Wireless Technology Beyond 3G In Japan

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Wireless Technology Beyond 3G In Japan

• Dave Smith

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Technology Evolution
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Datarate is the Goal

• Requirement
• 100Mb/s
• Wide area
• By 2010
• How?
• USA WLAN
• Europe convergence
• Japan new air interface

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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

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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

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Access Scheme

• 4-5 GHz
• NTT DoCoMO defined access scheme
• (referenced 4 year study)
• OFDMA vs MC CDMA

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Current Multiple Access Technologies
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.
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.
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OFCDMA
And the winner is ..
OFCDMA is MC CDMA. If the spreading factor 1,
MC-CDMA ? OFDMA.
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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 RD labs have a programme
• No obvious advance over European knowledge
• USA well ahead of rest of the world

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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?

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Terminals

• 3G is here
• NTTDoCoMo FOMA W-CDMA terminals from NEC and
  Matsushita
• KDDI CDMA 2000 multiple suppliers

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FOMA -Terminals
Visual
Standard (i-mode)
Data Card
FOMA P2401
FOMA N2001/2002
FOMA P2101V /D2101V
384k Packet, 64k Data,
Voice, 384k Packet/ i-mode, 64k Data, Multi
Access
64k Real-time Video, Voice, 384k Packet/ i-mode
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KDDI

• Pics and projections

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4G terminal concepts

• Voice recognition
• Wearable communicators/computers
• Status
• Early days

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4G terminal concepts

• Voice recognition
• Wearable communicators/computers
• Status
• Early days

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Direct conversion

• Quoted as necessary for 4G by NTT, KDDI, Fujitsu
  and Matsushita
• Single chip solution
• Reduced cost

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Software Defined Radio

• IEICE SDR study group
• Considered key
• Unclear strategy for terminals or basestations

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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 .

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