• 정보화사회
• /
• s.177
• /
• pp.62-63
• /
• 2005

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2007.06a
• /
• pp.856-860
• /
• 2007

In this paper, we propose a microstrip antenna with sufficient impedance bandwidths and gains for the 2.65GHz antenna which used in the satellite digital multimedia broadcasting. The proposed 2.65GHz S-DMB bandwidth microstrip antenna on a substrate, which is small enough to be installed in practical mobile phones, and described simulation feature using by CST Microwave Studio program. The measured result is similar with commercial antenna and acceptable frequency band is found that more wide than the existing products.

• Journal of Broadcast Engineering
• /
• v.11 no.3 s.32
• /
• pp.302-310
• /
• 2006

ITU-R B.O. 1130-4 Digital System E adopted for Korean satellite DMB service is a multimedia broadcasting system based on DS-CDM-QPSK technique which broadcasts audio and video contents via the satellite or terrestrial gap-filler. However, Digital System E can not provide full loading services because the multi-channel interference (MCI) is increased due to the loss of orthogonality between signature waveforms in multipath fading channels. In this paper a chip equalizer using tap selection algorithm that enhances the receiving performance is proposed and compared to the conventional rake receiver for the satellite DMB system.

• Journal of Broadcast Engineering
• /
• v.10 no.3
• /
• pp.372-382
• /
• 2005

DS/CDM-QPSK (ITU-R Recommendation BO.1130-4 Annex 6, 'Digital System E'), which has been adoptedas a standard of Korean Satellite DMB (Digital Multimedia Broadcasting) system, is a satellite-based multimedia broadcasting service which transmits the multi-channel and high quality contents to the terrestrial users through a satellite or gap-fillers. The broadcast from a satellite is directly received in the plain terrain which are within line-of-sight, but in cities where the broadcast cannot be received directly due to the shadow of buildings, an attempt is being made to install 'Gap-Fillers' to improve the reception in those areas. The gap-fillers, however, may induce interference to service of adjacent band, when their output power is substantially higher compared to the received signal power of signal from a satellite of the adjacent service. In this paper, a link budget analysis is performed, and the optimal EIRP of a gap-filler to maximize the gap-filler coverage, while preventing adjacent band interference is derived.

• Satellite Communications and Space Industry
• /
• v.11 no.1 s.26
• /
• pp.44-49
• /
• 2003

• Electronics and Telecommunications Trends
• /
• v.23 no.3
• /
• pp.106-118
• /
• 2008

본 고에서는 최근 표준화가 완료된 MPEG-A(ISO/IEC 23000) Part 9 DMB-AF의 표준화 배경 및 서비스 모델을 소개하고 기술적인 구성요소에 대해 설명한다. DMB-AF는 MPEG-4 Part 12 ISO Base Media File Format에 기반한 DMB 콘텐트 전용 파일 포맷으로, 다양한 종류의 지상파 DMB 및 위성 DMB 콘텐트를 체계적으로 표현하고 효과적으로 저장 및 접근하며 안전하게 보호/유통하기 위한 기술들이 포함되어 있다. 이러한 DMB-AF 표준은 다양한 DMB 콘텐트들을 적절히 연계하여 방통융합 환경에서 다양한 비즈니스 기회를 창출할 수 있는 공통의 프레임워크를 제공할 뿐 아니라, 저장매체를 매개로 하여 사용자가 원하는 시점에 원하는 프로그램을 원하는 장치에서 시청할 수 있도록 하는 DMB-Anytime 서비스를 가능하게 한다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.17 no.7 s.110
• /
• pp.665-672
• /
• 2006

In this paper, we propose and fabricate the dual-band microstrip patch antenna with parasitic patch for S-DMB(Satellite-Digital Multimedia Broadcasting) and ITS (Intelligent Transport System) services. The measured - 10 dB bandwidth and the minimum return loss is 300 MHz and - 27 dB for S-DMB, 600 MHz and -17 dB for ITS, respectively. It is noticed that the measured and simulated results are agreed well. The S-DMB antenna has conical beam pattern in the vertical plane and has omni-directional beam pattern in the horizontal plane. The conical beam pattern has the maximum gain about 4.2 dBi when ${\theta}$ is $45^{\circ}$ at the center frequency of 2.6 GHz. The ITS antenna has directional beam pattern in the vertical plane that has maximum gain about 6.4 dBi when ${\theta}$ is $0^{\circ}$ at the center frequency of 5.8 GHz.

• Digital Contents
• /
• no.3 s.130
• /
• pp.74-75
• /
• 2004

디지털 멀티미디어 방송, DMB 도입을 위한 방송법 개정안의 국회 처리가 사실상 무산됐다. 사실상 이번 임시국회내 마지막 상임 위 전체회의가 가능한 25일 회의 개최를 합의하지 못해 방송법 개정이 불가능해져 이번 회기 내 방송법 개정안 처리가 불투명해졌다. 이에 이달 발사 예정이던 DMB용 위성은 공회전이 불가피해졌고, DMB 관련 업체들은 심각한 경영 타격을 입게됐다.

• Korean Management Science Review
• /
• v.23 no.3
• /
• pp.41-61
• /
• 2006

This study is to propose a sales forecasting framework for new products in the prelaunch phase where no saies data are available. For the purpose we first develop an extended Bass model with the dynamic market potential and then propose an estimation method based on the market survey and scenario methodology. The proposed parameter estimation method is different from previous studies in that most of them have only Proposed the management judgments or analogies. We also apply the proposed model to satellite DMB market in Korea to verify the model.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.4 no.1
• /
• pp.46-52
• /
• 2009

This paper design QHA(quadrifilar helical antenna) to receive efficiently Satellite-Digital Multimedia Broadcasting video signal. It is designed as quadrifilar structure with phase variation $0^{\circ}C$, $90^{\circ}C$, $180^{\circ}C$, $270^{\circ}C$ to obtain circular polarization. Upper gap, turn number and height of QHA are varied to obtain optimization dimensions. Optimization dimensions are gap=2.2mm, turn number=0.9, height=42mm and input reflection coefficient is approximately -5.8dB. Designed QHA can be applied to Satellite-DMB terminal.