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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

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Presentation Transcript


Datarate is the Goal

  • Requirement

    • 100Mb/s

    • Wide area

    • By 2010

      How?

  • USA – WLAN

  • Europe – convergence

  • Japan – new air interface


What are key technologies
What are key technologies?

  • Telecommunications Council Report 2001

    • New air interface

    • Software Defined Radio

    • Adaptive Array Antennas

    • High level modulation schemes

    • Dynamic link adaptation


What are the key technologies
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


Access scheme
Access Scheme

  • 4-5 GHz

  • NTT DoCoMO defined access scheme

    • (referenced 4 year study)

  • OFDMA vs MC –CDMA


Current multiple access technologies

2002 c NTT DoCoMo

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 coversboth environments.

7


Ofcdma

Variable Spreading Factor MC CDMA

Spreading and Scrambling

#Cmux

Code

Multiplexing

#2

Code #1

f

SF

SF

SF

OFCDMA

And the winner is ……..

OFCDMA is MC CDMA. If the spreading factor = 1, MC-CDMA  OFDMA.


Smart antennas
Smart antennas

  • Considered “Indispensable”

  • All labs have active programmes

  • Trial antenna at KDDI

  • Status:

    • Probably lag Europe e.g. NTTDoCoMo array RLS processor


Tx

Tx

Processing

DeMux

Encoding,

Modulation,

Rx

Processing

Demodulation

Decoding,

Mux,

Tx

Tx

Tx

Rx

Rx

Rx

Rx

MIMO CHANNEL

é

ù

h

h

L

11

1

N

ê

ú

T

O

M

ê

ú

ê

ú

M

h

h

L

ë

û

M

1

M

N

R

R

T

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”


Will this achieve 100mb s
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?


Terminals
Terminals

  • 3G is here

  • NTTDoCoMo – FOMA W-CDMA terminals from NEC and Matsushita

  • KDDI – CDMA 2000 – multiple suppliers


Foma terminals

2001 c NTT DoCoMo

FOMA -Terminals

Visual

Standard (i-mode)

Data Card

FOMA P2401

FOMA N2001/2002

FOMA P2101V /D2101V

384k Packet,

64k Data,

64k Real-time Video, Voice,

384k Packet/ i-mode

Voice, 384k Packet/ i-mode,

64k Data, Multi Access

13


KDDI

  • Pics and projections


4g terminal concepts
4G terminal concepts

  • Voice recognition

  • Wearable communicators/computers

  • Status:

    • Early days


4g terminal concepts1
4G terminal concepts

  • Voice recognition

  • Wearable communicators/computers

  • Status:

    • Early days


Direct conversion
Direct conversion

  • Quoted as necessary for 4G by NTT, KDDI, Fujitsu and Matsushita

  • Single chip solution

  • Reduced cost


Software defined radio
Software Defined Radio

  • IEICE SDR study group

  • Considered ‘key’

  • Unclear strategy for terminals or basestations


Summary
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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