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Wireless Technology Beyond 3G In Japan. Dave Smith. Technology Evolution. Datarate is the Goal. Requirement 100Mb/s Wide area By 2010 How? USA – WLAN Europe – convergence Japan – new air interface. What are key technologies ?. Telecommunications Council Report 2001 New air interface - PowerPoint PPT Presentation
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1©Roke Manor Research 2002
RokeManorResearch
RC/DWS/Japan
Wireless Technology Beyond 3G In Japan
Dave Smith
2©Roke Manor Research 2002
RokeManorResearch
RC/DWS/Japan
Technology Evolution
Generation G1 G2 G2.5 G3 G3.5 G4 Services Voice Voice / Data Voice / Data Voice / Data Voice / Data Data? Multiple Access
FDMA TDMA / FDMA
TDMA / FDMA
DSSS - CDMA TDMA / FDMA
DSSS - CDMA TDMA / FDMA
PRMA? MC-CDMA?
OFDMA?
Modulation Analogue GMSK 8PSK QPSK QAM ? Coding Convolutional Convolutional Turbo Turbo Turbo /
Woven? Incremental Services
Edge GPRS HSDPA
Incremental Technologies
Digital Modulation
Equaliser
Power Control
Frequency Hopping
Sectored Antennas
CDMA
Turbo Coding
Wide Bandwidth
Adaptive Modulation
MIMO
Smart Antennas
Adaptive Modulation
MIMO
Turbo Coding
(&Beyond)
Smart Antennas
Incremental Benefits
Time Diversity
Reduced Protection
Ratio
Interferer Diversity
Reduced Interference
Increased Bits/Hz
Interferer Diversity
Reduced SIR Needs
Increased Bit Rates
Better Match to
Data
Higher Spectral
Efficiency
3©Roke Manor Research 2002
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RC/DWS/Japan
Requirement 100Mb/s Wide area By 2010
How?
USA – WLAN Europe – convergence Japan – new air interface
Datarate is the Goal
4©Roke Manor Research 2002
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What are key technologies?
Telecommunications Council Report 2001 New air interface Software Defined Radio Adaptive Array Antennas High level modulation schemes Dynamic link adaptation
5©Roke Manor Research 2002
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What are the key technologies?
Telecommunications Council Report 2001 New air interface Software Defined Radio Adaptive Array Antennas High level modulation schemes Dynamic link adaptation
MIMO Direct Conversion receivers
6©Roke Manor Research 2002
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Access Scheme 4-5 GHz NTT DoCoMO defined access scheme
(referenced 4 year study)
OFDMA vs MC –CDMA
137 8 4 6 2 5
T 3
13 7 8 46 2 5
T 2
frequency
code
1 3 7 84 62 5
T 1
O FD M A M C -C D M A
T 3
1
2
3
4
5
6
7
8
T 2
1
2
3
45
67
8
code
frequency
T 1
12345678
・ For Seamless Area Coverage, Multi-cell Structure is necessary.
CDMA can achieve the best spectrum efficiency.
・ For High Throughput, Single-cell Structure is suitable because it can avoid inter-cell interference.
OFDM can achieve the best spectrum efficiency.
Current Multiple Access Technologies Current Multiple Access Technologies
2002 c NTT DoCoMo
7
But ・・・・・- Each scheme is not best in the other cell structure.
- For the flexible area coverage and service deployment with lower cost, both Multi-cell and Single-cell environments should be supported with maximum throughput.
Look for New Wireless Access Scheme that covers both environments.
8©Roke Manor Research 2002
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OFCDMA
And the winner is ……..
OFCDMA is MC CDMA. If the spreading factor = 1, MC-CDMA OFDMA.
f
Spreading and Scrambling
Code #1#2
#Cmux
SF SF SF
CodeMultiplexing
Variable Spreading Factor MC CDMA
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Smart antennas
Considered “Indispensable” All labs have active programmes Trial antenna at KDDI
Status: Probably lag Europe e.g. NTTDoCoMo array RLS
processor
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MIMO Multi-element array antenna at both ends of link. Space-time coding Highly computationally intensive
Status: All Japanese R&D labs have a programme No obvious advance over European knowledge “USA well ahead of rest of the world”
Tx Processing
DeMuxEncoding,
Modulation,
Tx Processing
DeMuxEncoding,
Modulation,
Rx Processing
DemodulationDecoding,
Mux,
Rx Processing
DemodulationDecoding,
Mux,
MIMO CHANNEL
TRR
T
NMM
N
hh
hh
1
111Tx
Tx
Tx
Tx
Rx
Rx
Rx
Rx
11©Roke Manor Research 2002
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Will this achieve 100Mb/s?
No calculation to confirm this yet. Real transmit power issues Battery technology
Testbed under construction: Summer 2002 200m range LoS 100 Mb/s Downlink, 40 Mb/s uplink
Note BLAST work in USA: spectral efficiency of 20-40bit/s,
But real life?
12©Roke Manor Research 2002
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Terminals
3G is here NTTDoCoMo – FOMA W-CDMA
terminals from NEC and Matsushita KDDI – CDMA 2000 – multiple suppliers
FOMA -TerminalsFOMA -Terminals
132001 c NTT DoCoMo
FOMA N2001/2002FOMA N2001/2002 FOMAFOMA P2101V /D2101VP2101V /D2101V FOMAFOMA P2401 P2401
Standard (i-mode) Data CardVisual
Voice, 384k Packet/ i-mode,64k Data, Multi Access
64k Real-time Video, Voice, 384k Packet/ i-mode
384k Packet, 64k Data,
14©Roke Manor Research 2002
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KDDI
Pics and projections
15©Roke Manor Research 2002
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4G terminal concepts Voice recognition Wearable communicators/computers
Status: Early days
16©Roke Manor Research 2002
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4G terminal concepts Voice recognition Wearable communicators/computers
Status: Early days
17©Roke Manor Research 2002
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Direct conversion
Quoted as necessary for 4G by NTT, KDDI, Fujitsu and Matsushita
Single chip solution Reduced cost
90
Input RFat freq fc
LOat freq fc
I out
Q out
Active lowpasschannel filters
Singlechip
18©Roke Manor Research 2002
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Software Defined Radio
IEICE SDR study group Considered ‘key’ Unclear strategy for terminals or
basestations
19©Roke Manor Research 2002
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Summary
100 Mb/s is a target for 4G research Need new air interface to achieve it. Not in tune with Europe or USA If right, Japanese research programme will
provide a technical and market lead in next 10 years
If wrong ….
20©Roke Manor Research 2002
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