• Title, Summary, Keyword: RF Link

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Modeling and Analysis of Link Initialization Access of RE-DSRC (RF-DSRC 링크초기접속 모델링 및 분석)

  • Lee Min-Heui;Kwag Su-Jin;Jung Jong-In;Lee Sang-Sun
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.4 no.2
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    • pp.23-31
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    • 2005
  • ITS(Intelligent Transportation System) implementing information collection services and information support services for cars of moving fast needs a communication system of special aim such as RF-DSRC(Radio Frequency Dedicated Short Range Communication). Before RSE(Road Side Equipment) and OBE(On-Board Equipment) will be able to communicate RF-DSRC, OBE first have to request Link Initialization Access using ACTC(Activation Channel) in allocated ACTS(Activation Slot) by Slotted ALOHA. Even though Link Initialization Access is a important element to decide performance of communication system, optimal mathematic modeling study of Link Initialization Access which is adapted RF-DSRC characteristics is not enoush. So, in this paper, we propose mathematical modeling about Link Initialization Access of RF-DSRC. And then we computed Link Initialization Access probability defining offer load(G) which is adapted RF-DSRC characteristics for analyzing performance of modeling.

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The Analysis of RF System and Communication Link for improvement in reliability of Smart UAV Data-Link (Smart-UAV 데이터링크 신뢰성 향상을 위한 RF 시스템 및 통신 링크 분석)

  • Hwang, In-Yong;Yu, Kap-Seon;Kim, Hak-Sun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.2A
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    • pp.66-79
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    • 2005
  • In this paper, we have performed the analysis of RF transceiver system and communication link for the improvement in reliability of Smart-UAV(Unmanned Aerial Vehicles) Data-Link. The system analysis performed using the development specification of the data link and data sheet of using components through the system simulation tool that is Agilent EEsof ADS. Also, the communication link analysis peformed using a variety of propagation models for the smart UAV operation environments. As a result, we have presented problems appeared in the simulation results and development specification. As well as, we have presented about several problems and consideration issue for system design through the communication link analysis.

Performance Analysis of Optical SCM Link System for CDMA RF Signal Transmission (CDMA RF 신호 전송을 위한 SCM 광링크 시스템의 성능분석)

  • 유진태
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.9B
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    • pp.1542-1550
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    • 2000
  • Fiber optic link systems based on SCM scheme are widely used as efficient and economic RF signal links between base station and a central station in mobile communication networks. However, its performance can be seriously limited depending on the operational conditions of not only the optical transmission system but also the wireless link in various environments. In this paper, we propose an analytic model for performance analyses of the SCM fiber optic link for CDMA RF signal transmission in various link environments. We present optimal operational conditions taking account of the nonlinear effects of the optical transmission system, and the multiple access interference produced at the wireless link. It has been shown through the BER analyses in this paper that the selection of optical modulation index of the SCM fiber optic links can be found optimally to minimize the fiber optic link noises and intermodulation distortion due to LD.

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Analysis of the RF Link Design for ETCS and Study on the Communication Zone by the Antenna Beam Pattern (ETCS용 RF 링크 설계와 안테나 빔 패턴에 의한 통신 영역 연구)

  • Yim Choon-Sik;Ha Jae-Kwon;Ahn Dong-Hyun
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.3 no.1
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    • pp.21-30
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    • 2004
  • This paper describes the design of RF link between RSE and OBU of ETCS and the analysis of the antenna beam pattern to get a proper communication area in the cross direction and traveling direction of lanes. This stage should be performed prior to determination of system requirements of ITS service based on active DSRC. This study is important and fundamental technical analysis to design and implement base station of ETCS.

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Conceptual Design of the RF Links for KASS Satellite Communication System (KASS 위성통신시스템 RF 링크 기본 설계)

  • You, Moonhee;Sin, Cheon Sig
    • Journal of Satellite, Information and Communications
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    • v.11 no.3
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    • pp.12-17
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    • 2016
  • ICAO (International Civil Aviation Organization) recommends the introduction of SBAS (Satellite Based Augmentation System) in 2025, which provides GNSS (Global Navigation Satellite System) correction data and the ranging signal via GEO (geostationary earth orbit) satellites to GNSS users. In this paper, we present the basic design results of the satellite communication system RF link for the Korean SBAS systems, KASS (Korea Augmentation Satellite System) which is going on the development & implementation. KASS RF link was designed in consideration of both the C-band and Ku-band uplinks to meet the international standard requirements for the SBAS system, and identified the minimum EIRP and G/T performance of the KASS uplink station for each frequency band. These analysis results for the RF link design are expected to be used for an effective design of the subsystem specifications for KASS satellite communication system.

RF Transceiver Design and Implementation for Common Data Link (공용 데이터링크 RF 송수신기 설계 및 구현)

  • Kim, Joo-Yeon
    • Journal of IKEEE
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    • v.19 no.3
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    • pp.371-377
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    • 2015
  • This paper is about the RF transceiver designed and implementation for common data link. The trasmitter is configured as a frequency up-converter, a power amplifier and a duplexer. The receiver is configured as a duplxer, a frequency down-converter and a low noise amplifier. The maximum transmission distance, the reception sensitivity is designed to meet the electrical and temperature characteristics and the like. Using a modeling and simulation in order to meet the requirements of the RF transceiver has been designed and implemented. Transmitting output power and Noise Figure has been measured with 38.58dBm and 5.5dB, respectively. All of the electrical and temperature specifications was meet. Was confirmed all of the requirement specification by electrical characteristics test and temperature characteristics test.

A SYSTEM DESIGN AND ANALYSIS FOR SATELLITE COMMUNICATION LINK

  • Chung, Tae-Jin;Eun, Jong-Won
    • Journal of Astronomy and Space Sciences
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    • v.17 no.2
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    • pp.257-266
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    • 2000
  • A satellite RF communication link is analyzed based on a simple fundamental equations by systematic approach in this paper. The number of variables related to a design and analysis of satellite RF link is often a dozen or more, thus it is a tedious and time-consuming task. With the given input data, the important parameters are calculated step by step and three communication characteristics such as communication channel capacity, carrier-to-noise ratio(CNR) at the satellite and ground station are analyzed. It gives very useful information to the system engineers for designing and analyzing the overall satellite communication system in the conceptual design phase.

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Performance Analysis of Mixed RF/FSO Dual-hop Transmission with Switch-and-Stay Combining (Switch-and-Stay Combining 기반 Mixed RF/FSO Dual-hop 전송 시스템 성능 분석)

  • Hwang, Kyu-Sung
    • Journal of Korea Multimedia Society
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    • v.21 no.4
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    • pp.493-498
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    • 2018
  • In this paper, we provide the performance analyses of a dual-hop amplify-and-forward(AF) relay transmission composed of asymmetric radio-frequence(RF) and free-space optical(FSO) links. In the mixed RF/FSO system, a relay is equipped with two receive antennas for RF signals and one additional transmit antenna for FSO signals. In order to improve a performance of RF link, a switch-and-stay (SSC) diversity technique is applied at the relay which can provide a proper link performance with a low complexity. Specifically, we offer the performance analyses of the proposed system in terms of outage probability and secrecy outage probability. In numerical examples, we compare the system performances with no diversity and selection combining systems and verify our analytical results via computer-based Monte-Carlo simulations.

DEVELOPMENT OF TRACKING SYSTEMS APPLICABLE TO SPACE LAUNCH VEHICLE

  • Kim Sung-Wan;Hwang Soo-Seul;Lee Jae-Deuk
    • Bulletin of the Korean Space Science Society
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    • pp.247-250
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    • 2004
  • Tracking systems for launch vehicle consist mainly of radar transponder (beacon), RF switch or power divider, antennas as onboard system, and single or multiple radars as ground one. In this paper, tracking systems, which are applicable to KSLV (Korea Space Launch Vehicle)-l, are introduced and the electrical performances for developed prototypes are presented. We have also performed RF link analysis for both uplink and downlink, and estimated that the maximum distance to be able to track KSLV-l stably is dependent on uplink characteristic in our system.

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