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PRESENTATION
ON
LONG TERM EVOLUTION SYSTEM
Submitted by: Nishank pandya Final year,EC-B1
CONTENTS
o HISTORY
o INTRODUCTION
o LTE ARCHITECTURE
o LTE TECHNIQUES
o LTE ADVANCE SYSTEM
THE HISTORYo 1G (Early 1980s)
o – Analog speech communications
o 2G (Early 1990s)– Digital speech communications.– TDMA and narrowband CDMA.– Ex: GSM
o 3G (Late 1990s)– Global harmonization and roaming.– Wideband CDMA– Ex: UMTS
BEYOND 3G
o 3G Partnership Project is currently developing evolutionary/ revolutionary systems beyond 3G– 3GPP Long Term Evolution (LTE)
o IEEE 802.16-based WiMAX is also evolving towards 4G through 802.16m
INTRODUCTION OF LTE
o Peak data rate– 100 Mbps DownLink, 50 Mbps Uplink within 20
MHz bandwidth.– Up to 200 active users in a cell (5 MHz).
o Mobility– Optimized for 0 ~ 15 km.– 15 ~ 120 km/h supported with high
performance.– Supported up to 350 km/h or even up to 500
km/h.o Spectrum flexibility: 1.25 ~ 20 MHz.
LTE V/S OTHER TECHNOLOGIES
3G (14.4 Mbps) 4G (1 Gbps)
2G to 4G Evolution and data download rate
LTE ARCHITECTURE
)
LTE ENABLING TECHNOLOGIES
o Two main technologies
1. Orthogonal Frequency Division Multiplexing (OFDM)
2. Multiple-Input Multiple-Output (MIMO)
WHAT OFDM ? o The subcarriers are orthogonal to each other and can
be overlap.
o OFDM is suitable for multi path fading and high data rate.
Ch.1
Ch.2 Ch.3 Ch.4 Ch.5 Ch.6 Ch.7 Ch.8 Ch.9 Ch.10
Ch.3 Ch.5 Ch.7 Ch.9
Ch.2 Ch.4 Ch.6 Ch.8 Ch.10
Ch.1
Conventional multicarrier techniques
Orthogonal multicarrier techniques OFDM
50% bandwidth saving
frequency
frequency
A
B
Traditional FDM Signal and OFDM
MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO)
o MIMO provides high data rate,better cell coverage
without increasing bandwidth.
o SU-MIMO and MU-MIMO are types of MIMO system.
REQUIREMENTS FOR LTE-ADVANCED (LTE-A)
o LTE-A shall have same or better performance than LTE
o Peak data rate Downlink: 1 Gbps, Uplink: 500 Mbps
o Same requirements as LTE for mobility, coverage, synchronization, spectrum flexibility etc
LTE-A TECHNOLOGY PROPOSALS
o MIMO enhancements
o Cooperative multi-site transmission
o Repeaters and relays
CONCLUSION
o Mass deployment to begin around 2012.
o Devices which are covered under LTE are – Mobile phones, laptops, cameras etc.
o Assured easy use with older wireless technologies such as GSM, WCDMA/HSPA, CDMA, TD-SCDMA.
Thank you. . . .
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