4G Wireless Presentation

8/2/2019 4G Wireless Presentation

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4G-WIRELESS NETWORKS

PREPARED BY:


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Evolution of Wireless

Networks:

2


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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

4
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5

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

8


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`

What 3G & 4G CanDo?
http://../VIDEOShttp://../VIDEOShttp://../VIDEOShttp://../VIDEOShttp://../VIDEOS


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10

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
http://../WORD/5g_fet.docxhttp://../WORD/5g_fet.docx


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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

4G Wireless Presentation

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