Download - 4 G TECHNOLOGY
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4G TECHNOLOGY
(MOBILE COMMUNICATION
PRESENTED BY, SAURABH BANSAL B.TECH (ECE) IIIRD SEM
AMITY UNIVERSITY RAJASTHAN
4G TECHNOLOGY
Fourth-Generation
Cellular Communication
System
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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
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