4 G TECHNOLOGY

18-Oct-11SAURABH BANSAL B,.TECH ECE III

SEM 1

4G TECHNOLOGY

(MOBILE COMMUNICATION

PRESENTED BY, SAURABH BANSAL B.TECH (ECE) IIIRD SEM

AMITY UNIVERSITY RAJASTHAN

4G TECHNOLOGY

Fourth-Generation

Cellular Communication

System

18-Oct-11

SAURABH BANSAL B,.TECH ECE III SEM

2


SEM 3

INTRODUCTIONWHAT IS 4G?Key Technologies Required for 4GComparing Key Parameters of 4G with 3G4G processing4G PossibilitiesApplications of 4GADVANTAGES OF 4GLIMITATIONSCONCLUSION

4G TECHNOLOGY

(MOBILE COMMUNICATION)


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While 3G hasn't quite arrived, designers arealready thinking about 4G technology. With itcomes challenging RF and baseband designheadaches. Cellular service providers areslowly beginning to deploy third-generation(3G) cellular servicesThis is not merely a numbers game. 4G isintended to provide high speed, high capacity,low cost per bit, IP based services.


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4G is simply an initiative by academic R&D labs to move beyond the limitations and problems of 3G which is having trouble getting deployed and meeting its promised performance and throughput. In reality, as of first half of 2002

4G is a conceptual framework for or a discussion point to address future needs of a universal high speed wireless network that will interface with wire line backbone network seamlessly


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International Mobile Telecommunications’ -2000(IMT-2000) and the Universal MobileTelecommunications System (UMTS) will be amongthe first 3G mobile communication systems to offerwireless wideband multimedia services using theInternet protocol. Two important technologicalchanges will facilitate this advancement. The firstchange is a shift from last-generation radio-accesstechnologies such as the global system for mobile(GSM) communication, CDMA One (an IS-95 codedivision multiple access standard

4G MOBILE COMMUNICATIONSYSTEMS

Key Technologies Required

for 4G MIMO

Signal multiplexing between antennas

-Smart antennas

Well suited to OFDM

OFDMA


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Key Technologies Required for 4G

Coverage

Parent coverage ------ Pico-cell coverage


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Orthogonal Frequency DivisionMultiplexing (OFDM) not only providesclear advantages for physical layerperformance, but also a framework forimproving layer 2 performance byproposing an additional degree of free-dom. Using ODFM,


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3G

(including2.5G,sub3G) 4G

Major Requirement

Driving Architecture

Predominantly voice driven - data was

always add on

Converged data and

voice over IP

Network Architecture Wide area cell-based Hybrid - Integration of

Wireless LAN (WiFi,

Bluetooth) and wide area

Speeds 384 Kbps to 2 Mbps 20 to 100 Mbps in mobile

mode

Frequency Band Dependent on country

(1800-2400 MHz)

Higher frequency bands

(2-8 GHz)

Bandwidth 5-20 MHz 100 MHz (or more)

Switching Design

Basis

Circuit and Packet All digital with

packetized voice

Access Technologies W-CDMA, 1xRTT, Edge OFDM and MC-

CDMA (Multi

Carrier CDMA)

Forward Error

Correction

Convolutional rate 1/2, 1/3 Concatenated

coding scheme

Component Design Optimized antenna design, multi-

band adapters

Smarter Antennas,

software multiband

and wideband

radios

IP A number of air link protocols,

including IP 5.0

All IP (IP6.0)


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3G vs. G

0

10

20

30

40

50

60

70

80

90

100

Mbps

3G 4G

4G


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we've seen in the 3G realm. One promisingunderlying technology to accomplish this ismulticarrier modulation (MCM), a derivative offrequency-division multiplexing. Forms ofmulticarrier systems are currently used in digitalsubscriber line (DSL) modems, and digitalaudio/video broadcast (DAB/DVB).,


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The structure of a 4G transceiver is similar to any otherwideband wireless transceiver. Variances from atypical transceiver are mainly in the basebandprocessing. A multicarrier modulated signal appearsto the RF/IF section of the transceiver as a broadbandhigh PAVR signal.


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4G is based on a multicarrier technique, keybaseband components for the transmitter andreceiver are the FFT and its inverse (IFFT). In thetransmit path the data is generated, coded,modulated, transformed, cyclically extended,and then passed to the RF/IF section


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4Gwill require an improved receiver section,compared to 3G, to achieve the desired performancein data rates and reliability of communicationShannon's Theorem specifies the minimum required SNR

for reliable communication:


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•The digital-to-analog converter (DAC) is an important piece of the transmit chain. It requires a high slew rate to minimize distortion, especially with the high PAVR of the MCM signals.

4G Possibilities

Mobile Gaming 4G

Experience enhanced wireless

capabilities that deliver mobile

gaming interaction with latency less

than five milli seconds.

Play online multiplayer games while

traveling at high speeds or sitting

outside.


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4G Possibilities

Personal Media Repository

Create a personal media

repository that can be

accessed from home and on

the road to view photos,

watch movies and listen to

your personal music

collection.

4G


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4G Possibilities

Broadband Access in Remote Locations

4G networks will provide a wireless alternative for broadband access to residential and business customers.

4G


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Applications of 4G

Life-Saving: Telemedicine

Video Conferencing

Telegeoprocessing: GIS,GPS

Better Usage of Multimedia Applications

Voice over Internet Protocol (VoIP) for IPv6


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1.Wider bandwidths and higher bitrates.2. Global mobility and service portability.3. Scalability of mobile network.4. Digital network elements.5. Tight network security


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System designers and services providers are looking forward to a true wireless broadband cellular system, or 4G. To achieve the goals of 4G, technology will need to improve significantly in order to handle the intensive algorithms in the baseband processing and the wide bandwidth of a high PAVR signal.

Thank U


SEM 26

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Category:	Engineering
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4 G TECHNOLOGY

Engineering