• Title/Summary/Keyword: AT-DMB

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The Development of Multimedia Player Platform for Terrestrial Digital Multimedia Broadcasting (DMB) (지상파 이동 멀티미디어방송용 멀티미디어 재생기 개발)

  • 기명석;서정일;강경옥
    • Journal of Broadcast Engineering
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    • v.8 no.4
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    • pp.465-472
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    • 2003
  • In this paper we propose the structure of MPEG-4 multimedia player platform for Terrestrial Digital Multimedia Broadcasting (DMB) Service. Korea will launch DMB service at next 2004 you based on Eureka-147 Digital Audio Broadcasting (DAB) Service System. This new mobile multimedia broadcasting services provide not only high quality digital audio broadcasting services, but also various multimedia data broadcasting services including high quality video. For the sake of MPEG-4 Systems technologies, it will provide an interactive service to users in the near future. Therefore it terminal shall have various functionalities as well as playing audio-visual contents. However there is no precedence standard for such mobile interactive multimedia broadcasting system. Therefore it is very import to provide the multimedia player platform of DMB service for accelerating the development process of commercial terminal and providing a direction of next DMB terminal structure.

Efficient Solution for deployment of T-DMB Infra at Subway and Railroad (지하철 및 철도 구간에서의 효율적인 지상파DMB 인프라 구축방안)

  • Kim, Hyoung-Won;Choi, Kwang-Ho
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.616-623
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    • 2006
  • As we have understood the commonly launched T-DMB service from December 2005, we kindly recommend to apply LCX cable installing solution which can be covering underground subway and tunnel T-DMB signal shadow area with most efficient network implementation method. Subway passengers would be enjoyable continuous T-DMB services through LCX cable installing solution.

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An effective error resilience coding of MPEG-4 video stream using DMB system (DMB를 통한 MPEG-4 비디오 스트림의 효율적인 오류 내성부호화 방안)

  • 백선혜;나남웅;홍성훈;이봉호;함영권
    • Proceedings of the IEEK Conference
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    • 2003.07e
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    • pp.2060-2063
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    • 2003
  • Terrestrial DMB(Digital Multimedia Broad-casting) system that is now under standardization in Korea offers multimedia broadcasting services at mobile environment and is based on Eureka-147 DAB(Digital Audio Broadcasting) for transmission method. Also DMB provides the error protection method of convolution coding. In this paper, we study on the effective error resilience coding of MPEG-4 video stream over DMB system. In our algorithm, the first, we partition the MPEG-4 data using the MPEG-4 data partitioning method, and then controls the convolution coding rate according to the importance of the partitioned data. From our simulation result, we show that our algorithm is proper for terrestrial DMB services.

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Adaptive Channel Estimation and Decision Directed Noise Cancellation in the Frequency Domain Considering ICI of Digital on Channel Repeater in the T-DMB (T-DMB 동일 채널 중계기의 주파수 영역에서 ICI를 고려한 적응형 채널 추정과 결정지향 잡음 제거)

  • Kim, Gi-Young;Ryu, Sang-Burm;Ryu, Heung-Gyoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.4
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    • pp.491-498
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    • 2012
  • Recently, many papers have been proposed in order to improve the OFDM system performance in T-DMB DOCR (Digital On Channel Repeater), by using removing the feedback signal so that the transmitter power can be increased or by using the equalizer to remove ICI. Despite these efforts, however, signal quality at the receiving terminal has not been improved because of constellation smearing in T-DMB DOCR. In this paper, in order to suppress constellation smearing, we propose an effective equalizer algorithm that can improve system performance. We perform adaptive channel estimation and non-coherent decision directed noise cancellation method that can estimate the channel subsequently during data symbols period in the frequency domain. So we can obtain better quality of the signal at the receiving terminal. In order to secure QoS(Quality of Service) required in T-DMB handsets, we evaluate SNR and BER in T-DMB DOCR(Digital On Channel Repeater) and verified by simulation. In this simulation results, this system is satisfied the performance of BER=$10^{-5}$ at less than SNR=14 dB at the receiver after compensation of phase noise -18 dBc.

Design and Implementation of a Splicer for Seamless Swiching between Programs in the Terrestrial DMB (지상파DMB에서 끊김없는 프로그램의 전환을 위한 스플라이서의 설계 및 구현)

  • Lee Yong-Hoon;Lee Jin-Hwan;Lee Gwang-Soon;Lee Soo-In;Kim Nam
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.5A
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    • pp.537-545
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    • 2006
  • As the T-DMB service is launched, some service requirements become necessary to send local programs such as advertisement and specific programs at the local broadcasting station while re-transmitting the broadcasting signal coming from the central or other station. In this paper, we propose a signalflow required for the effective splicing in the T-DMB system which usesboth MPEG-2 and MPEG-4 system specifications, and we illustrate the reconfiguring process into the ensemble stream that is widely used for the transmission of the T-DMB signal. Moreover, its performance is confirmed by comparing the images decoded at the recevier when the transport stream is swiched by using the splicer implemented through the proposed techniques.

The Efficient Allocation Method of DAB Channels on T-DMB Frequency Band (T-DMB 대역에서 DAB 채널의 효율적인 채널 배치 방안)

  • Kim, Joo-Seok;Kim, Kyung-Seok
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.11 no.6
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    • pp.135-141
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    • 2011
  • Analog medias are converting to digital with the development of the digital communications. The Korean radio broadcasting services yet on analog and the research for the digital radio is progressing. The digital conversion of radio broadcasting has already progressed in foreign countries because of the technical limitation of analog broadcasting(The radio-frequency efficiency is poor). DAB is one of the digital radio mode, it doesn't use on AM/FM band and uses on T-DMB frequency band. So, it has an advantage of being able to broadcast with the existing radio without interference at once. On the other hand, it has the potential to cause interference to existing T-DMB broadcasting. In this paper, we propose an efficient DAB channel allocation method for digital radio on T-DMB frequency band. This paper allocates the DAB channel without interference to existing T-DMB broadcasting and proves the proposed method through simulations for the interference analysis.

The Study of Hierarchical Transmission Method for Additional Service of Advanced T-DMB (차세대 T-DMB 방송의 부가서비스 제공을 위한 계층적 전송방식에 대한 연구)

  • Kim, Min-Hyuk;Park, Tae-Doo;Kim, Nam-Soo;Jung, Ji-Won;Lee, Seong-Ro;Choi, Myeong-Soo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.12C
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    • pp.997-1005
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    • 2008
  • In this paper, we proposed advanced T-DMB system which is based on Eureka-147 using UEP coding methods and hiererchical modulation for providing additional services while maintaining BER performance. We simulated the proposed advanced T-DMB system using unequal l6QAM modulation scheme combined with various bit split methods and coding methods such as double binary turbo code of DVB-RCS standard and LDPC code of DVB-S2 standard. In the simulation results, double binary turbo code and LDPC code of proposed advanced T-DMB system have coding gain of 2dB and 3.5dB compared to conventional T-DMB system respectively.

Development of Media Multiplxing System for Hierarchical Transmission of High Quality AT-DMB AV Stream (고품질 Advanced T-DMB(AT-DMB) AV 스트림의 계층적 전송을 위한 미디어 다중화 시스템 개발)

  • Kim, Min-Sung;Jun, Do-Young;Yang, So-Jung;You, Hong-Yeon;Hong, Sung-Hoon
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.179-180
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    • 2008
  • 본 논문에서는, 고품질 AT-DMB 시스템을 위해서 각 계층 ES(Elementary Stream)을 MPEG-4 over PEG-2 시스템과 Eureka-147 DAB 시스템을 통해 서로 다른 채널로 전송한다. 계층별 전송으로 인한 시간 지연에 대처하여 수신 입력부에서는 각각의 계층으로 전송된 ES들이 동기화 되어 복호화 되도록 SVC의 계층적 비트스트림 구조와 적응적으로 동작되는 다중화 시스템 구조를 제작하였다.

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Interactive Multimedia Authoring Tool using MPEG-4 BIFS and Wireless Network (MPEG-4 BIFS와 무선데이터통신망을 이용한 인터렉티브 멀티미디어 저작 도구)

  • Ryu, Sung-Pil;Kwak, Nae-Jung;Kwon, Dong-Jin
    • Proceedings of the Korea Contents Association Conference
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    • 2006.11a
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    • pp.458-460
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    • 2006
  • MPEG-4 BIFS(Binary Format for Scene) is the format to describe the information of time-spatial location of each visual objects in the scene. This is broadcasting for test through T-DMB in the our country and is able to be converted to various multimedia formats. The DMB receivers used currently are loaded on mobile devices mostly and the supply of the receiver is increasing steadily. These enable various service for convergence of DMB and wireless network to do. Therefore, this paper propose a new method of interactive multimedia authoring tool using wireless network and MPEG-4 BIFS. The proposed method corrects and complements MPEG-4 BIFS and have DMB broadcasting and wireless network co-operate. Also using this method, users can make out contents by themselves and can retransmit them through DMB broadcasting. The proposed method produce interactive multimedia contents reconstructed at user's request.

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