JP2007174461A - Jamming signal generating apparatus - Google Patents

Jamming signal generating apparatus Download PDF

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JP2007174461A
JP2007174461A JP2005371468A JP2005371468A JP2007174461A JP 2007174461 A JP2007174461 A JP 2007174461A JP 2005371468 A JP2005371468 A JP 2005371468A JP 2005371468 A JP2005371468 A JP 2005371468A JP 2007174461 A JP2007174461 A JP 2007174461A
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power line
modem
line communication
noise
signal
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Haruhisa Sakata
治久 坂田
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KDDI Corp
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KDDI Corp
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<P>PROBLEM TO BE SOLVED: To jam communication of an unidentified PLC modem. <P>SOLUTION: A receiver 40 receives and demodulates a power line communication signal on a power line 12, and supplies a result of demodulation to an unidentified modem detector 42. Identification information used for specifying authenticated PLC modems 32, 34 is stored in an identified modem information storage device 44. The detector 42 extracts the identification information of a PLC modem to be an transmission source from the received signal of the receiver 40, and collates the information with storage identification information of the storage device 44. In the case of a communication signal from the unidentified PLC modem 36 or 38, the detector 42 supplies an unidentified modem detecting signal to a control apparatus 46. The control apparatus 46 causes a noise generating apparatus 50 to generate a noise as a jamming signal for a predetermined period in response to the unidentified modem detecting signal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、電力線通信（ＰＬＣ）に対する妨害信号発生装置に関する。   The present invention relates to an interference signal generator for power line communication (PLC).

ＰＬＣネットワークでは、通信信号は、電力線上を減衰しつつ２方向に伝搬し、伝搬方向の規制が難しい。   In the PLC network, the communication signal propagates in two directions while being attenuated on the power line, and it is difficult to regulate the propagation direction.

電力線通信（ＰＬＣ）モデムを電力線に接続することで、通信可能になるので、部外者にＰＬＣモデムを接続されていても、気付かないことが多い。宅内の機密情報を電力線通信で外部に送信されてしまう可能性がある。   Since communication is possible by connecting a power line communication (PLC) modem to the power line, even if a PLC modem is connected to an outsider, it is often not noticed. There is a possibility that confidential information in the house will be transmitted to the outside by power line communication.

また、ＰＬＣ−ＬＡＮが宅内に構築されている場合にも、通信データを盗聴され、外部に送信されてしまう恐れがある。これを防ぐため、ＰＬＣ−ＬＡＮ内のＰＬＣモデムには一定の認証プロセスを組み込み、各ＰＬＣモデムは、認証されたＰＬＣモデムとの間でのみ通信するように、管理される。   In addition, even when the PLC-LAN is built in a home, communication data may be intercepted and transmitted to the outside. To prevent this, a certain authentication process is incorporated in the PLC modem in the PLC-LAN, and each PLC modem is managed so as to communicate only with the authenticated PLC modem.

宅内に知らずに接続された電力線通信モデムによるデータ漏洩を防ぐ必要がある。また、ＰＬＣ−ＬＡＮが構築されている場合でも、認証されていないＰＬＣモデムは、情報の漏洩につながるので、その通信信号を妨害する必要がある。   It is necessary to prevent data leakage by a power line communication modem connected without knowing in the house. Further, even when a PLC-LAN is constructed, an unauthenticated PLC modem leads to information leakage, and it is necessary to disturb the communication signal.

本発明は、このような情報漏洩を防ぐ妨害信号発生装置を提示することを目的とする。   An object of this invention is to show the interference signal generator which prevents such information leakage.

本発明に係る妨害信号発生装置は、電力線通信を妨害する妨害信号を発生する装置であって、電力線上の電力線通信信号をモニタするモニタ手段と、雑音を発生して当該電力線に供給する雑音発生手段と、当該モニタ手段の検出結果に応じて、当該雑音発生手段に一定期間、雑音を発生させる制御装置とを具備することを特徴とする。   The interference signal generation device according to the present invention is a device that generates an interference signal that interferes with power line communication, and is a monitor means for monitoring a power line communication signal on the power line, and noise generation that generates noise and supplies it to the power line And a control device for causing the noise generating means to generate noise for a certain period according to the detection result of the monitoring means.

本発明によれば、意図しない電力線通信による情報漏洩を効果的に防ぐことができる。   According to the present invention, information leakage due to unintended power line communication can be effectively prevented.

以下、図面を参照して、本発明の実施例を詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は、本発明の一実施例の概略構成ブロック図を示す。分電盤１０の内側の電力線１２上の電源コンセント１４に本発明の一実施例である妨害信号発生装置３０が接続する。電源コンセント１６，１８には、確認された又は接続を許可されたＰＬＣモデム３２，３４がそれぞれ接続し、電源コンセント２０，２２には、それぞれ、確認されていない又は接続を許可されていないＰＬＣモデム３６，３８が接続する。   FIG. 1 shows a schematic block diagram of an embodiment of the present invention. An interference signal generator 30 according to an embodiment of the present invention is connected to a power outlet 14 on the power line 12 inside the distribution board 10. Confirmed or authorized PLC modems 32 and 34 are connected to the power outlets 16 and 18, respectively, and unidentified or unauthorized PLC modems are connected to the power outlets 20 and 22, respectively. 36 and 38 are connected.

妨害信号発生装置３０は、電力線１２を流れる電力線通信信号をモニタし、未確認のＰＬＣモデム３６又は３８からの電力線通信信号を検出すると、一定期間、妨害信号としての雑音を電力線１２上に送出する。   When the interference signal generator 30 monitors the power line communication signal flowing through the power line 12 and detects the power line communication signal from the unconfirmed PLC modem 36 or 38, the interference signal generation device 30 transmits noise as an interference signal on the power line 12 for a certain period.

本実施例では、未確認のＰＬＣモデム３６又は３８からの電力線通信信号かどうかを、電力線通信信号のソースデバイスの識別子で判別する、   In the present embodiment, whether the power line communication signal is from the unconfirmed PLC modem 36 or 38 is determined by the identifier of the source device of the power line communication signal.

受信装置４０は、電力線１２上の電力線通信信号を受信及び復調し、復調結果を未確認モデム検出装置４２に供給する。電力線通信には複数の通信規格が存在するが、受信装置４０は、それらの複数の通信規格に対応する。   The reception device 40 receives and demodulates the power line communication signal on the power line 12 and supplies the demodulation result to the unconfirmed modem detection device 42. Although there are a plurality of communication standards for power line communication, the receiving device 40 corresponds to the plurality of communication standards.

確認モデム情報記憶装置４４には、電力線１２に接続される認証済みのＰＬＣモデム、図１に示す例は、モデム３２，３４を特定する識別情報が格納されている。未確認モデム検出装置４２は、受信装置４０により受信された通信信号から発信元となるＰＬＣモデムの識別情報を抽出し、確認モデム情報記憶装置４４の記憶識別情報と照合する。発信元のＰＬＣモデムの識別情報が、確認モデム情報記憶装置４４に格納されていなければ、その通信信号は、未確認のＰＬＣモデム３６又は３８から出力されたものであることになる。未確認モデム検出装置４２は、未確認のＰＬＣモデム３６又は３８からの通信信号を検出すると、未確認モデム検出信号を制御装置４６に供給する。受信装置４０、未確認モデム検出装置４２及び確認モデム情報記憶装置４４は、特許請求の範囲に規定されるモニタ手段として機能する。   The confirmation modem information storage device 44 stores an authenticated PLC modem connected to the power line 12, and identification information for identifying the modems 32 and 34 in the example shown in FIG. The unconfirmed modem detection device 42 extracts the identification information of the PLC modem that is the transmission source from the communication signal received by the reception device 40 and collates it with the storage identification information in the confirmation modem information storage device 44. If the identification information of the originating PLC modem is not stored in the confirmation modem information storage device 44, the communication signal is output from the unconfirmed PLC modem 36 or 38. When the unconfirmed modem detection device 42 detects a communication signal from the unconfirmed PLC modem 36 or 38, it supplies an unconfirmed modem detection signal to the control device 46. The receiving device 40, the unconfirmed modem detecting device 42, and the confirmed modem information storage device 44 function as monitoring means defined in the claims.

制御装置４６は未確認モデム検出装置４２からの未確認モデム検出信号に応じて、一定期間、雑音発生装置５０に妨害信号としての雑音を発生させる。雑音発生装置５０の発生する雑音は、電力線１２に印加される。制御装置４６は、雑音発生装置５０に雑音を発生させる間、受信装置４０に受信を停止させる。   In response to the unconfirmed modem detection signal from the unconfirmed modem detection device 42, the control device 46 causes the noise generation device 50 to generate noise as an interference signal for a certain period. Noise generated by the noise generator 50 is applied to the power line 12. The control device 46 causes the reception device 40 to stop reception while the noise generation device 50 generates noise.

雑音発生装置５０の発生する雑音が電力線１２に供給されることにより、未確認のＰＬＣモデム３６，３８の発生するＰＬＣ信号は、雑音に埋もれ、分電盤１０の外にある図示しないＰＬＣモデムは、ＰＬＣモデム３６，３８の発生するＰＬＣ信号を受信できない。本実施例では、このようにして、データの漏洩を防止する。   When the noise generated by the noise generator 50 is supplied to the power line 12, the PLC signals generated by the unconfirmed PLC modems 36 and 38 are buried in the noise, and the PLC modem (not shown) outside the distribution board 10 is The PLC signal generated by the PLC modems 36 and 38 cannot be received. In the present embodiment, data leakage is thus prevented.

雑音発生装置５０の雑音発生が終了すると、制御装置４６は、受信装置４０に受信を再開させる。受信装置４０は、電力線１２上の電力線通信信号を受信及び復調し、復調結果を先に説明したように、未確認モデム検出装置４２に受信通信信号を供給する。   When the noise generation of the noise generation device 50 ends, the control device 46 causes the reception device 40 to resume reception. The receiving device 40 receives and demodulates the power line communication signal on the power line 12, and supplies the received communication signal to the unconfirmed modem detection device 42 as described above for the demodulation result.

図２は、未確認のＰＬＣモデム３６又は３８から出力される通信信号と、雑音発生装置５０の発生する雑音との関係を示す模式図である。横軸は時間を示し、縦軸は、通信信号及び雑音のパワーを示す。図２に示すモニタ区間に、受信装置４０が電力線１２上の電力線通信信号を受信し、未確認モデム検出装置が、受信通信信号が未確認ＰＬＣモデムからのものかどうかを検出する。   FIG. 2 is a schematic diagram showing the relationship between the communication signal output from the unconfirmed PLC modem 36 or 38 and the noise generated by the noise generator 50. The horizontal axis represents time, and the vertical axis represents communication signal and noise power. In the monitor section shown in FIG. 2, the receiving device 40 receives the power line communication signal on the power line 12, and the unconfirmed modem detection device detects whether the received communication signal is from an unconfirmed PLC modem.

未確認のＰＬＣモデム３６又は３８からの電力線通信信号かどうかを判別する方法としては、電力線通信信号のソースデバイスの識別子を使う上述の方法とは別に、電力線通信信号が許可されたタイミングで電力線１２に出力されているかどうかを調べる方法がある。この方法は、ＴＤＭを基本とする電力線通信システムに適用可能であり、データ復調が不要になるという利点がある。   As a method for determining whether or not the power line communication signal is from the unconfirmed PLC modem 36 or 38, in addition to the above-described method using the identifier of the source device of the power line communication signal, the power line communication signal is sent to the power line 12 at a timing when the power line communication signal is permitted. There is a method to check whether it is output. This method is applicable to a power line communication system based on TDM, and has an advantage that data demodulation is unnecessary.

電力線１２上に確認済みのＰＬＣモデム３２，３４が接続されていない場合、即ち、電力線通信が正規に利用されていない場合にも、本実施例は、電力線通信による情報漏洩を防ぐ目的で利用可能である。このような目的では、受信装置４０及び未確認モデム検出装置４２は、電力線通信信号が電力線１２上に存在するか否かを調べれば良い。   Even when the confirmed PLC modems 32 and 34 are not connected to the power line 12, that is, when the power line communication is not properly used, this embodiment can be used for the purpose of preventing information leakage due to the power line communication. It is. For such a purpose, the receiving device 40 and the unconfirmed modem detecting device 42 may check whether or not a power line communication signal exists on the power line 12.

図３は、本発明の第２実施例の概略構成ブロック図を示す。   FIG. 3 shows a schematic block diagram of the second embodiment of the present invention.

電源コンセント１４に本発明の第２実施例である妨害信号発生装置６０が接続する。妨害信号発生装置６０は、電力線１２を流れる交流信号の、電力線通信に使用される周波数帯域のスペクトルを計測し、許可されていないスペクトル成分を検出すると、一定期間、妨害信号を電力線１２上に送出する。   An interference signal generator 60 according to the second embodiment of the present invention is connected to the power outlet 14. The interference signal generation device 60 measures the spectrum of the frequency band used for power line communication of the AC signal flowing through the power line 12, and sends a disturbance signal onto the power line 12 for a certain period of time when an unauthorized spectrum component is detected. To do.

スペクトル計測装置６２は、電力線１２上を流れる交流信号の内で、電力線通信に使用される周波数帯域のスペクトルを計測し、計測結果を制御装置６６に供給する。スペクトル計測結果は、電力線通信に使用される周波数帯域を複数のバンドに区分けした場合の、バンド毎のパワーであればよい。スペクトル計測装置６２は、特許請求の範囲に規定されるモニタ手段として機能する。   The spectrum measuring device 62 measures the spectrum of the frequency band used for power line communication among the AC signals flowing on the power line 12 and supplies the measurement result to the control device 66. The spectrum measurement result may be the power for each band when the frequency band used for power line communication is divided into a plurality of bands. The spectrum measuring device 62 functions as monitoring means defined in the claims.

利用バンド情報記憶装置６４は、電力線１２に接続される確認済みのＰＬＣモデム３２，３４間の電力線通信に使用される周波数帯域又はバンドを示す情報が記憶されている。   The use band information storage device 64 stores information indicating a frequency band or a band used for power line communication between the confirmed PLC modems 32 and 34 connected to the power line 12.

制御装置６６は、利用バンド情報記憶装置６４を参照し、スペクトル計測装置６２の計測結果から、電力線１２上に未確認のＰＬＣモデム３６又は同３８による電力線通信信号が流れているかどうかを判定する。利用バンド情報記憶装置６４に記憶されているバンド以外のバンドで有意な電力が一定期間以上にわたり検出されれば、未確認のＰＬＣモデム３６又は同３８が電力線１２を使って通信をしていることになる。瞬時的なノイズによる誤検出を防げる程度の期間、スペクトルをモニタする。   The control device 66 refers to the use band information storage device 64 and determines from the measurement result of the spectrum measurement device 62 whether the power line communication signal by the unconfirmed PLC modem 36 or 38 is flowing on the power line 12. If significant power is detected in a band other than the band stored in the used band information storage device 64 over a certain period, the unconfirmed PLC modem 36 or 38 is communicating using the power line 12. Become. The spectrum is monitored for a period that can prevent false detection due to instantaneous noise.

制御装置６６は、不使用バンドで有意な電力を検出すると、一定期間、雑音発生装置７０に妨害信号としての雑音を発生させる。雑音発生装置７０の発生する雑音は、電力線１２に印加される。制御装置６６は、雑音発生装置７０に雑音を発生させる間、スペクトル計測装置６２に計測を停止させる。   When the control device 66 detects significant power in the unused band, the control device 66 causes the noise generation device 70 to generate noise as an interference signal for a certain period. Noise generated by the noise generator 70 is applied to the power line 12. The control device 66 causes the spectrum measurement device 62 to stop measurement while the noise generation device 70 generates noise.

雑音発生装置７０の発生する雑音が電力線１２に供給されることにより、未確認のＰＬＣモデム３６，３８の発生するＰＬＣ信号は、雑音に埋もれ、分電盤１０の外にある図示しないＰＬＣモデムは、ＰＬＣモデム３６，３８の発生するＰＬＣ信号を受信できない。本実施例では、このようにして、データの漏洩を防止する。   When the noise generated by the noise generator 70 is supplied to the power line 12, the PLC signals generated by the unconfirmed PLC modems 36 and 38 are buried in the noise, and the PLC modem (not shown) outside the distribution board 10 is The PLC signal generated by the PLC modems 36 and 38 cannot be received. In the present embodiment, data leakage is thus prevented.

雑音発生装置７０の雑音発生が終了すると、制御装置６６は、スペクトル計測装置６２にスペクトル計測を再開させる。スペクトル計測装置６２は、先に説明したように、電力線１２上の交流信号のスペクトルを計測し、計測結果を制御装置６６に供給する。   When the noise generation of the noise generation device 70 is completed, the control device 66 causes the spectrum measurement device 62 to resume spectrum measurement. As described above, the spectrum measuring device 62 measures the spectrum of the AC signal on the power line 12 and supplies the measurement result to the control device 66.

制御装置６６は、利用バンド情報記憶装置６４を参照し、ＰＬＣモデム３２，３４間の電力線通信で使用されない１又は複数のバンドをスペクトル計測装置６２に予めセットし、スペクトル計測装置６２は、そのようにセットされた１又は複数のバンドでスペクトルを計測し、その計測結果を制御装置６６に出力するようにしてもよい。   The control device 66 refers to the use band information storage device 64 and presets one or a plurality of bands that are not used in power line communication between the PLC modems 32 and 34 in the spectrum measurement device 62. The spectrum may be measured with one or a plurality of bands set to, and the measurement result may be output to the control device 66.

また、制御装置６６は、未確認のＰＬＣモデム３６，３８が使用するバンドに重なる雑音を雑音発生装置７０に発生させても良い。ＰＬＣモデム３６，３８の通信を効果的に妨害できる。   The control device 66 may cause the noise generation device 70 to generate noise that overlaps the band used by the unconfirmed PLC modems 36 and 38. Communication of the PLC modems 36 and 38 can be effectively interrupted.

電力線１２上に確認済みのＰＬＣモデム３２，３４が接続されていない場合、即ち、電力線通信が正規に利用されていない場合にも、本実施例は、電力線通信による情報漏洩を防ぐ目的で利用可能である。このような目的では、スペクトル計測装置６２は、電力線通信信号に使用されるバンドで有意な電力が電力線１２上に存在するか否かを調べれば良い。   Even when the confirmed PLC modems 32 and 34 are not connected to the power line 12, that is, when the power line communication is not properly used, this embodiment can be used for the purpose of preventing information leakage due to the power line communication. It is. For such a purpose, the spectrum measuring device 62 may check whether or not significant power exists on the power line 12 in the band used for the power line communication signal.

未確認のＰＬＣモデム３６又は３８からの電力線通信信号かどうかを判別する方法としては、上述した方法の他に、電力線通信信号が許可されたタイミングで電力線１２に出力されているかどうかを調べる方法がある。この方法は、ＴＤＭを利用する電力線通信システムに適用可能である。実施例１にこの方法を適用とすると、受信装置４０又はスペクトル計測装置６２が、許可されていないタイミングで電力線通信信号を示す電力が存在するか否かを調べれば良い。   As a method for determining whether or not the power line communication signal is from the unconfirmed PLC modem 36 or 38, there is a method for checking whether or not the power line communication signal is output to the power line 12 at the permitted timing. . This method is applicable to a power line communication system using TDM. When this method is applied to the first embodiment, the receiving device 40 or the spectrum measuring device 62 may check whether or not there is power indicating a power line communication signal at a timing not permitted.

特定の説明用の実施例を参照して本発明を説明したが、特許請求の範囲に規定される本発明の技術的範囲を逸脱しないで、上述の実施例に種々の変更・修整を施しうることは、本発明の属する分野の技術者にとって自明であり、このような変更・修整も本発明の技術的範囲に含まれる。   Although the invention has been described with reference to specific illustrative embodiments, various modifications and alterations may be made to the above-described embodiments without departing from the scope of the invention as defined in the claims. This is obvious to an engineer in the field to which the present invention belongs, and such changes and modifications are also included in the technical scope of the present invention.

本発明の第１実施例の概略構成ブロック図である。It is a schematic block diagram of the first embodiment of the present invention. 不審な電力線通信信号と妨害信号との関係を示す模式図である。It is a schematic diagram which shows the relationship between a suspicious power line communication signal and a disturbance signal. 本発明の第２実施例の概略構成ブロック図である。It is a schematic block diagram of the second embodiment of the present invention.

符号の説明Explanation of symbols

１０：分電盤
１２：電力線
１４，１６，１８，２０，２２：電源コンセント
３０：妨害信号発生装置
３２，３４：確認されたＰＬＣモデム３２，３４
３６，３８：未確認のＰＬＣモデム
４０：受信装置
４２：未確認モデム検出装置
４４：確認モデム情報記憶装置
４６：制御装置
４８：タイマ
５０：雑音発生装置
６０：妨害信号発生装置
６２：スペクトル計測装置
６４：利用バンド情報記憶装置
６６：制御装置
６８：タイマ
７０：雑音発生装置 10: Distribution board 12: Power lines 14, 16, 18, 20, 22: Power outlet 30: Interference signal generators 32, 34: Confirmed PLC modems 32, 34
36, 38: Unconfirmed PLC modem 40: Receiver 42: Unconfirmed modem detector 44: Confirmed modem information storage device 46: Controller 48: Timer 50: Noise generator 60: Interference signal generator 62: Spectrum measuring device 64: Use band information storage device 66: control device 68: timer 70: noise generator

Claims (5)

電力線通信を妨害する妨害信号を発生する装置であって、
電力線上の電力線通信信号をモニタするモニタ手段（４０，４２，４４；６２）と、
雑音を発生して当該電力線に供給する雑音発生手段（５０，７０）と、
当該モニタ手段の検出結果に応じて、当該雑音発生手段に一定期間、雑音を発生させる制御装置（４６，４８，６６，６８）
とを具備することを特徴とする妨害信号発生装置。 A device that generates an interfering signal that interferes with power line communication,
Monitoring means (40, 42, 44; 62) for monitoring power line communication signals on the power line;
Noise generating means (50, 70) for generating and supplying noise to the power line;
A control device (46, 48, 66, 68) for causing the noise generating means to generate noise for a certain period of time according to the detection result of the monitoring means.
An interference signal generating device comprising: 当該モニタ手段が、
当該電力線の電力線通信信号を受信及び復調する受信手段（４０）と、
当該受信手段で受信した通信信号が未確認の電力線通信モデムからのものかどうかを検出する未確認モデム検出手段（４２，４４）
とを具備することを特徴とする請求項１に記載の妨害信号発生装置。 The monitoring means is
Receiving means (40) for receiving and demodulating a power line communication signal of the power line;
Unconfirmed modem detection means (42, 44) for detecting whether the communication signal received by the receiving means is from an unconfirmed power line communication modem
The interference signal generating device according to claim 1, further comprising: 当該モニタ手段が、当該電力線の電力線通信に使用される所定スペクトル領域の電力を計測するスペクトル計測装置（６２）を具備することを特徴とする請求項１に記載の妨害信号発生装置。   The interference signal generation device according to claim 1, wherein the monitor means includes a spectrum measurement device (62) for measuring power in a predetermined spectrum region used for power line communication of the power line. 更に、正規の電力線通信に使用されるバンド情報を記憶する利用バンド情報記憶装置（６４）を具備することを特徴とする請求項３に記載の妨害信号発生装置。   The interference signal generating device according to claim 3, further comprising a use band information storage device (64) for storing band information used for regular power line communication. 当該モニタ手段が、正規の電力線通信に使用されないタイムスロットにおける電力線通信信号をモニタする手段であることを特徴とする請求項１に記載の妨害信号発生装置。   2. The interference signal generator according to claim 1, wherein the monitoring means is means for monitoring a power line communication signal in a time slot not used for regular power line communication.
JP2005371468A 2005-12-26 2005-12-26 Jamming signal generating apparatus Pending JP2007174461A (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2020136636A1 (en) * 2018-12-24 2020-07-02 S.G.A. Innovations Ltd. Systems, devices and methods for detection and/or prevention of power line communication

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JP2002111555A (en) * 2000-09-29 2002-04-12 Matsushita Electric Ind Co Ltd Communication system and electrical apparatus
JP2004349787A (en) * 2003-05-20 2004-12-09 Nippon Telegr & Teleph Corp <Ntt> System and apparatus for multi-carrier transmission
JP2005151408A (en) * 2003-11-19 2005-06-09 Matsushita Electric Ind Co Ltd Power-line carrier communication system and feed connector
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Publication number Priority date Publication date Assignee Title
JPH0250531A (en) * 1988-08-11 1990-02-20 Matsushita Electric Ind Co Ltd Power line carrier home control system
JP2002111555A (en) * 2000-09-29 2002-04-12 Matsushita Electric Ind Co Ltd Communication system and electrical apparatus
JP2004349787A (en) * 2003-05-20 2004-12-09 Nippon Telegr & Teleph Corp <Ntt> System and apparatus for multi-carrier transmission
JP2005151408A (en) * 2003-11-19 2005-06-09 Matsushita Electric Ind Co Ltd Power-line carrier communication system and feed connector
JP2006180384A (en) * 2004-12-24 2006-07-06 Toshiba Corp Communication unit and its communication method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020136636A1 (en) * 2018-12-24 2020-07-02 S.G.A. Innovations Ltd. Systems, devices and methods for detection and/or prevention of power line communication

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