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4th Generation Wireless Systems
Focus on 3GPP LTE
Dr. Sondur LakshmipathiMYMO Wireless Technology Pvt Ltd
Entrepreneurship Center Indian Institute of Science
Bangalore
30 Sept 2010
Agenda
• KEY DRIVERS FOR THE 4G TECHNOLOGIES
• 3GPP LTE: AN EMERGING 4G STANDARD
• KEY TECHNOLOGIES FOR LTE
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KEY DRIVERS FOR THE 4G TECHNOLOGIES
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Cellular Evolution: GSM Phones Enhancing to IP Based LTE
• Phenomenal growth of cellular users across globe
– GSM Global coverage is 80%
– Spread across 219 countries and 750 Operators around the globe
– In India alone, 500 Million cell phone users presently – TOI, Dec’09
– In-Stat surveys show 3 out of 5 users prefer handheld phones with
one-stop communications LTE will be the one stop solutions device
– LTE being standardized as Advanced GSM Huge Mkt opportunities
3GPP LTE* is the natural successor to GSM 4*Third Generation Partnership Project (3GPP)
Cellular Evolution: (contd..)GSM Phones Enhancing to IP Based LTE
• We are at the beginning of a new revolution of 3G & 4G communications – More than 80% of cellular operators are adopting LTE – Emergence of new Competitive & Complementary wireless with
unbelievable speeds and quality – WiFi, WHD exceed 100Mbps– Voice-service by cellular networks is transforming to totally IP-based
networks through LTE
• LTE Mobile Broadband to Generate $70 Billion in Revenues Within 5 Years - Juniper Research, 31 Mar’10
5
Business drivers: Evolution of new cellular standard
• Phenomenal growth of cellular users across globe– In India crosses 500M cell phone users– Worldwide 3 billion users
1G 2G 3.5G3G
Analog Cellular•Voice•AMPS•TACS
GSM,CDMA•Voice•Pager•10kbps data•TDMA/CDMA
eHSPA, EVDO•Voice/Video•Email/Web•10Mbps data•TDMA/CDMA
LTE•Voice over IP•Video over IP•Email/Web•DVB, Multimedia•100 Mbps data•MIMO-OFDM
4G
LTE++•Voice over IP•Video over IP•Email/Web•DVB, Multimedia•1 Gbps data•MIMO-OFDM
2G 3.5G3G
IEEE 802.11b•Email/Web•11Mbps data•CSMA-CA•CCK
IEEE 802.11g,a•Voice over IP•Video over IP•Email/Web•54 Mbps data•CSMA-CA•OFDM
IEEE 802.11n•Voice over IP•Video over IP•Email/Web•600 Mbps data•CSMA-CA•MIMO-FODM
4G
IEEE 802.11VHT•HDTV, OH Projector•Voice.Video over IP•Email/Web•1.2 Gbps data•CSMA-CA•MIMO-FODM
WiFiEvolution
CellularEvolution
1980 1994-98 2008-09 2010-11 2012-14
Cellular & WiFi: The two most successful technologies that hold great promise for future markets
Cellular & WiFi: Two Decades of Phenomenal Growth
Emerging 3G and 4G Standards
Application Segments• Voice, Video, Data, Multimedia Broadcast
Differentiation• Low Power & Low Gate Count , Small Form Factor, High Performance• Innovative solutions
WiFi IEEE 802.11n600 Mbps
IEEE 802.11vht1.2 Gbps
WIMAX IEEE 802.16e72 Mbps
IEEE 802.16m100+ Mbps
3gpp LTE 3gpp LTE100 Mbps
3gpp LTE+180 Mbps
WirelessHD Ver1.04 Gbps
Ver2.025 Gbps
UWB MBOA480 Mbps
IEEE 802.15.3a+1 Gbps
Technology Emerging 3G2008-2010
Future 4G Stds2011-2014
NFCRFIDSmart Cards
NFC & WSN Combos
WCDMA EVDO UMB1 Gbps
3GPP LTE: EMERGING 4G STANDARD
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What is 3GPP LTE? Why is 3GPP LTE?
A flat all IP-architecture with an air-interface that exploits latest advances in communications like SC-FDMA, OFDMA and MIMO.A next-generation enhancement to GSM and CDMA
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LTE Uplink uses Multi-User MIMO, which pairs-up UEs to share the same UL resource to increase cell Throughput
At any given instant, cell’s spectral resource is shared between all active users
Multi Users per Cell: Active, Idle and MU-MIMO modes
Great Scope for LTE Technology Innovations: Cooperative Communications
WiFi2.4GHz
LTE2.7GHz
LTE Tx-Rx in SISO/MIMO
WiFi Tx-Rx in SISO/MIMO
LTE SISO
WiFi SISO
Connectivity toWiFi and LTE in SISO/MIMO mode
NBnon-LTE
WiLTEHH Phone
LTE BS
WiFi
Connectivity toNotebook and LTE BS
WiLTEPhone
WiFiAccess Point
LTE BS
Switching b/wAP or LTE BS
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Global Commitments on LTE
March, 2009 Compilation:List compiled from Informa Telecoms & Media and public announcements. It includes a variety of commitment levels including intentions to trial, deploy, migrate, etc.
For additional information contact [email protected]
http://www.3gamericas.org/documents/LTE%20Commitments%20Mar%202009.pdf
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Global Commitments on LTE (contd..) http://www.3gamericas.org/documents/LTE%20Commitments%20Mar%202009.pdf
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MYMO LTE IP & PRODUCTS
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About MYMO Wireless Technology Pvt Ltd
MW1000 : Test Engineers Delight
RF Unit
GPS 10MHz
ANT ANT
Ref Clk1 PPS
MW1000
Desktop CPU
eNodeBRRH
DL & ULResults
MW1000 : Wave Capture
eNodeBRRH
RF Unit
GPS 10MHz
ANT ANT
Ref Clk1 PPS
MW1000
DesktopCPU
LTE UE
eNodeBDL
UERACH REQ
Splitter Splitter
Splitter
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State-of-the-art algorithm Designs
Patented methods & algorithms for low power and gate count
Seamlessly integrated & partitioned code for HW: PHY-MAC-RLC-PDCP-RRC
Meeting real-time latency constraints as per UE Specs on Quadcore Pentium
Highly optimized
soft IP
Fully verified by 3rd party test tools
RTL Build for SoC/ ASIC
Differentiating Factors
MYMO Wireless Confidential
DST-Lockheed Martin Gold Medal 2009 NASSCOM-2009 Top 6 Finalists Award
KEY TECHNOLOGIES FOR LTE
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OFDM: Orthogonal Frequency Division Multiplexing
• Illumination by single light • Illumination not uniform in all corners of a hall• Break down of bulb complete loss of light
• Illumination by many small light• Illumination is uniform in all points of a hall• Break down of a bulb continue illumination
by other lights
fc fc
fc+Δffc+2Δf
Fc-ΔfFc-2Δf
Single Carrier Modulation Multi-carrier Modulation
Equal Power
Equal PowerP1 P2 P3 P4 P5 P6 P7 P8 P9
P
P = P1+P2+P3+P4+P5+P6+P7+P8
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Multipath
MultipathDirect path
Fading Affects spectrum of Single Carrier Modulation
f
Fading Affecting Multi-carrier Modulation
c
cf
Fading Channel Performance Comparison: Single Carrier and OFDM
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User 1 Channel freq response
User 2 Channel freq response
OFDMA: Multiplexing of Multi User OFDM Signals
•For User-1 and User-2 subcarriers are selected with better SNR.
•Then User-1 and User-2 subcarriers are Multiplexed forming the OFDMA signal
• In LTE Channel Quality Indicator (CQI) is used to select the subcarriers by eNodeB
User 1 & User 2 subcarriers multiplexed
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QAMMapping
ResourceAllocation
M PointDFT Map
Mapping toSubcarriers
PerformN-point IFFTAdd CP; N>M
RF UpConversion
QAMDe-Mapping
ResourceDemux
M PointDFT Map
Mapping toSubcarriers
PerformN-point IFFTAdd CP; N>M
RF DownConversion
BRP
Frequency domain Time domainTime domain
Transform Precoding OFDMData & Control
SC-FDMA Transmitter at the User Equipment
SC-FDMA Receiver at the eNodeB
Up Link: SC-FDMA Transmitter and Receiver
+
MAC
BRPMAC
BRP = Bit Rate Processing
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Code BlockSegmentation
Channel Coding
RateMatching
Code BlockConcatenation
CircularBuffering
MAC
Logic Channel
TransportChannels
CodeWord-0
CodeWord-1
Scrambling
QAM MapQPSK
16QAM64QAM
ScramblingQAM Map
QPSK16QAM64QAM
LayerMapper
Tx Div:CDD
SFBCBeamform
Precoding
2x2MIMO
Precoding
SubcarrierMapper
SubcarrierMapper
OFDM
OFDM
RF
Down Link: OFDMA 2x2 MIMO Transmitter Bit Rate Processing
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THANK YOU
Q & A
29