Development of T-DMB system for mobile multimedia broadcasting service
ABSTRACT We show the framework of the Korean terrestrial digital multimedia broadcasting (T-DMB) standard and propose the architecture of a new T-DMB system for mobile multimedia broadcasting services. We also designed and implemented a new device called the ensemble remultiplexer to verify the proposed T-DMB transmission system.
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ABSTRACT: In this paper we propose an on-glass antenna which consists of conducting dual center striplines and multi-loaded striplines. Multi-loaded striplines and dual center lines were employed for achieving a broad matching bandwidth and improving a vertical radiation gain, respectively. The detail design parameters were determined using the Pareto genetic algorithm with an full wave EM simulator. The optimized design was built and installed on a commercial vehicle, and the antenna performances such as the return loss and the radiation gain were measured in a semi-anechoic chamber. The measurement results showed the matching bandwidth(The Journal of Korean Institute of Electromagnetic Engineering and Science. 01/2009; 20(7).
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ABSTRACT: In this paper, inverted-F and whip antenna combination for terrestrial digital multimedia broadcasting (T-DMB) communication with notebook computer is presented. An inverted-F antenna (IFA) was designed as an internal antenna for 200 MHz band (Korea T-DMB operating frequency band). The IFA can be modified to a whip antenna in weak-receiving signal area. The simulation and measurement results show that the IFA and whip antenna combination can cover Korea T-DMB frequency range on notebook computer. The real T-DMB reception test was performed. The bit error rate (BER) of the proposed antenna configuration is compared to the BER of external quarter wave-length whip antennaMicrowave Conference, 2006. 36th European; 10/2006
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ABSTRACT: Fast developments of broadcasting technologies since 1990s enabled not only High Definition Television service providing high quality audiovisual contents at home but also mobile broadcasting service providing audiovisual contents to high speed moving vehicle. Terrestrial Digital Multimedia Broadcasting (T-DMB) is one of the technologies developed for mobile broadcasting service, which has been successfully commercialized. One of the major technical breakthroughs achieved by T-DMB in addition to robust vehicular reception is an adoption of framework based on MPEG-4 System. It naturally enables integrated interactive data services by using Binary Format for Scene (BIFS) technology for scene description and representation of graphics object and Object Descriptor Framework representing multimedia service components as objects. T-DMB interactive data service has two fundamental limitations. Firstly, graphic data for interactive service should be always overlaid on top of a video not to be rendered out of it. Secondly, data for interactive service is only received by broadcasting channel. These limitations were considered as general in broadcasting systems. However, they are being considered as hard limitations for personalized data services using location information and user characteristics which are becoming widely used for data services of smart devices in these days. In this paper, the architecture of T-DMB hybrid data service is proposed which is utilizing broadcasting network, wireless internet and local storage for delivering BIFS data to overcome these limitations. This paper also presents hybrid BIFS technology to implement T-DMB hybrid data service while maintaining backward compatibility with legacy T-DMB players.Journal of Broadcast Engineering. 01/2011; 16(2).