Wireless technology beyond 3g in japan
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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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Wireless Technology Beyond 3G In Japan

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Wireless technology beyond 3g in japan

Wireless Technology Beyond 3G In Japan

Dave Smith


Technology evolution

Technology Evolution


Wireless technology beyond 3g in japan

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


Wireless technology beyond 3g in japan

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


Wireless technology beyond 3g in japan

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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