R.SRICHARAN R.VENKATA AVINASHR.SRICHARAN R.VENKATA AVINASH 33RDRD B.TECH ECE 3 B.TECH ECE 3RDRD B.TECH ECE B.TECH ECE SITAMS SITAMSSITAMS SITAMS

ContentsContents

EvolutionEvolution 4G Communication4G Communication IntroductionIntroduction StratelliteStratellite ConstructionConstruction Working Working Pros and ConsPros and Cons ServicesServices ApplicationsApplications ConclusionConclusion ReferencesReferences

EVOLUTIONEVOLUTION

Generations of wireless communications:Generations of wireless communications: 1G - FDMA1G - FDMA 2G - TDMA2G - TDMA 3G - CDMA3G - CDMA 4G - OFDM4G - OFDM

Why 4G?Why 4G?

High speed High speed High capacity with low bit costHigh capacity with low bit cost High capacity with reasonable frequency bandwidthHigh capacity with reasonable frequency bandwidth

4G and its Systems4G and its Systems

Some of the systems for future mobile communications Some of the systems for future mobile communications are:are:

Broad-Band Wireless SystemsBroad-Band Wireless Systems Intelligent Transport SystemsIntelligent Transport Systems High Altitude Stratospheric Platform Station Systems High Altitude Stratospheric Platform Station Systems

(HAPS)(HAPS)

HAPSHAPS

Optical intercommunication linksOptical intercommunication links Broadband access link Broadband access link Operated at an altitude between 3-22KmOperated at an altitude between 3-22Km

INTRODUCTIONINTRODUCTION

A “Stratellite” is a high A “Stratellite” is a high altitude airship (HAA) altitude airship (HAA) which are unmanned which are unmanned Kevlar balloons filled Kevlar balloons filled with helium with helium

STRATELLITESTRATELLITE HAA 25 times larger than “Good year blimp”HAA 25 times larger than “Good year blimp” Placed in stratosphere 13 miles above the earthPlaced in stratosphere 13 miles above the earth Placed significantly lower than earth’s lower orbitPlaced significantly lower than earth’s lower orbit Can service a 3,00,000 square mile areaCan service a 3,00,000 square mile area

First StratelliteFirst Stratellite

CONSTRUCTIONCONSTRUCTION

Outer layer is made of Outer layer is made of spectraspectra

Spectra is a fabric Spectra is a fabric used in bullet proof vestsused in bullet proof vests

Inside layer is made of Inside layer is made of Mylar Mylar

Mylar is a thin but Mylar is a thin but strong polyester filmstrong polyester film

Filled with a mixture of Filled with a mixture of helium and air helium and air

CONSTRUCTIONCONSTRUCTION Propeller Propeller Solar cellsSolar cells Regenerative fuel cellsRegenerative fuel cells Helium gas bagHelium gas bag Catenary curtainCatenary curtain X-shaped tail assemblyX-shaped tail assembly Hybrid electric motorsHybrid electric motors TransponderTransponder

WorkingWorking

The helium gas expands The helium gas expands pushing air out and lifting pushing air out and lifting airshipairship

Uses solar cells sprayed on Uses solar cells sprayed on their surface to generate their surface to generate electricity electricity

The generated electricity The generated electricity drives propellers that work drives propellers that work with GPS technology to with GPS technology to keep the stratellite keep the stratellite stationarystationary

PROSPROS

Signal latencySignal latency Low expensive launchesLow expensive launches Service an area of 300,000 Service an area of 300,000

square-milessquare-miles Two-way high speed data Two-way high speed data

communication communication High speed broad-band access High speed broad-band access

even in remote areaeven in remote area

CONSCONS

• may lead to traffic problems in stratosphere may lead to traffic problems in stratosphere • would require efficient ground control and maintenancewould require efficient ground control and maintenance

SERVICESSERVICES

By linking several By linking several stratellites we can provide stratellites we can provide wireless broadband wireless broadband network for thousands of network for thousands of milesmiles

We can be connected to We can be connected to internet immediately after internet immediately after reopening the laptopreopening the laptop

APPLICATIONSAPPLICATIONS

The Stratellite can provide The Stratellite can provide efficient solutions in the efficient solutions in the field of fighting ecological field of fighting ecological disastersdisasters

The Stratellite can be used The Stratellite can be used as a floating mobile as a floating mobile telecommunication station telecommunication station for all telecommunication for all telecommunication

CONCLUSIONCONCLUSION

• Provide the require facilities of wireless communication more efficiently than the ordinary Provide the require facilities of wireless communication more efficiently than the ordinary towers towers

• Minimizes the cost of communicationMinimizes the cost of communication• The idea of stratellite, if successful, would be revolutionary for underserved areas and also The idea of stratellite, if successful, would be revolutionary for underserved areas and also

play a vital role in future generation wireless communicationplay a vital role in future generation wireless communication• When all satellite communications are blocked due to superheating of the stratosphere, When all satellite communications are blocked due to superheating of the stratosphere,

Stratellites can maintain their own global communicationsStratellites can maintain their own global communications

ReferencesReferences

http://en.wikipedia.org/wiki/Stratellitehttp://en.wikipedia.org/wiki/Stratellite

http://www.sanswire.comhttp://www.sanswire.com

http://www.yenra.comhttp://www.yenra.com

http://pesn.comhttp://pesn.com