CN110365369B - Power line carrier communication system supporting long-distance transmission - Google Patents
Power line carrier communication system supporting long-distance transmission Download PDFInfo
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- CN110365369B CN110365369B CN201910797419.7A CN201910797419A CN110365369B CN 110365369 B CN110365369 B CN 110365369B CN 201910797419 A CN201910797419 A CN 201910797419A CN 110365369 B CN110365369 B CN 110365369B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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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
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
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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
- H04B3/58—Repeater circuits
Abstract
A power carrier communication system supporting long-distance transmission comprises a first power carrier communication module, a second power carrier communication module, power carrier filtering equipment and power carrier modulation equipment; the first power carrier communication module and the second power carrier communication module are connected with each other, the power detection module and the power carrier communication signal amplification module are contained inside the first power carrier communication module and the second power carrier communication module, the first power carrier communication module and the second power carrier communication module are connected with power carrier filtering equipment, and each power carrier filtering equipment is connected with power carrier modulation equipment. Optionally, when there are multiple ports, a combiner or a splitter needs to be introduced to connect signals of multiple input ports or output ports. By introducing the power carrier communication signal relay equipment, the invention can finish the relay of the power carrier signal only by using the signal processing circuit of the communication processor due to the fact that an application processing module structure can be removed, and the system design is simpler, the cost is reduced, and the power consumption is lower.
Description
Technical Field
The invention belongs to the technical field of power line carrier communication, and particularly relates to a power line carrier communication system supporting long-distance transmission.
Background
The closest prior art to this technology is the power line carrier communication technology, in which a power line carrier communication signal for transmitting data is modulated onto a high frequency modulation signal of 0-50MHz, and this high frequency modulation signal is superimposed on a low frequency ac power signal of 50Hz of a power line to constitute a power line carrier signal, which is transmitted to other terminals of a power system along with a power cable.
The traditional power line carrier communication technology is mainly applied to the situation that a power modem is used for surfing the internet, an indoor internet terminal modulates signals into power line carrier signals through the power modem, and the power line carrier signals are transmitted to a router in a house through a power line in the house. The transmission distance is very close, generally within 100 meters. However, in a long-distance transmission scenario, for example, in a power monitoring system, when the distance for transmitting the power carrier signal is long, since the transmission loss of the low-frequency ac power signal on the power line is much smaller than that of the high-frequency power carrier communication signal, in many cases, the power carrier communication signal needs to be relayed to realize the long-distance device signal transmission.
However, in order to reuse the existing power carrier communication equipment as much as possible, the existing power carrier relay equipment generally adopts a design mode that two power carrier communication modules are back to back, as shown in fig. 1. One communication module is used for demodulating the power carrier communication signals subjected to transmission attenuation to form original digital information, the application processing module performs data processing (error control, routing relay and the like) according to the application requirements of the relay, the digital information is sent to the second communication module, the digital information is re-modulated to be power carrier communication signals, the power carrier communication signals are superposed on the low-frequency alternating current power signals to form power carrier signals, and the power carrier signals are sent out. This device requires two communication modules and, because of the application processing (such as routing, error control, etc.) required on the demodulated digital signal, an application processing module is required to perform the application layer work, which is usually implemented by an application processor. Since the power line carrier relay device has both a communication module and an application processing module, such an architecture is very high in terms of cost, device complexity, device size, power consumption, and the like. For example, if the chip is used for implementation, an application processor chip (AP) and a communication processor Chip (CP) need to be designed at the same time, and an operating system needs to be run to complete processing of an application layer, so that the complexity of the whole SoC chip is very high, and further, the cost, size, power consumption, and performance of the device are all lost.
In the field of wireless communication, there has long been a wireless relay device such as a wireless relay station (or referred to as a repeater). The repeater has the main function that aiming at the shielded area of the wireless signal, the wireless coverage capability of the shielded area is improved by arranging a device for receiving, amplifying and forwarding the wireless signal. However, since the wireless devices are propagated through the wireless space, the wireless repeater device is very simple to operate by receiving all wireless signals in a given frequency band, amplifying the received signals, and broadcasting them using an omni-directional or directional antenna. Because the power attenuation is relatively close in all the radio frequency bands relayed by the radio relay station, the same proportion is adopted for amplification for the sake of simple design. For example, the signal receiving intensity of the frequency point 1 is-90 dBm, the signal receiving intensity of the frequency point 2 is-91 dBm, the signal emitting intensity of the frequency point 1 is-60 dBm and the frequency point 2 is-61 dBm through the amplifier with the full-band 30 dB. For example, a schematic diagram of the operating frequency of a typical GSM downlink wireless repeater, the attenuation of all frequencies is substantially the same in the frequency interval of 935-954MHz, so that the wireless repeater employs equal power amplification at all frequency points.
Because the wireless relay station only receives, amplifies and forwards the radio frequency signals and adopts the equal power multiple amplification relay, the relay station equipment does not have baseband processing and application layer processing, an operating system is not needed, and the complexity and the cost of the whole equipment can be obviously reduced. However, in the field of power carrier communication, since transmission attenuation of signals between different frequencies on a power cable is greatly different, (for example, attenuation values on frequency points of 1MHz and 50MHz may be different by 50dB or more in transmission distance of 10km using a power carrier). If the same ratio is used for signal amplification, in order to avoid that the high-frequency signal does not exceed the power limit, the signal needs to be amplified aiming at the attenuation condition of the signal with lower frequency, the signal amplification of the relatively high-frequency part is insufficient, the communication quality is reduced, and the quality of the relayed signal is limited.
Disclosure of Invention
The invention aims to provide a power carrier communication system supporting long-distance transmission, which aims to solve the problem that signals in all frequency ranges cannot be amplified to the maximum allowable transmission power when relay equipment is used for relaying power carrier communication, so that the relay distance of the power carrier can be increased to the maximum.
In order to achieve the purpose, the invention adopts the following technical scheme:
a power carrier communication system supporting long-distance transmission comprises a first power carrier communication module, a second power carrier communication module, power carrier filtering equipment and power carrier filtering equipment; the first power carrier communication module and the second power carrier communication module are connected, the first power carrier communication module and the second power carrier communication module are both connected to power carrier filtering equipment, and each power carrier filtering equipment is connected to power carrier modulation equipment; the first carrier communication module amplifies an input signal and outputs the amplified signal to the output end of the second power carrier communication module; the second power carrier communication module amplifies the input signal and outputs the amplified signal to the first carrier communication module;
the first power carrier communication module comprises a power carrier communication signal amplification module, a power detection module and a plurality of circulators; the circulator, the power detection module and the power carrier communication signal amplification module are sequentially connected; each circulator is connected to the power carrier filtering equipment;
the second power carrier communication module comprises a power carrier communication signal amplification module, a power detection module, a circulator and a splitter; the circulator, the power detection module and the power carrier communication signal amplification module are sequentially connected, and the power carrier communication signal amplification module is connected with the shunt; the power detection module respectively detects the power of the power carrier communication signals with the power carriers filtered out at not less than two frequency points, and transmits the power values of the detected power carrier communication signals to the power carrier communication signal amplification module; and the power carrier communication signal amplification module adjusts the amplification factor of the amplifier to the maximum allowable transmission power of each frequency point according to the power value from the power detection module.
Further, the circulator is located at the position of the power carrier signal input, and is used for receiving the input power carrier signal and separating the output end of the input power carrier signal from the input end.
Further, when the number of input signals of the first power carrier communication module is more than 1, the number of circulators of the first power carrier communication module is more than one, and at this time, a combiner is connected to the circulators, the combiner is respectively connected with the power detection module and the circulators, and a splitter of the second power carrier communication module is connected with the circulators of the first power carrier communication module; the combiner in the first power carrier communication module needs to be connected with the output ports of the plurality of circulators to combine the input signals from the plurality of power carriers, and the combiner is used for amplifying the communication signals of the plurality of power carriers.
Further, when there are more than one circulators of the first power carrier communication module, the second power carrier communication module needs to use a splitter to split the amplified signal output by the second power carrier communication module to the circulators of the plurality of first power carrier communication modules, and the splitter is connected to the power carrier communication signal amplification module and the circulator of the first power carrier communication module respectively.
Further, the power detection module in the first power carrier communication module is connected to the output port of the combiner.
Further, the power carrier communication system may include more than two power carrier communication modules, and may be capable of performing mutual relaying between more than two power carrier communication signals.
Further, the system is used in a relay system of any wired electric signal transmission device.
Compared with the prior art, the invention has the following technical effects:
by introducing the power carrier communication signal relay equipment, the invention can finish the relay of the power carrier signal only by using the radio frequency signal processing circuit in the communication processor because an application processing module structure can be removed, and the system design is simpler, the cost is reduced and the power consumption is lower.
The invention can adjust the power amplification factor of the signals on different frequencies along with the fading degree of the signals according to the different fading degrees of the power carrier communication signals on different frequency points through a frequency point detection mechanism, and realize that the signals on all the frequency points are amplified to the maximum allowable transmitting power, thereby resisting the attenuation loss of the signals at a longer distance and realizing the relay at the longer distance.
Drawings
Fig. 1 shows a conventional power carrier relay system structure.
Fig. 2 is a schematic diagram of the system of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
referring to fig. 2, a power line carrier communication system supporting long-distance transmission includes a first power line carrier communication module, a second power line carrier communication module, a power line carrier filtering device, and a power line carrier filtering device; the first power carrier communication module and the second power carrier communication module are connected, the first power carrier communication module and the second power carrier communication module are both connected to power carrier filtering equipment, and each power carrier filtering equipment is connected to power carrier modulation equipment.
The first power carrier communication module comprises a power carrier communication signal amplification module, a power detection module and a circulator; the circulator, the power detection module and the power carrier communication signal amplification module are sequentially connected, when a plurality of input signals exist, a combiner needs to be introduced, and the combiner is connected with the circulators and combines the plurality of input power carrier communication signals; each circulator is connected with power carrier wave filtering equipment;
the second power carrier communication module comprises a power carrier communication signal amplification module, a power detection module and a circulator; the circulator, the power detection module and the power carrier communication signal amplification module are sequentially connected. When the signal of the power carrier communication signal amplification module needs to be output to the power splitters of the plurality of output ends, a splitter needs to be introduced, and the splitter outputs the separated multipath signals to the circulator input ports corresponding to the plurality of output signals;
and the power carrier communication signal amplification module of the first power carrier communication module is connected with the circulator of the second power carrier communication module. The splitter of the second power carrier communication module is connected to the plurality of circulators of the first power carrier communication module.
A circulator: at the location of the signal input. For bidirectional power carrier communication signals, after power carrier signal filtering, uplink and downlink power carrier communication signals need to be distinguished by using a circulator, power detection is performed on the power carrier communication signals in each frequency point in the uplink and downlink directions, and finally power amplification is performed in the uplink and downlink directions. The circulator may be implemented using a commercially available radio frequency signal circulator.
The circulator needs to be connected with power carrier wave filtering equipment of a peripheral circuit and receives an input power carrier wave communication signal; the circulator is also connected with power carrier communication signal amplification modules of other power carrier communication modules, and receives relay amplification signals from other ports which need to be sent back to the signal port. The circulator also needs to be connected with a power detection module, and the circulator sends the input signal to the power detection module to detect the power of the input signal on different frequency points.
A combiner: if the power carrier communication module amplifies the power carrier communication signals input in multiple paths, a combiner is first required to combine the multiple paths of power carrier communication signals before amplification. And then carrying out power detection on each frequency point on the combined power carrier communication signal, and finally carrying out signal amplification output according to a detection result. The combiner may be implemented using a commercially available radio frequency signal combiner.
The combiner needs to be connected with the output ports of the circulators to combine the output signals of the circulators. The combiner needs to be connected to a power detection circuit.
A power detection module: the power detection module transmits the detected signal power values of different frequency bands to the power carrier communication signal amplification module; the power carrier communication signal amplification module adjusts the amplification factor of the amplifier to amplify the high-frequency modulation signals on different frequency points to the maximum allowable transmitting power according to the high-frequency modulation signal power value from the power detection module.
The frequency interval detected by the power detection module can be selected according to the frequency point of the transmission power carrier communication signal and the transmission characteristic of the transmission cable. The interval of the frequency points for the set power detection can be fixed, or can be designed in a variable interval mode according to the transmission characteristics of the transmission cable.
The power detection module transmits the detected power value of the power carrier communication signal to the power carrier communication signal amplification module. If the transmission distance and the topology of the cable are preset and will not change, the power detection module can directly send the values measured in advance to the power carrier communication signal amplification module without actually performing power detection.
The power detection module is connected with an output port of the circulator, optionally, when multiple input signals need to be subjected to power detection, the multiple input signals are combined through the combiner, and the power detection module is connected with the output port of the combiner. The output port of the power detection module is connected with the power carrier communication signal amplification module.
Power line carrier communication signal amplification module: the power carrier communication signal amplification module only needs to process a high-frequency-band low-power communication signal, and the amplification factor of the amplifier is adjusted to amplify signals on different frequency points to the maximum allowable transmission power according to the signal value from the power detection module. For example, the signal receiving power spectral density of the 20MHz frequency point is-60 dBm/Hz, the signal receiving power spectral density of the 40MHz frequency point is-62 dBm/Hz, the signal receiving power spectral density of the 60MHz frequency point is-65 dBm/Hz, and according to the maximum transmitting power limit value of power carrier communication (for example, -50dBm/Hz in the united states), the signal corresponding to the 20MHz frequency point should be amplified by 12dB, the corresponding amplified signal frequency range should be respectively expanded by one frequency band around 20MHz, the specific width should be determined according to the measured frequency point range, for example, 0-30MHz of this example, the signal corresponding to 30-50MHz is amplified by 12dB, and the signal corresponding to 50-60MHz is amplified by 15 dB.
The power carrier communication signal amplification module is connected with the power detection module and receives power detection results of power carrier communication signals with different frequency points from the signal detection module. The power carrier communication signal amplification module is also connected with the circulator input port of the power cable needing to be output, and outputs the amplified power carrier communication signal. The power carrier communication signal amplification module only processes a low-power communication signal of a high frequency band, and can be realized by using a commercial radio frequency signal amplifier.
By using the power carrier communication signal amplification module, aiming at different degrees of power carrier communication signal fading on different frequency points, the power amplification factor of signals on different frequencies can be adjusted along with the signal fading degree through a frequency point detection mechanism, and the signals on all the frequency points are amplified to the maximum allowable transmitting power, so that the attenuation loss of the signals at a longer distance can be resisted, and the relay at the longer distance is realized. A splitter: optionally, when the amplified power carrier communication signal needs to be output to multiple ports, the amplified power carrier communication signal needs to be sent to a splitter, split to a circulator with multiple output ends, and output to the power cable through the circulator. The splitter may be implemented using a commercially available rf signal power splitter.
The splitter is connected to the signal amplification module to be split, and also needs to connect the split signal to the input ports of the plurality of circulators that need to output signals.
The peripheral circuit requires a power carrier filtering module: because the power carrier communication signal is modulated on a high-power signal, before the frequency point power detection is carried out, firstly, a low-frequency alternating current signal in the power carrier signal needs to be filtered, for example, a 50Hz alternating current is used domestically, the power carrier signal needs to be isolated by using a filtering device, the filtered power carrier communication signal is a high-frequency signal on a 0-50MHz frequency band, and the signal can be used for carrying out the power detection. The filtering module may be implemented using a commercially available high frequency coupler. The filtered power carrier communication signal is a low-power radio-frequency signal (the general power value is less than-20 dBm) with 0-50MHz, so that the power carrier communication signal relay equipment only needs to process the radio-frequency signal and does not need a high-power alternating-current circuit, and the power carrier communication signal relay equipment can be realized by using a common CMOS (complementary metal oxide semiconductor) process.
The power carrier filtering module needs to be connected with a signal port of the circulator corresponding to the signal.
The peripheral circuit further includes a power carrier modulation device: the high-frequency signal of the power carrier communication is modulated on a low-frequency alternating current power signal of 50Hz through a power carrier modulation device at the front end of the power cable, and finally the high-frequency signal is relayed to a power carrier medium.
The power carrier modulation device needs to be connected to a power carrier filter device.
Claims (7)
1. A power carrier communication system supporting long-distance transmission is characterized by comprising a first power carrier communication module, a second power carrier communication module and power carrier filtering equipment; the first power carrier communication module and the second power carrier communication module are connected, the first power carrier communication module and the second power carrier communication module are both connected with power carrier filtering equipment, and each power carrier filtering equipment is connected with power carrier modulation equipment; the first carrier communication module amplifies an input signal and outputs the amplified signal to the output end of the second power carrier communication module; the second power carrier communication module amplifies the input signal and outputs the amplified signal to the first carrier communication module;
the first power carrier communication module comprises a power carrier communication signal amplification module, a power detection module and a plurality of circulators; the circulator, the power detection module and the power carrier communication signal amplification module are sequentially connected; each circulator is connected with power carrier wave filtering equipment;
the second power carrier communication module comprises a power carrier communication signal amplification module, a power detection module, a circulator and a splitter; the circulator, the power detection module and the power carrier communication signal amplification module are sequentially connected, and the power carrier communication signal amplification module is connected with the shunt; the power detection module respectively detects the power of the power carrier communication signals with the power carriers filtered out at not less than two frequency points, and transmits the power values of the detected power carrier communication signals to the power carrier communication signal amplification module; and the power carrier communication signal amplification module adjusts the amplification factor of the amplifier to the maximum allowable transmission power of each frequency point according to the power value from the power detection module.
2. The power carrier communication system supporting long distance transmission as claimed in claim 1, wherein the circulator is located at the input of the power carrier signal for receiving the input power carrier signal and separating the input power carrier signal from the output.
3. The power carrier communication system supporting long-distance transmission according to claim 1, wherein optionally, when the input signal of the first power carrier communication module is more than 1, the number of circulators of the first power carrier communication module is more than one, and at this time, the first power carrier communication module is connected to the circulators by using a combiner, the combiner is connected to the power detection module and the circulators, respectively, and the splitter of the second power carrier communication module is connected to the circulator of the first power carrier communication module; the combiner in the first power carrier communication module needs to be connected with the output ports of the plurality of circulators to combine the input signals from the plurality of power carriers, and the combiner is used for amplifying the communication signals of the plurality of power carriers.
4. The power carrier communication system supporting long-distance transmission according to claim 3, wherein when there are more than one circulators of the first power carrier communication module, the second power carrier communication module needs to use a splitter to split the amplified signal output from the second power carrier communication module to the circulators of the plurality of first power carrier communication modules, and the splitter is connected to the power carrier communication signal amplification module and the circulator of the first power carrier communication module.
5. The power carrier communication system supporting long-distance transmission according to claim 1, wherein the power detection module of the first power carrier communication module is connected to the output port of the combiner.
6. The power carrier communication system supporting long-distance transmission according to any one of claims 1 to 5, wherein the power carrier communication system comprises more than two power carrier communication modules and is capable of performing mutual relaying between more than two power carrier communication signals.
7. A power carrier communication system supporting long distance transmission according to claim 6, wherein the system is used in a relay system of any wired electric signal transmission equipment.
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| CN115065374A (en) * | 2022-04-27 | 2022-09-16 | 深圳市国电科技通信有限公司 | Power line carrier communication transceiver and power line carrier communication system |
| CN116743211B (en) * | 2023-08-16 | 2023-10-27 | 北京前景无忧电子科技股份有限公司 | Anti-interference method for power carrier communication |
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