• Journal of Broadcast Engineering
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• v.15 no.1
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• pp.122-132
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• 2010

AT-DMB system has been developed to increase data rate up to double of conventional T-DMB in the same bandwidth while maintaining backward compatibility. The AT-DMB system adopted hierarchical modulation which adds BPSK or QPSK signal as enhancement layer to existing DQPSK signal. The enhancement layer signal should be small enough to maintain backward compatibility and to minimize the coverage loss of conventional T-DMB service coverage. But this causes the enhancement layer signal of AT-DMB susceptible to fading effect in transmission channel. A turbo code which has improved error correction capability than convolutional code, is applied to the enhancement layer signal of the AT-DMB system for compensating channel distortion. However there is a need for other solutions for better reception of AT-DMB signal in receiver side without increasing transmitting power. In this paper, we propose adaptive array antenna system with Eigen-space beamforming algorithm which benefits beamforming gain along with diversity gain. We analyzed the reception performances of AT-DMB system in indoor and mobile environments when this new smart antenna system and algorithm is introduced. The computer simulation results are presented along with analysis comments.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.6A
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• pp.488-498
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• 2005

The DAB(Digital Audio Broadcasting) service which is based on the Eureka-147 of Europe is developed to DMB(Digital Multimedia Broadcasting) service that is divided into Terrestrial DMB and Satellite DMB. The Satellite DMB is a new broadcasting service, which will service multi-channel multimedia broadcasting by the portable receiver or the vehicle receiver. In this paper, we consider that link level performance of satellite DMB system A which is based on the COFDM(Coded Orthogonal Division Multiplexing). It uses the OFDM method which is sensitive to nonlinearity, so we analyze the effect of the HPA(High Power Amplifier) nonlinearity. And then we define the appropriate back-off value by performing the link level simulation considering back-off effect. Also we consider the effect of frequency and time offset, and then confirm the overall link level performance by analyzing and verifying a suitable synchronization method for satellite DMB system A.

• Journal of Broadcast Engineering
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• v.16 no.3
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• pp.542-551
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• 2011

Recently an extension to DMB-AF (Digital Multimedia Broadcasting Application Format) standard was proposed in [1] without sufficient validation for industrial application due to incomplete implementation. The extended DMB-AF can include stereoscopic video and stereoscopic images for interactive service data, i.e., MPEG-4 BIFS data, in addition to the existing 2D video and 2D images for BIFS services. The contents in the extended DMB-AF can provide a temporal mixture of 2D/3D video presentations possibly with or without 2D/3D images for BIFS services. In this paper we developed DMB-AF player software that can play the extended DMB-AF files and authored several test files for its verification. As a result, we introduced a new method for indicating dependencies of 3D media tracks to improve the extension in [1] and validated the extended DMB-AF with the improvement.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.10
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• pp.1065-1074
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• 2008

T-DMB(Terrestrial Digital Multimedia Broadcasting) system, is based on the Eureka-147 standard, provides various multimedia data services. However T-DMB system needs upgrades for more various services and better services. Therefore, we proposed advanced T-DMB system using unequal error protection system and hierarchical modulation in this paper while maintaing backward compatibility. And we simulated various bit split methods and double binary turbo code of DVB-RCS standard as method of LP data stream for additional service of advanced T-DMB. As the simulation results, double binary turbo code of proposed advanced T-DMB system have each coding gain of over 2 dB compared to conventional T-DMB.

• Journal of Satellite, Information and Communications
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• v.6 no.2
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• pp.15-19
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• 2011

The T-DMB(Terrestrial Digital Multimedia Broadcasting) which was developed by the convergence of digital broadcasting technology and communication technology provides us with very good quality of music like CD, and provides TV services in a super express train like the KTX whose velocity is over 300 Km per hour. The T-DMB is diffusing toward the world as a technology which is be able to provide the various convergent services of broadcasting and communication through mobile phone, PDA, dedicated terminal, and so on. A business model needed for the diffusion of the T-DMB toward the world was established and utilized to expand the T-DMB into Vietnam in the paper. In addition, this paper describes not only some predicting methods for the technological valuation of the T-DMB Total Solution, but also a case study on the marketing related to establishing the T-DMB system in order to provide the paid services in Vietnam. Finally, A couple of business models needed to globally expand the T-DMB have been provided.

• Digital Contents
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• no.11 s.138
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• pp.48-49
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• 2004

‘통신과 방송의 융합’이라는 새‘테제’를 가장 앞서 충족할 DMB 서비스가 본격화하면서 통신사업자들과 방송사들의 발걸음이 빨라졌다. 위성DMB 서비스를 준비중인 티유미디어는 위성DMB사업자 선정을 앞두고 이동형 · 개인형 방송이라는 위성DMB만의 차별화에 총력을 쏟고 있다. 디지털방송 시대의 도래, 방송시장의 확대 등 방송환경의 변화로 인해 개인형 · 이동형 멀티미디어 방송으로 라이프스타일을 변화시키겠다는 꿈을 꾸며 위성DMB사업을 준비하고 있는 티유미디어를 찾았다.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.845-848
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• 2006

In this paper, a ETI management system for a variety of media services based on Terrestrial-Digital Multimedia Broadcasting(T-DMB) is introduced. This system consists of DMB I/O board and DMB multiplexer. The system transforms media data stream over IP(TCP/IP or UDP/IP) for these services to ETI frame(G.703) pushed to T-DMB transmitter.

• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.612-617
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• 2008

To develop the broadcasting application for DMB, the programmers have to aggregate the content. In this case of content such as news, it would be hard to provide successively updated content. This paper introduces a creation system which can automatically create the news application for data broadcasting on DMB based on the web news content updated immediately. The designed creation system aggregates the news content using RSS based XML and produces the news application by transcoding the web content which can be applied on DMB.

• Broadcasting and Media Magazine
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• v.14 no.3
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• pp.47-57
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• 2009

최근 DMB (Digital Multimedia Broadcasting)서비스 활성화를 위한 맞춤시청형 DMB 방송 서비스를 제공하기 위해 한국정보통신기술협회 (TTA)에서는 DMB ECG (Electronic Content Guide) XML (eXtensible Markup Language) 표준의 재정 및 개정 작업을 완료하였다. 한국전자통신연구원 (ETRI) 에서는 DMB ECG XML 표준 및 DMB ECG 서비스의 유효성 검증을 위해 DMB ECG 메타데이터의 저작 단계에서 단말단의 소비에 이르는 맞춤시청형 DMB 시스템을 개발하였다. DMB ECG 메타데이터는 맞춤시청형 방송 서비스 제공을 위해 서브시스템 사이에 전달되는 핵심 요소로서 이를 저작, 관리 및 전송하기 위한 새로운 시스템이 요구된다. 본 논문에서는 DMB ECG XML 표준의 소개와 맞춤시청형 DMB 시스템의 전체 구조 및 메타데이터의 관리를 위한 서브시스템의 세부 구조와 기능에 대해 기술한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.06a
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• pp.237-238
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• 2013

기존의 T-DMB 방송은 기본적인 오디오/비디오 서비스와 함께 BWS, Slideshow, TPEG 등과 같은 다양한 형태의 부가데이터 서비스를 제공할 수 있다. 그리고 최근 성공적인 AT-DMB 시험방송과 더불어서 DMB-ECG, DMB 파일캐스팅, 맞춤형 DMB 서비스 등과 같은 다양한 메타데이터 규격을 활용한 고품질의 부가데이터 서비스 표준화가 완료되었다. 본 논문에서는 고품질의 부가데이터 서비스의 일환인 후각기반 감성미디어 서비스 제안하고, DMB 데이터채널을 통한 시그널링 정보 송수신 방법과 기존의 DMB 소비단말과의 역호환성을 고려한 감성미디어 DMB 소비단말 구조를 제안한다.