SEMINAR PRESENTATION3g 4g

8/7/2019 SEMINAR PRESENTATION3g 4g

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Take a view on:Take a view on:

y Introduction to 3G

y Evolution of wireless Infrastructure

y 3G Capabilities

y 3G Applicationsy Introduction to 4G

y OFDM Modulation

y Benefits of 4G

y Drawbacks

y Summary


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Introduction to 3G:Introduction to 3G:y 3G or 3rd Generation, is a generation of

standards for mobile phones .

y Compared to the older 2G and 2.5G standards,

3G provide peak data rates of at least 200kbit/s.


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In 2008, India entered the 3G arena with the launch

of 3G enabled Mobile and Data services by

Government owned Bharat Sanchar Nigam Ltd.

(BSNL).


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y High-speed data transmissions

y Improved voice quality

y Greater capacity

y Multiple simultaneous services

y Global roaming across networks

y Improved security

y Service flexibility

3G Capabilities


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3G Applications

Wireless Internet

Audio on demand

Electronic postcards

Video conferencing

Secure mobile commerce transactions

Traffic and traveling information - location specific


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The 3G Performance AdvantageThe 3G Performance Advantage

Time to download a 1 MB file:

Fixed line modem: 3 minutes

GSM cell phone: 15 minutes

Enhanced GSM phone: 1-5 minutes

3G phone (outdoor): 4 seconds

3G phone (indoor): 21 seconds


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IntroductionIntroduction to 4G:to 4G:y 4G

stands for the fourth generation of cellularwireless standards.

y It is a successor to 3G and 2G families of

standards. Speed requirements for 4G service setthe peak download speed at 100 Mbit/s and

1 Gbit/s.

y 4G provide an end-to-end IP solution where voice

and data is going to be served to users.


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0FDMModulation:0FDMModulation:y In Orthogonal frequency-division multiplexing (OFDM), a

large number of closely-spaced orthogonal sub-carriers are

used to carry data.


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TransmitterTransmitter

y An OFDM carrier signal is the sum of a number oforthogonal sub-carriers, with baseband data on eachsub-carrier.

y some type of quadrature amplitude modulation (QAM)

or phase-shift keying (PSK) used to modulate a main RFcarrier.


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ReceiverReceiver

y The receiver picks up the signal , which is thenquadrature-mixed down to baseband using cosine and

sine waves at the carrier frequency

y The baseband signals are sampled and digitised usinganalogue-to-digital converters (ADCs), and a forward FFTis used to convert back to the frequency domain.


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3G Vs 4G3G Vs 4G

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 20 Mbps

Access Wideband CDMA Multi-carrier -

CDMA or

OFDM(TDMA)

Switching Circuit/Packet Packet

Mobile top speeds 200 kmph 200 kmph


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Benefits of4G:Benefits of4G:

y High speed, high capacity, and low cost per bit.

y Support interactive multimedia, voice,

streaming video, Internet, and other broadband

services.

y Global access, service portability, and scalable

mobile services.

y Smooth handoff across heterogeneousnetworks.


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Drawbacks:Drawbacks:

y Sensitive to Doppler shift.

y Bandwidth requirement is high.

y Sensitive to frequency synchronization

problems.

y High peak-to-average-power ratio (PAPR),

requiring linear transmitter circuitry, which

suffers from poor power efficiency.


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3G and 4G mobile is a major opportunity forbusiness, commerce and consumers

Brings together the two fastest growing marketsectors - Mobile and Internet

Market, services and standards evolving from 2Gto 3G

Significant opportunities for value added content

and service providers 4G - a promising Generation of wireless

communication that will change peoples lives.

Summary:Summary:


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MyMy references:references:

y http://www.google.com

y http://www.eetimes.com

y http://www.unstrung.com

y http://www.wimaxforum.org

y http://www.electronicsweekly.com

y Etc etc.!!!!!


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SEMINAR PRESENTATION3g 4g

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