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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
slide3

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
slide10

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

slide14
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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