• 제목/요약/키워드: Transmission system for Time Information

검색결과 1,100건 처리시간 0.029초

Geo/D/1/1 모형에서의 실시간 원격 추정값의 오차 분석 (Analysis of Real-time Error for Geo/D/1/1 Model)

  • Yutae, Lee
    • 한국정보통신학회논문지
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    • 제27권1호
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    • pp.135-138
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    • 2023
  • In this paper, we study real-time error in the context of monitoring a binary information source through a delay system. To derive the average real-time error, we model the delay system as a discrete time Geo/D/1/1 queueing model. Using a discrete time three-dimensional Markov chain with finite state space, we analyze the queueing model. We also perform some numerical analysis on various system parameters: state transition probabilities of binary information source; transmission times; and transmission frequencies. When the state changes of the information source are positively correlated and negatively correlated, we investigate the relationship between transmission time and transmission frequency.

이진 마르코프 연쇄 모형 기반 실시간 원격 추정값의 오차 분석 (Analysis of Real-time Error for Remote Estimation Based on Binary Markov Chain Model)

  • Lee, Yutae
    • 한국정보통신학회논문지
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    • 제26권2호
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    • pp.317-320
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    • 2022
  • This paper studies real-time error in the context of monitoring a symmetric binary information source over a delay system. To obtain the average real-time error, the delay system is modeled and analyzed as a discrete time Markov chain with a finite state space. Numerical analysis is performed on various system parameters such as state transition probabilities of information source, transmission times, and transmission frequencies. Given state transition probabilities and transmission times, we investigate the relationship between the transmission frequency and the average real-time error. The results can be used to investigate the relationship between real-time errors and age of information.

ATP시스템에서 열차속도에 따른 지상자에서 차상자로의 자계의 세기에 관한 연구 (A Study on the Magnetic Intensity from Wayside Transmitter to On-board Transmitter about the Train Speed in ATP system)

  • 김민석;고준석;이상혁;김민규;이종우
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2010년도 춘계학술대회 논문집
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    • pp.1841-1848
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    • 2010
  • Electric railway system consist of rolling stock, track, signal and streetcar line system. ATP(Automatic Train Protection) system in railway signaling system is the important one grasping the position and velocity of a train. The wayside transmitter of ATP system is installed between rails. Recently, the research about increasing train speed has been developed in total departments of the railroad systems. The study on the information transmission between on-board transmitter and wayside transmitter is required for increasing the train speed in the ATP system. When the train speed is increased as to same transmissi on distance, the problem on information transmission occurs because the transmission time is decreased. In case that the transmission distance is extended, the transmission time is decreased with respect to the train speed. Therefore, we have to define the standard magnetic intensity as to the train speed in order to transmit correctly telegram. In this paper, the transmission distance for the telegram is suggested on the basis of the train speed. Also, the standard magnetic intensity from the wayside transmitter to on-board transmitter is proposed by using transmission distance regarding the train speed in the ERTMS/ETCS system by using Matlab program.

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Improved Coded Mark Inversion for the Passive Radio Frequency Transmission System of the Electronic Time Fuze

  • Xiong, Dong;Zeng, Xiaoping;Zhao, Xiaogang
    • ETRI Journal
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    • 제31권3호
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    • pp.348-350
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    • 2009
  • To fit the limited volume and power consumption of the passive radio frequency transmission system of the electronic time fuze, an improved coded mark inversion (CMI) is proposed in this letter. From the performance analysis, the energy transmission efficiency of this encoding method is at least 50% higher than that of CMI and NRZ. Finally, the experiment results show that by adopting this improved CMI, the change of DC voltage through magnetic coupling is lower than 0.2 V when the accuracy of data transmission is above 99.5%.

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신호전송 시간지연을 갖는 원격조작시스템의 힘반영 위치제어 (A Force Reflecting Position Control for Teleoperation Systems with Signal Transmission Time Delay)

  • 안성호;진재현;박병석;윤지섭
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2002년도 하계종합학술대회 논문집(5)
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    • pp.157-160
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    • 2002
  • When the teleoperation system has a signal transmission time delay between slave system and control system, the position tracking performance of the slave system and system stability are likely to be deteriorated. This paper proposes a force reflecting position control scheme for teleoperation system with signal transmission time delay. The proposed scheme not only satisfy the system internal stability but also improves the position tracking performance with disturbance rejection capability. The simulation results show that the proposed control method provides excellent performances.

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초고속 광전송 시스템용 전송로 부호의 성능 분석 (The Performance Analysis of Transmission Line Codes for the Very-High Speed Optical Transmission System.)

  • 유봉선
    • 한국정보처리학회논문지
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    • 제1권4호
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    • pp.479-489
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    • 1994
  • 정보신호계열을 초고속으로 전송하기 위한 디지틀 광전송 시스템이 대용량화, 경 제화됨에 따라, 효율적으로 순수 정보신호계열을 신뢰성있게 전송할 수 있는 초고속 광전송 시스템용 전송로 부호의 선택이 현시점에서 중요한 문제로 대두되고 있다. 따라서 본 논문에서는 지금 까지 제안된 2치 unipolar 전송로 부호들 중 고속(100Mb/s 이상의 전송속도) 광전송 시스템으로 적합한 전송로 부호들을 우선 선택하여, 선택한 전송로 부호들 간의 성능 평가를 전송로 부호의 요구조건들, 즉 최대 동부호 연속수, 전송지연시간, 클럭 상승률, 마크율, 회로규모, 전송로 에러 감시 및 전력 스펙트럼에 따라 상호 비교 분석 한 결과, mBIZ부호가 최적의 초고속 광전송 시스템용 전송로 부 호임을 밝혔다.

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An Anti-Interference Cooperative Spectrum Sharing Strategy with Joint Optimization of Time and Bandwidth

  • Lu, Weidang;Wang, Jing;Ge, Weidong;Li, Feng;Hua, Jingyu;Meng, Limin
    • Journal of Communications and Networks
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    • 제16권2호
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    • pp.140-145
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    • 2014
  • In this paper, we propose an anti-interference cooperative spectrum sharing strategy for cognitive system, in which a secondary system can operate on the same spectrum of a primary system. Specifically, the primary system leases a fraction of its transmission time to the secondary system in exchange for cooperation to achieve the target rate. To gain access to the spectrum of the primary system, the secondary system needs to allocate a fraction of bandwidth to help forward the primary signal. As a reward, the secondary system can use the remaining bandwidth to transmit its own signal. The secondary system uses different bandwidth to transmit the primary and its own signal. Thus, there will be no interference felt at primary and secondary systems. We study the joint optimization of time and bandwidth allocation such that the transmission rate of the secondary system is maximized, while guaranteeing the primary system, as a higher priority, to achieve its target transmission rate. Numerical results show that the secondary system can gain significant improvement with the proposed strategy.

ATP 시스템에서 열차속도에 따른 지상자에서 차상자까지의 자계의 세기 및 비트오류율에 관한 연구 (A Study on the Magnetic Field Intensity and BER from Wayside Device to On-board Device about the Train Speed in ATP System)

  • 김민석;이상혁;이종우
    • 전기학회논문지
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    • 제59권10호
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    • pp.1803-1808
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    • 2010
  • Electric railway system consists of rolling stock, track, signal and catenary system. ATP system in railway signaling system is the important one grasping the position and velocity of a train. The wayside device of ATP system is installed between rails. Recently, the research about increasing train speed has been developed in total departments of the railroad systems. The study on the information transmission between on-board device and wayside device is required for increasing the train speed in the ATP system. When the train speed is increased as to same transmission distance, the problem on information transmission occurs because the transmission time is decreased. In case that the transmission distance is extended, the transmission time is decreased with respect to the train speed. Therefore, we have to define the standard magnetic field intensity as to the train speed in order to transmit correctly telegram. In this paper, the transmission distance for the telegram is suggested on the basis of the train speed. Also, the standard magnetic field intensity from the wayside device to on-board device is proposed by using transmission distance regarding the train speed in the ERTMS/ETCS system by using Matlab program. Also, BER according to the train speed is presented by calculating electric field intensity from the magnetic field intensity.

PHS를 이용한 열차정보 전송 방안 (Method for Train Information Transmission using PHS)

  • 조봉관
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2004년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.240-241
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    • 2004
  • JP Nagoya. Inc started special work(passenger order} to transmit information to the passenger from 2001 following the eastern area' heavy rain in 2000. They introduced 'Passenger Information System' which uses self communication network(LAN, PHS) mainly and wire/wireless and internet jointly. As an information transmission method of this system, there is "train information transmission using PHS" which transmits info to LED display in special train. This system configured by adding new equipments and using existing equipments, network in maximum, this study reviewed the system, which transmits real time operation condition unified by these passenger order to passenger in high quality, more promptly.

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Energy Optimal Transmission Strategy in CDMA System: Duality Perspective

  • Oh, Changyoon
    • 한국컴퓨터정보학회논문지
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    • 제20권9호
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    • pp.61-66
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    • 2015
  • We investigate rate scheduling and power allocation problem for a delay constrained CDMA systems. Specifically, we determine an energy efficient scheduling policy, while each user maintains the short term (n time slots) average throughput. More importantly, it is shown that the optimal transmission strategy for the uplink is same as that of the downlink, called uplink and downlink duality. We then examine the performance of the optimum transmission strategy for the uplink and the downlink for various system environments.