ISDB-T seminar(18th March. 2009) PresentationPresentation 22 TechnicalTechnical KeyKey featuresfeatures ofof ISDBISDB--TT andand EfficientEfficient transitiontransition toto DigitalDigital BroadcastingBroadcasting withwith ISDBISDB--TT 18th March. 2009 KBP ISDB-T Seminar Manila, Philippines DiBEG JAPAN TakashiTakashi YABASHIYABASHI (Director-General of Engineering Administration Department, NHK) DiBEG 1 Digital Broadcasting Expertsbroadcasting Group experts group Contents 1. Technical Key Features of ISDB-T System requirements from broadcasters System performance Results of comparison tests in foreign countries Applications in service 2. Efficient Transition to Digital Broadcasting with ISDB-T Preparation for transition to digital broadcasting Schedule for DTTB Digital transition in Japan with ISDB-T Requirements for future applications DiBEG 2 Digital Broadcasting Experts Group 1. Technical Key Features of ISDB-T DiBEG 3 Digital Broadcasting Experts Group System requirements from broadcasters Key items for consideration of digital terrestrial television Hi-Definition format in program production → HD format has become a major format in TV program, movies, video gaming software, etc. Frequency congestion → For efficient use of frequency spectrum, capability of Single Frequency Network (SFN) is required. Interference and fading in various environments → Tolerance to interference, multi-path signals, fading, etc. is required in various environments. Mobile reception with portable terminals such as cellular phones → No extra cost for mobile reception is preferable. Broadcasting service as a long term business → No extra cost for future demand from subscribers is DiBEG preferable. 4 Digital Broadcasting Experts Group SystemSystem PerformancePerformance ISDBISDB--TT isis ...... OneOne ofof thethe DTTBDTTB systemssystems inin thethe worldworld There are 3 systems recommended in ITU-R BT1306. ISDB-T, DVB-T and ATSC TheThe mostmost flexibleflexible systemsystem HDTV, multi-SDTV, EPG, data-casting, internet- access, mobile reception, cellular phone TV, etc. TheThe mostmost robustrobust systemsystem OFDM, time-interleaving, and segmentation. Brazilian and other countries' comparison test results proved it. DiBEG 5 Digital Broadcasting Experts Group Schedule for Digitalization in Japan ’25 ’53 ’84 ’00 ’03 ’07 ’11 Radio TV (Analog Terrestrial) I Satellite (Satellite Broadcasting) S D Digitalization B BS Digital 2000.12 Terrestrial Digital 2003.12 2011.07 Completion of Digitalization DiBEG 6 Digital Broadcasting Experts Group Transmission flexibility in ISDB-T Service 1 Service 2 Home Reception Mobile Home Mobile Mobile Reception Reception Reception Reception HDTV (Cellular (Cellular phone, etc) phone, etc) SDTV SDTV or ＋ Data Video, Video, ＋ Audio, ＋＋Data ＋ Data ＋ Audio, SDTV Data Data 2～3 5.6MHz （13 Segments） 5.6MHz （13 Segments） 64QAM QPSKQPSK QPSKQPSK QPSK Car Navigation Cellular Phone Mobile Receiver Home TV Receiver Receiver Receiver ） (HDTV, SDTV, Audio, Data) (All Services are receivable (Video, Audio, Data) (Video, Audio, Data) DiBEG Reception format depends on the receiver performance 7 Digital Broadcasting Experts Group What is interleaving ? Actual Data data Data 1 Data 2 Data 3 Data k Shuffle order of data Transmit after interleaving Transmitting Mass Data error data in specified area or frequency Reorder Deinterleave after receiving Received data Error Error Error Error Able to fix the mass data error Correction Correction Correction Correction by Interleaving !! Data after error correction Frequency or time duration DiBEG 8 Digital Broadcasting Experts Group Service lineup of ISDB-T in Japan ISDB-T has powerful applications HDTV Data broadcasting & Interactive TV TV station Internet/ telephone-line • High quality image on wide screen and CD quality sound. • Local news and weather forecast for • Offers Interactive service viewers at any time. Multi-channel program Mobile reception •Standard quality multi-channel service DiBEG • Transmission service to Mobile accesses 9 Digital Broadcasting Experts Group Examples of fixed reception service HighHigh DefinitionDefinition TelevisionTelevision ProgramProgram 9The high quality images on a 16ｘ9 wide screen and CD- quality sound make you feel as if you were at the theater. 9European broadcasters have opted for “multi-channel” strategy, but Japanese broadcasters have chosen to take advantages of “high definition” pictures. 9HDTV has become a killer application in both terrestrial broadcasting and satellite broadcasting . DiBEG 10 Digital Broadcasting Experts Group Examples of fixed reception service Multi-cannel SDTV program service ISDB-T can transmit multiple SD programs simultaneously on a single digital spectrum of 6 MHz. SDSD--11 SDSD--22 SDSD--33 Maximum number of Channel is 8 defined in Japanese ISDB-T DiBEG 11 Digital Broadcasting Experts Group Examples of interactive service (Electronic Program Guide) An Electronic Program Guide (EPG) is an interactive schedule of current and upcoming programs that a viewer can display on-screen simply by pressing a button on his remote control unit. DiBEG 12 Digital Broadcasting Experts Group Examples of interactive service (Data Broadcasting …No return link!) Data broadcasting is an interactive applications which provide various types of information. ISDB-T can provide various types of information without return links such as telephone lines, IP networks. → No additional cost for return link ! Weather forecast Traffic status DiBEG 13 Digital Broadcasting Experts Group Comparison Tests Results in Peru and Brazil DiBEG 14 Digital Broadcasting Experts Group Comparison Tests on Impulse Noise in Peru Blender Result of DVB-T Antenna ISDB-T Result of ATSC ISDB-T shows superiority in noise robustness. DiBEG 15 Digital Broadcasting Experts Group Mobile Reception Route in Peru C D B Av. Panamericana Norte Av. Universitaria 4.68 Km 5,20 Km F A Av. Angélica Inicio‐Fin Gamarra 2.24 Km E DiBEG 16 Digital Broadcasting Experts Group Results of Mobile Reception in Peru Test site Receiving antenna: Omni directional antenna (Total: Six routes) TV signals: HDTV Route ISDB-T DVB-T ATSC 1 (A-B) 5(5) 3 1 2 (B-C) 1(5) 1 1 3 (C-D) 3(5) 1 1 4 (D-E) 4(5) 1+ 1 5 (E-F) 4(5) 1+ 1 6 (F-A) 5(5) 3 1 Note: 5: Excellent, 4: good, 3:fair, 2: poor, 1: bad ( ) : Car TV (Strada, Panasonic) DiBEG 17 Digital Broadcasting Experts Group TestTest resultsresults carriedcarried outout byby BrazilBrazil Transmission parameter : almost same bit rate ATSC Fixed, 8VSB FEC=2/3 :19,39 Mbit/s DVB-T DVB-2K : 64QAM FEC=3/4 GI=1/16 2K :19,75 Mbit/s ISDB-T ISDB-4k : 64QAM 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) DiBEG 18 Digital Broadcasting Experts Group ImpulseImpulse noisenoise Relation between the noise pulse width & interference to signal ratio ATSC - Chip A 30 DVB - NDS - 3/4 1/16 2K 25 ISDB-T ISDB - NEC - 3/4 1/16 4K 0.1s 20 15 10 ATSC 5 "I"/C (dB) Better 0 -5 DVB-T -10 -15 0 100 200 300 400 Pulse width (μs) Better performance of the ISDB-T system, by introducing time interleaving (From the presentation of Brazilian SET/ABERT study group at NAB2000) DiBEG 19 Digital Broadcasting Experts Group StaticStatic multipathmultipath Carrier to noise ratio as a function of carrier to echo ratio Comparison at post-echo = 8 μs 36 34 ATSC - CHIP T 32 DVB - NDS - 3/4 1/16 2K 30 ATSC ISDB - CHIP J - 3/4 1/16 4k 0.1s 28 DVB-T Better 26 24 ISDB-T 22 C/N (dB) 20 18 16 14 024681012 D/U (dB) (From the presentation of Brazilian SET/ABERT study group at NAB2000) DiBEG 20 Digital Broadcasting Experts Group OutdoorOutdoor :: CoverageCoverage Success on Receiving - Cumulative Function Criterion: Number of Errors < 5 100% ISDB-T 90% DVB-T 80% Better 70% ATSC Percentage of Sites 60% 0 5 10 15 20 25 30 35 40 Distance (km) ATSC DVB-2k ISDB-T (From the presentation of Brazilian SET/ABERT study group at NAB2000) DiBEG 21 Digital Broadcasting Experts Group Applications in service - interactive service (with telecommunication link such as the Internet) With return links ISDB-T can provide various types of attractive online applications such as portal site, online games, online quizzes, and much more! → You can extend your business via return link. Online information menu: Travel, quizzes, book, etc TV program Broadcast Internet / Telephone line TV TV station Receiver NHK data online portal DiBEG 22 Digital Broadcasting Experts Group Applications in service - Convergence of Broadcasting & Mobile telecommunications - BST-OFDM technology / Features of One-Seg - BroadcastingConvergence Communications Watch TV TV & Data TV & Internet Internet Broadcasting station Broadcasting station ＢＭＬ ＢＭＬ ＢＭＬ, HTML Watching TV program Watching TV program Watching TV program Viewing or reading and reading data on and reading data on on full screen on the Internet TV the Internet DiBEG 23 Digital Broadcasting Experts Group Applications in service - Multi-channel service in One-Seg One-Seg 1 One-Seg 2 TOKYO MX homepage DiBEG 24 Digital Broadcasting Experts Group 2. Efficient transition to Digital Broadcasting with ISDB-T DiBEG 25 Digital Broadcasting Experts Group Preparation for transition to digital broadcasting NEWS Video server VTR Studio Digital relay circuit Closed Data Analog relay circuit EPG caption broadcast system Regional headquarter system system Regional station Circuit center Digital broadcasting ENC Digital Matrix switcher MUX transmitter Analog broadcasting D/C Analog transmitter Master control system (TV program delivery