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8/2/2019 4G Wireless Presentation
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4G-WIRELESS NETWORKS
PREPARED BY:
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Evolution of Wireless
Networks:
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3
REVOLUTION
in WirelessCommunication
Firstimplemented In
1980s
Mobility In TeleCommunicatio
n
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Limitations:
Subscriber CapacitySecuritySpectrum Utilization Infrastructure Changes
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RevolutionaryStep TowardDIGITAL
Implemented
in 1990s
Manyadvantages
Over 1G
Still inMarket
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Enhancement Over 1G:
Increased capacityReduced capital cost
Reduced Cellular Fraud
Improved Features
SMS
Voice & Data Transmission
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First
Implemented in 2000Provides
higher datarates
Offers
always-oninternet ande-mail
Typicallyuses GPRS
Bridgebetween 2 G
& 3 G
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Enhancement Over 2G:
High speed packet-dataservice(144.4kbps)
Uses existing radio spectrum
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What 3G & 4G CanDo?
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Implementedin 2005
Consistingof Packet
DataDevices
HigherSpeed than
2.5G &2.75G
VideoConferenci
ng
InternetStreaming
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Standards:-
UMTS: High data rate-up to 2Mbps
Deliver information directly tousers and provide them withaccess to new and innovativeservices & applications.
Provides personalcommunication to massmarket regardless of location,network & terminal used.
Requires,
Multi-media
Multi-environment Multi-operators- Virtualoperators
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TD-CDMA: Combination of
TDMA,CDMA & FDMA.
5Mhz Bandwidth
Supports asymmetric
traffic such as IP
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Enhancement Over 2.5G:
Global StandardCompatibility within different networks
High quality
Worldwide common frequency bandWorldwide roaming capability
Multimedia applications
High speed packet data rates 2Mbps for Fixed
384 Kbps for Pedestrian
144 Kbps for Vehicle
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Objectives:
High network capacity : more simultaneoususers per cell,
A data rate of at least 100 Mbps betweenany two points in the world,
Smooth Handoff across heterogeneousnetwork Seamless connectivity and global roaming
across multiple networks, High quality of service for next generation
multimedia support (real time audio, highspeed data, HDTV video content, mobileTV, etc),
Interoperability with existing wireless
standards.
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Challenges To 4G:To Provide lower Expenditure cost and
Capital CostTo Support Wide variety of spectrum
band
To Develop cost effective HighPerformance Cell Site
To Provide more Bandwidth atbackhaul portion of network
To Support Voice over InternetProtocol (VoIP) application
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Technologies:
NewBase Station TechnologyAdvance Antenna design , integration
strategies & configuration
Novel Backhaul methodAdvance DSP techniques
Solution for Multihop relay
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Conceptual View 4G:
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Proposed Architecture of 4G:
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OFDM
Multi carriermodulation
Divides Band B into
N subcarrierParallel bit streams
B/N Apart
Subcarrier sum upbeforeTransmission
Coding, Decoding
data through IP20
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Smart Antennas-MIMO:
Smartness at bothtransmitter &receiver
Employs SDMA
Multiple parallelchannels operatingsimultaneously onsame Band of freq.
Combined withadaptive Coding &Decoding
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Wh t i Wi Fi?
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What is Wi-Fi?Wireless Fidelity
Any type of 802.11 network whether
802.11b,802.11a,802.11g,dual-band etc.Uses RF to transmit Data through Air
What can you do with it?Quick/easy network access
Staff access to corporate network
Patron internet access(hotspot) Interconnecting two network
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What is Wi-MAX? Worldwide Interoperability for Microwave Access, Broadband wirelessaccess(BWA) technique Offers broadband connection over long distance Any type of 802.16 network.
What can you do with it? Connecting Wi-Fi hotspots to the Internet. Providing data and telecommunications services. Providing a source of Internet connectivity as
part of a business continuity plan. Providing portable connectivity.
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Comparison Of Wi-Fi & Wi-MAX
Wi-MAX Wi-Fi
WiMAX uses is a longrange system,
WiMAX uses licensed orunlicensed spectrum.
Wi-MAX is less interactivewith end user devices.
WiMAX uses a mechanismbased on connectionsbetween the base stationand the user device.
WiMAX runs a connection-
oriented MAC.
WiFi is limited to short rangeCells
Wi-Fi uses unlicensedspectrum to provide access toa network.
Wi-Fi is more popular in enduser devices.
Wi-Fi has a QoS mechanismsimilar to fixed Ethernet,where packets can receivedifferent priorities based ontheir tags. For example VoIP
Wi-Fi runs on the MediaAccess Control's CSMA/CAprotocol.
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Conclusion:
Next Generation(4G) network is abroadband packet network & requiresGiga-bit wireless technology of ~1Gbpscapability.
Killer Application: Wireless visualcommunication? There are many interesting & Important
research topics before the born of 4G
wireless systems: Gigabit wireless technology : Broadband
CDMA, Hybrid ARQ, MIMO High efficient video coding technique Multihop technique in cellular system
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THANK YOU