Presentation 2 Technical Aspect of ISDB-T system and Hardware Feb. - PowerPoint PPT Presentation

Ｄ ｉ Ｂ Ｅ Ｇ Ｄ ｉ Ｂ Ｅ Ｇ D i g i t a l B r o a d c a s t i n g D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p E x p e r t s G r o u p Presentation 2 Technical Aspect of ISDB-T system and Hardware Feb. 12, 2003 TVRI seminar in Jakarta Yasuo Takahashi Director of DiBEG Seminar working Group (Toshiba)

Ｄ ｉ Ｂ Ｅ Ｇ D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p Contents •What’s ISDB-T? -ISDB-T is , -Requirements/Solutions, -ISDB family, -Technical solutions, -Parameters of ISDB-T system •Why ISDB-T now? -comparison of 3 DTTV systems, -Results of comparison test in Brazil, - DTTV selection guide, -Conclusion •How ISDB-T developed? -Pilot test in Japan, -Development of mobile receiving technology, -Proto type of Digital Audio/one segment receiver •ISDB-T now in Japan (Commercial type receiver)

Ｄ ｉ Ｂ Ｅ Ｇ D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p What’s ISDB-T ? -ISDB-T is -Requirements/Solutions -ISDB family -Technical solutions -Parameters of ISDB-T system

Ｄ ｉ Ｂ Ｅ Ｇ D i g i t a l B r o a d c a s t i n g ISDB-T is ・ ・ ・ ・ E x p e r t s G r o u p • 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 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

Ｄ ｉ Ｂ Ｅ Ｇ D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p Market Requirements for ISDB-T • HDTV and Multi SDTV • Multimedia Service • Mobility and Portability • Flexible/Versatile • Data Broadcasting • Effective Spectrum Utilization • Commonality of Receiver

R e q u i r e m e n ｓf f o rD D i g i t i z a t i o n →S S o l u t i o n s R e q u i r e m e n ｓ o r i g i t i z a t i o n → o l u t i o n s Ｄ ｉ Ｂ Ｅ Ｇ D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p - H D T V 1 C H o r S D T V 3 C H w i t h i n 6 M H z b a n d . H i g h - Q u a l i t y , M u l t i - C h a n n e l s - R o b u s t n e s s a g a i n s t m u l t i - p a t h M u l t i m e d i a - S e r v i c e - I n t e g r a t e d S e r v i c e ( V i d e o / A u d i o / D a t a ) - H i g h q u a l i t y D a t a S e r v i c e F l e x i b l e / V e r s a t i l e - B i - d i r e c t i o n a l S e r v i c e E f f i c i e n t S p e c t r u m S i n g l e F r e q u e n c y N e t w o r k ( S F N ) u t i l i z a t i o n - R o b u s t n e s s a g a i n s t m o b i l e / p o r t a b l e r e c e p t i o n M o b i l e a n d p o r t a b l e - B o t h f i x e d / m o b i l e s e r v i c e w i t h i n s a m e b a n d s e r v i c e ( T e r r e t r i a l ) →L a y e r T r a n s m i s s i o n T e c h n o l o g y C o m m o n a l i t y o f - C o m m o n a l i t y f o r B S / C a b l e / T e r r e s t r i a l r e c e i v e r B r o a d c a s t i n g .

Ｄ ｉ Ｂ Ｅ Ｇ D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p Layered Structure for Digital Broadcasting Video Audio Data Application Layer Encode Encode Encode Commonality Interoperability ↓ Multiplex MPEG-2 Standard MPEG-2 MPEG-2 Transmission Layer FEC/Interleaving Optimized for each transmission system ↓ Modulation Satellite/Terrestrial/Cable

Ｄ ｉ Ｂ Ｅ Ｇ D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p ISDB Family Satellite(ISDB-S) MPEG-2 Error correction Modulation RS(204,188) Coding TC-8PSK Video Cable(ISDB-S) Error correction Modulation RS(204,188) Coding 64QM Audio Multiplexing Terrestrial(ISDB-T) Error correction Modulation Coding RS(204,188) Data Segmented OFDM + Conv. code Package, communication and Other media (DVB and ATSC) MPEG-2 TS

Ｄ ｉ Ｂ Ｅ Ｇ D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p Technical Solution for transmission layer of DTTV -ISDB-T • OFDM – Robustness, SFN (Single Frequency Network) • Segmented Structure – Extensible, Partial Reception • Time Interleaving – Mobile Reception, Indoor Reception • TMCC ( Transmission and Multiplexing Configuration Control ) – Flexible, Versatile

Ｄ ｉ Ｂ Ｅ Ｇ D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p Transmission Scheme • Band Segmented Transmission OFDM • Bandwidth of an OFDM-Segment: • 6/14MHz (428.6kHz) or 8/14MHz (571.4kHz) • Number of OFDM Segments: 13

Ｄ ｉ Ｂ Ｅ Ｇ p Segmented Structure and D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u Partial Reception 6MHz or 8MHz

Ｄ ｉ Ｂ Ｅ Ｇ D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p Transmission Scheme • Band Segmented Transmission OFDM • Bandwidth of an OFDM-Segment: • 6/14MHz (428.6kHz) or 8/14MHz (571.4kHz) • Number of OFDM Segments: 13 • Partial Reception – One-segment ISDB-T receiver can receive a centered segment of ISDB-T signal.

Ｄ ｉ Ｂ Ｅ Ｇ p Segmented Structure and D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u Partial Reception

Ｄ ｉ Ｂ Ｅ Ｇ Transmission Scheme D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p • Band Segmented Transmission OFDM • Bandwidth of an OFDM-Segment: • 6/14MHz (428.6kHz) or 8/14MHz (571.4kHz) • Number of OFDM Segments: 13 • Partial Reception – One-segment ISDB-T receiver can receive a centered segment of ISDB-T signal. • Hierarchical Transmission – Three layers – Modulation, Coding rates, Length of Time interleaving

Ｄ ｉ Ｂ Ｅ Ｇ Segmented Structure and Partial D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p Reception Sound / Data HDTV An Example of Layer A Layer B Hierarchical Multiplexing 64QAM 16QAM Parameter 3/4 1/2 12 segments 1 segment Bit rate 16.9 Mbps 630 kbps

Ｄ ｉ Ｂ Ｅ Ｇ D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p Three Mode of ISDB-T Mode1(2K) Mode2(4K) Mode3(8K) DQPSK Mobile Mobile SDTV & QPSK Fixed 16QAM Fixed HDTV/SDTV HDTV/SDTV 64QAM TMCC can change the mode any time to any combination.

Ｄ ｉ Ｂ Ｅ Ｇ Parameters of ISDB-T D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p (6MHz Bandwidth) ISDB-T Mode Mode 1 Mode 2 Mode 3 No. of OFDM Segment 13 5.575MHz 5.573MHz 5.572MHz Useful Bandwidth 3.968kHz 1.984kHz 0.992kHz Carrier Spacing 1405 2809 5617 Total Carriers Modulation DQPSK, QPSK, 16QAM, 64QAM 252 μ sec 504 μ sec 1,008 μ sec Active Symbol Duration Guard Interval Duration 1/4 , 1/8 , 1/16 , 1/32 of Active Symbol Duration No. of Symbols per Frame 204 Time Interleaving 0, 0.125, 0.25, 0.5sec Inner Coding Convolutional Code (1/2, 2/3, 3/4, 5/6, 7/8) Outer Coding RS(204, 188) 3.65Mbps ～ Useful Bit Rate 23.23Mbps Hierarchical Transmission up to Three Layers

Ｄ ｉ Ｂ Ｅ Ｇ Parameters of ISDB-T D i g i t a l B r o a d c a s t i n g E x p e r t s G r o u p (8MHz Bandwidth) ISDB-T Mode Mode 1 Mode 2 Mode 3 No. of OFDM Segment 13 7.434MHz 7.431MHz 7.430MHz Useful Bandwidth 5.291kHz 2.645kHz 1.322kHz Carrier Spacing 1405 2809 5617 Total Carriers Modulation DQPSK, QPSK, 16QAM, 64QAM 189 μ sec 378 μ sec 756 μ sec Active Symbol Duration Guard Interval Duration 1/4 , 1/8 , 1/16 , 1/32 of Active Symbol Duration No. of Symbols per Frame 204 Time Interleaving 0, 0.125, 0.25, 0.5sec Inner Coding Convolutional Code (1/2, 2/3, 3/4, 5/6, 7/8) Outer Coding RS(204, 188) 4.87Mbps ～ Useful Bit Rate 30.98Mbps Hierarchical Transmission up to Three Layers