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Technical Features of ISDB-T

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Technical Features of ISDB-T ISDB-T Seminar Session 2 Technical Features of ISDB-T 28th-29th August, 2006 In Caracas DiBEG JAPAN Yasuo TAKAHASHI （Toshiba) 1 DiBEG Digital Broadcasting Experts Group Contents •What is ISDB-T? •Comparison of 3 DTTB systems •Structure of ISDB-T Standard •Technical details of ISDB-T •Commonality of ISDB-Tsb (note) (note) Digital Terrestrial Sound Broadcasting of ISDB 2 DiBEG Digital Broadcasting Experts Group 1 1. What is ISDB-T? 3 DiBEG Digital Broadcasting Experts Group ISDB-T is ・・・・ • ISDB-T system was developed by the Association of Radio Industries and Businesses (ARIB) in Japan. • ISDB (Integrated Digital Services Digital Broadcasting) is a new type of digital broadcasting intended to provide audio, video, and multimedia services. T is Terrestrial. • ISDB-T is one of ISDB family. • ISDB-T uses a modulation method referred to as Band Segmented Transmission (BST) OFDM ISDB-T Demo 4 DiBEG Digital Broadcasting Experts Group 2 Requirements for Digitalization Multimedia-service High-Quality TV/ Multi-Channels Flexible/Versatile Effective frequency utilization Mobile and handheld service (ground wave) Commonality of receiver At first, the requirement of digital broadcasting should be established. The requirements described above are for digitalization in Japan. 5 DiBEG Digital Broadcasting Experts Group Requiremenｓ for Digitization →Solutions High-Quality, -HDTV 1CH or SDTV 3CH within 6MHz band. Multi-Channels -Robustness against multi-path Multimedia-Service -Integrated Service(Video/Audio/Data) -High quality Data Service Flexible/Versatile -Bi-directional Service Efficient Spectrum Single Frequency Network(SFN) utilization Mobile and handheld -Robustness against mobile/portable reception service (ground wave) -Both fixed/mobile service within same band →Layer Transmission Technology Commonality of - Commonality for BS/Cable/Terrestrial receiver Broadcasting. 6 DiBEG Digital Broadcasting Experts Group 3 Features of ISDB-T Technical Japanese Requirements for DTTB Specification OFDM Robustness, SFN Segment Structure Extensible, Partial Reception Time Interleaving Mobile Reception, Indoor Reception TMCC Flexible, Versatile 7 DiBEG Digital Broadcasting Experts Group What is Band Segmented OFDM with time interleave? (Example; 1seg + 12 seg) Layer A Layer B (LDTV,Audio,Dat (HDTV or 3 SDTV a) 13segments with Data)) (6MHz bandwidth) frequency Handheld Fixed reception, Mobile reception (One seg. reception (HDTV,etc) Service) •Segmented OFDM; Possible to support fixed/mobile/handheld reception service •Time interleave; reduce impulse noise and reduce the degradation caused by fading (tested in Brazil by Mackenzie and TV GLOBO) 8 DiBEG Digital Broadcasting Experts Group 4 Service Image of ISDB-T in Japan 1 01 ForFor large large Screen Screen 10･ Broadcaster ･･ TelevisionTelevision Dig High Definition Bro ita Sports ad l Picture cas g tin High Quality Sound Multiplexing to One Channel News HDTV Portable HDTV At home Disaster 12 Segment 1 Segment Compresse Compresse dby d by Anytime In the Bus MPEG2 H.264 Anywhere While In the train Original Image walking 9 DiBEG ForFor Portable Portable Terminal Terminal Digital Broadcasting Experts Group 31 2. Comparison of 3 DTTB Systems -Comparison of 3 DTTV systems -Results of comparison test in Brazil -Summary of comparison 10 DiBEG Digital Broadcasting Experts Group 5 Broadcasting Services System ATSCDVB-T ISDB-T Item HDTV/ SDTV ◎ ◎ ◎ Fixed reception Data broadcasting ◎ ◎ ◎ SFN × ◎ ◎ HDTV Mobile × × ◎ reception (○ SDTV) Portable reception × △ ◎ with cellular phone Internet access × △ ◎ 11 DiBEG Digital Broadcasting Experts Group Technical Detail of DTTV Systems - 1 System ATSC DVB-T ISDB-T Launch 1/Nov/1998 Sep/1998 1/Dec/2003 Video coding MPEG-2 Video(ISO/IEC 13818-2) Audio coding Dolby AC-3 MPEG-2 BC MPEG-2 AAC BML (XHTML), Presentation Dase-1 (DVB HTML) Data engine ECMAScript broadcasting Execution engine ACAP DVB MHP ARIB B 23 Multiplex MPEG-2 Systems (ISO/IEC 13818-1) Conditional access DES / NRSS CSS / DVB CA Multi 2 / ARIB B 25 (207,187) (204,188) Outer Reed-Solomon Reed-Solomon code Error code correction Inner 2/3Trellis Code Conv.code(1/2-7/8) 12 DiBEG Digital Broadcasting Experts Group 6 Technical Details of DTTV Systems - 2 System ATSC DVB-T ISDB-T COFDM 8VSB SegmentedCOFDM Modulation (QPSK, (DQPSK,QPSK, 16QAM,64QAM) 16QAM,64QAM) Bit/Symbol Yes Yes Yes Inter- leaving Frequency - Yes Yes time - - 0.1s,0.2s,0.4s,0.8s Excess Bandwidth/ 1/2, 1/4, 11.5% 1/4,1/8,1/16,1/32 Guard Interval 1/8,1/16,1/32 TMCC - - Yes Information bit rate 19.39 Mbps 3.69 -23.5Mbps 3.65 -23.2 Mbps Channel bandwidth 6/7/8 MHz 6/7/8 MHz 6/7/8 MHz 13 DiBEG Digital Broadcasting Experts Group Effect of Time Interleaving • As the experimental result, time interleaving improve required CN ratio about 7 dB in mobile environment on 16QAM. • Diversity system improve about 7dB on 16QAM. • Time interleaving (time diversity) work independently from space diversity. • That is the reason for advantage of ISDB-T in mobile environment. • Time interleaving improve robustness against impulse noise interference that come from power line and motor cycle engine. 14 DiBEG Digital Broadcasting Experts Group 7 Results of Brazilian Tests • Comparison testing of three DTTB systems – ATSC, DVB-T, ISDB-T • Carried out from Aug. 1999 to April 2000 • Laboratories tests – AWGN, impulse noise, multipath interference • Field tests – Coverage, indoor reception 15 DiBEG Digital Broadcasting Experts Group Evaluation of C/N • Interferer = White Noise ATSC DVB-2K DVB-8K ISDB 14,6 dB 19,0 dB 16,9 dB 18,6 dB •ATSC: 8VSB FEC=2/3 (19,39 Mbits) • DVB & ISDB: Choice of parameters define C/N –DVB-2K: 64 QAM FEC=3/4 GI=1/16 2K (19,75 Mbits/s) –DVB-8K: 64 QAM FEC=2/3 GI=1/32 8K (18,09 Mbits/s) –ISDB: 64 QAM FEC=3/4 GI=1/16 4K 0,1s (19,33 Mbit/s) （From the presentation of the Brazilian SET/ABERT study group at NAB2000) 16 DiBEG Digital Broadcasting Experts Group 8 Impulse Noise Relati on between the noise pulse width & interference to signal r atio ATSC - Chip A 30 ISDB-T DVB - NDS - 3/4 1/16 2K 25 DVB - Chip M - 2/3 1/32 8K 20 ATSC ISDB - NEC - 3/4 1/16 4K 0,1s 15 10 DVB8k 5 "I"/C (dB) DVB2k 0 -5 -10 -15 0 1 00 2 00 3 00 4 00 Pulse width (us) • Better performance of the ISDB-T system, by introducing time interleaving 17 DiBEG（From the presentation of the Brazilian SET/ABERT study group at NAB2000) Digital Broadcasting Experts Group Static Multipath Carrier to noise ratio as a function of carrier to echo ratio Comparison at post-echo = 8us 36 34 ATSC - CHIP T ATSC 32 DVB - NDS - 3/4 1/16 2K 30 DVB - CHIP M - 2/3 1/32 8K DVB2k 28 ISDB - CHIP J - 3/4 1/16 4k 0,1s 26 24 ISDB-T C/N (dB) C/N 22 20 DVB8k 18 16 14 024681012 C/E (dB) （From the presentation of the Brazilian SET/ABERT study group at NAB2000) 18 DiBEG Digital Broadcasting Experts Group 9 ISDB-T DVB8k ATSC DVB2k （From the presentation of the Brazilian SET/ABERT study group at NAB2000) 19 DiBEG Digital Broadcasting Experts Group Indoor Reception Indoor Reception: Sites Where the Three Systems Were Tested in the Same Condition 100% 91% 91% 91% 90% 82% 80% 73% 73% 73% 70% 60% 55% 50% 40% 30% 20% Percentual de Recepçã de Percentual 9% 10% 0% Normal Reception Reception + Blender On Reception + People Walking Near Antenna ATSC DVB-8K ISDB-4K （From the presentation of the Brazilian SET/ABERT study group at NAB2000) 20 DiBEG Digital Broadcasting Experts Group 10 Summary of Comparison(1/2) Any improvement of digital receiver was not considered to make the table below. System conform to Requirements requirements Maximum bit rate under ATSC Gaussian noise environment Robustness against multi-path DVB-T, ISDB-T distortion Robustness against impulse ISDB-T noise Wide area single frequency DVB-T, ISDB-T network (SFN) operation 21 DiBEG Digital Broadcasting Experts Group Summary of Comparison(2/2) Any improvement of digital receiver was not considered to make the table below. System conform to Requirements requirements Mobility and Portability ISDB-T >> DVB-T Hierarchical transmission (Multiple modulation systems ISDB-T>> DVB-T simultaneously in the same channel is possible) System commonality with digital terrestrial sound broadcasting ISDB-T (One segment receiver is available) 22 DiBEG Digital Broadcasting Experts Group 11 3. Structure of ISDB-T Standard 23 DiBEG Digital Broadcasting Experts Group ARIB’s R&D and Standardization Demands for radio systems Technical Committee IMT-2000 Electromagnetic Study Environment R&D Group •••••• R&D Group Committee Committee Results of R&D Petition to the Ministry for rule making Rule making by the Ministry Draft ARIB Standard Demands for voluntary standards Standard Assembly ARIB Standard 24 DiBEG Digital Broadcasting Experts Group 12 Standardization for Broadcasters / Receivers (Broadcasters) (Receivers) •Service contents •Signal Interface •Segment utilization •Tuner characteristic •Transmission parameters •EPG •SI •Copy-right treatment •CAS •Hardware size •Network configuration •Interactive link •Down load data •Human interface •Test stream 25 DiBEG Digital Broadcasting Experts Group Toward Digital Broadcasting in Japan CS (SDTV) Digital CS (SDTV) 1996 Digital Wide-band CS (HDTV, SDTV) 2002 BS (SDTV) Digital BS (HDTV, SDTV) 2000 2011 Terrestrial TV (SDTV) Digital Terrestrial (HDTV, SDTV) Dec. 2003 Digital Terrestrial (Sound) Oct. 2003 Digital Satellite (Sound) Oct. 2004 26 DiBEG Digital Broadcasting Experts Group 13 Features of ISDB-T Technical Specification Japanese Requirements for DTTB OFDM Robustness, SFN Segment Structure Extensible, Partial Reception Time Interleaving Mobile Reception, Indoor Reception TMCC Flexible, Versatile 27 DiBEG Digital Broadcasting Experts Group Structure of Japan’s Digital Broadcasting system One segment handheld service Fixed/mobile service Source coding (any of service are available) MPEG-2 MPEG-AAC Data coding H.264 video Video coding Audio coding (note) coding Common interface (Transport Stream interface) Multiplex( Based on MPEG-2 systems) Mulitplex Common interface (Framed Transport Stream interface) Segmented OFDM Single carrier Single carrier QAM/DQPSK Transmission coding 8-PSK/PSK 64QAM With time interleave (satellite) (cable) (terrestrial) (note) both BML and MHP are available, But in Japan now BML is only service in.
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