4g- fourth generation of wireless mobile communication
TRANSCRIPT
8/6/2019 4G- Fourth Generation of Wireless Mobile Communication
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Aditya Mengi
07EC04
Seminar on :
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Introduction Generations timeline 4G WCDMA
CDMA2000 Moving on…..4G
OFDMA
Advantages MIMO
Other technologies Applications Challenges and Needs Summary References
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Successor to 2G and 3G families of standards
Promises ultra high-speed data services ~100 mbps for high mobility communication
~1 gbps for low mobility communication Comprehensive and all-IP based mobile broadband
solution
Telemedicine, streamed multimedia
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1G• Developed in the 70’s
• Completely analog system
2G• Late 1980’s
• Digitized voice signal, control link(TDMA)
3G
• Early 2001
• Faster data communication, better voice quality
• Speed ~ 2 mbps
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To understand 4G – 3G knowledge a must…
3G WirelessStandards
WCDMA CDMA2000
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Channel BW – 5 Mhz
Modes of operation FDD
TDD Chip rate 3.84 Mbps
Coherent detection
Multiple hand-off
support
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• Duplex pair – 1.25 Mhz
• Doubles the capacity of IS95
• Data speeds ~ 153 kbps
1X
• Evolution – Data Optimized
• Uses CDMA, TDMA • Maximizes user, system
throughput1x EV-DO
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Based on OFDMA ( Orthogonal Frequency DivisionMultiple Access)
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Easily adapts to severe channel conditions – noequalisation required.
Robust against ISI, fading
High spectral efficiency as compared to conventionalmodulation schemes, spread spectrum, etc.
Low sensitivity to time synchronization errors.
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Multiple antennas at transmitter and receiver Improves communication performance
Smart antenna technology
Y = HX + n
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Dynamic Channel Allocation
• Better spectralefficiency
• Increased channelcapacity
• Handles trafficbetter
Channel DependentScheduling
• Channel stateinformation isused
• Throughput,spectral efficiency increased
• Combined withDCA and OFDMA
IPv6 Support
• 4G – completely packet switched
• Increases the no.of IP addresses,no need for NAT
• Unique address
for each device
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Medical information transferred through audiovisualmedia
Consulting, remote medical procedures/examinations
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High capacity wireless system required (4G) Ability to see the internal layout of a building
VirtualNavigation
GIS
GPSHighBW
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• Lower price points
• More coordination among spectrum regulatorsaround the world
• More academic research
• Standardization of wireless networks -modulationtechniques, switching schemes and roaming
• Integration across different network topologies
• Non-disruptive implementation
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4G - still at research stage
Significant potential over 3G
Significantly higher BW and data rates
Will revolutionize mobile telephony experience Applications beneficial to both individual as well
as society
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http://www.four-g.net
http://www.comlab.hut.fi/opetus/333/2004_2005_slides/4G_text.pdf
Suk Yu Hui; Kai Hau Yeung, Challenges in themigration to 4G mobile systems, CommunicationsMagazine, IEEE , Volume: 41 , Issue: 12, Dec. 2003,Pages:54 - 59.
http://www.safecomprogram.gov/NR/rdonlyres/3CBCEA82-9C05-4CF5-B8E7-DBBA0DC6199E/0/4GApplications_Services.pdf