Multi-node dynamic power line channel simulation system

Abstract

The invention discloses a multi-node dynamic power line channel simulation system, which is applied to the technical field of power line communication and is used for solving the problem of limited authenticity and adaptability of power line channel simulation in the prior art. In the on-site power grid end channel characteristic acquisition system, a first power line channel characteristic acquisition device periodically sends an original excitation signal through an excitation signal sending module, and a second power line channel characteristic acquisition device receives the original excitation signal through an excitation signal receiving module. Collecting a current filter coefficient of the first filter when the original excitation signal is received each time, and transmitting the current filter coefficient to the communication simulation equipment; in the laboratory end communication simulation system, communication simulation equipment configures a current filter coefficient to a corresponding second filter for communication simulation, so that dynamic capture of channel characteristics changing along with changes of external factors such as air temperature and load is realized through periodic excitation signal transceiving and filter coefficient training acquisition; and the authenticity and adaptability of the power line channel during communication simulation are improved.

Description

Technical Field

[0001] The present application relates to the field of power line communication technology, and in particular to a multi-node dynamic power line channel simulation system. Background Art

[0002] During the development of power line carrier communication systems, the use of a power line channel simulation system is crucial to avoid the significant labor and time required for on-site deployment and testing. Existing power line channel simulation systems typically establish theoretical models of the power line channel based on circuit theory and channel theory. However, due to practical factors, these models often fail to fully reflect the true characteristics of the power line channel. Furthermore, these models are static and cannot reflect changes in the power line channel's characteristics caused by external factors such as temperature and load. This results in limited authenticity and adaptability of these systems for power line channel simulation. Summary of the Invention

[0003] This application provides a multi-node dynamic power line channel simulation system to solve the problems of limited authenticity and adaptability of power line channel simulation in the prior art, wherein: The multi-node dynamic power line channel simulation system provided by the present application includes an on-site grid-end channel characteristic acquisition system and a laboratory-end communication simulation system; the on-site grid-end channel characteristic acquisition system includes power line channel characteristic collectors respectively deployed at multiple on-site communication location nodes, each power line channel characteristic collector includes an excitation signal sending module and an excitation signal receiving module, and a first filter is provided in the excitation signal receiving module; the laboratory-end communication simulation system includes a communication simulation device, and the communication simulation device is provided with multiple second filters, each second filter having a one-to-one correspondence with a power line channel from the first power line channel characteristic collector to the second power line channel characteristic collector, the first power line channel characteristic collector is a power line channel characteristic collector deployed on one of the on-site communication location nodes, and the second power line channel characteristic collector is a power line channel characteristic collector deployed on other on-site communication location nodes except the on-site communication location node where the first power line channel characteristic collector is located; A first power line channel characteristic collector, configured to periodically send an original excitation signal to the power line channel via an excitation signal sending module; a second power line channel characteristic collector, configured to adjust the initial filter coefficient of the first filter to the current filter coefficient based on the actual received signal each time the original excitation signal transmitted through the power line channel is received through the excitation signal receiving module, collect the current filter coefficient of the first filter, and transmit the current filter coefficient to the communication simulation device; wherein the current filter coefficient is used to characterize the current power line channel characteristics of the power line channel from the first power line channel characteristic collector to the second power line channel characteristic collector; A communication simulation device is used to receive the current filter coefficients transmitted by the second power line channel characteristic collector, and configure the current filter coefficients into the target filter for communication channel simulation; wherein the target filter is the second filter corresponding to the power line channel from the first power line channel characteristic collector to the second power line channel characteristic collector.

[0004] Optionally, the excitation signal sending module includes a signal generating unit and a sending processing unit; A signal generating unit, configured to generate an original excitation signal and output the original excitation signal to the sending processing unit and the first filter; The sending processing unit is used to send the original excitation signal to the power line channel.

[0005] Optionally, the signal generating unit includes a signal generator; The signal generator is used to generate pseudo white noise by adopting a pseudo white noise generation algorithm, and output the pseudo white noise as an original excitation signal to the sending processing unit.

[0006] Optionally, the transmission processing unit includes a digital-to-analog converter, a first filter amplifier, and a first coupler; A digital-to-analog converter, used for performing digital-to-analog conversion on the original excitation signal; The first filter amplifier is used to filter and amplify the original excitation signal after digital-to-analog conversion; The first coupler is used to couple the original excitation signal after filtering and amplification processing to the power line.

[0007] Optionally, the excitation signal receiving module includes a receiving processing unit and a dynamic adjustment unit, and the dynamic adjustment unit is provided with a first filter; a receiving and processing unit, configured to receive and process an original excitation signal transmitted through the power line channel to obtain an actual receiving signal, and output the actual receiving signal to the dynamic adjustment unit; a first filter, configured to process the original excitation signal output by the signal generating unit based on the first filter coefficient to obtain a filtered output signal, and output the filtered output signal to the dynamic adjustment unit; wherein the first filter coefficient is an initial filter coefficient when the first filter coefficient is adjusted for the first time, and is a second filter coefficient obtained in a previous adjustment when the first filter coefficient is not adjusted for the first time; A dynamic adjustment unit is used to adjust the first filter coefficient by using a coefficient optimization algorithm based on the current error between the filtered output signal and the actual received signal to obtain the second filter coefficient when the target error function constructed based on the filtered output signal and the actual received signal is not lower than the error threshold; when the target error function constructed based on the filtered output signal and the actual received signal is lower than the error threshold, the second filter coefficient obtained by the last adjustment is determined as the current filter coefficient.

[0008] Optionally, the receiving processing unit includes a second coupler, a second filter amplifier and an analog-to-digital converter; a second coupler for extracting an original excitation signal from the power line channel; The second filter amplifier is used to filter and amplify the extracted original excitation signal; The analog-to-digital converter is used to perform digital-to-analog conversion on the original excitation signal after filtering and amplification to obtain the actual received signal and output it to the dynamic adjustment unit.

[0009] Optionally, the signal generation unit and the dynamic adjustment unit are deployed on an FPGA (Field Programmable Gate Array) or a SoC (System on Chip).

[0010] Optionally, the transmitting processing unit and the receiving processing unit are integrated into the analog front-end circuit.

[0011] Optionally, each power line channel characteristic collector further includes a wireless communication module; The wireless communication module is used to transmit the current filter coefficients to the communication analog device.

[0012] Optionally, the multi-node dynamic power line channel simulation system provided by the present application further includes a server; The server is used to forward the communication data between the communication simulation device and each power line channel characteristic collector; wherein the communication data includes the current filter coefficient or the user configuration parameter.

[0013] The beneficial effects of this application are as follows: The present application deploys a power line channel characteristic collector on each field communication location node in the field grid-end channel characteristic acquisition system, and can use the power line channel characteristic collector on each field communication location node in the field grid-end channel characteristic acquisition system to realize the function of sending and receiving excitation signals, so that the original excitation signal can be periodically sent to the power line channel by the power line channel characteristic collector on one of the field communication location nodes. When the power line channel characteristic collectors on other field communication location nodes receive the original excitation signal each time, the initial filter coefficient of the first filter is adjusted to the current filter coefficient that characterizes the current power line channel characteristics based on the actual received signal, and then the current filter coefficient of the first filter is collected and transmitted to the communication simulation device. Then, through the periodic sending and receiving of the original excitation signal and the collection of the current filter coefficient, the dynamic capture of the channel characteristics that change with external factors such as temperature and load is achieved. Then, when the current filter coefficient is configured into the second filter corresponding to the power line channel from the first power line channel characteristic collector to the second power line channel characteristic collector through the communication simulation device for communication simulation, the authenticity and adaptability of the power line channel simulation can be improved, thereby improving the simulation effect of the power line channel.

[0014] Other features and advantages of the present application will be described in the following description, and in part, will become apparent from the description or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures particularly pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A schematic diagram of the structure of a multi-node dynamic power line channel simulation system in an embodiment of the present application; Figure 2 This is a schematic diagram of the composition structure of the power line channel characteristic collector in an embodiment of the present application; Figure 3 Schematic diagram of the filter coefficient update principle of the first filter in an embodiment of the present application; Figure 4 This is another structural diagram of a multi-node dynamic power line channel simulation system according to an embodiment of the present application; Figure 5 Schematic diagram of the corresponding relationship between the second filter and the power line channel in the embodiment of the present application. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0017] The present application embodiment provides a multi-node dynamic power line channel simulation system, see Figure 1 As shown, the multi-node dynamic power line channel simulation system provided by the embodiment of the present application includes an on-site grid-end channel characteristic acquisition system and a laboratory-end communication simulation system; the on-site grid-end channel characteristic acquisition system includes power line channel characteristic collectors deployed respectively at multiple on-site communication location nodes, each power line channel characteristic collector includes an excitation signal sending module and an excitation signal receiving module, and a first filter is provided in the excitation signal receiving module; the laboratory-end communication simulation system includes a communication simulation device, and multiple second filters are deployed on the FPGA in the communication simulation device, each second filter corresponds one-to-one to the power line channel from the first power line channel characteristic collector to the second power line channel characteristic collector, and the first filter and the second filter are both FIR (Finite Impulse Response, finite impulse response) filters; the first power line channel characteristic collector is a power line channel characteristic collector deployed at one of the on-site communication location nodes, and the second power line channel characteristic collector is a power line channel characteristic collector deployed at other on-site communication location nodes except the on-site communication location node where the first power line channel characteristic collector is located; wherein, Figure 1 Taking only four on-site communication location nodes as an example, in the embodiment of the present application, the number of on-site communication location nodes can be any number; A first power line channel characteristic collector, configured to periodically send an original excitation signal to the power line channel via an excitation signal sending module; A second power line channel characteristic collector is configured to, through the excitation signal receiving module, adjust the initial filter coefficient of the first filter to the current filter coefficient based on the actual received signal each time the original excitation signal transmitted through the power line channel is received, collect the current filter coefficient of the first filter, and transmit the current filter coefficient to the communication simulation device; wherein the current filter coefficient is used to characterize the response characteristics of the power line channel from the first power line channel characteristic collector to the second power line channel characteristic collector to the original excitation signal; A communication simulation device is used to receive the current filter coefficients transmitted by the second power line channel characteristic collector, and configure the current filter coefficients into the target filter for communication simulation; wherein the target filter is the second filter corresponding to the power line channel from the first power line channel characteristic collector to the second power line channel characteristic collector.

[0018] In an embodiment of the present application, a power line channel characteristic collector is provided on each field communication location node in the field grid end channel characteristic acquisition system, so that each field communication location node in the field grid end channel characteristic acquisition system can use the power line channel characteristic collector to realize the function of sending and receiving the excitation signal, so that the first power line channel characteristic collector for sending the original excitation signal and the second power line channel characteristic collector for receiving the original excitation signal can be configured by the host computer. For example, the power line channel characteristic collector on one of the field communication location nodes is configured as the first power line channel characteristic collector, and the power line channel characteristic collectors on other field communication location nodes are configured as the second power line channel characteristic collector, so as to realize the periodic acquisition of the power line channel characteristics from the first field communication location node to each second field communication location node. Specifically, one of the field communication location nodes The power line channel characteristic collector on the communication location node periodically sends the original excitation signal to the power line channel. The power line channel characteristic collectors on other field communication location nodes in each field communication location node iteratively update the first filter coefficient each time they receive the original excitation signal to obtain the current filter coefficient that characterizes the current power line channel characteristic. Then, the current filter coefficient is collected and transmitted to the communication simulation device. Then, through the periodic transmission and reception of the original excitation signal and the collection of the current filter coefficient, the dynamic capture of the channel characteristics that change with weather and load changes is achieved. Then, when the communication simulation device configures the current filter coefficient to the second filter corresponding to the power line channel from the first power line channel characteristic collector to the second power line channel characteristic collector through the filter coefficient configuration module for communication simulation, it can automatically track the true characteristics of the power line channel, thereby improving the authenticity and adaptability of the power line channel simulation.

[0019] In specific implementation, the excitation signal sending module in the power line channel characteristic collector can have a variety of specific structures to achieve its function. Figure 2 As shown, the excitation signal sending module may specifically include a signal generating unit and a sending processing unit; A signal generating unit, configured to generate an original excitation signal and output the original excitation signal to the sending processing unit and the first filter; The sending processing unit is used to send the original excitation signal to the power line channel.

[0020] In the embodiments of this application, see Figure 2 As shown, the signal generation unit includes a signal generator. The signal generator uses a pseudo-white noise generation algorithm, such as a random number generation algorithm, to generate pseudo-white noise, and outputs the pseudo-white noise as the original excitation signal to the transmission processing unit and the first filter. The transmission processing unit includes a digital-to-analog converter, a first filter amplifier, and a first coupler. The digital-to-analog converter performs analog processing on the original excitation signal. The first filter amplifier filters and amplifies the analog-processed original excitation signal. The first coupler couples the filtered and amplified original excitation signal to the power line. In this way, the signal generator, the digital-to-analog converter, the first filter amplifier, and the first coupler achieve the generation and transmission of the original excitation signal.

[0021] In specific implementation, the excitation signal receiving module in the power line channel characteristic collector can have a variety of specific structures to achieve its function. Figure 2 As shown, the excitation signal receiving module may specifically include a receiving processing unit and a dynamic adjustment unit, and the dynamic adjustment unit is provided with a first filter; a receiving processing unit, configured to receive an original excitation signal transmitted through a power line channel to obtain an actual receiving signal, and output the actual receiving signal to the dynamic adjustment unit; a first filter, configured to process the original excitation signal output by the signal generating unit based on the first filter coefficient to obtain a filtered output signal, and output the filtered output signal to the dynamic adjustment unit; wherein the first filter coefficient is an initial filter coefficient when the first filter coefficient is adjusted for the first time, and is a second filter coefficient obtained in a previous adjustment when the first filter coefficient is not adjusted for the first time; A dynamic adjustment unit is used to adjust the first filter coefficient by using a coefficient optimization algorithm based on the current error between the filtered output signal and the actual received signal to obtain the second filter coefficient when the target error function constructed based on the filtered output signal and the actual received signal is not lower than the error threshold; when the target error function constructed based on the filtered output signal and the actual received signal is lower than the error threshold, the second filter coefficient obtained by the last adjustment is determined as the current filter coefficient.

[0022] In an embodiment of the present application, the receiving processing unit includes a second coupler, a second filter amplifier and an analog-to-digital converter, and the dynamic adjustment unit includes a filter coefficient optimizer and a first filter; the second coupler extracts the original excitation signal from the power line channel; the second filter amplifier filters and amplifies the extracted original excitation signal; the analog-to-digital converter performs analog-to-digital conversion on the original excitation signal after filtering and amplification to obtain an actual received signal and outputs it to the filter coefficient optimizer; the first filter processes the original excitation signal generated by the signal generating unit based on the first filter coefficient to obtain a filtered output signal and output it to the filter coefficient optimizer; when the target error function constructed based on the filtered output signal and the actual received signal is not lower than the error threshold, the filter coefficient optimizer uses a coefficient optimization algorithm to adjust the first filter coefficient to obtain a second filter coefficient based on the current error between the filtered output signal and the actual received signal, and when the target error function constructed based on the filtered output signal and the actual received signal is lower than the error threshold, the second filter coefficient obtained by the last adjustment is determined as the current filter coefficient. In this way, the reception of the original excitation signal and the acquisition of the current filter coefficient are realized through the second coupler, the second filter amplifier, the analog-to-digital converter, the filter coefficient optimizer and the first filter.

[0023] In practical applications, in addition to outputting the original excitation signal to the transmission processing unit and the first filter, the signal generation unit also outputs the original excitation signal to the filter coefficient optimizer, so that when the target error function constructed based on the filtered output signal and the actual received signal is not lower than the error threshold, the filter coefficient optimizer uses a coefficient optimization algorithm to adjust the first filter coefficient based on the original excitation signal and the current instantaneous error between the filtered output signal and the actual received signal. Figure 3 As shown, when the target error function constructed based on the filtered output signal and the actual received signal is not lower than the error threshold, the filter coefficient optimizer uses a coefficient optimization algorithm to adjust the first filter coefficient based on the original excitation signal and the current instantaneous error between the filtered output signal and the actual received signal. Specifically, the original excitation signal y(n) is processed by the first filter and the filtered output signal is output. , x(n) is the actual received signal, the actual received signal x(n) is the same as the filtered output signal The instantaneous error between is recorded as e(n), and the goal of the coefficient optimization algorithm is to gradually adjust the first filter coefficient of the first filter so that the value of the target error function that measures the overall error is minimized, thereby obtaining the current filter coefficient. In the embodiment of the present application, the coefficient optimization algorithm can be but is not limited to the minimum mean square error (LMS) or recursive least squares (RLS) algorithm. For example, assuming that in the on-site power grid channel characteristic acquisition system, the original excitation signal is transmitted from the power line channel characteristic collector on the on-site communication location node A to the power line channel characteristic collector on the on-site communication location node B, the power line channel characteristic collector on the on-site communication location node A sends the original excitation signal y(n) to the power line channel, and the power line channel characteristic collector on the on-site communication location node B extracts, processes and converts the corresponding signal from the power line channel to obtain the actual received signal x(n), and processes the original excitation signal y(n) through the first filter to obtain the filtered output signal , based on the coefficient optimization algorithm, gradually reduce the filter output signal The overall error between the filter output signal and the actual received signal x(n) is calculated. As the overall error becomes smaller and smaller, the first filter coefficient of the first filter becomes closer and closer to the current power line channel characteristics of the power line channel from the on-site communication location node A to the on-site communication location node B. When the target error function constructed based on the filtered output signal and the actual received signal is lower than the error threshold, the current filter coefficient is obtained and transmitted to the communication simulation device for simulating the signal transmission from the on-site communication location node A to the on-site communication location node B; wherein the target error function is the weighted square sum of all instantaneous errors between the filtered output signal and the actual received signal. The coefficient optimization algorithm is briefly described below: Assume that the existing filter coefficients of the first filter (i.e., FIR filter) with an order of (M-1) are:

[0024] The excitation signal at the input of the first filter is:

[0025] The expected signal, that is, the actual received signal is x(n), then: 1) Constructing the objective function In order to measure the overall error between the filtered output signal and the actual received signal, the objective function is constructed based on a series of instantaneous errors as follows:

[0026] 2) Initialization The filter coefficient h is initialized to an all-zero vector; is the inverse covariance matrix of the excitation signal, initialized as ,in Is a small positive number, the value range can be arrive , I is an M×M identity matrix.

[0027] 3) Iterative Updates Each iterative update of the filter coefficients is performed in the following steps: First, calculate the instantaneous error:

[0028] Then, update the inverse covariance matrix of the excitation signal:

[0029] in, The forgetting factor is introduced to improve the adaptability of the algorithm, and its value range is ; N is the number of iterative updates; Finally, update the filter coefficients:

[0030] 4) End condition The direct termination condition of the iteration is that the objective function is lower than the error threshold. However, considering that the objective function includes all historical errors, which makes it difficult to calculate the objective function value, in this embodiment of the application, the second norm of the difference between the filter coefficients before and after the update is used to construct an indirect termination condition, which is expressed as:

[0031] That is to say, in one iteration, the two-norm of the difference between the filter coefficient h before and after the update is less than the preset convergence threshold (that is, the error threshold), the iteration is terminated, thereby obtaining the current filter coefficients of the first filter.

[0032] In specific implementation, data transmission between the power line channel characteristic collector and the communication simulation device at each on-site communication location node can be achieved in a variety of ways. Figure 2 As shown, the power line channel characteristic collector provided on each on-site communication location node further includes a wireless communication module; The wireless communication module is used to transmit the current filter coefficients to the communication analog device.

[0033] In the embodiment of the present application, the power line channel characteristic collector provided on each on-site communication location node can communicate directly with the communication simulation device through the wireless communication module, or can communicate indirectly with the communication simulation device through data transmission between the wireless communication module and the server. In other words, refer to Figure 1As shown, the multi-node dynamic power line channel simulation system provided by the embodiment of the present application may also include a server, and the power line channel characteristic collector on each on-site communication location node sends the current filter coefficient to the server through the wireless communication module, and the server forwards the current filter coefficient sent by the power line channel characteristic collector on each on-site communication location node to the communication simulation device. In this way, the transmission of the current filter coefficient from the on-site grid-end channel characteristic acquisition system to the laboratory-end communication simulation system is realized through the wireless communication module or the wireless communication module and the server. It is worth mentioning that the first configuration parameters for configuring the first power line channel characteristic collector and the second power line channel characteristic collector (for example, a certain power line channel characteristic collector is in the sending mode, and the other power line channel characteristic collectors are in the receiving mode), and the second configuration parameters for configuring the initial filter coefficient of the first filter and the initial excitation signal covariance inverse matrix (for example, the initial filter coefficient is an all-zero vector, and the initial excitation signal covariance inverse matrix is I), after the third configuration parameter for configuring the collection period (for example, collecting once every 1 minute) is configured in the host computer, it can be sent to the wireless communication module in the corresponding power line channel characteristic collector via the server for corresponding configuration, or directly sent to the wireless communication module in the corresponding power line channel characteristic collector for corresponding configuration.

[0034] For specific implementation, see Figure 2 As shown, the signal generation unit and dynamic adjustment unit, namely the signal generator, filter coefficient optimizer, and first filter, are deployed on an FPGA or SoC; the transmission processing unit and reception processing unit, namely the digital-to-analog converter, first filter amplifier, and first coupler, as well as the second coupler, second filter amplifier, and analog-to-digital converter, are integrated into the analog front-end circuit. In this way, through the signal generation unit and dynamic adjustment unit, as well as the transmission processing unit and reception processing unit, the modularization of the power line channel characteristic collector can be achieved while achieving stable signal transmission and efficient parameter collection.

[0035] In summary, in the embodiments of this application, refer to Figure 4As shown, a power line channel communication simulation of a power line carrier communication module that is expected to be deployed on four on-site communication location nodes is taken as an example. In the on-site grid-end channel characteristic acquisition system, the black solid line represents the power line, the black dotted line represents the wireless communication connection (such as 4G communication), and nodes A, B, C, and D represent the location nodes where the power line carrier communication module is expected to be deployed, that is, the on-site communication location nodes. A power line channel characteristic collector is deployed on each on-site communication location node, and each power line channel characteristic collector is provided with a first filter; in the laboratory-end communication simulation system, nodes A, B, C, and D represent the power line carrier communication module that is expected to be deployed on the on-site communication location node, and each power line carrier communication module is connected to the communication simulation device, and the communication simulation device is provided with a filter coefficient configuration module and an analog front-end circuit, wherein the analog front-end circuit has the same structure and function as the analog front-end circuit in the power line channel characteristic collector mentioned above, which will not be repeated here. The communication simulation device is also provided with a network consisting of 12 second filters, see Figure 5 As shown, H represents the second filter, tx represents the data input port connected to the sending node of the power line carrier communication module, rx represents the data output port connected to the receiving node of the power line carrier communication module, and the second filter corresponds one-to-one to the power line channel from one power line channel characteristic collector to another power line channel characteristic collector. During the entire test phase, since a power line channel characteristic collector is deployed on each on-site communication location node, debugging only needs to be completed in the laboratory-side communication simulation system, and there is no need for frequent on-site debugging, thereby improving the convenience of power line channel debugging. After the test is completed, the power line channel characteristic collector deployed on the on-site communication location node can be replaced with the corresponding power line carrier communication module, thereby completing the actual deployment of the power line carrier communication module. Among them, the current filter coefficient collected by the power line channel characteristic collector is uploaded to the server via wireless communication, and the server forwards the current filter coefficient to the communication simulation device. The communication simulation device updates the current filter coefficient to the corresponding second filter in the communication simulation device through the filter coefficient configuration module to perform power line channel simulation. It specifically includes the following two parts: (1) On-site power grid part (also known as the power line channel characteristics acquisition system part): If the power line channel characteristics from field communication location node A to field communication location node B are to be detected, the power line channel characteristics collector on field communication location node A sends an original excitation signal (such as white noise) to the power line channel. At the same time, the power line channel characteristics collector on field communication location node B uses a coefficient optimization algorithm such as RLS and LMS to gradually adjust the first filter coefficient of the first filter based on the actual received signal and the filtered output signal processed by the first filter to obtain the second filter coefficient. When the overall error between the actual received signal and the filtered output signal is minimized, the second filter coefficient obtained by the last adjustment is used as the current filter coefficient. In addition, to ensure that all frequency responses are uniformly learned, white noise (white noise has a uniform power spectral density) is used as the original excitation signal. After the filter coefficient adjustment is completed, the power line channel characteristics collector on field communication location node B obtains the current filter coefficient of the power line channel from field communication location node A to field communication location node B. The next step is to transmit the current filter coefficients of the power line channels between all the field communication location nodes from field communication location node B to field communication location node A, from field communication location node A to field communication location node C, from field communication location node C to field communication location node A... until the current filter coefficients of the power line channels between all the field communication location nodes are obtained, wherein the current filter coefficients are uploaded to the server via wireless communication.

[0036] (2) Laboratory part (also known as communication simulation system part): Each power line carrier communication module is directly connected to the communication simulation device. The communication simulation device continuously receives the current filter coefficients from the server and configures them into the corresponding second filter for communication simulation. For example, if the detection is of the power line channel characteristics from the on-site communication location node A to the on-site communication location node B, the current filter coefficients are configured to the second filter corresponding to the power line channel from the on-site communication location node A to the on-site communication location node B. The power line carrier communication module A deployed on the on-site communication location node A is expected to send a carrier data signal, which is converted into a digital signal through the analog front-end circuit in the communication simulation device, and then processed through the corresponding second filter in the communication simulation device. Finally, it is converted back into an analog signal through the analog front-end circuit in the communication simulation device, and finally reaches the power line carrier that is expected to be deployed on the on-site communication location node B. Communication module B, in this way, the real characteristics of the power line channel from the on-site communication position node A to the on-site communication position node B represented by the first filter in the on-site power grid-end channel characteristic acquisition system can be promptly reflected on the corresponding second filter in the communication simulation device in the laboratory-end communication simulation system, so that the distortion of the signal occurring during the propagation of the power line channel can be realized through the digital filter in the laboratory-end communication simulation system, and then the program downloading, debugging, problem locating and other operations of the power line carrier communication module can be completed in the laboratory-end communication simulation system. Compared with the traditional method of directly deploying the power line carrier communication module in the on-site power grid for program downloading, debugging, problem locating and other operations, this application is more convenient and quick, and greatly reduces the time cost and labor cost.

[0037] It should be noted that the above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit them. Although preferred embodiments of this application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they understand the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this application.

[0038] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include such modifications and variations.

Claims

1. A multi-node dynamic power line channel simulation system, characterized in that: It includes an on-site grid-end channel characteristic acquisition system and a laboratory-end communication simulation system; the on-site grid-end channel characteristic acquisition system includes power line channel characteristic collectors deployed respectively at multiple on-site communication location nodes, each of the power line channel characteristic collectors includes an excitation signal sending module and an excitation signal receiving module, and the excitation signal receiving module is provided with a first filter; the laboratory-end communication simulation system includes a communication simulation device, and the communication simulation device is provided with multiple second filters, each of the second filters corresponds one-to-one to a power line channel from the first power line channel characteristic collector to the second power line channel characteristic collector, the first power line channel characteristic collector is a power line channel characteristic collector deployed on one of the on-site communication location nodes, and the second power line channel characteristic collector is a power line channel characteristic collector deployed on other on-site communication location nodes except the on-site communication location node where the first power line channel characteristic collector is located; a first power line channel characteristic collector, configured to periodically send an original excitation signal to the power line channel via the excitation signal sending module; a second power line channel characteristic collector, configured to, through the excitation signal receiving module, adjust the initial filter coefficient of the first filter to a current filter coefficient based on an actual received signal each time the original excitation signal transmitted through the power line channel is received, collect the current filter coefficient of the first filter, and transmit the current filter coefficient to the communication simulation device; the current filter coefficient is used to characterize the current power line channel characteristics of the power line channel from the first power line channel characteristic collector to the second power line channel characteristic collector; The communication simulation device is used to receive the current filter coefficients transmitted by the second power line channel characteristic collector, and configure the current filter coefficients into the target filter for communication channel simulation; wherein, the target filter is the second filter corresponding to the power line channel from the first power line channel characteristic collector to the second power line channel characteristic collector.

2. The multi-node dynamic power line channel simulation system according to claim 1, wherein: The excitation signal sending module includes a signal generating unit and a sending processing unit; The signal generating unit is configured to generate the original excitation signal and output the original excitation signal to the sending processing unit and the first filter; The sending processing unit is used to send the original excitation signal to the power line channel.

3. The multi-node dynamic power line channel simulation system according to claim 2, wherein: The signal generating unit includes a signal generator; The signal generator is configured to generate pseudo white noise using a pseudo white noise generation algorithm, and output the pseudo white noise as the original excitation signal to the sending processing unit.

4. The multi-node dynamic power line channel simulation system according to claim 2, wherein: The transmission processing unit includes a digital-to-analog converter, a first filter amplifier and a first coupler; The digital-to-analog converter is used to perform digital-to-analog conversion on the original excitation signal; The first filter amplifier is used to filter and amplify the original excitation signal after digital-to-analog conversion; The first coupler is used to couple the original excitation signal after filtering and amplification to the power line.

5. The multi-node dynamic power line channel simulation system according to claim 2, wherein: The excitation signal receiving module includes a receiving processing unit and a dynamic adjustment unit, and the dynamic adjustment unit is provided with the first filter; The receiving and processing unit is configured to receive and process the original excitation signal transmitted through the power line channel to obtain an actual receiving signal, and output the actual receiving signal to the dynamic adjustment unit; The first filter is configured to process the original excitation signal output by the signal generating unit based on a first filter coefficient to obtain a filtered output signal, and output the filtered output signal to the dynamic adjustment unit; wherein the first filter coefficient is an initial filter coefficient when the first adjustment is made, and is a second filter coefficient obtained during a previous adjustment when the first adjustment is not made; The dynamic adjustment unit is used to adjust the first filter coefficient by using a coefficient optimization algorithm based on the current error between the filtered output signal and the actual received signal to obtain the second filter coefficient when the target error function constructed based on the filtered output signal and the actual received signal is not lower than the error threshold; when the target error function constructed based on the filtered output signal and the actual received signal is lower than the error threshold, determine the second filter coefficient obtained by the last adjustment as the current filter coefficient.

6. The multi-node dynamic power line channel simulation system according to claim 5, characterized in that: The receiving processing unit includes a second coupler, a second filter amplifier and an analog-to-digital converter; The second coupler is used to extract the original excitation signal from the power line channel; The second filter amplifier is used to filter and amplify the extracted original excitation signal; The analog-to-digital converter is used to perform analog-to-digital conversion on the original excitation signal after filtering and amplification to obtain the actual received signal, and output it to the dynamic adjustment unit.

7. The multi-node dynamic power line channel simulation system according to claim 5, characterized in that: The signal generating unit and the dynamic adjusting unit are deployed on FPGA or SoC.

8. The multi-node dynamic power line channel simulation system according to claim 5, characterized in that: The sending processing unit and the receiving processing unit are integrated on an analog front-end circuit.

9. The multi-node dynamic power line channel simulation system according to claim 1, wherein: Each of the power line channel characteristic collectors further includes a wireless communication module; The wireless communication module is used to transmit the current filter coefficient to the communication simulation device.

10. The multi-node dynamic power line channel simulation system according to any one of claims 1 to 9, characterized in that: Also includes servers; The server is used to forward the communication data between the communication simulation device and each of the power line channel characteristic collectors; wherein the communication data includes current filter coefficients or user configuration parameters.

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