T-DMB Receiver Technology

June 28. 2005

박 일 근 / CEOPERSTEL INC.

KRnet 2005 2

IndexIndex

1. 지상파 DMB의 개요

2. 지상파 DMB 수신기 설계

3. 지상파 DMB 수신기 성능 측정

Standard / T-DMB Concept / Structure

System Design / Requirements / Chips

Sensitivity / Selectivity / Fading

4. 지상파 DMB 수신기 Issues Power Saving / Cost Saving / Data Service

KRnet 2005 3

1. 지상파 DMB의 개요

KRnet 2005 4

지상파 DMB의 개요 Standard for Digital RadiosStandard for Digital Radios

ITU-R System A(Eureka-147)

New Band (Band-III, L-Band)OFDM

ITU-R System A(Eureka-147)

New Band (Band-III, L-Band)OFDM

European countriesCanadaAustraliaKoreaTaiwanSingaporeChina…

ITU-R System E2630~2655MHz

CDM

ITU-R System E2630~2655MHz

CDM

JapanSK Telecom

IBOCHD-RadioFM Band

OFDM

IBOCHD-RadioFM Band

OFDMU.S.A. XM-Radio

SiriusWorld Space

Satellite

XM-RadioSirius

World SpaceSatellite

U.S.A.DRM

SW BandDRM

SW Band

Non-InternationalStandards

DMBMultimedia over

Eureka-147

DMBMultimedia over

Eureka-147

KRnet 2005 5

Concept of T-DMBConcept of T-DMB지상파 DMB의 개요

- 기존의 유럽 디지털 라디오 규격인 DAB 시스템을 이용하여 Multimedia 전송

기존의 DAB 시스템

DMB를 위해 추가되는 부분

StreamMode

DABMultiplexer

Packet Data Service

Audio Program Service

OFDMModulation

PacketMode

TSMultiplexer

RSEncoder(204,188)

ConvolutionalInterleaver

Video Encoder(H.264)

Audio Encoder(BSAC)

VideoService

AudioService

DataService

Multimedia Multiplexer DAB System (ETSI 300 401)DMB

MOT MUSICAM

Transmitter

KRnet 2005 6

DMB StructureDMB Structure지상파 DMB의 개요

“DMB ENSEMBLE ONE”

“ALPHA 1RADIO”

“BETARADIO”

“ALPHA 2RADIO”

Audio ALPHA-TMC

ALPHA-SI

Multi-media

2nd-ryAudio

Multi-Media

Sub CHa

Sub CHb

Sub CHc

Sub CHd

Sub CH63FIDC

Ensemble

Service

Service components

Main Service Channel

MCI SI

KRnet 2005 7

지상파 DMB 표준 요약지상파 DMB 표준 요약지상파 DMB의 개요

REQUIREMENTSREQUIREMENTSCONTENTSCONTENTS

ETS 300 401 / Coded OFDM - 4 DPSKETS 300 401 / Coded OFDM - 4 DPSKMODEM StandardMODEM Standard

Band III (174~240MHz), 16KHz StepBand III (174~240MHz), 16KHz StepFrequency & ResulotionFrequency & Resulotion

-96dBm @ Pe=1x10-4 (Viterbi decoder out) -96dBm @ Pe=1x10-4 (Viterbi decoder out)Recommended SensitivityRecommended Sensitivity

8Kbps @ stream mode input of DAB multiplexer8Kbps @ stream mode input of DAB multiplexerData Rate ResolutionData Rate Resolution

RS Decoder : (n,k) = (204,188)Interleaver : 12 branch 17 Byte depthRS Decoder : (n,k) = (204,188)Interleaver : 12 branch 17 Byte depth

Outer Error Correction CodeOuter Error Correction Code

Multimedia MultiplexerMultimedia Multiplexer MPEG-2 / TSMPEG-2 / TS

VideoVideoCompression : MPEG-4 / H.264Frame Rate : up to 30fpsFormat : QCIF / QVGA / CIF / WDF

Compression : MPEG-4 / H.264Frame Rate : up to 30fpsFormat : QCIF / QVGA / CIF / WDF

AudioAudioCompression for Audio Service : MUSICAM up to 384Kbps

Multimedia Service : MPEG-4 / BSAC up to 256KbpsCompression for Audio Service : MUSICAM up to 384Kbps

Multimedia Service : MPEG-4 / BSAC up to 256Kbps

DataDataData Service for Multimedia service : BIFS (optional

Packet service : MOTSData Service for Multimedia service : BIFS (optional

Packet service : MOTS

KRnet 2005 8

한국의 지상파 DMB 계획한국의 지상파 DMB 계획지상파 DMB의 개요

6MHz

CH.7 CH.9 CH.10 CH.11 CH.13

서울지역지상파 DMB Ensemble

KRnet 2005 9

2. 지상파 DMB 수신기 설계

KRnet 2005 10

지상파 DMB 수신기 설계 지상파 DMB 수신기 구조-I지상파 DMB 수신기 구조-I

OFDMDEMODE

EUREKADEMUX

RS,DI&

TSDE-MUX

VIDEODECODER

(H.264)TUNER

AUDIODECODER

(BASC)

RF DAB Processor DMB ProcessorANT User Interface

-Outer Decoder-TS De-Multiplexer-H.264 Decoder-BSAC Decoder-MUSICAM Decoder-User Interface(LCD/SP/KEY etc.)

-A/D Conversion-OFDM Demodulator-Eureka Demultiplexer-Stream Data Interface

-Band-III & L-BandReceiver-CH Selection

KEYs

KRnet 2005 11

지상파 DMB 수신기 설계 지상파 DMB 수신기 구조-II지상파 DMB 수신기 구조-II

DMB Processor

DABReceiver

T-DMBReceiver

MUSICAM Audio

KRnet 2005 12

지상파 DMB 수신기 설계 수신 시스템 설계수신 시스템 설계

KTBNNF out 10log10

dBmNCdBmN out 10896

dB

MHzdBmNF628.3

001.0/7.12931038.1log10108 2310

실용적인 Band-III용 수신기의 감도(sensitivity)는 BER = 1x10-4 일때 -96dBm 이하일 것이 요구된다, 이때요구되는수신기 전체 Noise figure를 구해보면 다음과 같다.

여기서 K 는 Boltzman의 상수이고, T는 절대온도이며, B는 system 대역폭으로 DAB의 경우 약 1.7MHz이다. Nout 은 system의 noise floor로, OFDM Modem에서 BER=1x10-4 을 얻기 위한 C/N은 약12dB 이므로,

이다. 따라서상온 20C (T=293F)의 경우

이다. 즉수신기 전체 noise figure는 약 3.6dB 보다 작아야한다.

KRnet 2005 13

지상파 DMB 수신기 설계 AntennaAntenna

Vertical1/4 or 5/8

Telescopic1/4

HelicalLoading coil

EarphoneAntenna

Patch

Loop Top

High gain (>0dBi), Small size, Omni direction, Mobility, Easy to installation, Multi-band support Since the signal strength will not so good, we need good antenna for initial stage If many Gap filler is installed, the load of antenna will be lightened.

mmMHzMHz

mfc 25.1~724.1

240~174sec/103 8

KRnet 2005 14

지상파 DMB 수신기 설계 RF PartRF Part

Wide capture range for Long Dopler shift

Sharp skirt characteristicfor ACI rejection

High Sensitivity for good signal reception

<-95dBm

LNA

1st MIXer

SAWFILTERSAW

FILTER

2nd MIXer

IFout

OSC 2OSC 1

BAND-III ANT

Control

174MHz~240MHz

BW=1.536MHz

AFC

AMP AMP

AGCAGCNF<3.6dB

Low phase noise for Low BER

Channel Spacing=1.712MHz Resolution=16KHz

Wide dynamic range to robust in Fading

> 95dB

Low power consumption for mobile use

KRnet 2005 15

Multiple pipeline for Multiple service decoding

8~12 bits for high SNR

A/DConverter

A/DConverter

FECDecoder(Viterbi,De-inter)

FECDecoder(Viterbi,De-inter)

PADDemux

PADDemux

MUSICAMAudio

Decoder

MUSICAMAudio

Decoder

DataBufferDataBuffer

Synchronization&

Tracking

Synchronization&

Tracking

HostInterface

HostInterface

Monitor&

Control

Monitor&

Control

FromRF

AFC

Audioinf.

Datainf.

To/FromCPU

OFDMDemod.

(FFT,DQPSK)

OFDMDemod.

(FFT,DQPSK)

Fast synchronization for fast lock (<2Sec)

Multiple FFT for Multi mode support

Soft-decision for low BER

지상파 DMB 수신기 설계 DAB Processor PartDAB Processor Part

KRnet 2005 16

지상파 DMB 수신기 설계 DMB Processor PartDMB Processor Part

SDRAM forAV processing

Cash

Stereo,SNR>90dBDist.<0.1%

Variable data sample rate up

to 128Kbps

MPEG-2TS

DEMUX

MPEG-2TS

DEMUX

RSDecoder(204,188)

RSDecoder(204,188)

Audio Decoder(BSAC)

Audio Decoder(BSAC)

Video

Audio

DataData

Decoder(BIFS)

VideoDecoder(H.264)

VideoDecoder(H.264)

StreamModeData

ConvolutionalDeinterleaver(12 Branch,

17 Byte)

ConvolutionalDeinterleaver(12 Branch,

17 Byte)

Outer Decoder

AV Decoder

Video FormatCIF, QCIF,

QVGA, WDF

Option

Fast code synchronization

Received Data captureand buffering

Low complexityFor power saving

KRnet 2005 17

지상파 DMB 수신기 설계 Chip & Solution WorldChip & Solution World

I&C Technology

RF ChipDAB Chip

A/V Chip or Solution

KRnet 2005 18

DMR132 의 구조DMR132 의 구조지상파 DMB 수신기 설계

OFDMDEMODE

EUREKADEMUX

M&C

H.264 VIDEODECODER

RF CHIPBSAC AUDIODECODER

RF(TRFDRE10)

DAB Prodessor(DRE310)

DMB Processor(DMB110)ANT

5” TFT LCD

Control

DR702 DAB Module

LCDDRIVER

AMPAMP

KEY POWERSD

RA

M(

32MB

)

FLASH

RO

M(

4MB

)

SDR

AM

(

8MB

)

FLASH

RO

M(

1MB

)

SPI

AUDIOCODEC

RS,DI,TS

DeMUX

DC/DCConverter

DMR831 A/V Module

KRnet 2005 19

DMB 튜닝DMB 튜닝지상파 DMB 수신기 기능

PersTel DMBPersTel DMBEnsemble

Service Radio 1Radio 1 DMB 1DMB 1 Radio 2Radio 2 Radio 3Radio 3 Radio xRadio x

Pops MusicPops Music MultimediaMultimedia Primary News

Primary News

SportsSports Data ServiceData ServiceServiceComponents

SecondaryNews

SecondaryNews

Korea National DMBKorea National DMB

Ensemble Label

ServiceLabel

ProgramType

Preset / Manual Tuning Service / Program Type search Secondary Service / Announcement Re-Configuration

KRnet 2005 20

DMB 수신기 FunctionDMB 수신기 Function지상파 DMB 수신기 기능

PersTel Video I T..I

TUNINGEnsemble tuningService selectionAuto/Manual/Seek tuningPTy Search tuningPrimary/Secondary selection

SETTINGVolume controlContrast / Brightness adjustSave / Delete memoryAnnouncement settingSearch condition settingLanguage selection

OSDEnsemble/Service LabelDLS DisplayRSSI DisplaySetting value Display

IDICATIONTuning IndicationPower/Charge IndicationStatus / Error Indication

HOT KETPreset saving / tuningMode change

Audio/VideoDAB/DMB auto detectionVideo Type auto detectionAdaptation for variable AV data rateData decoding and Display

ConnectorAntenna connectorVideo / Audio Input OutputPowerSpeed Detection

KRnet 2005 21

3. 지상파 DMB 수신기 성능 측정

KRnet 2005 22

Receiver TestReceiver Test지상파 DMB 수신기 성능 측정

Reference for DAB part– ETSI EN 50248

Performance Test– Measure the bit error rate (BER) at Viterbi decoder input of DAB processor– Sensitivity : less than -96dBm of input level to maintain BER=1x10-4– Selectivity : Higher than 30dB when power of wanted channel is -60dBm– Maximum input : Higher than +0dBm

Service Test– Decoding All mode (I, II, III, IV) signal– Decoding All level of EEP and UEP signal– Decoding DLS carried in short/variable length X-PAD in 48/24KHz audio– Service / Program type search test– Announcement support test (option)

Display function– Ensemble label, Service label, Primary/Secondary component label– Program type, DLS display– DAB character set display

KRnet 2005 23

수신감도 측정수신감도 측정지상파 DMB 수신기 성능 측정

DR901

PCInterface

BoardDAB Encoder

TransmitterDMB ReceiverDMB Stream

KENWOOD 3801/3802

Power Level adjust-10dB(mW) ~ -81dB(mW)

BER Monitoring (Pe=1x10-4)

Video/Audio quality monitoring

Data rate and EEP level set,

R=1/2

Test pattern data (output of outer code)

• Example of Test set-up for Sensitivity

KRnet 2005 24

BER 측정BER 측정지상파 DMB 수신기 성능 측정

Re-Encoding Technique– Simple self-test at receiver side during signal reception– PN data transmission is not required

AV Sensual Test– Find disturbance level by hearing music or watching a visual contents– Frequency of Click noise in given duration– Number of Mosaic in given frame

KRnet 2005 25

선택도 측정선택도 측정지상파 DMB 수신기 성능 측정

DMB Receiver

DAB Signal Generator 1

Signal Generator 2

Combiner

SelectivePower Meter

Power Level adjust for wanted

signal

Power Level adjust for

unwanted signal

Interferer(unwanted)

Wanted

BER Monitoring (Pe=1x10-4)

Video/Audio quality monitoring

• Adjacent Channel Selectivity (ACS)

Signal 1Wanted

Signal 2Interferer

(unwanted)DAB

1.712MHz

>30dB@Pe=1x10-4

-70dBm

• Far-off Selectivity

Signal 1Wanted

Signal 2Interferer

(unwanted)FM

Modulation

>5MHz

>40dB@Pe=1x10-4

-70dBm

KRnet 2005 26

Fading 측정Fading 측정지상파 DMB 수신기 성능 측정

DAB Signal Generator

ChannelSimulator

SelectivePower Meter

Attenuator DMB Receiver

BER Monitoring (Pe=1x10-4)

Video/Audio quality monitoring

Power Level adjust> -75dB(mW)

Measuring Frequency

Mode Channel Simulation Profile

225.648MHz I Urban at 25Km/hRural at 120Km/hSFN (VHF) at 60Km/h

KRnet 2005 27

DAB/DMB Test EquipmentDAB/DMB Test Equipment지상파 DMB 수신기 성능 측정

DABMultiplexer

OFDMModulator

MPEGEncoder

Video

Audio

RFUp converter

AudioAnalyzer

Audio

TC-2300A DAB/DMB Tester

“Combining OFDM modulator, RF Up Converter, and

Ensemble Multiplexer in one convenient box”

www.tescom-lab.comTaiwan Agent: Mitronics International Corp.

Tel: 886-2-27097626, E-mail: mike@mitronics.com.tw

RF Up-converterFrequency: Band Ⅱ, Ⅲ, LLevel: 0dBm ~ -120dBm

Ensemble MultiplexerTransmission Mode Ⅰ,Ⅱ,Ⅲ,ⅣSix Services (Two Services are editable)Ten Service Components (Two Service

Components are editable)Easy Protocol Parameters changing using

GUI (Graphic LCD and Key pad)Multiplex re-configuration Test functionAnnouncement Test functionTII Test function512MByte Built in SD-Memory to store

Video, Audio and Data

Audio AnalyzerSINAD, Distortion, Frequency, Level

KRnet 2005 28

4. 지상파 DMB 수신기 Issues

KRnet 2005 29

Power SavingPower Saving지상파 DMB 수신기 Issues

• Power consumption– RF Part ( 400mW) + DAB Part ( 200mW) + DMB Part ( 900mW) 1.5W– LCD(5”) + Backlight 3500mW– Total for DMB Receiver 5.0W– About 1176mA @5V with DC/DC converter of efficiency=85%

• Developments for Low power Device– Low power RF chip is required– Dedicated chip (SoC) for DAB and DMB processor is required– Low core voltage

• Power managements Algorithm– RF power saving algorithm– Optimize the AV decoding algorithm to reduce iteration number

KRnet 2005 30

Cost SavingCost Saving지상파 DMB 수신기 Issues

• Optimization of hardware– Minimize the parts by optimized hardware

design– Need DMB dedicated chips (Soc)– Minimize the adjust point to reduce

manufacturing cost– Dynamic allocating of job with a chip (such

like DSP)• Combined with other devices

– DMB into mobile phone– DMB into PDA– DMB into Multimedia devices (DVD player,

PMP player, MP3 player, etc.)– Telemetric function into DMB receiver

• Market promotion– Parts price will be changed depending on

market size– Newly good devices will be introduced if

market is growing– Good contents will increase DMB market

T-DMB(H.264/BASC)

T-DMB(H.264/BASC)

WMV9/WMA9WMV9/WMA9

MPEG/AAC

MPEG/AAC

MultimediaPlayer

MultimediaPlayer

KRnet 2005 31

Support Multi-StandardsSupport Multi-Standards지상파 DMB 수신기 Issues

Stage – I : SDR Stage – II : Combined

T-DMBReceiving

T-DMBReceiving

S-DMBReceivingS-DMB

Receiving

DVB-HReceiving

DVB-HReceiving

DRMReceiving

DRMReceiving

SystemSystem--AADedicatedDedicatedSystemSystem--AADedicatedDedicated

OS / MMI (DSP)OS / MMI (DSP)OS / MMI (DSP)OS / MMI (DSP)

SystemSystem--EEDedicatedDedicatedSystemSystem--EEDedicatedDedicated

Common Function (ASIC)Common Function (ASIC)Common Function (ASIC)Common Function (ASIC)

KRnet 2005 32

DMB Service ModelDMB Service Model지상파 DMB 수신기 Issues

다양한 서비스 모델의 개발

DMB를 채용하면 이런 서비스들이 가능하다는 비젼 제시가 요구됨

DMB의 특징을 살릴 수 있는 서비스 모델의 개발이 필요

방송과 통신의 융합된 고 부가가치의 서비스 모델 제시가 필요

DMB 특성에 맞는다양한 ContentsDMB 특성에 맞는다양한 Contents EPGEPG TPEGTPEG Data ServicesData Services Service

Down LoadService

Down Load

Interactive Service 큰 시장을 만들기 위하여서는 Interactive Service 가 필요

• 사용자들은 프로그램에 참여하기를 원함

• Interactive service 는 재미를 가중 시킬 수 있슴

• 서비스 제공자에게 다양한 business model 을 제공할 수 있슴

Mobile phone을 Return channel 로 이용할 수 있다.

• For simple applications; Quiz, Home shopping, SMS, etc…

• DMB receiver 와 mobile phone 사이에 특수한 interface 필요

• Required Authentication and CAS

KRnet 2005 33

EpilogEpilog

When I took part in DMB project, I have a little dream that the DAB should be deployed well in Korea.

I thought that DAB will has many difficulties only with audio service under oriental culture.

So, I have been doing my best for Multimedia transfer via current DAB system.

Every in the morning, I wonder if it is only a dream ! The DMB is getting popular and growing rapidly in worldwide.

Today, what kind of dream should I have ?

Thank you !

E-mail : ikepark@perstel.com

URL : www.perstel.com