• Title/Summary/Keyword: Satellite multimedia system

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Design and Performance Evaluation of OBP Satellite B-ISDN Transport Network Architecture (OBP 탑재 n이성 B-ISDN 중계망 구조 설계 및 성능 평가)

  • Park, Seok-Cheon
    • The Transactions of the Korea Information Processing Society
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    • v.7 no.3
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    • pp.901-908
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    • 2000
  • Satellite communication in the 21 century's high tech information world is developing rapidly, marked by high levels of applications and functions. For example, satellite communication can process and switch the speed of the service provided by a broad and vast digital multimedia system such as a long-distance all between nations or broadcasting transfer service, which is supplied by a contemporary satellite system. So, it bring about problems which lack of satellite orbit and gibes out frequency resource by increment of satellite universally. To support this, an OBP satellite system is need, which includes an on-board IF/RF switch, baseband signal processing, multi-beam antenna technology, as well as a simple transponder system. In this paper, we have outlined the next generation of satellite communication; satellite OBP transport network architecture, which offers multimedia service and applied frequency reuse method for multi-spot beam. The satellite B-ISDN transport network architecture is also analyzed.

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Phase Difference Detector for Satellite Tracking Based on Field Experiments of COMETS

  • Ta, Masuhisa;Nakajima, Isao;Juzoji, Hiroshi
    • Journal of Multimedia Information System
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    • v.5 no.3
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    • pp.155-162
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    • 2018
  • Nowadays, the tracking technology of Quadrant Detector will become actual by new micro devices. Based on the past filed data of the reception experiment with COMETS satellite, we have studied on new device (AD8302, phase difference detector) was acquired and suspect its abilities. In 1998, we have developed a Quadrant Detector for mobile to track a weak signal from satellite on Ka band of COMETS. The Quadrant Detector is comprised of four dedicated feed components for reception under an environment of Nakagami - Rician fading, and one transmission and reception feed component. We were successful in receiving a 23 GHz beacon signal from ICE transponder of the COMETS and succeeded in tracking the satellite from a moving vehicle at speeds of approximately 10 ~ 20 Km/h on paved roads. In 2018, with new device AD8302, we have verified new QD system and performed a simulation, based on the past filed experiment. This new device shall be improving the tracking abilities from mobile body on the earth to the multimedia satellite.

Transmission Structure for Channel Adaptive Satellite Broadcasting System (채널 적응형 위성방송 전송에 적합한 전송구조)

  • Chang, Bae-Ig;Kim, Nae-Soo
    • Proceedings of the Korea Information Processing Society Conference
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    • 2003.11b
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    • pp.1181-1184
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    • 2003
  • 본 논문은 광대역 적응형 위성방송 전송기술에서 전송채널의 환경변화에 적응적으로 대처하기 위한 방법에 국한하며 방송 서비스에 적합한 채널 적응형 전송구조로 계층적 변조방식과 시분할 AMC 전송구조를 제안하고 전송특성 및 구조를 분석하여 장단점을 비교한다.

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Development of a Tiled Display GOCI Observation Satellite Imagery Visualization System (타일드 디스플레이 천리안 해양관측 위성 영상 가시화 시스템 개발)

  • Park, Chan-sol;Lee, Kwan-ju;Kim, Nak-hoon;Lee, Sang-ho;Seo, Ki-young;Park, Kyoung Shin
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2013.10a
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    • pp.641-642
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    • 2013
  • This research implemented Geostationary Ocean Color Imager (GOCI) observation satellite imagery visualization system on a large high-resolution tiled display. This system is designed to help users observe or analyze satellite imagery more effectively on the tiled display using multi-touch and Kinect motion gesture recognition interaction. We developed the multi-scale image loading and rendering technique for the massive amount of memory management and smooth rendering for GOCI satellite imagery on the tiled display. In this system, the unit of time corresponding to the selected date of the satellite images are sequentially displayed on the screen. Users can zoom-in, zoom-out, move the imagery and select some buttons to trigger functions using both multi-touch or Kinect gesture interaction.

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Design and Implementation of RET management system for Satellite Multimedia Internet Service (위성 멀티미디어 인터넷 서비스를 위한 RCST관리 시스템 설계 및 구현)

  • 손경호;백승진
    • Proceedings of the IEEK Conference
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    • 2002.06a
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    • pp.231-234
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    • 2002
  • This paper has studied a management system for RCST of the Satellite Multimedia Internet Service through analysing the architecture and specification of BSAN based on Digital Video Broadcasting System. In this paper, designing and implementing RCST DPM and agent system are shown. The UCD-SNMP framework served as base station for implementation of the agent. And the message protocol between RCST DPM and agent system has been also defined to provide a way for interaction.

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Packet Scheduling in Interactive Satellite Return Channels for Mobile Multimedia Services Using Hybrid CDMA/TDMA

  • Lee Ki-Dong;Kim Ho-Kyom;Lee Ho-Jin
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2003.05a
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    • pp.744-748
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    • 2003
  • Developing an interactive satellite multi­media system, such as a digital video broadcasting (DVB) return channel via satellite (RCS) system, is gaining popularity over the world To accommodate the increasing traffic demand we are motivated to investigate an alternative for improving return channel utilization We develop an efficient method for optimal packet scheduling in an interactive satellite multimedia system using hybrid CDMA/TDMA channels. We formulate the timeslot-code assignment problem as a binary integer programming (BIP) problem, where the throughput maximization is the objective, and decompose this BIP problem into two sub-problems for the purpose of solution efficiency. With this decomposition, we promote the computational efficiency in finding the optimal solution of the original BIP problem Since 2001, ETRI has been involved in a development project where we have successfully completed an initial system integration test on broadband mobile Internet access via Ku-band channels using the proposed resource allocation algorithm.

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Performance Improvement of Satellite Broadcasting System in Rain Attenuation (강우 감쇠가 존재하는 위성 방송 시스템의 성능 개선)

  • Kang, Heau-Jo
    • Journal of Advanced Navigation Technology
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    • v.10 no.4
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    • pp.356-363
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    • 2006
  • The demand for digital multimedia service using Ka band satellite communication are growing rapidly. So, in this paper, we have analyzed rain attenuation with typical model, and proposed prediction model of rain attenuation in high frequency(20 GHz). This paper illustrates Korea rain attenuation characteristics at the Ka band Koreasat beacon frequency based on the theoretical and empirical approaches and seek for efficient techniques by rain attenuation estimate and analyzed performance of adaptive modulation system. Propose prediction model of rain attenuation and parameter of satellite link can be available for the Ka band satellite communication.

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Analysis of the Adjacent Channel Interference from High Power Gap-filler in Satellite Digital Multimedia Broadcasting (DMB) (위성 DMB에서 지상중계기 출력에 의한 인접 채널 간섭 분석)

  • Choi, Bokun;Lee, Youngjin;Hong, Youngjin;Seo, JongSoo
    • Journal of Broadcast Engineering
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    • v.10 no.3
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    • pp.372-382
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    • 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.

Performance Characteristic of satellite Wibro system in the high-speed Railroad Channel Environment

  • Song, Seung-Won;Cho, Hyun-Myung;Lee, Byung-Seub;Shin, Min-Su;Ryu, Joon-Gyu;Chang, Dae-Ig
    • Journal of Satellite, Information and Communications
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    • v.2 no.2
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    • pp.1-9
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    • 2007
  • In this paper, we describe the performance degradation of satellite Wibro system and compensation method in the high-speed railroad channel environment. High-speed railroad channel environment is divided into LOS channel and tunnel. In the LOS channel, signal blocking caused by railroad power feeder structures can be a critical problem which is can be solved with antenna diversity. On the other hand, multi path interference phenomenon, representable by propagation model of Optic Fiber, occurred in the tunnel may be another obstacle. These satellite Wibro system performance degradations in railroad channel environment are addressed and adequate compensation methods are proposed and verified through computer simulation. In addition, the ICI caused by Doppler shift in OFDM system is analyzed with its compensation method.

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A Design of Web Browsing System based on Content Retransmission in Marine Satellite Network (해양 위성통신망에서 콘텐츠 재전송 기반 웹 브라우징 서비스 시스템 설계)

  • Kim, Jae-Ho;Kim, Geun-Hyung
    • Journal of Korea Multimedia Society
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    • v.16 no.10
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    • pp.1204-1213
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    • 2013
  • With the development of digital satellite communication technology and the widespread use of smart devices, the demand for data communication in the maritime ship has increased. Recently, the communication between the maritime ship and the land is based on Inmarsat satellite service. The Inmarsat provides telephone, fax, data and telex service etc. However, since the satellite is payper-seconds billing service, the transmission of whole web contents to the maritime ship through the satellite causes high cost. In this paper, we propose web browsing system architecture that reduces the data traffic on the satellite link and retransmits the content selectively in order to solve these problems.