1 © roke manor research 2002 roke manor research rc/dws/japan wireless technology beyond 3g in...

1©Roke Manor Research 2002

RokeManorResearch

RC/DWS/Japan

Wireless Technology Beyond 3G In Japan

Dave Smith


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


RokeManorResearch

RC/DWS/Japan

Requirement 100Mb/s Wide area By 2010

How?

USA – WLAN Europe – convergence Japan – new air interface

Datarate is the Goal


RokeManorResearch

RC/DWS/Japan

What are key technologies?

Telecommunications Council Report 2001 New air interface Software Defined Radio Adaptive Array Antennas High level modulation schemes Dynamic link adaptation


RokeManorResearch

RC/DWS/Japan

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


RokeManorResearch

RC/DWS/Japan

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.


RokeManorResearch

RC/DWS/Japan

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


RokeManorResearch

RC/DWS/Japan

Smart antennas

Considered “Indispensable” All labs have active programmes Trial antenna at KDDI

Status: Probably lag Europe e.g. NTTDoCoMo array RLS

processor


RokeManorResearch

RC/DWS/Japan

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


RokeManorResearch

RC/DWS/Japan

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?


RokeManorResearch

RC/DWS/Japan

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,


RokeManorResearch

RC/DWS/Japan

KDDI

Pics and projections


RokeManorResearch

RC/DWS/Japan

4G terminal concepts Voice recognition Wearable communicators/computers

Status: Early days


RokeManorResearch

RC/DWS/Japan

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


RokeManorResearch

RC/DWS/Japan

Software Defined Radio

IEICE SDR study group Considered ‘key’ Unclear strategy for terminals or

basestations


RokeManorResearch

RC/DWS/Japan

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 ….


RokeManorResearch

RC/DWS/Japan

1 © roke manor research 2002 roke manor research rc/dws/japan wireless technology beyond 3g in...

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