• The Transactions of the Korean Institute of Electrical Engineers D
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• v.53 no.5
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• pp.345-352
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• 2004

Currently, high data rate PLC(Power Line Communications), up to 100 Mbps, which use frequency bandwidth between 2 MHz and 30 MHz is investigated very hard, and commercial PLC modem for low voltage powerline network (indoor) is coming soon into communication market. For the purpose of developing a fit communication system which has little distortion of signal and attenuation, it is surely necessary to know about channel environments of powerline. Especially, the impedance measurement of the powerline and impedance matching are very important. As is known, since medium-voltage powerline (22.9 ㎸) is still working, it is not so simple to measure the powerline impedance. In our study, a portable impedance measurement equipment is developed. It consists of coupling capacitor, a drain coil and impedance matching transformer. The equipment is easily connected to medium voltage line and impedance of power line is measured using a network analyzer. Also, measurement results are used for impedance matching of PLC signal. In fact, matching transformer with several different impedances are used. The matching transformer is connected between coupling capacitor and signal port. In this paper, the developed portable impedance measurement equipment and impedance measurement results are presented. Also impedance matching technique using matching transformers will be explained. We showed the result of the improved performance by the impedance matching.

• Proceedings of the KIEE Conference
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• 2006.07d
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• pp.2009-2010
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• 2006

This paper presents an adaptive line coupler to match input impedance of the Power line Communication(PLC) modem between access impedance of the power line. This line coupler provides maximum signal power transmiting capability, high reliability. The structure of this coupler is simple and designed to make a easy and low cost. The proposed line coupler is suitable for Amplitude Shift Keying(ASK) or Phase Shift Keying(PSK) modem. To figure out our models, the analysis of the transmitting features of power line channel is performed in the time domain at the carrier frequency. As a result of this study, we present the values of capacitors in the capacitor bank and adaptive line coupler circuit.

• Proceedings of the IEEK Conference
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• 2001.06e
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• pp.157-160
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• 2001

We studied about the lighting control system on pc using PLM(Power Line Modem). The PLM is composed of FSK IC-chip and the circuit for the power line communication. We developed the control program using visual c++ language on PC for dimming the lamps. In this paper dimming controller was made with PIC161F874 and its communication speed was 1200 boad rates.

• Proceedings of the Korea Multimedia Society Conference
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• 2003.05b
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• pp.86-89
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• 2003

본 논문에서는 현재 국내에서 활발히 연구 개발되고 있는 전력선 통신 모뎀의 공인 시험을 위한 요구 사항을 분석하였다. 이를 위해 전력선 통신 기술의 표준화 및 기술 개발 동향과 Homeplug 표준화 단체에서 제시하는 전력선 통신 모뎀의 실험실 테스트 규정을 분석하였으며, 국내 전력선 통신 모뎀의 공인 시험을 위해서는 국내 전력선 통신 환경에 적합한 공인 시험 항목의 도출과 각 시험 항목별 시험 절차서 개발, 그리고 시험 결과에 대한 인중 체계의 수립이 필요함을 제시하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.5
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• pp.95-102
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• 2014

In this paper, we propose the high speed PLC-based automatic control system for a smart LED streetlight. The proposed the automatic control system were constructed of a power line modem part and monitoring part, streetlight controller part for the high speed communication frequency band and streetlight ballasts characterization and real-time remote control using a high-speed PLC network, and it was designed to meet to lighting grades conditions of KS road lighting standards. The proposed automatic control system were easy monitoring of the power consumption using PC through to the comparison result of the existing streetlight system. As a result, it was confirmed to the possibility of efficient operation for the real-time monitoring and maintenance by induction of reasonable power consumption through to the LED streetlight state checking and remote-control. In addition, we proved to improvement of expected effects for the power cost savings, the energy efficiency, and streetlight differentiation and advanced.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.10C
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• pp.1433-1443
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• 2004

The power line modem proposed in this paper transmits the remote control signal using CSK(Code Shift Keying) and DS/SS method. The CSK technique provides the increased capacity of transmission and robustness towards noise. Besides, the DS/SS technique provides protection against narrow-band Gaussian interference and multi-path interference. The modem supports full-duplex communication using FDD(Frequency Division Duplex) and the modem structure for forward link is same with that for reverse link. To switch each sub-controlled unit smoothly, 4/$\pi$-DQPSK is adopted for noncoherent demodulation. The PN code for spreading spectrum seues to divide each group which consists of sub-controlled units and Walsh code is used for the M-ary CSK technique. Each block is designed and verified with TMS320C5402 DSP. We show the superiority of the proposed method by analyzing numerically the system performance for the factors of the DS/SS and CSK method ullder additive white Gaussian noise and PBI.

• Proceedings of the IEEK Conference
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• 2002.07a
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• pp.591-594
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• 2002

This paper presents a systematic method of probing channel characteristics and communication reliabilities of home power line communication network applied to the Internet accessed control of home appliances. The effects of the three performance deteriorating factors, i.e., additive noise, channel attenuation, and intersymbol interference, can be systematically measured by applying the channel probing waveform in the frequency range from 100㎑ to 450㎑. Probability of bit error is derived with the probed channel parameters of the signal attenuation, noise and signal-to-interference ratio read in the frequency domain. The agreement between the derived probability of bit ewer and the measured probability of bit error support the validity of the proposed approach of probing home power line channel characteristics. The experimental results performed with the constructed test-bed applying the Proposed channel probing method and the operation reliability measurement of the overall networked system also support the feasibility of commercially deploying the PLC modem installed home appliances and their services for the Internet accessed home automation in densely populated residential apartment complexes.

• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.495-496
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• 2007

본 논문에서는 전력선 통신 모뎀에 필수적으로 사용하고 있는 AC 커플러의 대기모드 상태에서의 저전력 AC 커플러 개발에 관한 것으로, 전력선 통신(PLC : Power Line Communication) 모뎀은 디지털 가전기기를 위한 지능형 홈 네트워크 구축은 물론 원격검침 등의 각종 자동화 시스템에 활발하게 적용됨에 따라 저전력 대기모드 지원의 필요성이 요구되고 있다. 이러한 요구를 충족시키기 위해서 본 논문에서는 전력선 통신 모뎀에 필수적으로 사용하고 있는 AC 커플러의 대기모드 상태에서의 저전력 AC 커플러를 위해 1차측 AC 커플러를 송신측과 수신측으로 분리하여 설계하였다. 또한 수신 커플링 회로의 경우 현재 이용되고 있는 커플링 회로의 차단주파수를 10kHz에서 전력선 모뎀의 캐리어주파수에 영향을 미치지 않는 70kHz 고역 통과필터로 설계한다. 본 논문에서는 다양한 Simulation 및 실험을 통하여 제안된 AC 커플러가 기존 전력선 통신 모뎀과 동일한 성능을 유지하면서, 대기시 소모되는 소비전력을 크게 감소시켜, 기존 전력선 모뎀에 제안된 AC 커플러로 대치할 수 있음을 실험을 통해 규명하고 입증하였다.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.52 no.12
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• pp.696-701
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• 2003

This paper presents a systematic method of probing channel characteristics and communication reliabilities of home power line communication network applied to the Internet accessed control of home appliances. The effects of the three performance deterioating factors, i.e., additive noise, channel attenuation, and intersymbol interference, can be systematically measured by applying the channel probing waveform in the frequency range from 100KHz to 450KHz. Probability of bit error is derived with the probed channel parameters of the signal attenuation, noise and signal-to-interference ratio read in the frequency domain. The agreement between the derived probability of bit error and the measured probability of bit error supports the validity of the proposed approach of probing home power line channel characteristics. The experimental results performed with the constructed test-bed applying the proposed channel probing method also support the feasibility of commercially deploying the PLC modem installed home appliances and their services for the Internet accessed home automation.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.3
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• pp.288-293
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• 2010

In these information-communication society, the wireless system technologies are increasing to do all things with wireless solution for fast and convenient works. This trend drives ubiquitous solutions which are based on broadband wireless network that gives network connection whenever, everywhere. This paper deals a bookshelf management system using plower line communication and RFID module. This system includes a 900 MHz RFID reader, Passive RFID-Tags, an Atmeg128 microprocessor board attached LED Display Module, and a management PC with GUI Software. This system works well in power line communication, tag reading and LED display, and PC Management Software.