KR20030079048A - Method of power line communication - Google Patents

Method of power line communication Download PDF

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Publication number
KR20030079048A
KR20030079048A KR1020020017808A KR20020017808A KR20030079048A KR 20030079048 A KR20030079048 A KR 20030079048A KR 1020020017808 A KR1020020017808 A KR 1020020017808A KR 20020017808 A KR20020017808 A KR 20020017808A KR 20030079048 A KR20030079048 A KR 20030079048A
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South Korea
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signal
power line
frequency
line communication
section
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KR1020020017808A
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Korean (ko)
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김용태
이군석
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엘지전자 주식회사
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Priority to KR1020020017808A priority Critical patent/KR20030079048A/en
Publication of KR20030079048A publication Critical patent/KR20030079048A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5412—Methods of transmitting or receiving signals via power distribution lines by modofying wave form of the power source

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE: A power line communication method is provided to accurately recognize a signal irrespective of the phase delay and level attenuation of the signal by transmitting the signal to have the same frequency according to an interval and judging a communication signal on the basis of a frequency in a signal reception side. CONSTITUTION: A transmission side composes the entire signal so that a signal component, having a corresponding signal value classified reference frequency with respect to an interval corresponding to each bit of an original digital signal, is repeated. The transmission side transmits the composed signal. A reception side receives the transmission signal, and compares the received transmission signal with the reference frequency according to the interval, and recognizes the transmission signal.

Description

전력선 통신방법{Method of power line communication}Power line communication method

본 발명은 통신방법에 관한 것으로서, 특히 전력선 통신방법에 관한 것이다.The present invention relates to a communication method, and more particularly to a power line communication method.

현재 각 가정 또는 원격에서 가정에 있는 가전기기들을 자동으로 제어하기 위한 홈 네트워크 시스템이 상용화단계에 이르러 있다.Currently, a home network system for automatically controlling home appliances in each home or remote has been commercialized.

이와 같은 홈 네트워크 시스템의 경우, 가전기기 및 이를 제어하기 위한 네트워크 제어기기간의 신호교환을 위한 통신라인 구축이 필수적인 요소인데, 별도의 통신라인을 이용하여 네트워크 망을 구축할 수도 있지만, 현재 모든 가정에 전기를 공급하기 위해 연결된 전력선을 이용하여 네트워크 망을 구축하는 것이 가장 합리적인 방법이고 현재 이 분야의 기술개발이 상당히 이루어진 실정이므로 향후 홈 네트워크 시스템은 전력선을 이용한 통신방식을 채택할 것이다.In the case of such a home network system, it is essential to establish a communication line for signal exchange during the home appliance and a network controller for controlling the same. A network may be constructed using a separate communication line, It is the most reasonable way to build a network using the connected power lines to supply electricity, and since the technology development in this field has been considerably made in the future, the home network system will adopt a communication method using power lines in the future.

또한 이와 같은 전력선 통신방식을 이용한 경우 통신이 이루어지는 가전기기및 네트웍 제어기에는 각각 내부의 디지털 신호를 전력선을 통해 전송 가능한 형태의 신호(Chirp)로 변환하기 위한 전력선 통신모뎀이 필요하다.In addition, in the case of using the power line communication method, a home appliance and a network controller in which communication is required, respectively, require a power line communication modem for converting an internal digital signal into a signal (Chirp) in a form that can be transmitted through the power line.

이와 같은 전력선 통신방식은 가전기기 및 네트워크 제어기 내부의 디지털 신호를 전력선을 통해 전송할 수 있는 형태로 상술한 전력선 통신모뎀에 의해 변환되어야 하는데, 그 변환된 신호를 보면, 도 1과 같은 형태이다.Such a power line communication method should be converted by the above-described power line communication modem in a form capable of transmitting digital signals inside home appliances and network controllers through a power line, and the converted signal is as shown in FIG. 1.

즉, 전력선 통신신호(chirp)는 슈피어리어(Superior)와 인피어리어(Inferior)가 교대로 전송되는데, 가전기기 및 네트워크 제어기 내부의 디지털 신호인 '1'과 '0'를 기설정된 기준값에 맞도록 슈피어리어(Superior)와 인피어리어(Inferior) 각 구간별로 기설정된 시간동안 주파수가 증가하거나 감소하는 선형적인 변화로 이루어지는 신호형태이다.That is, the power line communication signal chirp is alternately transmitted between a superior and an inferior. This is a signal type consisting of a linear change in which the frequency increases or decreases for a predetermined time period in each of the superior and inferior sections.

그리고 수신측에서는 송신측의 신호를 입력받고 상술한 기준값과 비교하여 상관(correlation)되면 해당 값 즉, '1' 또는 '0'으로 인식하는 것이다.When the receiver receives the signal from the transmitter and compares the signal with the above-described reference value, the receiver recognizes the corresponding value as '1' or '0'.

이와 같은 종래의 전력선 통신방식은 통신선로가 전력선이므로 전달 특성이 주파수 대역에 따라 일정하지 않으며 구간별로 선형적인 주파수변화가 발생하므로 위상 지연 및 크기 감쇄 등이 발생하므로 수신측에서 기준값과 비교시 인식하지 못할 정도로 변동이 심할 수 있다.In the conventional power line communication method, since the communication line is a power line, the propagation characteristics are not constant according to the frequency band, and linear frequency changes occur in each section. Therefore, phase delay and magnitude attenuation occur. The fluctuation can be so severe.

종래의 기술에 따른 전력선 통신방법은 구간별로 선형적인 주파수 변화하는 형태로 전송되므로 주파수 대역에 따라 전달 특성이 다르고 위상 지연 및 크기 감쇄 등이 발생하여 수신측에서 정확히 인식하지 못하는 경우가 발생하므로 통신의신뢰성이 저하되는 문제점이 있다.Since the power line communication method according to the related art is transmitted in a form of linear frequency change for each section, transmission characteristics vary according to frequency bands, and phase delays and magnitude attenuations occur, which causes the receiver to not recognize correctly. There is a problem that the reliability is lowered.

따라서 본 발명은 상기한 종래의 문제점을 해결하기 위하여 안출한 것으로서, 통신의 신뢰성을 향상시킬 수 있도록 한 전력선 통신방법을 제공함에 그 목적이 있다.Accordingly, an object of the present invention is to provide a power line communication method capable of improving the reliability of communication, which has been made to solve the above-mentioned conventional problems.

도 1은 종래의 기술에 따른 전력선 통신선로상의 신호형태를 나타낸 파형도1 is a waveform diagram showing the signal form on a power line communication line according to the prior art

도 2는 도 1의 감쇄가 발생한 신호형태를 나타낸 파형도FIG. 2 is a waveform diagram illustrating a signal form in which attenuation of FIG. 1 occurs.

도 3은 본 발명에 따른 전력선 통신선로상의 신호형태를 나타낸 파형도3 is a waveform diagram showing a signal form on a power line communication line according to the present invention;

본 발명은 송신측에서 원(原) 디지털 신호의 각 비트(bit)에 해당하는 구간에 대해 해당 신호값별 기준주파수를 갖는 신호성분이 반복되도록 전체 신호를 구성하여 전송하고, 수신측에서 송신신호를 수신하고 구간별로 기준주파수와 비교하여 송신신호를 인식함을 특징으로 한다.The present invention configures and transmits the entire signal such that a signal component having a reference frequency for each signal value is repeated in a section corresponding to each bit of the original digital signal at the transmitting side, and transmits the transmitting signal at the receiving side. Receives and compares the transmission signal with the reference frequency for each section.

이하, 첨부된 도면을 참조하여 본 발명에 따른 전력선 통신방법의 바람직한 일실시예를 상세히 설명하면 다음과 같다.Hereinafter, a preferred embodiment of a power line communication method according to the present invention with reference to the accompanying drawings in detail as follows.

도 3은 본 발명에 따른 전력선 통신선로상의 신호형태를 나타낸 파형도이다.3 is a waveform diagram showing a signal form on a power line communication line according to the present invention.

본 발명에 따른 전력선 통신선로상의 신호(chirp)는 각 구간(T1,T2,T3)별로 종래의 기술에서처럼 한 구간내에 주파수가 증가하거나 감소하지 않고 소정 세부구간동안 동일한 주파수를 갖는 신호 성분이 소정 개수만큼 반복되는 형태로 전송한다.The signal chirp on the power line communication line according to the present invention has a predetermined number of signal components having the same frequency for a predetermined subdivision without increasing or decreasing the frequency in one section for each section T1, T2, and T3. Transmit as repeated.

다시 말해, 본 발명의 신호형태중 한 예를 나타낸 도 3과 같이, T1 구간에는 'A'라는 주파수를 갖는 신호성분이 3개 반복되고, T2 구간에는 'B'라는 주파수를 갖는 신호성분이 3개 반복되며, T3 구간에는 'C'라는 주파수를 갖는 신호성분이 2개 반복되는 것이다.In other words, as shown in FIG. 3 showing an example of the signal form of the present invention, three signal components having a frequency of 'A' are repeated in the T1 section, and a signal component having a frequency of 'B' is 3 in the T2 section. Are repeated, and two signal components having a frequency of 'C' are repeated in the T3 section.

이때 T1, T2 및 T3 구간의 길이는 수신측에서 주파수 기준값과 비교 가능하도록 고정되어야 하지만, 주파수 및 반복되는 신호성분의 개수는 변동 가능하다.At this time, the lengths of the sections T1, T2, and T3 should be fixed so as to be comparable with the frequency reference value at the receiving side, but the frequency and the number of repeated signal components can be varied.

따라서 수신측에서는 입력된 신호를 기설정된 구간별로 주파수 기준값에 따라 '1' 또는 '0'으로 판단하는 것이다.Therefore, the receiving side determines the input signal as '1' or '0' according to the frequency reference value for each preset section.

이와 같이, 신호를 전송할 경우 전력선이라는 통신선로 특성상 신호의 위상 및 크기는 변동할 수 있지만, 종래 기술처럼 기준신호와 위상 및 크기로 비교하지 않고, 구간별 주파수로 판단하므로 위상 지연 및 크기 감쇄에 따른 영향이 수신측에서 신호인식에 오류를 발생시킬 수 있을 정도로 크지 않다.As such, when the signal is transmitted, the phase and magnitude of the signal may vary due to the characteristics of a communication line called a power line, but as compared to the reference signal and phase and magnitude as in the prior art, the signal is judged as a frequency for each section. The influence is not large enough to cause an error in signal recognition at the receiving end.

본 발명에 따른 전력선 통신방법은 구간별 동일한 주파수를 갖도록 신호를 전송하고 신호 수신측에서 주파수를 기준으로 통신신호를 판단하여 신호의 위상 지연 및 크기 감쇄에 상관없이 정확한 신호인식이 가능하므로 통신의 신뢰성을 극대화할 수 있다.The power line communication method according to the present invention transmits a signal to have the same frequency for each section, and determines the communication signal based on the frequency at the signal receiving side, so that accurate signal recognition is possible regardless of the phase delay and magnitude attenuation of the communication. Can be maximized.

Claims (3)

송신측에서 원(原) 디지털 신호의 각 비트(bit)에 해당하는 구간에 대해 해당 신호값별 기준주파수를 갖는 신호성분이 반복되도록 전체 신호를 구성하여 전송하고, 수신측에서 상기 송신신호를 수신하고 상기 구간별로 기준주파수와 비교하여 송신신호를 인식하는 것을 특징으로 하는 전력선 통신방법.The transmitter configures and transmits the entire signal such that a signal component having a reference frequency for each signal value is repeated in a section corresponding to each bit of the original digital signal, and the receiver receives the transmission signal. The power line communication method, characterized in that for recognizing the transmission signal compared to the reference frequency for each section. 제1 항에 있어서,According to claim 1, 상기 구간의 길이는 송신측과 수신측의 통신약정에 의해 결정됨을 특징으로 하는 전력선 통신방법.And the length of the section is determined by a communication agreement between a transmitting side and a receiving side. 제1 항에 있어서,According to claim 1, 상기 신호성분의 반복횟수는 해당 구간의 길이와 주파수에 의해 결정됨을 특징으로 하는 전력선 통신방법.And a repetition frequency of the signal component is determined by a length and a frequency of a corresponding section.
KR1020020017808A 2002-04-01 2002-04-01 Method of power line communication KR20030079048A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4785195A (en) * 1987-06-01 1988-11-15 University Of Tennessee Research Corporation Power line communication
KR960020193A (en) * 1994-11-17 1996-06-17 이동우 Power Line Communication Method by High Frequency Carriage of Pseudo Random Code
KR19990035982U (en) * 1998-02-11 1999-09-15 강호덕 Data transmission and reception device for power line communication
JPH11284552A (en) * 1998-03-27 1999-10-15 Mitsubishi Electric Corp Power line carrier communication system
KR20010077713A (en) * 2000-02-08 2001-08-20 구자홍 Method and Apparatus for Power line control using radio frequency
US6329905B1 (en) * 2000-03-23 2001-12-11 Thalia Products, Inc. Power line communication system and method
KR100396666B1 (en) * 2001-04-20 2003-09-02 엘지전자 주식회사 Transmitting/Receiving Apparatus and Searching Method of Carrier Frequency with Power-line Communication

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4785195A (en) * 1987-06-01 1988-11-15 University Of Tennessee Research Corporation Power line communication
KR960020193A (en) * 1994-11-17 1996-06-17 이동우 Power Line Communication Method by High Frequency Carriage of Pseudo Random Code
KR19990035982U (en) * 1998-02-11 1999-09-15 강호덕 Data transmission and reception device for power line communication
JPH11284552A (en) * 1998-03-27 1999-10-15 Mitsubishi Electric Corp Power line carrier communication system
KR20010077713A (en) * 2000-02-08 2001-08-20 구자홍 Method and Apparatus for Power line control using radio frequency
US6329905B1 (en) * 2000-03-23 2001-12-11 Thalia Products, Inc. Power line communication system and method
KR100396666B1 (en) * 2001-04-20 2003-09-02 엘지전자 주식회사 Transmitting/Receiving Apparatus and Searching Method of Carrier Frequency with Power-line Communication

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