Power line carrier communication method

Abstract

The present invention provides a high-precision power line carrier communication method, which belongs to the field of power line communication technology, including: taking one of the devices as the starting point, the identification signal corresponding to the device is combined with the detection signal and the calibration signal and sent to the receiving device. The receiving device calls the corresponding functional module according to the detection signal to demodulate the identification signal and the calibration signal; the reset calibration signal, the verified detection signal, the verified identification signal and the identification signal of the receiving device are sent to the next device together. According to the addresses indicated by multiple identification signals, the transmission relationship of the devices is clarified and communication is established. The high-precision power line carrier communication method provided by the present invention can verify the detection signal and the identification signal through the calibration signal, and the verified signal can reduce the influence of noise, ensure the accuracy of transmission and the credibility of information transmission.

Description

Technical Field

[0001] The present invention belongs to the technical field of power line communication, and more specifically, relates to a high-precision power line carrier communication method. Background Art

[0002] The power line carrier communication circuit uses the power line for data communication. In order to realize the carrier signal, the carrier signal needs to be amplified and a series of processing. The future power grid must be an integrated automation system for electricity consumption, billing, and communication. Since the carrier communication uses the power line itself as a transmission channel, it has incomparable advantages as a communication means, and the application scope and prospects of power line carrier communication in the fields of household appliance automation control will be very broad. Therefore, power line carrier communication has huge economic benefits and significant social benefits.

[0003] However, due to the serious harmonic interference of the power grid, the lack of mandatory standards for electrical noise restrictions, the large number of branches of the low-voltage distribution network, and its complex topology, the network impedance is time-varying and nonlinear. In such a harsh power grid environment, the key to realizing power line carrier communication technology lies in solving the problems of impedance matching, power line signal attenuation, noise and interference of the power line network. However, the existing power line carrier communication method cannot accurately identify the address of the device due to the pollution of noise, and the credibility of the final data is poor. Summary of the invention

[0004] The purpose of the present invention is to provide a high-precision power line carrier communication method, aiming to solve the problem that the address of the device cannot be accurately identified due to pollution such as noise, and the credibility of the final data is poor.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a high-precision power line carrier communication method, including:

[0006] Encode the addresses of multiple devices and form corresponding identification signals;

[0007] Taking one of the devices as the starting point, the identification signal corresponding to the device is combined with the detection signal and the calibration signal and sent to the receiving device;

[0008] The receiving device calls the corresponding function module according to the detection signal to demodulate the identification signal and the calibration signal; determines the current power line noise pollution through the calibration signal, and verifies the detection signal and the identification signal according to the calibration signal; resets the calibration signal, and sends the reset calibration signal, the verified detection signal, the verified identification signal and the identification signal of the receiving device to the next device;

[0009] According to the addresses indicated by multiple identification signals, the transmission relationship of the devices is clarified and communication is established.

[0010] In a possible implementation, the combining of the identification signal corresponding to the device with the detection signal and the calibration signal and sending the combined signals to the receiving device includes:

[0011] Combining the detection signal, the calibration signal and a plurality of identification signals arranged in sequence into a detection signal;

[0012] The detection signal is used to be sent to the next device together.

[0013] In a possible implementation, combining the detection signal, the calibration signal, and a plurality of identification signals arranged in sequence into a detection signal includes:

[0014] A segmentation signal is provided between the detection signal and the calibration signal, between the calibration signal and the identification signal, and between multiple identification signals.

[0015] In a possible implementation manner, the segmentation signal is a spatial segment or a specially arranged pulse combination.

[0016] In a possible implementation, determining the current power line noise pollution condition by using the calibration signal includes:

[0017] The device stores a calibration signal when it is not contaminated by noise. The received identification signal is compared with the stored calibration signal to determine the noise contamination situation.

[0018] In a possible implementation manner, the calibration signal not contaminated by noise is stored in the device, including:

[0019] Compare the received identification signal with the stored calibration signal that is not contaminated by noise one by one and determine the analogy relationship of the same elements;

[0020] The detection signal and the identification signal are verified through the analog relationship.

[0021] In a possible implementation, the combining of the identification signal corresponding to the device with the detection signal and the calibration signal and sending the combined signals to the receiving device includes:

[0022] Setting a level on the detection signal, and when the device receives the detection signal, reducing the level by 1;

[0023] When the level is 0, the device receiving the detection signal will reply to the received and verified multiple identification signals and its own identification signal in sequence.

[0024] In a possible implementation manner, after the transmission relationship of the devices is clarified and the communication is established, the method further includes:

[0025] Before data transmission is performed through the determined device transmission relationship, the noise pollution situation on the current power line path is determined.

[0026] In a possible implementation manner, determining the noise pollution condition on the current power line path includes:

[0027] The data to be transmitted is segmented into multiple data segments, and a calibration signal is added to the front side of each data segment;

[0028] The target device determines the noise pollution in the current environment through the calibration signal.

[0029] In a possible implementation manner, the target device determines the noise pollution situation in the current environment through the calibration signal, including:

[0030] The target device makes targeted adjustments to the corresponding data segment according to the calibration signal at the front side of the data segment.

[0031] The high-precision power line carrier communication method provided by the present invention has the beneficial effect that, compared with the prior art, the high-precision power line carrier communication method of the present invention first encodes the addresses of multiple devices and forms corresponding identification signals. When it is necessary to determine the transmission relationship of the devices, one of the devices is used as the starting point, and the device sends an identification signal, a detection signal and a calibration signal to the receiving device.

[0032] After receiving the detection signal, the receiving device will call the corresponding function module and demodulate the identification signal and calibration signal through the function module. The noise pollution can be determined by the calibration signal, and the detection signal and identification signal can be verified according to the calibration signal. When the verification is completed, the calibration signal is reset, and the reset calibration signal, the verified detection signal, the verified identification signal and the identification signal of the receiving device are sent to the next device.

[0033] Finally, the address referred to can be determined through multiple identification signals, and communication can be established through the address. In this application, the detection signal and the identification signal can be checked by the calibration signal, and the checked signal can reduce the influence of noise, ensure the accuracy of transmission and the credibility of information transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A flow chart of a high-precision power line carrier communication method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] See also Figure 1 The high-precision power line carrier communication method provided by the present invention is now described. The high-precision power line carrier communication method comprises:

[0038] The addresses of multiple devices are encoded and formed into corresponding identification signals.

[0039] Taking one of the devices as the starting point, the identification signal corresponding to the device is combined with the detection signal and the calibration signal and sent to the receiving device.

[0040] The receiving device calls the corresponding functional module according to the detection signal to demodulate the identification signal and the calibration signal; determines the current power line noise pollution situation through the calibration signal, and verifies the detection signal and the identification signal according to the calibration signal; resets the calibration signal, and sends the reset calibration signal, the verified detection signal, the verified identification signal and the identification signal of the receiving device to the next device.

[0041] According to the addresses indicated by multiple identification signals, the transmission relationship of the devices is clarified and communication is established.

[0042] The high-precision power line carrier communication method provided by the present invention has the beneficial effect that, compared with the prior art, the high-precision power line carrier communication method of the present invention first encodes the addresses of multiple devices and forms corresponding identification signals. When it is necessary to determine the transmission relationship of the devices, one of the devices is used as the starting point, and the device sends an identification signal, a detection signal and a calibration signal to the receiving device.

[0043] After receiving the detection signal, the receiving device will call the corresponding function module and demodulate the identification signal and calibration signal through the function module. The noise pollution can be determined through the calibration signal, and the detection signal and identification signal can be verified according to the calibration signal. When the verification is completed, the calibration signal is reset, and the reset calibration signal, the verified detection signal, the verified identification signal and the identification signal of the receiving device are sent to the next device.

[0044] Finally, the address referred to can be determined through multiple identification signals, and communication can be established through the address. In this application, the detection signal and the identification signal can be checked by the calibration signal, and the checked signal can reduce the influence of noise, ensure the accuracy of transmission and the credibility of information transmission.

[0045] Power line carrier communication refers to a communication technology that uses power lines as a medium to achieve data transmission. Since power lines are the most popular and widely covered physical media, using power lines to transmit data information can effectively reduce operating costs and reduce the expenditure of building new communication networks. Therefore, power line communication technology is becoming a hot spot in the development of information technology.

[0046] Power line communication, according to the frequency used, can usually be divided into power line narrowband carrier communication and power line broadband carrier communication. With the construction of my country's smart grid, the power consumption information collection system using low-voltage power line narrowband carrier communication technology has taken shape. However, with the continuous deepening of the business functions of the collection system, the inherent weaknesses of power line narrowband carrier communication, such as low speed, poor real-time performance, and inability to achieve full-duplex communication, have gradually been exposed. How to improve the success rate and efficiency of power user power consumption information collection is an issue that needs to be urgently addressed.

[0047] In actual situations, the amplitude of low-order harmonic components is relatively large, which is the main factor affecting communication quality. Therefore, detecting and eliminating noise in the transmission process of low-voltage power line carrier signals is of great significance to improving the quality of carrier communication and the research on the interchangeability of carrier communication modules.

[0048] As the most widely used local communication method in the electricity information collection system, low-voltage power line carrier communication has become a strong competitive solution to the "last mile" problem with its advantages such as wide coverage and easy installation. However, compared with traditional communication media, low-voltage power line carrier communication technology uses shared power lines as the communication medium. The openness and sharing of the communication medium determine that its communication process is easily affected by the power network environment. How to choose a suitable noise processing solution at the receiver is of great significance to improving the performance of carrier communication.

[0049] In existing communication technologies, the wavelet packet transform method is often used to achieve carrier signal noise reduction. The wavelet packet transform method is derived from Fourier analysis. The wavelet can be translated forward and backward along the time axis, and proportionally stretched and compressed to obtain low-frequency and high-frequency wavelets, thereby extracting useful signals from noise-containing signals. However, the carrier signal noise reduction effect obtained by this method is limited, and the calculation amount is large and the filtering time is long.

[0050] In the construction of the electricity consumption information collection system of the modern smart grid, the downlink communication of its collection equipment mainly adopts low-voltage power line carrier communication technology. The electricity consumption information collection system includes the main station layer, the communication channel layer, the collection equipment layer and the metering equipment layer. The collection equipment reads the user data through the downlink communication of the metering equipment, and then uses a variety of communication channels for uplink communication to transmit the data to the main station. There are many unfavorable factors in power line carrier communication, such as large signal attenuation, real-time changes in line impedance, and strong noise interference, which affect low-voltage power line carrier communication. In order to improve the stability and real-time performance of low-voltage power line carrier communication, it is necessary to extract and analyze the waveform and amplitude changes of the low-voltage power line carrier signal in real time, and find out the fault points that cause excessive high-frequency noise interference, signal attenuation, and real-time changes in internal impedance, so as to facilitate targeted processing.

[0051] In this application, it is first necessary to find out the connection relationship between various devices, so as to provide a basis for the subsequent establishment of communication. To this end, it is necessary to implement an upload module in each device, which is used to upload specific signals so that they can be received by the host computer, etc. The device replies with the signal through the upload module, and the host computer determines the transmission relationship of the signal based on the final signal.

[0052] In order to find out the subordinate relationship, the addresses of all the devices involved need to be encoded in advance according to certain specifications, and the corresponding identification signal is generated after the encoding is completed. In addition, in order to realize the forwarding and communication of signals through the power line, an encoder is set on each device.

[0053] Since the noise on the power line is relatively complex, the transmitted signal may be mixed with a lot of noise, that is, the signal-to-noise ratio of the signal is low, which to some extent affects the development of power carrier communication. In order to solve this problem, when sending a detection signal from one of the devices as the starting point, a calibration signal needs to be added to the back of the detection signal, and an identification signal needs to be added to the back of the calibration signal.

[0054] The detection signal, calibration signal and identification signal are combined into a detection signal. When other devices receive the detection signal, they will first be exposed to the detection signal. Because the reception of the detection signal indicates that the transmission relationship needs to be determined, the demodulator on the device starts to demodulate the signal.

[0055] After the device reads the calibration signal, it can make a certain judgment on the current noise situation, so that it can read the identification signal more accurately. After reading the identification signal, it will attach its own identification signal to the back of the original detection signal, indicating that there is a transmission relationship between the two.

[0056] In some embodiments of the high-precision power line carrier communication method provided in the present application, the identification signal corresponding to the device is combined with the detection signal and the calibration signal and sent to the receiving device, including:

[0057] The detection signal, the calibration signal and a plurality of identification signals arranged in sequence are combined into a detection signal.

[0058] The detection signal is used to send to the next device together.

[0059] Before the devices establish communication, the addresses between the devices cannot be quickly identified, and there are many noise components on the power line. If a device reads and attaches its own identification information without any noise reduction processing after receiving the detection signal, it will eventually cause other devices to be unable to accurately receive and demodulate the detection signal, or even if they receive the detection signal, they will not be able to accurately identify the address information referred to in the detection signal.

[0060] In the prior art, multiple noise reduction algorithms are mostly used to perform noise reduction on signals. Although this method can improve the signal-to-noise ratio to a certain extent, once the noise exceeds a threshold, or the noise interferes with the original signal to a certain extent, the final result is that even through noise reduction, the key information in the signal can no longer be effectively identified.

[0061] In order to solve the above problems in the present application, multiple detection signals and detection signal encoding rules are stored in each device. After the device accurately reads multiple identification signals through the calibration signal, the encoder in the device will emit a detection signal without noise interference, and will emit a calibration signal without noise according to the encoding rule of the calibration signal, and will also attach multiple identification signals and its own identification signal. Through the above settings, the influence of noise is avoided as much as possible.

[0062] That is, a detection signal containing noise can be refreshed through one device to reduce the impact of noise.

[0063] In some embodiments of the high-precision power line carrier communication method provided in the present application, combining the detection signal, the calibration signal, and a plurality of identification signals arranged in sequence into a detection signal includes:

[0064] A segmentation signal is provided between the detection signal and the calibration signal, between the calibration signal and the identification signal, and between multiple identification signals.

[0065] Because the detection signal includes a detection signal, a calibration signal and multiple identification signals, and because it is transmitted through power lines, the device may confuse the detection signal with the calibration signal, confuse the calibration signal with the identification signal, and confuse multiple identification signals. This means that even if the noise problem is solved, the final data cannot be accurately picked up due to signal confusion.

[0066] In order to solve the above problems, in the present application, a split signal can be set between the detection signal and the calibration signal, between the calibration signal and the identification signal, and between two adjacent identification signals. The split signal can enable the device to accurately pick up each relatively independent signal, thereby improving the signal picking precision and accuracy.

[0067] In some embodiments of the high-precision power line carrier communication method provided in the present application, the segmented signal is a spatial segment or a specially arranged pulse combination.

[0068] The segmentation signal is used to divide signals belonging to different series. In order to achieve a certain segmentation effect, different types of segmentation signals can be selected.

[0069] If there are no high requirements on the transmission efficiency, the segmentation signal can be a blank segment of a period of time. The detection signal, calibration signal and multiple identification signals are all continuous. When these continuous signals are interrupted, it means that the front and back sides of the interrupted signal, that is, the segmentation signal, refer to different data.

[0070] When there are certain requirements for transmission efficiency, if the segmentation signal is set to blank and lasts for a certain period of time, it will affect the final efficiency. Based on the above situation, the segmentation signal can be set to a short pulse combination that is different from other signals. These pulse combinations can be extreme values ​​in two different directions, or last for a period of time at a certain extreme value. Through this setting, the device can clearly understand that the pulse combination does not belong to the detection signal, calibration signal, and identification signal. The device uses this pulse combination to segment the continuously transmitted signal.

[0071] In some embodiments of the high-precision power line carrier communication method provided in the present application, determining the current power line noise pollution condition by calibration signal includes:

[0072] The device stores a calibration signal when it is not contaminated by noise. The received identification signal is compared with the stored calibration signal to determine the noise contamination situation.

[0073] The noise pollution in the power grid system is quite serious, which has a great impact on power line carrier communication. If there is no calibration signal, the identification signal is directly transmitted on the power line. Even if another device receives the identification signal, it will not be able to accurately determine the address referred to by the identification signal due to the large amount of noise.

[0074] In order to solve the above problem, a calibration signal is added to the front side of the identification signal, and the calibration signal can be regarded as a pulse train with a certain regularity. This pulse train includes all possible states of the identification signal.

[0075] In some embodiments of the high-precision power line carrier communication method provided in the present application, the calibration signal stored in the device when it is not contaminated by noise includes:

[0076] The received identification signal is compared one by one with the stored calibration signal that is not contaminated by noise and the analog relationship of the same elements is determined.

[0077] Through analogy, the detection signal and identification signal are verified.

[0078] For the sake of convenience, the calibration signal can be arranged in ascending order from 1 to 10. After receiving the calibration signal, the device analyzes it according to the actual situation of receiving 1 to 10. That is, due to the presence of noise, the received calibration signal changes to 1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, 9.9, and 11, while the received identification signal on the rear side is 4.4, 7.7, and 9. This is because of the presence of noise. At this time, according to the identification signal and the calibration signal, it can be accurately read that the identification signal actually refers to 4, 7, and 9.

[0079] In some embodiments of the high-precision power line carrier communication method provided in the present application, the identification signal corresponding to the device is combined with the detection signal and the calibration signal and sent to the receiving device, including:

[0080] Set a level on the detection signal, and when the device receives the detection signal, reduce the level by 1.

[0081] When the level is 0, the device receiving the detection signal will reply with the received and verified multiple identification signals and its own identification signal in sequence.

[0082] There are many devices in the power system. It takes a certain amount of time for the device to receive the detection signal from the power line and read the detection signal. It also needs to be encoded before the device forwards it. If the signal to be encoded is long, it will undoubtedly increase the time required to determine the transmission relationship between devices. After being forwarded multiple times, the signal may be partly erroneous due to problems such as random errors in the encoding, resulting in communication abnormalities.

[0083] In order to solve the above problems, a corresponding level is set on each detection signal. Although the type of the detection signal is the same after forwarding, the corresponding level will be reduced. When a device receives the detection signal and the level is reduced to 0, then when the last device completes demodulation and encoding, it will reply the received detection signal and its own identification information. By obtaining and analyzing the reply information, the transmission process of the detection signal can be determined.

[0084] In some embodiments of the high-precision power line carrier communication method provided in the present application, after the transmission relationship of the devices is clarified and the communication is established, the method further includes:

[0085] Before data transmission is performed through the determined device transmission relationship, the noise pollution situation on the current power line path is determined.

[0086] Noise pollution in the power grid system is quite serious, especially the large number and variety of electrical appliances connected to the low-voltage power lines, which has a great impact on power line carrier communication. There are two main types of noise in the power grid: one is non-artificial noise, such as the noise generated by lightning on the power line; the other is artificial noise, which comes from various electrical appliances, power transmission equipment, etc. The main factor affecting power line communication is artificial noise, among which pulse noise and harmonic noise interference are the most serious. For random pulse noise, it is generally generated by the connection of electrical appliances. It is a non-Gaussian distribution noise with a pulse width of no more than 3ms and sparseness in the time domain; while the harmonic noise generated on the power line, especially the 3rd, 5th, and 7th harmonics, is distributed at certain frequency points under the condition of a certain power frequency, which satisfies the sparsity in the frequency domain.

[0087] After communication is established through the detection signal, the amount of data transmitted after communication is established is large, which takes a long time, and the degree of influence of power line noise changes with the passage of time. This causes the transmitted data to be distorted by noise when data is transmitted through the power line, and the degree of distortion changes with time.

[0088] In order to avoid the above problems, it is necessary to test the current noise situation while transmitting data, and adjust the device transmitted to the target based on the test results, ultimately ensuring that the data is accurate and not lost.

[0089] In some embodiments of the high-precision power line carrier communication method provided in the present application, determining the noise pollution condition on the current power line path includes:

[0090] The data to be transmitted is segmented into multiple data segments, and a calibration signal is added to the front side of each data segment.

[0091] The target device determines the noise pollution in the current environment through the calibration signal.

[0092] In order to accurately transmit data, the data to be transmitted may be segmented, and a calibration signal may be directly added between two adjacent data segments. It is necessary to ensure that there is a calibration signal at the front side of a data segment.

[0093] In actual application, the target device will first read the calibration signal, and then determine the degree to which the data is affected by noise in the current environment based on the calibration signal, and then adjust the subsequently received data segment based on the received calibration signal. Therefore, the device stores the calibration signal with or without noise pollution, and compares the calibration signal without noise pollution with the received calibration signal, so as to determine the degree of noise influence and make targeted adjustments to the signal segment. A set of data is analyzed and adjusted by segmentation, and multiple data can be checked in a targeted manner, ultimately ensuring the accuracy of data transmission.

[0094] In some embodiments of the high-precision power line carrier communication method provided in the present application, the target device determines the noise pollution situation in the current environment through the calibration signal, including:

[0095] The target device makes targeted adjustments to the corresponding data segment based on the calibration signal at the front side of the data segment.

[0096] Through the above settings, the degree of verification for each data segment is different, which improves the accuracy and credibility of the data compared to verification according to one standard.

[0097] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision power line carrier communication method, characterized in that: include: Encode the addresses of multiple devices and form corresponding identification signals; Taking one of the devices as the starting point, the identification signal corresponding to the device is combined with the detection signal and the calibration signal and sent to the receiving device; The receiving device calls the corresponding function module according to the detection signal to demodulate the identification signal and the calibration signal; determines the current power line noise pollution through the calibration signal, and verifies the detection signal and the identification signal according to the calibration signal; resets the calibration signal, and sends the reset calibration signal, the verified detection signal, the verified identification signal and the identification signal of the receiving device to the next device; According to the addresses indicated by multiple identification signals, the transmission relationship of the devices is clarified and communication is established; Determining the current power line noise pollution situation by calibration signal includes: The device stores a calibration signal when it is not contaminated by noise. The received calibration signal is compared with the stored calibration signal to determine the noise contamination situation.

2. The high-precision power line carrier communication method according to claim 1, characterized in that: The combining of the identification signal corresponding to the device with the detection signal and the calibration signal and sending the combined signal to the receiving device comprises: The detection signal, the calibration signal and a plurality of identification signals arranged in sequence are combined into a detection signal.

3. The high-precision power line carrier communication method according to claim 2, characterized in that: The combining of the detection signal, the calibration signal and a plurality of identification signals arranged in sequence into a detection signal comprises: A segmentation signal is provided between the detection signal and the calibration signal, between the calibration signal and the identification signal, and between multiple identification signals.

4. The high-precision power line carrier communication method according to claim 3, characterized in that: The segmentation signal is a spatial segment or a specially arranged pulse combination.

5. The high-precision power line carrier communication method according to claim 1, characterized in that: The device stores a calibration signal when it is not contaminated by noise, and compares the received calibration signal with the stored calibration signal to determine the noise contamination condition, including: Compare the received calibration signal with the stored calibration signal not contaminated by noise one by one and determine the analogy relationship of the same elements; The detection signal and the identification signal are verified through the analog relationship.

6. The high-precision power line carrier communication method according to claim 1, characterized in that: The combining of the identification signal corresponding to the device with the detection signal and the calibration signal and sending the combined signal to the receiving device comprises: Setting a level on the detection signal, and when the device receives the detection signal, reducing the level by 1; When the level is 0, the device receiving the detection signal will reply to the received and verified multiple identification signals and its own identification signal in sequence.

7. The high-precision power line carrier communication method according to claim 1, characterized in that: After the transmission relationship of the devices is clarified and the communication is established, the following steps are further included: Before data transmission is performed through the determined device transmission relationship, the noise pollution situation on the current power line path is determined.

8. The high-precision power line carrier communication method according to claim 7, characterized in that: Determining the noise pollution situation on the current power line path includes: The data to be transmitted is segmented into multiple data segments, and a calibration signal is added to the front side of each data segment; The target device determines the noise pollution in the current environment through the calibration signal.

9. The high-precision power line carrier communication method according to claim 8, characterized in that: The target device determines the noise pollution situation in the current environment through the calibration signal, including: The target device makes targeted adjustments to the corresponding data segment according to the calibration signal at the front side of the data segment.

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