• 제목/요약/키워드: 데이터 송수신

검색결과 727건 처리시간 0.023초

Energy Efficient Transmit and Receive Strategies (에너지 효율적인 송수신 운용 방안)

  • Oh, Changyoon
    • Journal of the Institute of Electronics and Information Engineers
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    • 제51권2호
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    • pp.3-9
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    • 2014
  • We propose energy efficient transmit and receive strategies for nomadic M2M devices. Recently, communication applications consume more and more battery. Hence, the efficient battery management is becoming increasingly important. Turbo code as a channel coding is being widely used in many communication areas. Accordingly, the efficient energy management in using turbo code is an important issue. In this paper, we optimize joint transmit and receive energy for M2M devices pair. We first model the transmit energy and receive energy. Then, we develop the energy efficient transmit and receive strategies.

IEEE13941/Linux based Media Streaming for Digital Home Services (디지털 홈 서비스를 위한 리눅스 환경의 IEEE1394 기반 미디어 스트리밍)

  • Lee Sung Yong;Lee Jae Gil;Choi Chang Yeol
    • The Journal of Korean Institute of Communications and Information Sciences
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    • 제29권10B호
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    • pp.857-865
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    • 2004
  • Recently the interest in digital home services and its related technology has increased rapidly. Multimedia data transmission between digital devices that are connected to home network is essential function. This paper presents the design and implementation of multimedia streaming system based on IEEE1394 in Linux environment. The key features of proposed system are as follows. First, it can transmit and receive not only DV format data but also MPEG2-TS format data through IEEE1394 bus. Second, it uses device drivers that handling IEEE1394 and IEC61883 protocol transparently to reduce the complexity of communication program. Third, it applied capacity adaptation technique considering various specifications of PCs to get smooth streaming for HD data. These characteristics are tested on testbed of IEEE1394 based home network. The proposed media streaming technique can be used as a home media sever in Linux environment.

Image Data Transmission and Receiving System of KITSAT-3-Performance of initial operation (우리별3호 영상데이터 송수신 시스템 - 초기운용 성능 실험)

  • 신동석;김탁곤;최욱현
    • Korean Journal of Remote Sensing
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    • 제15권3호
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    • pp.209-216
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    • 1999
  • KITSAT-3, the third satellite of KITSAT series which has been developed for the last four and half years with purely Korean design and implementation technology, was launched successfully at last. All subsystems were tested and validated during the initial operation of the satellite. During the initaial operation phase, the Earth imaging camera on board KITSAT-3 acquisited several tens of scenes all over the world and transmitted the image data to ground station. The quality of images and the reliability of data transmission-reception system were tested qualititively and quantititively, respectively. In this paper, we summarize the camera, data handling, on-board memory, and image data transmission system of KITSAT-3 as well as the image receiving and archiving system in ground station. The error rate of image data transmission and reception was tested during the initial operation phase. The average data transmission error rate satisfied the initial requirement of less than 1%. The error rate will be reduced through the continuous work of test and stabilization of the ground system hardware.

Implementation of Real Time P2P Framework for Spatial Data Sharing between Mobile Devices using SIP (모바일 기기 간의 SIP기반 실시간 공간정보 공유 프레임워크 구현)

  • Park, Key-Ho;Jung, Jae-Gon
    • Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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    • 한국GIS학회 2008년도 공동추계학술대회
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    • pp.65-72
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    • 2008
  • Mobile Collaboration is an enabling technology that makes users share information between mobile devices and various Mobile P2P platforms have been designed and implemented for it. There are, however, few research papers on application of SIP protocol to spatial data sharing on mobile devices. In this paper, SIP based real time sharing framework is proposed to compose a mobile P2P platform on which spatial data can be trans(erred. A new protocol based on WKT and WKB is defined to send and receive spatial objects with SIP MESSAGE method. Base maps such as digital maps and parcel maps can be provided by a map server that is integrated with SIP server after a new SIP session established and client agents are registered. The framework proposed based onSIP enables users to transfer spatial data such as maps and satellite images directly between mobile devices during VoIP based voice call and therefore, mobile applications can be applied in various domains such asforest management and national defense.

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Construction of Indoor Ground Station for Cubesat Communication Test (큐브위성 송수신시험을 위한 실내용 지상국 구축)

  • Han, Sanghyuck;Moon, Sangman;Shin, Dongyeop;Moon, SungTae;Gong, Hyeon Cheol;Choi, Gi-Hyuk
    • Aerospace Engineering and Technology
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    • 제13권2호
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    • pp.73-79
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    • 2014
  • During developing cubesat flight software, Communication test between cubesat and ground station is needed. For this, we have constructed indoor ground station without outdoor antenna for decreasing total cost and time. In this time, if output power of ground station is high, it will affect for cubesat transceiver to be fail. For solving this problem, ground station must be designed for output power of it to be lower than input power of cubesat satellite, and it must be verified. In this paper, first, we describe cubesat indoor ground station using UHF and VHF. Second, we describe output power decreasing test for indoor operation of ground station by attaching attenuators in the end of the output connector.

Optimal Placement of Sensor Nodes with 2.4GHz Wireless Channel Characteristics (2.4GHz 무선 채널 특성을 가진 센서 노드의 최적 배치)

  • Jung, Kyung-Kwon;Eom, Ki-Hwan
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • 제44권1호
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    • pp.41-48
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    • 2007
  • In this paper, we propose an optimal placement of sensor nodes with 2.4GHz wireless channel characteristics. The proposed method determines optimal transmission range based on log-normal path loss model, and optimal number of sensor nodes calculating the density of sensor nodes. For the lossless data transmission, we search the optimal locations with self-organizing feature maps(SOM) using transmission range, and number of sensor nodes. We demonstrate that optimal transmission range is 20m, and optimal number of sensor nodes is 8. We performed simulations on the searching for optimal locations and confirmed the link condition of sensor nodes.

Recent Trends on High-Speed Duobinary Transceiver Architecture (고속 듀오바이너리 송수신단 설계기술 동향)

  • Nam, Han-min;Kong, Bai-Sun
    • Journal of IKEEE
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    • 제23권3호
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    • pp.1038-1045
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    • 2019
  • This paper describes high-speed duobinary transceiver design techniques which are widely used to increase data-rate despite limited channel bandwidth. At high data-rate, signal level is severely degraded as signal frequency becomes larger than the channel bandwidth. Mathematically, a duobinary signal has lower frequency components compared to a Non-Return-to-Zero signal for the same data-rate. Therefore, by using the duobinary signaling, the signal loss can be effectively reduced in physical channel environment as compared to the Non-Return-to-Zero signaling. The mathematical basis of duobinary signaling, and its applications to high-speed transceiver design are investigated in this paper.

Conceptual Design of COMS Ground System for Meteorological and Oceanic Mission (통신해양기상위성의 기상 및 해양 임무 수행을 위한 지상국 개념설계)

  • Lim, Hyun-Su;Choi, Hae-Jin
    • Satellite Communications and Space Industry
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    • 제12권1호통권27호
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    • pp.115-121
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    • 2004
  • 본 연구의 목적은 2008년 발사를 목표로 개발 중인 통신해양기상위성(COMS: Communication, Ocean and Meteorological Satellite) 1호의 해양/기상 임무를 수행을 지원할 지상 시스템의 개념 설계를 수행하는 것이다. 송수신 시스템 개발을 위한 사용자 요구사항 분석과 외국 정지궤도의 위성의 영상 전 처리 시스템에 대한 기법 분석이 이루어 졌으며, 이를 바탕으로 통신해양기상위성 송수신 시스템의 데이터 흐름도를 작성하였다. 통해기 지상 시스템은 신뢰성 있는 위성 운영과 자료처리 기술의 자립화를 위해 국내 기술로 자체 개발될 예정이다.

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Implementation of Wireless Controller with Convolrution Codings (컨벌루션 부호를 적용한 무선 콘트롤러의 구현)

  • 이규선;강병권
    • Proceedings of the KAIS Fall Conference
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    • 한국산학기술학회 2003년도 춘계학술발표논문집
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    • pp.226-228
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    • 2003
  • 본 논문에서는 현재 산업현장에서 사용되고 있는 유선 콘트롤러와 무선 콘트롤러의 문제점을 보완하기 위해 컨벌루션 부호와 CRC부호를 적용한 무선 콘트롤러를 구현하였다. 콘트롤러의 제어를 위해 마이크로프로세서를 이용하였으며, 무선 콘트롤러의 신뢰도 향상을 위해 적용한 컨벌루션 부호는 구속장 k=3, 부호율 ½인 부호를 사용하였고, CRC 부호는 POLYNOMIAL함수를 X/sup 15/ + X² + 1로 사용하여 총 CRC비트 16비트(2바이트)가 되게 하였다. 또한 구현된 무선 콘트롤러를 무선환경에서 테스트하여 송수신시 정확하게 데이터의 송수신이 이루어짐을 확인하였다.

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