• 제목/요약/키워드: Tranceiver

검색결과 33건 처리시간 0.024초

900MHz대 FDD방식을 이용한 선내용 Tranceiver에 관한 연구 (A Study on the 900MHz FDD Tranceiver for the Vessel)

  • 송면규;조학현;김정년
    • 한국정보통신학회논문지
    • /
    • 제2권3호
    • /
    • pp.359-365
    • /
    • 1998
  • The portable two way radio telephone amongst GMDSS equipment in the vessel is very important portable wireless one for search and rescue in distress situation. Although the portable two way radio telephone must be equipped with in the vessel by IMO & RR, other kinds of wireless tranceivers are widely used to communicate with crew members who are separately appointed at bridge forecastle and poop in leaving or arriving at the port, passing through a narrow canal or voyaging in the foggy weather, Most of those wireless tranceivers except portable two way radio telephone are allocated at 27MHz band with PTT simplex system that makes crew members difficult to work effectively in the vessel. In this research 900MHz band FDD(frequency duplex division) tranceiver system is studied to help crew members in the vessel to communicate with themselves freely and to work easily meanwhile with simple operation. 900MHz band FDD tranceiver system uses one chip FM frontend IC to realize the miniaturization and downsizing of tranceiver and small size head set attached to helmet. The credibility of this research's result is highly evaluated by circuit analysis with computer aided simulation, and partly modified 900MHz band cordless phone circuit.

  • PDF

900MHz대 FDD 방식을 이용한 선내용 Tranceiver에 관한 연구 (A Study on the 900MHz FDD Tranceiver for the Vessel)

  • 김정년;조학현;송면규;김기문
    • 한국정보통신학회:학술대회논문집
    • /
    • 한국해양정보통신학회 1998년도 춘계종합학술대회
    • /
    • pp.365-370
    • /
    • 1998
  • The portable two way radio telephone amongst GMDSS equipment in the vessel is very important portable wireless one for search and rescue in distress situation. Although the portable two way radio telephone must be equipped with in the vessel by IMO RR, other kinds of wireless tranceivers are widely used to communicate with crew members who are separately appointed at bridge forecastle and poop in leaving or arriving at the port, passing through a narrow canal or voyaging in the foggy weather. Most of those wireless tranceivers except portable two way radio telephone are allocated at 27MHz band with PTT simplex system that makes crew members difficult to work effectively in the vessel. In this research 900MHz band FDD(frequency duplex division) tranceiver system is studied to help crew members in the vessel to communicate with themselves freely and to work easily meanwhile with simple operation. 900MHz band FDD tranceiver system uses one chip FM frontend IC to realize the miniaturization and downsizing of tranceiver and small size head set attached to helmet. The credibility of this research's result is highly evaluated by circuit analysis with computer aided simulation. and partly modified 900MHz band cordless phone circuit.

  • PDF

A 900MHz RP CMOS Power Amplifier for Wireless One-chip Tranceiver

  • Yoon, Jin-Han;No, Ju-Young;Son, Sang-Hee
    • 대한전자공학회:학술대회논문집
    • /
    • 대한전자공학회 2002년도 ITC-CSCC -2
    • /
    • pp.782-785
    • /
    • 2002
  • Power amplifier of wireless communication tranceiver can be effectually controlled output power. And small size and low power dissipation are indispensable to portable system. In this paper, to reduce the size of portable tranceiver, inductor is integrated in a single chip. And to reduce power dissipation, a power amplifier that can be digitally controlled output power, is proposed and designed.

  • PDF

Radar Signal Detecting & Processing 장치의 개발에 관한 연구 (A Study on the Development of Radar Signal Detecting & Processor)

  • 송재욱
    • 한국항해학회지
    • /
    • 제24권5호
    • /
    • pp.435-441
    • /
    • 2000
  • This paper deals with the development of RACOM(Radar Signal Detecting & Processing Computer). RACOM is a radar display system specially designed for radar scan conversion, signal processing and PCI radar image display. RACOM contains two components; i )RSP(Radar Signal Processor) board which is a PCI based board for receiving video, trigger, heading & bearing signals from radar scanner & tranceiver units and processing these signals to generate high resolution radar image, and ⅱ)Applications which perform ordinary radar display functions such as EBL, VRM and so on. Since RACOM is designed to meet a wide variety of specifications(type of output signal from tranceiver unit), to record radar images and to distribute those images in real time to everywhere in a networked environment, it can be applicable to AIS(Automatic Identification System) and VDR(Voyage Data Recorder).

  • PDF

One-chip 고주파 단말기에의 응용을 위한 고집적 HBT 다운컨버터 MMIC (A Highly Integrated HBT Downconverter MMIC for Application to One-chip RF tranceiver solution)

  • 윤영
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제31권6호
    • /
    • pp.777-783
    • /
    • 2007
  • In this work, a highly integrated downconverter MMIC employing HBT(heterojunction bipolar transistor) was developed for application to one chip tranceiver solution of Ku-band commercial wireless communication system. The downconverter MMIC (monolithic microwave integrated circuit) includes mixer filter. amplifier and input/output matching circuit. Especially, spiral inductor structures employing SiN film were used for a suppression of LO and its second harmonic leakage signals. Concretely, they were properly designed so that the self-resonance frequency was accurately tuned to LO and its second harmonic frequency, and they were integrated on the downconverter MMIC.

디지털 모뎀과 무전기를 이용한 경보 시스템 구축 (Building Alert System by using Digital Modem and Radio Tranceiver)

  • 한태규;오휘빈;이용환;이준환;이상범
    • 한국컴퓨터산업교육학회:학술대회논문집
    • /
    • 한국컴퓨터산업교육학회 2003년도 제4회 종합학술대회 논문집
    • /
    • pp.11-16
    • /
    • 2003
  • In this thesis, we talk about 'Example of Building Alert System by Radio Packet Modem and Radio Tranceiver' faster than CDMA method in Wireless Communication. Moreover this type of System is enough to be economic. we show example of building Alert System by using this method.

  • PDF

고속 주파수 합성기를 이용한 FH-SS 송수신기의 채널 효율 개선 연구 (A Study on the Improvement of channel efficiency for FH-SS Tranceiver by applying the Frequency synthesizer with high speed switching time.)

  • 김재향;김기래
    • 한국정보통신학회:학술대회논문집
    • /
    • 한국해양정보통신학회 2001년도 춘계종합학술대회
    • /
    • pp.197-200
    • /
    • 2001
  • 최근의 확산대역 통신 방식에 사용되는 주파수 합성기는 주파수 스위칭 시간이 중요한 요소가 되고 있다. FH-SS(Frequency Hopping Spread Spectrum) 송수신기에서 고속 주파수 합성기 설계는 채널 효율을 높이기 위해 매우 중요하다. 본 논문에서는 기존 PLL방식에 직접 접근 주파수 합성 (DDS) 방식을 응용하여 1 $\mu\textrm{s}$ 이하의 스위칭 시간을 갖는 고속 주파수 합성기를 설계하고, 이를 2.4GHz 대리의FH-SS 송수신기에 적용하여 시뮬레이션 결과 20% 이상의 채널 효율 개선 효과를 얻었다.

  • PDF

직교 변.복조기의 채널불균형 보정특성 (Compensation characteristics of channel imbalance in quadrature modulator and demodulator)

  • 정창규;박한규
    • 한국통신학회논문지
    • /
    • 제21권8호
    • /
    • pp.2055-2062
    • /
    • 1996
  • This paper presents a method of compensating for the gain and phase imbalance of quadrature modulator and demodulator. The gain and phase imbalance are compensated using the received power after the compensation pattern was transmitted at tranceiver. The proposed method is less vulnerable to changes in the transmission channel than the conventional method because compensation is made possible within the tranceiver system, and even the change in phase mblance in accordance with frequency can be compensated utilizing the adaptive algorithm. According to numerical results, a normalized eye opening and a bit error rate are improved by 1.8dB and 3.8dB, respectively.

  • PDF

주파수 도약2진 비코히어런트 FSK송수신기 실현에 관한 연구 (A Study on the Implementation of Frequency Hopping Binary Noncohrent FSK Tranceiver)

  • 박영철;김재형;차균현
    • 한국통신학회논문지
    • /
    • 제15권3호
    • /
    • pp.260-268
    • /
    • 1990
  • 본 논문에서는 도약속도를 높이기 위하여 이중 주파수 합성기를 도입하였으며 시스템을 간략화하기 위하여 다음의 몇가지 방식을 제안하였다. PLL 루프에 직접 FSK 변조를 하기 위해 VCO의 이득을 선형화시켰으며, 2개의 수동상관기를 이용하여 코드동기를 얻을 수 있는 수정된 정합 필터 방식을 제안하였다.

  • PDF

Antipodal 초광대역 통신 시스템의 변·복조기 설계 (Design of Pulse Tranceiver for Antipodal Ultra Wideband System)

  • 이정석;김유창;김원후
    • 한국항행학회논문지
    • /
    • 제5권2호
    • /
    • pp.134-140
    • /
    • 2001
  • 한정된 주파수 문제를 해결하기 위해 제안된 초광대역 통신 시스템은 전 주파수 대역에 걸쳐 스펙트럼이 마치 기저 대역 잡음과 유사한 형태로 존재하여 타 통신 시스템에 간섭을 주지 않고 고속의 통신이 가능하며, 반송파를 사용하지 않기 때문에 송 수신기의 소비 전력과 그 구조를 간략화 시킬 수 있다. 그러나 기존의 펄스위치 방식 (Pulse Positioning Modulation : PPM)은 주파수 스펙트럼 상에 불연속 전력 스펙트럼 성분이 존재하여 시스템의 효율을 저하된다. 본 논문에서는 불연속 전력 스펙트럼 성분이 발생하지 않고, 유클리드 거리가 최대가 될 수 있는 Antipodal 신호를 제안한다. 또한, 고주파 시뮬레이터인 Agilent사의 Advanced Design System을 사용하여 Antipodal 신호를 이용한 변 복조기를 설계하여 구현 및 적용 가능성을 보였다.

  • PDF