THE BEST FIT DIGITAL TELEVISION STANDARD FOR THE PHILIPPINES
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1 ISDB T (Integrated Services Digital Broadcast Terrestrial) THE BEST FIT DIGITAL TELEVISION STANDARD FOR THE PHILIPPINES October 10, 2008 James Rodney P. Santiago Consultant ARIB/Digital Broadcast Experts Group
2 DIGITAL TELEVISION FOR THE PEOPLE, THE BROADCASTERS AND THE GOVERNMENT
3 State of broadcast and information in the country The Philippines is a tropical country that encounters a lot of natural calamities yearly, it can range from any of the following : Natural Calamities Typhoon Floods Earthquake Landslides Customized info Transportation Special announcements Sports Other events
4 ISDB T IS BEST FOR EVERYBODY
5 ISDB T s technology GOVERNMENT INFORMATION SYSTEM BROADCASTERS PEOPLE NDCC, PHILVOCS, PAGASA, DECS, MMDA, ETC. EWBS EMERGENCY WARNING BROADCAST SYSTEM PEOPLE ARE EMPOWERED!, Information received whenever, wherever necessary
6 Why the need for immediate information? 12mn 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12Nn 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am TRANSPORTATION INFORMATION SCHOOL INFORMATION WEATHER INFORMATION SPECIAL ANNOUNCEMENTS/EMERGENCIES (SEISMIC/TIDAL, VOLCANIC, TERRESTRIAL, FIRE, ETC.) PROBLEM : CURRENT INFORMATION DELIVERY IS INEFFICIENT, UNSYNCHRONIZED TO THE NEED OF THE PEOPLE ISDB-T WILL ENABLE A UNIFIED INFORMATION SYSTEM THAT CAN BE DELIVERED TO THE PEOPLE IMMEDIATELY!
7 TRAFFIC INFORMATION MMDA NATIONAL DISASTER COORDINATING COUNCIL DELIVER INFORMATION TO THE PEOPLE DEPARTMENT OF EDUCATION (DECS) PAGASA PHILVOCS
8 DIGITAL TELEVISION FOR THE BROADCASTERS
9 Solution for Nationwide Terrestrial Network Single Frequency Network (SFN)
10 Network Configuration SFN a technique that enables transmission on the same frequency within the same coverage without interference. a key feature in DTV. MFN a technique of providing coverage in a service area utilizing multiple frequencies, this technique is used in analog. a.k.a. Translator. In providing signal coverage in a particular service area, the following are the options in delivering content to various transmitter sites : 1. Microwave Distribution Network 2. Satellite 3. Broadcast Wave Relay 4. Dedicated Fiber link
11 Network Coverage using SFN Single Large Power Tx Multiple Low power TX Guard Interval * F1 * F1 * F1
12 Mega-Manila Slide 1
13 Guard Interval comparison. ISDB-T DVB-T Symbol Duration Symbol Duration Mode 1 Mode 2 Mode 3 2K 4K 8K GI Length 2.52E E E-03 GI Length 2.99E E E-03 1/ / / Distance (Kms.) 1/ Distance (Kms.) 1/ / / /
14 SFN Links In this design, Studio to Transmitter Links, Transmitter to Transmitter links and Broadcast Wave Relay configurations are used for distributing signals from the Broadcast Center. STL/TTL are simply microwave links used to connect two aoints. Broadcast Wave Relay is the same as Off the air pick up and redistribution of signal.
15 ISDB T s OPTIMIZED SFN UTILIZATION
16 SFN STL/Broadcast Wave Relay Block Diagram Studio Transmitting Station Broadcast Wave Transmitting Station Receiver Transmitter TS Remultiplexe r TS STL (Fiber) TS Signal Transmission TS OFDM Modulator IF Transmitter Compensating Equipment Transmitting Station Broadcast Wave Transmitting Station Receiver Transmitter TTL TS Signal Transmission TS OFDM Modulator IF Transmitter Compensating Equipment
17 Broadcast Wave Relay
18 Compensation Technologies
19 Problem of co-channel repeater (SFN)
20 Coupling Loop Interference canceller
21 adaptive antenna array for CLI canceller
22 Outside the Guard Interval Equalizer
23 OFDM parameters MODES Carrier Saacing 4Khz (250/63) 2Khz (125/63) 1Khz (125/126) Data Scattered ailots Continual ailots Number of Carriers TMCC ac ac Total QaSK QaSK QaSK Carrier Modulation Scheme 16QaM DQaSK 16QaM DQaSK 16QaM DQaSK 64QaM 64QaM 64QaM Symbols per frame 204 Effective symbol length 252uS 504uS 1008uS 63uS (1/4) 126uS 252uS (1/4) Guard Interval 31.5uS (1/8) 63uS 126uS (1/8) 15.75uS (1/16) 31.5uS 63uS (1/16) 7.875uS (1/32) 15.75uS 31.5uS (1/32) 34.26mS mS (1/4) mS (1/4) Frame Length mS mS (1/8) mS (1/18) ms mS (1/16) mS (1/16) mS mS (1/32) mS (1/32) IFFT sampling frequency 8.12Mhz ( 512/63) Inner code Convolutional Code (1/2, 2/3, 3/4, 45, & 7/8) Outer code Reed Solomon (204,188)
24 ISDB-T Slide Segments HIGH DEFINITION TELEVISION SERVICE 1 Segment, Mobile Television Service
25 ISDB-T s Slide Segmented 1 OFDM Hierarchical transmission 3 layer case 6 db 12dB 16QAM (Indoor antenna) QPSK (portable) 64QAM (Roof top antenna) as shown above, ISDB-T transmission system supports a maximum 3 reception style. Therefore, any of transmission system can be arranged according to the service concept in one frequency channel and one transmitter
26 ISDB-T s Slide Segmented 1 OFDM Examples of Broadcasting service by using Hierarchical transmission (1) Single layer multi-program for stationary reception. TV program 1 TV program N (1 transmitter) (2) 2 layers for HDTV and portable reception (same program) HDTV arogram Select any arogram QVGA (You can enjoy same TV program in any place) HDTV program (outside) (3) 3 layers for HDTV, SDTV and portable reception (same program) (in home) QVGa SDTV (outside) (indoor antenna) (roof toa antenna)
27 ISDB-T s Hierarchical Slide 1 Oaeration (Examale; 1seg + 12 seg) Layer a (LDTV,audio,Data) 13segments (6MHz bandwidth) Layer B (HDTV or Multi- SDTV with Data)) frequency QPSK constellation Difference of required C/N Between 64QaM and QaSK is about 12 db 64QAM constellation *13 segments are divided into layers, maximum number of layers is 3. *any number of segment for each layers can be selected (totally 13 segment) *Transmission parameter sets of each layer can be set independently (In above example, modulation index of each layer are different)
28 ISDB T is best for the Broadcaster, the Government and the People!
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