Transcript S3_3 ShogenSb

NHK STRL
ABU Presented Session at Asia Media Summit 2011
24-25 May, 2011, Hanoi
Session 3: 2:30-4:00pm, 24 May 2011
Asia Media
Summit 2011
Enhanced DTV Systems:
Main features in Advanced ISDB-T
24 May, 2011
Kazuyoshi SHOGEN,
Kenichi Murayama and Yoshikazu Narikiyo
NHK Science and Technology Research Laboratories
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Contents
1. About NHK and NHK STRL
2. Concept of DTTB – Current (ISDB-T) and future
(Advanced ISDB-T = ISDB-Tn)
3. Future of fixed reception – Large capacity - SHV
4. Future of mobile reception – Stable reception of
HDTV
5. Technologies
Next generation
Number of generations
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NHK and NHK STRL
NHK (Nippon Hoso Kyokai, Japan Broadcasting Corporation)
 Sole public broadcaster in Japan
 Started Radio Service in 1925
 2 Terrestrial TV services, 2 Satellite TV services, 3 Radio
Services, Int. TV and R, and Video on Demand service
NHK Science and Technology Research Laboratories
 Established in 1930
 Developed HDTV, UHDTV,
satellite broadcasting system,
digital broadcasting system, ultra high
sensitivity camera, flexible display etc.
 Employees : 247 (incld 222 researchers, Dr. 85)
NHK STRL
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History of Broadcasting Innovation in Japan
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Current DTTB system in Japan
ISDB-T is
 the DTTB system developed in Japan.
 the robust system.
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OFDM
Frequency and Time-interleaving, etc
the flexible system.

Hierarchical transmission by segmented
OFDM
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HDTV / multi-SDTV service for fixed and mobile
One-Seg service for handheld
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Features of ISDB-T system
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The East Japan Great Earthquake
(2011 off the Pacific coast of Tohoku Earthquake)
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(2 min. 22 sec.)
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EEW : Earthquake Early Warning
EWBS : Emergency Warning Broadcasting System
MB86A35
Tuner Module
for ISDB-T
(6,7,8MHz)
w/EEW, EWBS
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Targets of ISDB-Tn
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Outline of UHDTV (Ultra High Definition TV)
(SHV : Super Hi-Vision)
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Image of Broadcasting Services by ISDB-Tn
Service image of
ISDB-Tn Mobile／ISDB-Tn Fixed
(2020～2025)
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Research toward ISDB-Tn
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Video of 2010 Open House of NHK STRL
(4 min. 13 sec.)
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Example of Transmission Parameters
(Demonstration in 2010 Open House of NHK STRL)
Bandwidth
5.57 MHz
Carrier modulation scheme
1024QAM
FFT size
8k (MODE3)
Guard interval ratio
1/8
FEC (Error Correction)
Inner Code: convolutional, r=3/4
Outer Code: RS(204,188)
Pilot signals
SP/CP: 8.3%
AC/TMCC: 2.7%
Transmission Capacity
30.4 Mbps (single polarization)
SP: Scattered Pilot
CP: Continual Pilot
AC: Auxiliary Channel
TMCC: Transmission and Multiplexing Configuration Control
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Handheld/mobile reception
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Technologies for handheld/mobile reception
SFBC(Space Frequency Block Code)
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Replace and encode two modulation data in the frequency division.
Tx#1 antenna sends the modulation data as it is.
Tx#2 antenna sends the encoded data.
h1
h2
Channel estimation
• Need to estimate the channel response before SFBC decoding.
• The h1 and the h2 are not the same. So, two channel responses must
be calculated.
• Estimate the channel response from the scattered pilot (SP: reference
signal) .
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Video of 2010 Open House of NHK STRL
(2 min. 4 sec.)
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Conclusion
1. Current DTTB (ISDB-T)
• Fixed reception of HDTV
• Mobile reception of One-Seg. (Important role in
emergency)
2. Concept of future DTTB (Advanced ISDB-T = ISDB-Tn)
 Future of fixed reception – Large capacity – SHV (Super
Hi-Vision)
• Expanding transmission capacity for next-generation
digital terrestrial broadcasting
 Future of mobile reception – Stable reception of HDTV
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Thank You for Your Attention
Kazuyoshi SHOGEN
Executive Research Engineer
NHK Science and Technology Research Laboratories
Project Manager of ABU T/EWBS
24 May, 2011
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