.net/

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