• Title/Summary/Keyword: information transmission system

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Design and Implementation of System for Wireless Transmission of Medical Information Using Zigbee (Zigbee를 이용한 의료정보 무선 전송시스템 설계 및 구현)

  • Kim Kook-Jun;Kim Young-Kil;Cho Woo-Sung
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.3
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    • pp.487-492
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    • 2005
  • As the portable medical equipments consume the power and transmission of the information, they need the system to use long. Although the current wireless transform systems for medical equipments use Bluetooth protocol system, an electricity consumption is big because it uses long and there is the difficulty in the utility We designed a module using the Zigbee protocol which an electricity consumption is more small though a transmission speed is slower than Bluetooth and drew the plan the wireless transmit system for medical equipments to use long.

A Study on Minimization of Train Delays and Train Operation Interruptions by RF Transmission System. (RF 통신시스템을 이용한 열차 운행중단 및 열차 지연의 최소화에 관한 연구)

  • Lee, We-Jae;Kook, Kwaung-Ho
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.1466-1472
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    • 2008
  • To minimize the train operation interruptions and train exchanges, the RF transmission system is proposed. The current control room of the Seoul Metro has information of the train movement through the Total Traffic Control System, but it does not have information of the train itself, rail status, and other facilities' status. When some trouble occurs during train operation, the train crews should report the control room about the trouble and fix it. If the control room has exact information of the trouble, the expert in the control room can help the crews to fix the trouble swiftly and exactly. Since the crews are busy taking care of the trouble, they often miss to report the control room on time. The proposed RF transmission system relays the information of the train to the control room automatically in real time, and makes it possible to provide the passengers good service by reducing the train operation interruptions and train exchanges.

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Analysis of Channel Capacity for VDSL System (VDSL system을 위한 전송능력 분석)

  • 유창완;정인택;송상섭
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.37-40
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    • 1999
  • In this paper, we analyzed transmission capability of VDSL system under the various noise in VDSL transmission lines. For this, we calculated transmission capacity using loading algorithm with transmission channel which suggested by ANSI DSL standard group TIE1.4. As a result, we've got approximated outcome similiar with target capacity in VDSL systems in short range. But we couldn't have got a outcome with target capacity in long range.

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A Web-based QoS-guaranteed Traffic Control system (웹 기반의 QoS 보장형 트래픽 제어 시스템)

  • 이명섭;신경철;류명춘;박찬현
    • Proceedings of the IEEK Conference
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    • 2002.06a
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    • pp.45-48
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    • 2002
  • This paper presents a QoS-guaranteed traffic control system which supports QoS of realtime packet transmission for the multimedia communication. The traffic control system presented in this paper applies the integrated service model and provides QoS o(packet transmission by means of determining the packet transmission rate with the policy of network manager and the optimal resource allocation according to the end-to-end traffic load. It also provides QoS for the realtime packet transmission through the AWF2Q+ Scheduling algorithm and per-class queuing method.

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Pilot Symbol Assisted High Speed Packet Transmission System based on Adaptive OFDM in Broadband Mobile Channel

  • Ahn, Chang-Jun;Sasase, Iwao
    • Journal of Communications and Networks
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    • v.5 no.1
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    • pp.25-32
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    • 2003
  • 4G mobile communication system requires the throughput of 10-100Mbps. Adaptive modulated OFDM system is promising technique for increasing the throughput. In the pilot symbol assisted high-speed packet transmission system, the data symbol duration is generally considered to be small compared to the coherence time. However, OFDM symbol duration is longer than the symbol duration of a single carrier system, so that the packet duration of the pilot symbol assisted high speed packet transmission system is long. In this case, the change of channel conditions is too fast to be accurately estimated by channel estimator at the receiver in high Doppler frequency, so that many errors occur during demodulation, especially with the data symbols at the end of each packet. In this paper, we consider the BER at various instantaneous $E_b/N_o$ that includes the demodulation errors in high Doppler frequency. When the coherence time is ten times longer than the duration of a single packet, the channel can be closely approximated as an AWGN channel. Otherwise, the approximation breaks down and the above-mentioned errors that occur during demodulation must be taken into consideration. In this paper, we propose the pilot symbol assisted high speed packet transmission system based on adaptive OFDM using a novel lookup table to consider the demodulated errors and evaluate the throughput performance.

The Influence of Noise Environment upon Voice and Data Transmission in the RF-CBTC System

  • Kim, Min-Seok;Lee, Sang-Hyeok;Lee, Jong-Woo
    • International Journal of Railway
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    • v.3 no.2
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    • pp.39-45
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    • 2010
  • The RF-CBTC (Radio Frequency-Communication Based Train Control) System is a communication system in railroad systems. The communication method of RF-CBTC system is the wireless between the wayside device and on-board device. The wayside device collects its location and speed from each train and transmits the distance from the forwarding train to the speed-limit position to it. The on-board device controlling device controls the speed optimum for the train. In the case of the RF-CBTC system used in Korea, transmission frequency is 2.4 [GHz]. It is the range of ISM(Industrial Scientific and Medical equipment) band and transmission of voice and data is performed by CDMA (Code Division Multiple Access) method. So noises are made in the AWGN (Additive White Gaussian Noise) and fading environment. Currently, the SNR (Signal to Noise Ratio) is about 20 [dB], so due to bit errors made by noises, transmission of reliable information to the train is not easy. Also, in the case that two tracks are put to a single direction, it is needed that two trains transmit reliable voice and data to a wayside device. But, by noises, it is not easy that just a train transmits reliable information. In this paper, we estimated the BER (Bit Error Rate) related to the SNR of voice and data transmission in the environment such as AWGN and fading from the RF-CBTC system using the CDMA method. Also, we supposed the SNR which is required to meet the BER standard for voice and data transmission. By increasing the processing gain that is a ratio of chip transmission to voice and data transmission, we made possible voice and data transmission from maximally two trains to a wayside device, and demonstrated it by using Matlab program.

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Channel Capacity Analysis of DNA-based Molecular Communication with Length Encoding Mechanism

  • Xie, Jialin;Liu, Qiang;Yang, Kun;Lin, Lin
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.15 no.8
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    • pp.2923-2943
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    • 2021
  • The double helix structure of DNA makes it diverse, stable and can store information with high density, and these characteristics are consistent with the requirements of molecular communication for transport carriers. In this paper, a specific structure of molecular communication system based on DNA length coding is proposed. Transmitter (Tx) adopts the multi-layer golden foil design to control the release of DNA molecules of different lengths accurately, and receiver (Rx) adopts an effective and sensitive design of nanopore, and the biological information can be converted to the electric signal at Rx. The effect of some key factors, e.g., the length of time slot, transmission distance, the number of releasing molecules, the priori probability, on channel capacity is demonstrated exhaustively. Moreover, we also compare the transmission capacity of DNA-based molecular communication (DNA-MC) system and concentration-based molecular communication (MC) system under the same parameter setting, and the peak value of capacity of DNA-MC system can achieve 0.08 bps, while the capacity of MC system remains 0.025 bps. The simulation results show that DNA-MC system has obvious advantages over MC system in saving molecular resources and improving transmission stability.

A development of security system for transmission data in the internetwork (인터네트워크에서의 전송데이타 보호시스템 개발)

  • 박영호;이국희;문상재
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.35S no.4
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    • pp.1-9
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    • 1998
  • This paper developments asecurity system for transmission data in the internetwork. Intermediate system of our model does not fulfill security service of confidentiality but authentication and integrity. Thus this model knows whether the transmission data on the intermediate system is authentic and integral or not, and it is practical and easy to be developmented. This system is developmented using a ONP of USL which prvides environments of the open system.

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Effective Compensation of the Distorted 1.12 Tbps WDM Signals Using Optimization of Total Dispersion

  • Lee, Seong-Real
    • Journal of information and communication convergence engineering
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    • v.5 no.4
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    • pp.377-381
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    • 2007
  • Nonlinear effects and chromatic dispersion are the main causes of pulse degradation in high bit-rate WDM transmission systems and several architectures have been proposed to compensate them by means of optical phase conjugation. In this paper, a new method to exploit an optical phase conjugator (OPC) for nonlinearity and dispersion cancellation is disclosed. The proposed method is using optimal total dispersion of each fiber sections and it is simpler than those previously described in literature. Power penalty between WDM channels and the maximum launch power in $28{\times}40$ Gbps WDM transmission system designed by optimal total dispersion are more decreased and more increased than those in the conventional WDM transmission system with OPC, respectively. Furthermore, optimal total dispersion proposed in this research should provide the flexible design of WDM system, which less depends on OPC position.

Maximum Ratio Transmission for Space-Polarization Division Multiple Access in Dual-Polarized MIMO System

  • Hong, Jun-Ki;Jo, Han-Shin;Mun, Cheol;Yook, Jong-Gwan
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.8
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    • pp.3054-3067
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    • 2015
  • The phenomena of higher channel cross polarization discrimination (XPD) is mainly observed for future wireless technologies such as small cell network and massive multiple-input multiple-output (MIMO) system. Therefore, utilization of high XPD is very important and space-polarization division multiple access (SPDMA) with dual-polarized MIMO system could be a suitable solution to high-speed transmission in high XPD environment as well as reduction of array size at base station (BS). By SPDMA with dual-polarized MIMO system, two parallel data signals can be transmitted by both vertically and horizontally polarized antennas to serve different mobile stations (MSs) simultaneously compare to conventional space division multiple access (SDMA) with single-polarized MIMO system. This paper analyzes the performance of SPDMA for maximum ratio transmission (MRT) in time division duplexing (TDD) system by proposed dual-polarized MIMO spatial channel model (SCM) compare to conventional SDMA. Simulation results indicate that how SPDMA utilizes the high XPD as the number of MS increases and SPDMA performs very close to conventional SDMA for same number of antenna elements but half size of the array at BS.