• Title/Summary/Keyword: RF-DSRC

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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 s.7
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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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Performance Analysis of IR/RF-DSRC for Improved High Density ITS Service (개선된 ITS 서비스 제공을 위한 IR/RF-DSRC 성능 분석)

  • Kwag, Su-Jin;Kim, Jea-Myoung;Lee, Sang-Sun
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.7 no.4
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    • pp.107-117
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    • 2008
  • OBE(On Board Equipment) of IR(Infrared)/RF(Radio Frequence)-DSRC(Dedicated Short Range Communication) are set up 1.25 million cars because Korea Highway Cooperation supplied in HiPass(Domestic Electronic Toll Collection System). But this DSRC system has strength and weakness of service for BIS(Bus Information System) or UTIS(Urban Traffic Information System) because BIS and UTIS are required vary high communication's performance and management. In this paper, Efficiency of IR/RF-DSRC is analyzed performance of MAC(Medium Access Control) by computer simulation for services of BIS or UTIS, so Suggested to be commensurated with medium of there service. Specially, DSRC is needed high mobility and throughput in the vary short communication range, so Analysed the transmission rate of data in each communication medium over the specific character of the MAC frame.

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A Low Noise and Low Power RF Front-End for 5.8-GHz DSRC Receiver in 0.13 ㎛ CMOS

  • Choi, Jae-Yi;Seo, Shin-Hyouk;Moon, Hyun-Won;Nam, Il-Ku
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.11 no.1
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    • pp.59-64
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    • 2011
  • A low noise and low power RF front-end for 5.8 GHz DSRC (Dedicated Short Range Communication) receiver is presented. The RF front-end is composed of a single-to-differential two-stage LNA and a Gilbert down-conversion mixer. In order to remove an external balun and 5.8 GHz LC load tuning circuit, a single-to-differential LNA with capacitive cross coupled pair is proposed. The RF front-end is fabricated in a 0.13 ${\mu}m$ CMOS process and draws 7.3 mA from a 1.2 V supply voltage. It shows a voltage gain of 40 dB and a noise figure (NF) lower than 4.5 dB over the entire DSRC band.

Data Rate Enhancement by using QPSK on Physical Layer of Korea Dedicated Short Range Communications (QPSK 변조를 통한 DSRC Data Rate 향상 방안)

  • Park, Jin-Young;Kim, Han-Kyoung;Jeon, Wang-Won
    • 한국정보통신설비학회:학술대회논문집
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    • 2007.08a
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    • pp.50-54
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    • 2007
  • 현재 국내에서 ITS(Intelligent Transport Systems) 통신방식으로 이 용되고 있는 DSRC 방식은 TTA(한국정보통신기술협회)의 기술표준으로서 대전시,전주시에 적용되어 BIS(Bus Information Service)에 이용되고 있고,최근 고속도로 ETCS(Electronic Toll Collection System)가 DSRC방식으로 전국고속도로 Tollgate 에서 2007년 연말에 개통될 예정이다. DSRC 방식은 2000년에 TTA(한국정보통신기술협회)에서 기술표준이 제정되어 현재 1Mbps 의 Data 용량을 가진다. DSRC 방식의 물리링크 변조방식은 ASK(Amplitude Shift Keying)로 ITS 확장 서비스 적용을 위해 변조방식을 QPSK(Quadrature Phase Shift Keying )로 개선하게 되면 이론적으로 4배의 Data Rate 향상이 이루어진다. 물리적인 RF 변조방식을 ASK에서 QPSK로 바꿔 간단히 Data Rate을 개선하게 되면 회로구현의 경제성이 향상되어 DSRC 응용 서비스가 활성화 될 것이다.

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A 5.8GHz SiGe Down-Conversion Mixer with On-Chip Active Batons for DSRC Receiver (DSRC수신기를 위한 능동발룬 내장형 5.8GHz SiGe 하향믹서 설계 및 제작)

  • 이상흥;이자열;이승윤;박찬우;강진영
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.4A
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    • pp.415-422
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    • 2004
  • DSRC provides high speed radio link between Road Side Equipment and On-Board Equipment within the narrow communication area. In this paper, a 5.8 GHz down-conversion mixer for DSRC communication system was designed and fabricated using 0.8 ${\mu}{\textrm}{m}$ SiGe HBT process technology and RF/LO matching circuits, RF/LO input balun circuits, and If output balun circuit were all integrated on chip. The chip size of fabricated mixer was 1.9 mm${\times}$1.3 mm and the measured performance was 7.5 ㏈ conversion gain, -2.5 ㏈m input IP3, 46 ㏈ LO to RF isolation, 56 ㏈ LO to IF isolation, current consumption of 21 mA for 3.0 V supply voltage.

A 5.8 GHz SiGe Up-Conversion Mixer with On-Chip Active Baluns for DSRC Transmitter (DSRC 송신기를 위한 능동발룬 내장형 5.8 GHz SiGe 상향믹서 설계 및 제작)

  • Lee Sang heung;Lee Ja yol;Kim Sang hoon;Bae Hyun cheol;Kang Jin yeong;Kim Bo woo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.4A
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    • pp.350-357
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    • 2005
  • DSRC provides high speed radio link between Road Side Equipment and On-Board Equipment within the narrow communication area. In this paper, a 5.8 GHz up-conversion mixer for DSRC communication system was designed and fabricated using 0.8 m SiGe HBT process technology and IF/LO/RF matching circuits, IF/LO input balun circuits, and RP output balun circuit were all integrated on chip. The chip size of fabricated mixer was $2.7mm\times1.6mm$ and the measured performance was 3.5 dB conversion gain, -12.5 dBm output IP3, 42 dB LO to If isolation, 38 dB LO to RF isolation, current consumption of 29 mA for 3.0 V supply voltage.

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 s.4
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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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Performance Analysis of DSRC Transmission Efficiency at MAC Layer (MAC 계층에서의 DSRC 전송 효율 분석)

  • Kwag Su-Jin;Ahn Jin-Ho;Lee Sang-Sun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.6B
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    • pp.527-533
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    • 2006
  • In this paper, we analyze the performance of MAC (Media Access Control) layer in DSRC (Dedicated Short Range Communication). It will be widely applied for ITS (Intelligent Transportation System) services; for example ETC (Electric Toll Control), BIS (Bus Information System) etc., needed to small packet size. But If ITS service is evolving to advance ITS, ADIS (Advanced Driver Information Systems) and AVHS (Advanced Vehicle Highway System) etc, be needed larger packet size. In the future, it may offer more various services such as traffic information, collection, and multimedia information. There are two kind of physical media, IR(Infrared) and RF(Radio frequency). And each system has their own protocol that is adaptive in special characteristics of physical medium for using efficiently limited radio resources. In this paper, we analyze the special characteristics of each system. And we study practical use of some related services expected to be used in the near future, by analyzing the transmission efficiency in each DSRC system.

RFID based the SME algorithm for the multi-lane-supproted ETCS (다차선 서비스를 제공하는 자동요금징수시스템을 위한 RFID 기반 SME 알고리즘)

  • Cha, Jin;Jung, Jong-In;Jang, Sang-Woo;Lee, Sang-Sun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.1C
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    • pp.8-16
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    • 2012
  • In order for the support of the ETCS (Electronic Toll Collection System) model, which have been operated successfully till now, with multi-lane service, the wireless communication system of the multi-lane-supported ETCS based on RF-DSRC (Radio Frequency - Dedicated Short Range Communication) was used. In this paper, the SME algorithm attaching data flow and form into RFID communication technology was newly suggested to overcome technical problems on RF-DSRC communication system. In addition, in order to verify the SME algorithm, experiments based on ETCS and 900Mhz RFID were carried out. From the result of realization experiment of RFID dependent on the velocity and precision experiment of information inside of RFID, we can see that RFID is detected below 70Km/h and the precision of estimation is more than 90%.