lte ppt
TRANSCRIPT
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Long Term Evolution -A Communication Standard
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Mobile broadband is becoming a reality.
It is estimated that 1.8 billion people will
have broadband by 2012.
Majority of these are served by HSPC.
Replacing HSPC by LTE, the user experience would
be even more better.
OVERVIEW
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Latest 3GPP standard.
Downlink speed up to 150 Mbps.
Uplink speed up to 50 Mbps.
Provide apps like Interactive TV, Voice over
IP, Streaming multimedia, MMOG and
much more.
LTE
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Goals of LTE
Data rate
Throughput
Latency
Bandwidth
Interworking
MBMS
Cost
Mobility
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Single Carrier Modulation and Channel
Equalization.
Orthogonal Frequency Division
Multiplexing (OFDM).
Single Carrier Frequency Domain Multiple
Access (SC-FDMA).
BASIC CONCEPTS
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SC modulation introduces Multipath
Distortion.
Single Carrier Modulation
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Results of Multipath distortion
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Results of Multipath distortion
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Two methods of Channel Equalization:
1. Channel Inversion
2. Rake Equalization
Channel equalizer implementation
becomes increasingly complex as data
rates increase.
Channel Equalization
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Equalizer Topology
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OFDM - Transmitter
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OFDM - Receiver
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Elimination of ISI
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SC-FDMA
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Radio Access Network Architecture
Radio Protocol Architecture
Architecture
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Radio Access Network Architecture
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Radio Protocol Architecture
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Block Diagram
Coding and Modulation
Resource Mapping
Multi-Antenna Transmission
Downlink Transmission Scheme
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Block Diagram
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Cyclic Redundancy Check (CRC)
Channel Coding, Rate Matching, and HARQ
Interleaving
Modulation
Coding and Modulation
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Resource Mapping
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Multi-Antenna Transmission
Spatial Multiplexing
Spatial Multiplexing
with CDD
Beamforming
Beamforming with
CDD
Transmit Diversity
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Block Diagram
Coding and Modulation
Resource Mapping
Multi-Antenna Transmission
Uplink Transmission Scheme
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Block Diagram
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Cyclic Redundancy Check (CRC)
Channel Coding, Rate Matching, and HARQ
Interleaving
Modulation
Coding and Modulation
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Resource Mapping
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LTE is more of a revolution than an evolution.
Wider bandwidths, multicarrier modulation,
multiple antennas and packet scheduling are
the technologies finding exploitation in LTE.
Researches are going on to upgrade LTE as
‘LTE-ADVANCED’.
LTE-Advanced are challenging, both in terms
of the timescale and expected data rates and
performance.
Beyond LTE
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Designed to operate in scarce and valuable
licensed spectrum.
Well positioned to meet the requirements of next-
generation mobile networks.
High performance, mass-market mobile
broadband services, through a combination of high
bit-rates and system throughput – in both the
uplink and downlink – with low latency.
Conclusion
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LTE enabling technologies – OFDM
• R. van Nee and R. Prasad, OFDM for Wireless Multimedia Communications,
Artech House, 2000. – SC-FDMA
• H. G. Myung et al., “Single Carrier FDMA for Uplink Wireless Transmission,” IEEE
Vehicular Technology Mag., vol. 1, no. 3, Sep. 2006.• http://hgmyung.googlepages.com/scfdma
References and Resources
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3GPP LTE – Spec
• http://www.3gpp.org/ftp/Specs/html-info/36-series.htm• http://www.3gpp.org/ftp/Specs/html-info/25814.htm (old)
– E. Dahlman et al., 3G Evolution: HSPA and LTE for MobileBroadband, Academic Press, 2007
– H. Ekström et al., “Technical Solutions for the 3G Long-TermEvolution,” IEEE Commun. Mag., vol. 44, no. 3, March 2006, pp.38-45
– 3G Americas, “Mobile Broadband: The Global Evolution ofUMTS/HSPA - 3GPP Release 7 and Beyond" available at
http://www.3gamericas.org/pdfs/UMTS_Rel7_Beyond_Dec2006.pdf
– http://www.LTEwatch
References and Resources
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tTHANK YOU