T-DMB Receiver Technology June 28. 2005 박일근 / CEO PERSTEL INC.
Index 1. 지상파 DMB 의개요 Standard / T-DMB Concept / Structure 2. 지상파 DMB 수신기설계 System Design / Requirements / Chips 3. 지상파 DMB 수신기성능측정 Sensitivity / Selectivity / Fading 4. 지상파 DMB 수신기 Issues Power Saving / Cost Saving / Data Service KRnet 2005 2
1. 지상파 DMB 의개요 KRnet 2005 3
지상파 DMB 의개요 Standard for Digital Radios ITU-R System A (Eureka-147) New Band (Band-III, L-Band) OFDM IBOC ITU-R System E 2630~2655MHz CDM HD-Radio European countries FM Band Canada OFDM Australia Korea U.S.A. Taiwan Singapore China DRM DMB SW Band Multimedia over Eureka-147 Japan SK Telecom XM-Radio Sirius World Space Satellite U.S.A. Non-International Standards KRnet 2005 4
지상파 DMB 의개요 Concept of T-DMB - 기존의유럽디지털라디오규격인 DAB 시스템을이용하여 Multimedia 전송 MOT MUSICAM Audio Program Service Packet Data Service Packet Mode Video Service Video Encoder (H.264) DAB Multiplexer OFDM Modulation Audio Service Audio Encoder (BSAC) TS Multiplexer RS Encoder (204,188) Convolutional Interleaver Stream Mode Transmitter Data Service Multimedia Multiplexer DAB System (ETSI 300 401) DMB 기존의 DAB 시스템 DMB를위해추가되는부분 KRnet 2005 5
지상파 DMB 의개요 DMB Structure Ensemble DMB ENSEMBLE ONE Service ALPHA 1 RADIO BETA RADIO ALPHA 2 RADIO Service components Audio ALPHA- TMC ALPHA- SI 2 nd -ry Audio Multimedia Multi- Media MCI SI FIDC Sub CH a Sub CH b Sub CH c Sub CH d Sub CH 63 Main Service Channel KRnet 2005 6
지상파 DMB 의개요 지상파 DMB 표준요약 CONTENTS REQUIREMENTS MODEM Standard Frequency & Resulotion Recommended Sensitivity Data Rate Resolution Outer Error Correction Code Multimedia Multiplexer Video Audio Data ETS 300 401 / Coded OFDM - 4 DPSK Band III (174~240MHz), 16KHz Step -96dBm @ Pe=1x10-4 (Viterbi decoder out) 8Kbps @ stream mode input of DAB multiplexer RS Decoder : (n,k) = (204,188) Interleaver : 12 branch 17 Byte depth MPEG-2 / TS Compression : MPEG-4 / H.264 Frame Rate : up to 30fps Format : QCIF / QVGA / CIF / WDF Compression for Audio Service : MUSICAM up to 384Kbps Multimedia Service : MPEG-4 / BSAC up to 256Kbps Data Service for Multimedia service : BIFS (optional Packet service : MOTS KRnet 2005 7
지상파 DMB 의개요 한국의지상파 DMB 계획 6MHz 서울지역지상파 DMB Ensemble CH.7 CH.9 CH.10 CH.11 CH.13 KRnet 2005 8
2. 지상파 DMB 수신기설계 KRnet 2005 9
지상파 DMB 수신기 설계 ANT RF TUNER 지상파 DMB 수신기 구조-I DAB Processor OFDM DEMODE EUREKA DEMUX -Band-III & L-Band -A/D Conversion Receiver -OFDM Demodulator -CH Selection -Eureka Demultiplexer -Stream Data Interface KRnet 2005 DMB Processor RS,DI & TS DEMUX User Interface VIDEO DECODER (H.264) AUDIO DECODER (BASC) -Outer Decoder -TS De-Multiplexer -H.264 Decoder -BSAC Decoder -MUSICAM Decoder -User Interface (LCD/SP/KEY etc.) KEYs 10
지상파 DMB 수신기설계 지상파 DMB 수신기구조 -II DMB Processor DAB Receiver MUSICAM Audio T-DMB Receiver KRnet 2005 11
지상파 DMB 수신기설계 수신시스템설계 실용적인 Band-III 용수신기의감도 (sensitivity) 는 BER = 1x10-4 일때 -96dBm 이하일것이요구된다, 이때요구되는수신기전체 Noise figure 를구해보면다음과같다. NF N out 10log10 KTB 여기서 K 는 Boltzman 의상수이고, T 는절대온도이며, B 는 system 대역폭으로 DAB 의경우약 1.7MHz 이다. N out 은 system 의 noise floor 로, OFDM Modem 에서 BER=1x10-4 을얻기위한 C/N 은약 12dB 이므로, 이다. 따라서상온 20 C (T=293 F) 의경우 C N out 96dBm 108dBm N NF 108dBm 10 log 3.628dB 10 1.38 10 23 293 1.7MHz / 0.001 이다. 즉수신기전체 noise figure 는약 3.6dB 보다작아야한다. KRnet 2005 12
지상파 DMB 수신기설계 Antenna 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. c f 8 3 10 m / sec 174MHz ~ 240MHz 1.724m ~ 1.25m Telescopic 1/4 Helical Loading coil Patch Loop Top Vertical 1/4 or 5/8 Earphone Antenna KRnet 2005 13
지상파 DMB 수신기설계 RF Part BAND-III ANT 174MHz~240MHz High Sensitivity for good signal reception <-95dBm Sharp skirt characteristic for ACI rejection 1 st MIXer 2 nd MIXer LNA AMP AMP SAW FILTER IF out BW=1.536MHz NF<3.6dB AGC Low phase noise for Low BER OSC 1 OSC 2 AFC Wide dynamic range to robust in Fading > 95dB Control Channel Spacing=1.712MHz Resolution=16KHz Low power consumption for mobile use Wide capture range for Long Dopler shift KRnet 2005 14
지상파 DMB 수신기설계 DAB Processor Part 8~12 bits for high SNR From RF A/D Converter Multiple FFT for Multi mode support OFDM Demod. (FFT, DQPSK) FEC Decoder (Viterbi, De-inter) Soft-decision for low BER PAD Demux MUSICAM Audio Decoder Data Buffer Audio inf. Data inf. AFC Synchronization & Tracking Monitor & Control Host Interface To/ From CPU Fast synchronization for fast lock (<2Sec) Multiple pipeline for Multiple service decoding KRnet 2005 15
지상파 DMB 수신기설계 DMB Processor Part Fast code synchronization Low complexity For power saving SDRAM for AV processing Cash AV Decoder Video Format CIF, QCIF, QVGA, WDF Outer Decoder Video Decoder (H.264) Video Stream Mode Data Convolutional Deinterleaver (12 Branch, 17 Byte) RS Decoder (204,188) MPEG-2 TS DEMUX Audio Decoder (BSAC) Audio Received Data capture and buffering Variable data sample rate up to 128Kbps Data Decoder (BIFS) Option Data Stereo, SNR>90dB Dist.<0.1% KRnet 2005 16
지상파 DMB 수신기설계 Chip & Solution World RF Chip DAB Chip I&C Technology A/V Chip or Solution KRnet 2005 17
지상파 DMB 수신기 설계 DMR132 의 구조 DR702 DAB Module ANT RF (TRFDRE10) DMR831 A/V Module DAB Prodessor (DRE310) DMB Processor (DMB110) SPI RF CHIP OFDM DEMODE EUREKA DEMUX H.264 VIDEO DECODER 5 TFT LCD LCD DRIVER RS, DI, TS BSAC AUDIO DeMUX DECODER AUDIO CODEC M&C AMP Control 32 FLASH ROM ( M B) 1 SDRAM ( MB) FLASH ROM ( M B) SDRAM ( M B) 8 4 DC/DC Converter KEY KRnet 2005 POWER 18
지상파 DMB 수신기기능 DMB 튜닝 Preset / Manual Tuning Service / Program Type search Secondary Service / Announcement Re-Configuration Ensemble Label Ensemble PersTel DMB Korea National DMB Service Label Service Radio 1 DMB 1 Radio 2 Radio 3 Radio x Service Components Pops Music Multimedia Primary News Sports Data Service Secondary News Program Type KRnet 2005 19
지상파 DMB 수신기기능 DMB 수신기 Function TUNING Ensemble tuning Service selection Auto/Manual/Seek tuning PTy Search tuning Primary/Secondary selection IDICATION Tuning Indication Power/Charge Indication Status / Error Indication OSD Ensemble/Service Label DLS Display RSSI Display Setting value Display SETTING Volume control Contrast / Brightness adjust Save / Delete memory Announcement setting Search condition setting Language selection PersTel Video I T..I Connector Antenna connector Video / Audio Input Output Power Speed Detection HOT KET Preset saving / tuning Mode change Audio/Video DAB/DMB auto detection Video Type auto detection Adaptation for variable AV data rate Data decoding and Display KRnet 2005 20
3. 지상파 DMB 수신기성능측정 KRnet 2005 21
지상파 DMB 수신기성능측정 Receiver Test 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 22
지상파 DMB 수신기성능측정 수신감도측정 Example of Test set-up for Sensitivity PC Data rate and EEP level set, R=1/2 Interface Board KENWOOD 3801/3802 DAB Encoder BER Monitoring (Pe=1x10-4 ) Video/Audio quality monitoring DR901 DMB Stream Transmitter DMB Receiver Test pattern data (output of outer code) Power Level adjust -10dB(mW) ~ -81dB(mW) KRnet 2005 23
지상파 DMB 수신기성능측정 BER 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 24
지상파 DMB 수신기성능측정 선택도측정 Wanted DAB Signal Generator 1 Power Level adjust for wanted signal Combiner BER Monitoring (Pe=1x10-4 ) Video/Audio quality monitoring Power Level adjust for unwanted signal Signal Generator 2 Interferer (unwanted) Adjacent Channel Selectivity (ACS) Selective Power Meter DMB Receiver Far-off Selectivity -70dBm >30dB @Pe=1x10-4 Signal 1 Wanted Signal 2 Interferer (unwanted) DAB -70dBm >40dB @Pe=1x10-4 Signal 1 Wanted Signal 2 Interferer (unwanted) FM Modulation 1.712MHz >5MHz KRnet 2005 25
지상파 DMB 수신기성능측정 Fading 측정 Power Level adjust > -75dB(mW) DAB Signal Generator Channel Simulator Attenuator DMB Receiver Selective Power Meter BER Monitoring (Pe=1x10-4 ) Video/Audio quality monitoring Measuring Frequency Mode Channel Simulation Profile 225.648MHz I Urban at 25Km/h Rural at 120Km/h SFN (VHF) at 60Km/h KRnet 2005 26
지상파 DMB 수신기성능측정 DAB/DMB Test Equipment Video Audio MPEG Encoder DAB Multiplexer OFDM Modulator RF Up converter Audio Analyzer Audio RF Up-converter Frequency: Band Ⅱ, Ⅲ, L Level: 0dBm ~ -120dBm Ensemble Multiplexer Transmission Mode Ⅰ,Ⅱ,Ⅲ,Ⅳ Six 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 function Announcement Test function TII Test function 512MByte Built in SD-Memory to store Video, Audio and Data Audio Analyzer SINAD, Distortion, Frequency, Level TC-2300A DAB/DMB Tester Combining OFDM modulator, RF Up Converter, and Ensemble Multiplexer in one convenient box www.tescom-lab.com Taiwan Agent: Mitronics International Corp. Tel: 886-2-27097626, E-mail: mike@mitronics.com.tw KRnet 2005 27
4. 지상파 DMB 수신기 Issues KRnet 2005 28
지상파 DMB 수신기 Issues Power Saving 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 29
지상파 DMB 수신기 Issues Cost Saving 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) WMV9/ WMA9 MPEG/ AAC Multimedia Player KRnet 2005 30
지상파 DMB 수신기 Issues Stage I : SDR T-DMB Receiving Support Multi-Standards Stage II : Combined DVB-H Receiving System-A SystemDedicated System-E SystemDedicated Common Function (ASIC) S-DMB Receiving KRnet 2005 DRM Receiving OS / MMI (DSP) 31
지상파 DMB 수신기 Issues DMB Service Model 다양한서비스모델의개발 DMB를채용하면이런서비스들이가능하다는비젼제시가요구됨 DMB의특징을살릴수있는서비스모델의개발이필요 방송과통신의융합된고부가가치의서비스모델제시가필요 DMB 특성에맞는다양한 Contents EPG TPEG Data Services Service Down Load Interactive Service 큰시장을만들기위하여서는 Interactive Service 가필요 사용자들은프로그램에참여하기를원함 Interactive service 는재미를가중시킬수있슴 서비스제공자에게다양한 business model 을제공할수있슴 Mobile phone을 Return channel 로이용할수있다. For simple applications; Quiz, Home shopping, SMS, etc DMB receiver 와 mobile phone 사이에특수한 interface 필요 Required Authentication and CAS KRnet 2005 32
Epilog 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 KRnet 2005 33