• Title/Summary/Keyword: frequency shift keying (FSK)

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Performance of pilot-based signal detection for digital IoT doorlock system (디지털 도어락 시스템을 위한 파일럿 기반 신호검출 성능)

  • Lee, Sun Yui;Hwang, Yu Min;Sun, Young Ghyu;Yoon, Sung Hoon;Kim, Jin Young
    • Journal of IKEEE
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    • v.22 no.3
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    • pp.723-728
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    • 2018
  • This paper proposes a signal detection method for IoT door lock system which is a new application field of VLC (Visible Light Communication). This paper describes the signal detection technique for user recognition that needs to be overcome in order to apply VLC to door lock system which has a demand for new technology due to security issue. This system has security and high signal detection characteristics because it uses existing infrastructure to communicate with visible light. In order to detect the signal using FFT, the signal of the user who accesses the authentication channel based on the pilot signal is detected, and the performance of the false alarm probability and detection probability is shown in the channel model.

Performance Evaluation of Hybrid DS/SFH-CDMA Noncoherent MFSK Signal with Channel Coding and MRC Diversity Techniques in Mobile Communication Nakagami Fading Channels (이동통신 Nakagami 페이딩 채널에서 채널코딩과 최대비합성 다이버시티 기법에 의한 Hybrid DS / SFH-CDMA 비동기 MFSK 신호의 성능평가)

  • ;Norihiko Morinaga
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.8 no.4
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    • pp.342-353
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    • 1997
  • This paper presents an analytical evaluation of a hybrid direct-sequence/slow frequencyhopped code division multiple-access (DS/SFH-CDMA) system employing noncoherent M-ary frequency shift keying(MFSK) modulation in a multiple Nakagami fading (m) environment. Multipath interference (MPI) and multi-access interference (MAI) is taken into account and the spectral efficiency is calculated for uncoded as well as channel coding systems. Predetection multipath maximal ratio combining (MRC) diversity in conjunction with interleaved channel coding (Hamming(7,4) code, BCH(15, 7) code and RS (7, 4), (15, 9)) code ) is employed for improving the bit error rate (BER) performance. The BER of noncoherent hybrid system is obtained using a Gaussian interference approximation.

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Multiple Access Capability of Digital IoT Doorlock System for Smart Building (스마트빌딩용 디지털 IoT 도어락 시스템의 다중접속 능력)

  • Lee, Sun-Yui;Sun, Young-Ghyu;Sim, Issac;Hwang, Yu-Min;Yoon, Sung-Hoon;Cha, Jae-Sang;Kim, Jin-Young
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.18 no.6
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    • pp.99-105
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    • 2018
  • This paper proposes multiple access method for smart doorlock system using VLC(Visible Light Communication) with color grid modulation method. The proposed method is to connect multiple visible light signals using color grid modulation method in order to recognize and authenticate multiple users accessing doorlock. In order to enable visible light multiple access with existing infrastructure, the symbol energy interval of signal should be maximized. Thus, performance of system in VLC channel is measured by modulating symbols based on the proposed method. We confirm the actual channel test results of the modulated signal to implement doorlock system that recognizes the number of multiple access users.

A Study on Algorithm of the Integrated Communication System in Radio Station (무선국의 통합 시스템에 대한 알고리즘의 연구)

  • 조학현;최조천;김기문
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.2 no.4
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    • pp.545-551
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    • 1998
  • The Radio communication by existing SSB, VHF, etc. in a coast station and a base station for military affairs is still used to a very important the device of information delivery or transmitting and receiving by the remote controller to using to the exclusive cable for a equipment established at a long distance. When a number of consumer to connected and operated by a number of transceiver is essential for a circuit controller of ICS, in KOREA, is devoted by import to considerable quantity because of to be delayed development of this field. This Paper has been realized to optimal algorithm and designing of a circuit connection controller by multi-processor to pre-stage for the development of ICS. The H/W is composed able to remote control to circuit connector with the several slave processor and a processor for master, and this has taken possible through without any obstacle to communication circuits of a control signal by FSK system. The S/W make possible monitoring for communication condition of other circuits by means of a serial communication system by the multi-processing. This paper has been studied for connecting to a circuits wished to rapidly and precisely by the full application to a interrupt technique. A technique to control by remote to a number of transceiver is a way increasing to application for a frequency resource of the limited MF/SF, VHF and the existing radio communication technique. According to, this paper will achieve to be the reduction of energy & equipment and multiplicity of information delivery in the general communication and disposal to rapid and exact for the important communication as distress, urgency and safety on the sea.

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