• Title/Summary/Keyword: ASK Modulation

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A Study on Underwater Visible Light Communication using ASK Modulation (ASK 변조를 이용한 수중 가시광 통신에 관한 연구)

  • Son, Jin-Hwan;Kim, Seong-Min;Sung, Kyu-Youl;Kwon, Se-Ik;Kim, Nam-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2016.10a
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    • pp.579-582
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    • 2016
  • Recently, wireless communication system has been widely used in a variety of fields along with the remarkable advancement of communication technology. Sound communication system in underwater wireless communication is utilized in underwater communication since it has better transmission capacity than the existing RF. However, sound communication system has the problems such as low speed communication, transmission delay and limited bandwidth, and the studies have been actively conducted on the visible light communication underwater to improve these problems. Therefore, the visible light communication underwater using ASK modulation is suggested for the effective communication in this article.

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UHF RFID Hand-Held Transceiver System with Multi-protocol and Multi-Standard supplements (Multi-Protocol/Multi-Standard 지원 UHF RFID 휴대용 리더 시스템)

  • Park, Kyong-Tae;Roh, Hyoung-Hwan;Park, Jun-Seok
    • 한국정보통신설비학회:학술대회논문집
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    • 2007.08a
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    • pp.147-150
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    • 2007
  • This paper presents an advanced RFID reader system implementing multi-protocols and multi-standards at 900MHz. In accordance with the strict regulations specified by ISO 18000-6 B-Type and EPC Global Gen 2, we have designed corresponding systemic factors which meet the domestic radio frequency utilizing bands of 910-914MHz. In addition, we develop numerous crucial factors of system compatibility options including SSB (Single-Side Band) and DSB (Double-Side Band) specifications, also OOK (On-Off Keying), ASK (Amplitude Shift Keying) and PR-ASK (Phase Reversed-Amplitude Shift Keying) modulation formula. Remarkable technical features of system in this paper can be the direct conversion routines using I/Q Modulation/Demodulation respectively, and Full-Duplex formulation operating at identical frequency bands.

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Several systems for 1Giga bit Modem

  • Park, Jin-Sung;Kang, Seong-Ho;Eom, Ki-Whan;Sosuke, Onodera;Yoichi, Sato
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.1749-1753
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    • 2003
  • We proposed several systems for 1Giga bit Modem. The first, Binary ASK(Amplitude Shift Keying) system has a high speed shutter transmitter and no IF(Intermediate Frequency) receiver only by symbol synchronization. The advantage of proposed system is that circuitry is very simple without IF process. The disadvantage of proposed system are that line spectrum occurs interference to other channels, and enhancement to 4-level system is impossible due to its large SNR degradation. The second, Binary phase modulation system has a high speed shutter transmitter and IF-VCO(IF-Voltage Controlled Oscillator) control by base-band phase rotation. Polarity of shutter window is changed by the binary data. The window should be narrow same as above ASK. The advantage of proposed system is which error rate performance is superior. The disadvantage of proposed system are that Circuitry is more complex, narrow pull-in range of receiver caused by VCO and spectrum divergence by the non-linear amplifier. The third, 4-QAM(Quadrature Amplitude Modulation)system has a nyquist pulse transmitter and IF-VCO control by symbol clock. The advantage of proposed system are that signal frequency band is a half of 1GHz, reliable pull-in of VCO and possibility of double speed transmission(2Gbps) by keeping 1GHz frequency-band. The disadvantage of proposed system are that circuit complexity of pulse shaping and spectrum divergence by the non-linear amplifier.

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Implementation of UHF RFID Tag Emulator (UHF 대역의 RFID 태그 에뮬레이터 구현)

  • Park, Kyung-Chang;Kim, Hanbyeori;Lee, Sang-Jin;Kim, Seung-Youl;Park, Rae-Hyeon;Kim, Yong-Dae;You, Young-Gap
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.46 no.11
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    • pp.12-17
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    • 2009
  • This paper presents a tag emulator for a UHF band RFID system. The tag emulator supports the 1800-6C and EPC global class 1 generation 2 standards. The transmitted signal from a reader is generated using the PIE coding and ASK modulation methods. Signals of a tag are from the FM0 coding and ASK modulation methods. The ARM7 processor carries out the overall control of the system and signal analysis of incoming data. The verification of the tag emulator employs the application platform implemented in C++. Users can define parameter values for protocol during the application run. The tag emulator presented in this paper allows evaluating various design alternatives of the target RFID system in real applications.

Automatic Identification of Digital Modulation Methode Using an Artification Neural Network (신경망을 이용한 디지털 변조방식의 자동식별)

  • 신용조
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.10B
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    • pp.1769-1776
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    • 2000
  • In this paper a new method is proposed to identify a modulation method in the case of unknown digitally modulated input signals. The proposed identification method is implemented with an artificial neural network which is based on characteristic feature extracted from the instantaneous amplitude the instantaneous phase and the instantaneous frequency of the input signals. The proposed method was simulated with 9 type signals (ASK2, FSK2, FSK4, PSK2, PSK4, PSK8, QAM8, QAM16) in a noisy communication environment. The results show that the artificial neural network can accurately recognize all kinds of patterns.

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Influence of Impulsive Random Noise on Digital Modulation System in Electromagnetics Interference Environments (전자간섭 환경하에서 임펄스성 랜던잡음이 디지틀 변조방식에 미치는 영향)

  • 공병옥;손승완;조성준
    • Proceedings of the Korean Institute of Communication Sciences Conference
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    • 1984.10a
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    • pp.28-36
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    • 1984
  • The error rate performances of digital modulation systems which are influenced by impulsive noise have been studied in the environment of electromagnetic interference(EMI). We have derived the error probability equations of L-level ASK, M-ary PSK, MSK, QAM, and APK signals. Using these derived equations, we have evaluated the performance of each system and compared each other.

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Study of Optical Transmission Performance in IP-over-WDM Networks Based on FSK/ASK Combined Modulation Format

  • Xiangjun, Xin;Andre, Paulo Sergio de Brito;Teixeira, Antonio Luis Jesus;Monteiro, Paulo P.;Rocha, Jose R. F. da
    • ETRI Journal
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    • v.27 no.3
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    • pp.267-272
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    • 2005
  • The transmission performance of optical labeling based on a combined frequency shift keying/amplitude shift keying (FSK/ASK) format is studied by numerical simulation. The simulation demonstrates that the bit-error ratio (BER) characteristic of an ASK signal is limited by the extinction ratio, received optical power, and dispersion, simultaneously. However, an FSK signal is mainly limited by the extinction ratio (ER) and received optical power when the peak spectrum, which is used to detect the FSK signal, is relatively narrow.

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Design of a 900 MHz High-linear CMOS Frequency Up-converter for an ASK Modulator application (ASK 변조기 응용을 위한 900 MHz 대역 고선형 CMOS 상향 주파수 혼합기 설계)

  • Jang, Jin-Suk;Chae, Kyu-Sung;Kim, Chang-Woo
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.443-444
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    • 2008
  • A double-balanced frequency up-converter using the Gilbert cell structure has been designed with the TSMC $0.18\;{\mu}m$ CMOS library. The frequency up-converter consists of a Mixer core and IF / LO balun. Frequency Up-converter exhibits a 3.4 dB conversion gain with a - 7.6 dBm $P_{1dB}$ for IF power of -10 dBm and LO power of 0 dBm inputs. It also exhibits 92.2 % modulation depth as a ASK modulator.

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Performance Analysis of ASK-SSB and PSK-SSB Modulation Format in High-Speed and High-Density WDM Transmission Systems (고속 고밀도 WDM 광전송 시스템에서의 ASK-SSB와 PSK-SSB 변조 방식의 성능 분석)

  • Park Jin-Young;Choi Yoon-Hee;Park Sang-Gyu
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.12
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    • pp.23-32
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    • 2004
  • This research investigates the performance of the optical transmissions systems using the SSB modulation format The focus was on the spectral efficiency of the WDM systems and the transmission penalties due to the fiber nonlinearities. By investigating the performance obtained with ideal SSB signal, we set the upper limit of the performance which can be obtained by SSB technology. Furthermore, we investigated the performance obtainable with SSB signals which can be generated with realizable devices. Since SSB formats are more susceptible to the fiber nonlinearities, SSB formats exhibited inferior transmission performances compared to the DSB format. However, within the 500~1000 km transmission range, which is the focus of this research, it was found that the WDM systems with 12.5 GHz channel spacings might benefit from the SSB modulation techniques.

Influence of Impulsive Random Noise on Digital Modulation Systems in Electromagnetic Interference Environments (전자간섭 환경하에서 임펄스성 랜덤잡음이 디지틀 변조방식에 미치는 영향)

  • 조성준;공병옥
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.10 no.1
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    • pp.17-30
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    • 1985
  • The error rate performances of digital modulation systems in fluenced by impulsive noise have been investigated and discussed in the enviroment of electromagnetic interference(EMI). Using the derived equations for the probabilities of error of L-level ASK, M-ary PSK, MSK, QAM, and APK signals, the error rate performance of each system has been evaluated and compared each other. The results show that, in the case of gaussian noise enviornment, PSK system is superior to the other systems and the digital amplitude modulation systems are inferior on the contrary. In the environment of impulsive noise, the MSK at low interfere level shows the best error rate performance but in the high level interferer environment, the PSK shows the best error rate performance. Also it is known that the digital amplitude modulation systems are scarcely influenced by the variation of interfere level.