KR200342064Y1 - Power line communication repeater of full duplex type over medium voltage power line - Google Patents

Abstract

The present disclosure relates to a power line communication repeater for a high-voltage distribution line using a full-duplex transmission method, wherein a signal transmitted through a high-voltage distribution line using different frequency bands is not simply amplified, but instead of an original signal according to a full-duplex transmission system. Faithfully reproduce the signal, amplify the restored original signal and send it to the next repeater through the high-voltage distribution line.

Therefore, the present invention can perform a high quality signal transmission without attenuation and distortion of the signal power to each of the long-distance customers, thereby providing the effect of conveniently using the power line communication service without the construction of a new infrastructure.

Description

Power line communication repeater of full duplex type over medium voltage power line}

The present invention relates to a repeater.

More specifically, when using power line communication through a high-voltage distribution line using different frequency bands, a full-duplex transmission method is used that enables signal transmission to be carried out without attenuation and distortion of signal power to each of the remote users according to the full-duplex transmission method. It relates to a power line communication repeater for a high-voltage distribution line used.

In recent years, the spread of high-speed and broadband Internet services has been rapidly increasing. Currently, xDSL (Digital Subscriber Line), cable network, etc. are used as wired Internet access networks. Although such a method is used, the service is mainly focused on metropolitan areas due to the burden of new network construction costs.

Therefore, power line communication is emerging as an economical construction plan for high-speed Internet access network. Especially, in the areas where coaxial cable or optical cable is not easy to install, such as rural areas and rural areas, the existing perfect power line infrastructure is used. Therefore, the construction of broadband access network is expected to be a very effective and optimal access network solution.

However, in these areas, since high-speed data must be transmitted through a 22.9kV high voltage line that is more than 10 km, signal power attenuation and distortion are very serious. Accordingly, the need for a signal repeater (repeater) for the high-quality signal transmission to the consumer has emerged greatly.

The above-mentioned signal repeater for power line communication is a device which maintains the signal-to-noise ratio by installing at a position where the signal-to-noise ratio falls below a specified value. It is a device that regenerates and amplifies only specific data defined in a desired data format and retransmits in such a way that interference with a received signal does not occur.

The repeater can selectively respond by applying and assigning different addressing techniques to the same repeater for the front equipment and the rear equipment, and coping with the change of signal flow direction according to the reconfiguration of the line due to the system opening / closing operation. .

In addition, the message is reconstructed by the indicated method according to the power line communication design parameter, and the signal is transmitted by faithfully reproducing the original signal instead of simply transmitting the received signal as an amplified form.

In addition, due to the rapidly increasing need for various communication services, bidirectional communication with power line communication interactive terminals should be possible, and repeaters should be designed to accommodate such functions.

However, the conventional power line communication repeater is not designed to accommodate the various functions as described above.

The purpose of the present invention is to solve the above-mentioned problems, when using power line communication through a high-voltage distribution line using different frequency bands, high-quality signals without attenuation and distortion of signal power up to each customer in the far distance according to the full-duplex transmission method. The present invention provides a power line communication repeater for a high-voltage distribution line using a full-duplex transmission method that enables transmission.

1 is a view for explaining a power line communication repeater for a high-voltage distribution line using a full-duplex transmission method according to the present invention,

FIG. 2 is a diagram for describing a modified repeater of FIG. 1.

Explanation of symbols on the main parts of the drawings

110: blocking filter

120: first high pressure coupling part

125: second high pressure coupling unit

130: first bidirectional amplifier

135: second bidirectional amplifier

140: first bandpass filter

145: second band pass filter

150: forward OFDM modem

160: reverse OFDM modem

Power line communication repeater for a high-voltage distribution line using a full-duplex transmission method according to the present invention for achieving this purpose, passes the broadband communication signal in the signal transmitted through the high-voltage distribution line in the forward signal transmission, restored during the reverse signal transmission A first high pressure coupling portion for coupling an original signal with an alternating current component passing through a blocking filter; A second high pressure coupling unit for coupling the original signal restored during forward signal transmission with an alternating current component passing through a blocking filter and passing a broadband communication signal in a signal transmitted through a high voltage distribution line during reverse signal transmission; A first bidirectional amplifier for amplifying a low voltage communication signal received through the first high voltage coupling unit during forward signal transmission and amplifying the original signal restored during the reverse signal transmission to the first high voltage coupling unit; A second bidirectional amplifier for amplifying the restored original signal during forward signal transmission to the first high voltage coupling unit, and for amplifying a low voltage communication signal received through the second high voltage coupling unit during reverse signal transmission; A first bandpass filter for filtering only a transmission / reception band corresponding to a communication frequency band in a signal amplified by the first bidirectional amplifier during forward signal transmission; A second bandpass filter for filtering only a transmission / reception band corresponding to a communication frequency band in the signal amplified by the second bidirectional amplifier during the reverse signal transmission; A forward OFDM modem for restoring the attenuated and distorted signal of the communication signal filtered by the first band pass filter to the original signal during forward signal transmission to a next repeater through a high-voltage distribution line; And a reverse OFDM modem configured to restore the attenuated and distorted signal of the communication signal filtered by the second band pass filter to the original signal during the reverse signal transmission to the next repeater through a high-voltage distribution line. .

In addition, instead of the two-way communication in the different transmission and reception frequency bands for the communication signal transmitted through the above-described high-voltage distribution line, by separating the two different frequency bands into the transmission and reception frequency bands, respectively, Is reduced, but the interference is reduced, thereby reducing the probability of symbol error. In the case of the bidirectional communication method, a blocking filter is not used. In this case, the additional use of the blocking filter can increase the repeater interference and noise canceling performance.

Hereinafter, a power line communication repeater for a high-voltage distribution line using a full-duplex transmission method of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for explaining a power line communication repeater for a high-voltage distribution line using a full-duplex transmission method according to the present invention, Figure 2 is a view for explaining the modified repeater of FIG.

As shown, the first high-voltage coupling unit 120 passes the broadband communication signal from the signal transmitted through the high-voltage distribution line during the forward signal transmission to the first bidirectional amplifier 130, and transmits the first signal when the reverse signal transmission The restored original signal amplified and input from the bidirectional amplifier 130 is combined with an alternating current (60 Hz AC) component passing through the blocking filter 100 to be transmitted to the next relay through a high-voltage distribution line.

The first bidirectional amplifier 130 amplifies a low voltage communication signal input through the first high-pressure coupling unit 120 and transmits the signal to the first band pass filter 140 when the forward signal is transmitted. The original signal restored through the reverse OFDM modem 160 is amplified and output to the first high voltage coupling unit 120.

The first band pass filter 140 filters only a transmission / reception band corresponding to a communication frequency band from the signal amplified by the first bidirectional amplifier 130 and transmits the signal to the forward OFDM modem 150 during the forward signal transmission.

The forward OFDM modem (Orthogonal Frequency Division Multiplexing) 150 restores the attenuated and distorted signal of the communication signal, which is filtered from the first bandpass filter 140 and transmitted to the original signal during the forward signal transmission, The restored original signal is output to the second bidirectional amplifier 135.

The second bidirectional amplifier 135 amplifies the original signal restored by the forward OFDM modem 150 in the forward signal transmission to the second high-voltage coupling unit 125, and transmits the second high-voltage coupling unit 125 in the reverse signal transmission The amplified low voltage communication signal is output through the second band pass filter 145.

The second high pressure coupling unit 125 combines the restored original signal amplified from the second bidirectional amplifier 135 and the AC component passed through the blocking filter 100 to the next relay through the high voltage distribution line during forward signal transmission. In the reverse signal transmission, the broadband communication signal is passed through the high voltage distribution line and output to the second bidirectional amplifier 135.

The second band pass filter 145 filters only a transmission / reception band corresponding to a communication frequency band from the signal amplified by the second bidirectional amplifier 135 and transmits the reverse band signal to the reverse OFDM modem 160 when the reverse signal is transmitted.

The reverse OFDM modem 160 restores the attenuated and distorted signal of the communication signal filtered and input from the second band pass filter 145 to the original signal during the reverse signal transmission, and restores the restored original signal to the first bidirectional amplifier 130. )

On the other hand, as shown in Figure 2, instead of the two-way communication in the different transmission and reception frequency bands for the communication signal transmitted through the high-voltage distribution line (the method of Figure 1), two different frequency bands Separated into transmission and reception frequency bands respectively, it is not necessary to use the blocking filter 110 in the case of using a bidirectional communication method in which the data rate is reduced but the interference is reduced, thereby reducing the probability of symbol error. In this case, the blocking filter 110 Additional use of) may further improve repeater interference and noise rejection performance.

Next, the operation of the power line communication repeater for a high-voltage distribution line using the full-duplex transmission method according to the present invention configured as described above will be described in more detail.

First, as shown in FIG. 1, when forward signals are transmitted, a communication signal transmitted through a high voltage distribution line passes through the first high voltage coupling unit 120 to obtain only a broadband communication signal, and the broadband signal has a low voltage. In order to amplify this, it passes through the first bidirectional amplifier 130.

The first band pass filter 140 filters only a transmission / reception band corresponding to a communication frequency band, and the filtered communication signal is applied to the forward OFDM modem 150.

The attenuated and distorted signal is restored to the original signal through the forward OFDM modem 150, and the restored signal is amplified into a signal of a predetermined size through the second bidirectional amplifier 135 and then through the second high voltage coupling unit 125. The blocking filter 110 is combined with the 60Hz AC component passed through the high-voltage distribution line to the next repeater.

In addition, in the reverse signal transmission as described above, in the reverse signal transmission, the communication signal transmitted through the high voltage distribution line passes through the second high voltage coupling unit 125 to obtain only the broadband communication signal, and the broadband signal has a low voltage. Since it passes through the second bi-directional amplifier 135 to amplify it.

The second band pass filter 145 filters only a transmission / reception band corresponding to the communication frequency band, and the filtered communication signal is applied to the reverse OFDM modem 160.

The attenuated and distorted signal is restored to the original signal through the reverse OFDM modem 160, and the restored signal is amplified into a signal of a predetermined size through the first bidirectional amplifier 130 and then through the first high voltage coupling unit 120. The blocking filter 110 is combined with the 60Hz AC component passed through the high-voltage distribution line to the next repeater.

Meanwhile, a modified repeater for full-duplex transmission using different frequency bands shown in FIG. 2 will be described. In the forward or reverse signal transmission, the forward OFDM modem 150 or the reverse OFDM modem 160 may use different transmission and reception methods. Instead of the two-way communication in the receiving frequency band, by dividing the two frequency bands into the transmit and receive frequency bands, respectively, the data transmission rate is reduced, but interference is reduced because the probability of generating a symbol error can be lowered. In addition, there is an advantage that the blocking filter 110 does not need to be used because different bands are used between both ends of the repeater, and in the case of using the blocking filter 110, the repeater interference and noise canceling performance may be further improved.

As described above, according to the power line communication repeater for a high-voltage distribution line using the full-duplex transmission method of the present invention, the signal transmitted on the high-voltage distribution line using different frequency bands is not simply amplified and is transmitted to the full-duplex transmission system. Therefore, by faithfully reproducing the original signal and transmitting the signal, it is possible to perform high quality signal transmission without attenuating and distorting the signal power to each of the remote customers, thereby conveniently utilizing the power line communication service without constructing a new infrastructure. It can be effective.

Herein, while the present invention has been described with reference to a preferred embodiment, those skilled in the art will be able to vary the present invention without departing from the spirit and scope of the present invention described in the utility model registration claims below. It will be understood that modifications and changes can be made.

Claims (2)

A first high pressure coupling unit configured to pass a broadband communication signal in a signal transmitted through a high voltage distribution line during forward signal transmission, and to combine an original signal restored during reverse signal transmission with an AC component passing through a blocking filter; A second high voltage coupling unit for coupling the original signal restored during forward signal transmission with an AC component passing through a blocking filter, and passing a broadband communication signal in a signal transmitted through a high voltage distribution line during reverse signal transmission; A first bidirectional amplifier for amplifying a low voltage communication signal received through the first high voltage coupling unit during forward signal transmission and amplifying the restored original signal during the reverse signal transmission to the first high voltage coupling unit; A second bidirectional amplifier for amplifying a restored original signal during forward signal transmission to the second high voltage coupling unit and amplifying a low voltage communication signal received through the second high voltage coupling unit during reverse signal transmission; A first bandpass filter for filtering only a transmission / reception band according to a communication frequency band in a signal amplified by the first bidirectional amplifier during forward signal transmission; A second bandpass filter for filtering only a transmission / reception band according to a communication frequency band in a signal amplified by the second bidirectional amplifier during a reverse signal transmission; A forward OFDM modem for restoring the attenuated and distorted signal of the communication signal filtered by the first band pass filter to the original signal during forward signal transmission to a next repeater through a high-voltage distribution line; And And a reverse OFDM modem for restoring the attenuated and distorted signal of the communication signal filtered by the second band pass filter to the original signal during the reverse signal transmission to the next repeater through a high-voltage distribution line. Power line communication repeater for high-voltage distribution line using a full-duplex transmission system. The method of claim 1, Instead of the two-way communication in the different transmission and reception frequency bands for the communication signal transmitted through the high-voltage distribution line, two different frequency bands are separated into the transmission and reception frequency bands respectively, reducing the data rate but interference In this case, the blocking filter does not need to be used in order to reduce the probability of generating a symbol error. When the blocking filter is additionally used, power line communication repeater for a high-voltage distribution line using a full-duplex transmission method, characterized in that it can increase repeater interference and noise canceling performance.