• Broadcasting and Media Magazine
• /
• v.8 no.1
• /
• pp.98-107
• /
• 2003

위성 DMB는 위성을 통해 고품질 오디오와 데이터, 영상서비스 등을 제공하고 이동성을 갖는 차량 및 휴대 수신기를 통하여 서비스를 제공받게 된다. 본고에서는 IUT-R 권고에 따르는 시스템 A, DH, E 방식에서 수신기에 이동성을 제공하기 위하여 필요한 갭필러(Gap Filer)를 구성하는 방식과 특징에 대하여 살펴보고 시스템 E 방식에서의 갭필러에 대하여 필요한 사양과 구현에 대하여 기술하고 셀 설계시의 고려사항에 대하여 설명한다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.17 no.9 s.112
• /
• pp.866-873
• /
• 2006

In this paper, we proposed and fabricated the single-feed dual-band circular patch antenna for S-DMB(Satellite-Digital Multimedia Broadcasting) and ITS(Intelligent Transport Systems) services. The manufactured dual-band antenna showed that the measured -10 dB bandwidth and the minimum return loss was 90 MHz and -35 dB for S-DMB, 180 MHz and -18 dB for ITS, respectively. It is noticed that the measured and the simulated results are agreed well. And the antenna gain of S-DMB and ITS has 2.3 dBi and 2.7 dBi, respectively.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2015.10a
• /
• pp.283-285
• /
• 2015

위성항법보정시스템 이용 분야의 현황을 파악 및 분석하여 지상파 DMB 등으로 활용분야를 확대하여 해양교통 분야 및 육상의 다양한 분야에서 이용할 수 있는 방안을 연구함.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.13 no.5
• /
• pp.221-227
• /
• 2013

In this paper, Satellite DMB/WiBro antenna and PCS/WiBro antenna improving indoor coverage for mobile services are designed and fabricated. Satellite DMB/WiBro bands repeater antenna and PCS/WiBro bands repeater antenna are proposed as a simple radiator with loading capacitor to generate LHCP(Left Hand Circular Polarization). The proposed antenna for Satellite DMB/WiBro and PCS/WiBro bands communication are fabricated by copper plate uploader type and substrate uploader type. The designed and fabricated antenna has a bandwidth of 70MHz at 1.816GHz~1.886GHz and bandwidth of 107MHz at 2.247GHz~2.354GHz. Maximum gain of radiation pattern was up to 5dBi.

• Journal of Satellite, Information and Communications
• /
• v.7 no.3
• /
• pp.58-62
• /
• 2012

Emergency alerting broadcasting of T-DMB is being serviced to deliver the event of a disaster to the people quickly and effectively through a T-DMB network. DGPS has been developed in order to improve the accuracy of the GPS receiving data and transmitting of DGPS information through the T-DMB network is being studied for a wide range of usage. Because DGPS information and AEAS message are sent through the same T-DMB network, if DGPS information is applied to AEAS message disaster area can be specified more precisely and the exact location of the disaster can be measured in the terminal. In this paper, a implementation method of T-DMB emergency alerting broadcasting system based on a DGPS including a new structure of AEAS message was proposed to identify the location of disaster accurately.

• Journal of Satellite, Information and Communications
• /
• v.8 no.2
• /
• pp.22-28
• /
• 2013

In this paper, new LBS (location based service) are proposed using conventional DMB (digital multimedia/mobile broadcasting) system. LBS applications are proposed that can be suitable for the subway and ground transportation based on S-DMB (satellite-DMB) and T-DMB (terrestrial-DMB) respectively. In the shaded area such as subway, the broadcasting signal transmitted from the satellite of S-DMB system should be retransmitted by the earth repeater called the gap filler and each gap filler has its own identification value called the gap filler ID which introduces the area in which the gap filler was installed. Therefore, the LBS can be implemented by using the gap filler ID of S-DMB on the subway in which the GPS (global positioning system) can't be received. Unlike the LBS on the subway, the combination of T-DMB and DGPS (differential GPS) will be introduced as a way for ground transportation. Generally, DGPS has been designed to compensate the position value calculated from the GPS signal so that positioning error of about 1 meter can be obtained by using DGPS information. T-DMB system transmitting DGPS signal will be expected to be commercial in Korea and, if using DGPS information transmitted through T-DMB network, LBS with more precise positioning than GPS alone can be implemented in the ground vehicles.

• TTA Journal
• /
• s.92
• /
• pp.103-108
• /
• 2004

• TTA Journal
• /
• s.104
• /
• pp.23-26
• /
• 2006

위성 DMB 및 지상파 DMB 기술표준 개발 및 제정업무를 담당하고 있는 DMB PG는 2004년 3월 11일 TTA의 조직개편으로 DMB PG(PG307)라는 명칭을 사용하고 있으며, 이전에는 음성방송연구반이었다. DMB 관련 업무는 2003년 6월 13일에 개최된 음성방송연구반 제 18차 회의 때부터 개시되어 2004년 3월 11일 DMB PG가 출범하기까지 총 32차 회의까지를 개최하며 수행되었고, 2004년 3월 11일 DMB PG로 새롭게 출범한 이후 2006년 3월 15일까지 총 42차 회의를 개최하여, 약 3년 6개월이라는 기간 동안 총 74차의 회의를 개최하며 DMB 표준화 업무를 수행해 오고 있다

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.9 no.5
• /
• pp.1279-1283
• /
• 2008

Satellite Digital Multimedia Broadcasting(SDMB) needs Gap Fillers(GFs) to cover the non-service areas. However, SDMB mobile phones which are not located in GFs service area receive signals directly from the satellite because it is impossible to cover all SDMB service with GFs. Therefore, there is a border between the GFs service coverage and the satellite service coverage and it causes a time delay in signals which are from the GFs or the satellite. The time delay is the reason why SDMB service deteriorates. In this paper, I show how to reduce the deterioration of SDMB service in the border area between the GFs and the satellite adding the time delay to the satellite signal and the GFs signal. I think that this method is helpful in reducing the deterioration, especially in the early stages of SDMB service, which the GFs are not spread all over the nation yet.

• Journal of the Korea Society of Computer and Information
• /
• v.10 no.2 s.34
• /
• pp.169-177
• /
• 2005

The Conditional Access System is a complete system for ensuring that broadcasting services be accessible to only those who are entitled to receive them. Secure key management and efficient delivery mechanism are very important design factors to this system. In this paper, we propose secure and efficient protocols which would be well fitted to a Pay TV system including the satellite DMB. Further. by applying our protocol to the existing conditional access system, we propose a new system that properly enables the control of conditional access to the Pay TV in satellite DMB environment.