480results about "Transmission control/equlisation" patented technology

The invention relates to the technical field of communication engineering, and discloses a power line carrier and wireless dual-mode fusion optimized communication method, which comprises the following steps of: 1, acquiring signal quality, noise and delay data of a power line and a wireless link in real time, and constructing a prediction model by utilizing historical data; step 2, dynamically adjusting a judgment threshold value of link switching in real time based on the prediction model, and ensuring that switching is triggered only when the signal change exceeds a preset range; step 3, based on the dynamic threshold, combining multiple indexes of signal-to-noise ratio, delay, packet loss rate and network load; according to the method, the necessity of link switching can be more intelligently judged by dynamically adjusting the judgment threshold of link switching and adopting a fuzzy logic decision mechanism, frequent switching during tiny fluctuation of signals is avoided by dynamic threshold adjustment, and a fuzzy logic system integrates multiple factors, so that the decision is finer, and the reliability of link switching is improved. And unnecessary delay and resource waste are reduced, so that the stability of a communication system is improved.

The invention relates to the technical field of power line communication, and discloses a frame synchronization method and device for broadband power line communication, and the method comprises the steps: carrying out the symbolization cross-correlation operation of a received signal, and obtaining a cross-correlation result sequence; performing secondary autocorrelation analysis and accumulation processing on the cross-correlation values in the sequence to generate an autocorrelation accumulated value sequence; screening candidate peak positions according to absolute values of the self-correlation accumulated values; defining a synchronous peak analysis window around the candidate peak position, and setting a noise reference window in an area far away from the window; verifying the validity of the candidate peak based on the difference between the autocorrelation accumulated values of the synchronization peak window and the noise reference window; and if the verification is valid, calculating and determining a final synchronization position through a mean value of a plurality of peak value positions in the synchronization peak window. According to the method, the problem of inaccurate synchronization peak positioning under the multipath effect and noise interference in the existing method is solved through the self-correlation accumulation and noise separation mechanism, and the reliability of frame synchronization is improved.

The invention discloses a power line carrier signal synchronization method and device, and belongs to the technical field of power line carrier communication. The method comprises the following steps: under the condition that a signal sequence is received, determining an autocorrelation result based on a known signal sequence; under the condition that the self-correlation result exceeds a dynamic threshold value, determining an effective correlation peak; the dynamic threshold is dynamically updated along with the change trend of the plurality of self-correlation results; and starting signal synchronization under the condition that the effective correlation peak and the historical effective correlation peak form a continuous correlation peak. According to the invention, through combination of cross-correlation and self-correlation, accurate detection of effective correlation peaks is realized, a dynamic threshold and continuity verification mechanism is introduced, the accuracy and robustness of signal synchronization are improved, the synchronization misjudgment rate can be significantly reduced, and the synchronization efficiency is improved.

The invention discloses an HPLCamp (High Performance Liquid Chromatography) based on deep learning. The invention discloses an HRF dual-mode communication adaptive coding modulation and anti-noise method. The method comprises the following steps: acquiring an optical radio frequency signal amplitude-phase change rate and synchronously sampling and normalizing; calculating a node amplitude-phase residual error to generate a nonlinear mapping coefficient; monitoring coherent change to solve a drift trend, adjusting a modulation coding optimization scheme, compensating distortion and outputting an anti-noise result. According to the method, the instantaneous amplitude and phase of the optical radio frequency dual-mode signal are extracted, a multi-dimensional amplitude-phase characteristic matrix is formed in combination with time domain synchronization and a normalization template, differential residual modeling and nonlinear mapping coefficient calculation are carried out between impedance nodes, and dynamic compensation of amplitude-phase mismatch and envelope offset is achieved. A drift trend quantity is generated based on coherent offset parameter differentiation, feedback is provided for modulation format and coding strategy optimization, amplitude equalization and phase correction are completed, the signal synchronization degree and amplitude-phase consistency are improved, and the steady-state response and anti-disturbance performance of a transmission link are enhanced.

The invention discloses a network communication dynamic optimization method based on multi-module collaboration, and relates to the technical field of network communication, a dual-mode communication module is deployed at each network node, and the network communication dynamic optimization method comprises the following steps: each network node broadcasts own existence information and power line channel characteristics through an HPLC (High Performance Liquid Chromatography) channel of the dual-mode communication module; each network node scans surrounding wireless networks through an HRF channel of the dual-mode communication module and reports own wireless channel quality information to the gateway; the global state sensing module collects all information and constructs a global network view containing physical topology and a channel quality map. A dual-mode cooperation mechanism, a machine learning prediction model and a dynamic decision strategy can adapt to complex dynamic environments such as power line noise fluctuation and wireless interference change, and communication parameters can be autonomously optimized without manual intervention; and meanwhile, the modular design is convenient to expand to a multi-mode communication scene, and has a wide application prospect.

The invention relates to the technical field of intelligent power grid communication, and discloses an HPLC communication-oriented power topology adaptive reconstruction and energy consumption optimization control method, which comprises the following steps of: acquiring HPLC communication characteristic data of power network nodes in real time; constructing a dynamic spatio-temporal topological graph based on the communication feature data and predicting a future topological state; generating a communication power distribution and routing path joint optimization strategy by using a multi-target reinforcement learning algorithm in combination with the predicted future topology state and the real-time energy consumption parameter; verifying the electromagnetic compatibility and protocol compliance of the optimization strategy through a digital twin model, and generating a control instruction which can be executed by equipment; and the transmitting power and the communication route of the HPLC node are dynamically adjusted through the control instruction. According to the method, the communication quality stability and the energy efficiency level are improved, topology dynamic perception, multi-target collaborative optimization and strategy security verification are realized, and efficient and reliable operation of HPLC communication in a complex power grid environment is guaranteed.

The invention provides an alternating current charging pile power line carrier control method, a medium and a system, and belongs to the technical field of alternating current charging piles. Real-time channel characteristic detection is carried out on a charging pile power line to obtain dynamic channel state parameters, forward error correction coding processing is carried out on a charging pile control instruction to obtain a coded carrier data frame, and the coded carrier data frame is sent to the medium; a double-layer coupling game control model is utilized to calculate transmission parameters, coupling optimization of upper and lower game models is realized through a grey wolf optimization game algorithm to obtain an optimal carrier transmission parameter set, and working parameters of a power line carrier transmitter of the charging pile are adjusted according to the optimal parameter set to realize carrier communication. And meanwhile, a comprehensive evaluation index output by the carrier parameter dynamic adjustment function is fed back to the double-layer coupling game control model to form closed-loop iterative optimization, so that the technical problem that carrier communication parameters cannot be adaptively adjusted in real time due to dynamic change of power line channel characteristics along with factors such as load change and switching operation is solved.

The invention discloses a power line carrier signal synchronization method and device based on an OFDMA system, and belongs to the technical field of power line carrier communication. The method comprises the following steps: performing cross-correlation processing on a received signal and a reference sequence to obtain a target cross-correlation result, and performing self-correlation operation on the target cross-correlation result and a target historical cross-correlation result to obtain a target self-correlation result; analyzing the position of a first target autocorrelation peak in the received signal based on the target autocorrelation result; the first target autocorrelation peak is the autocorrelation peak with the maximum peak value in the received signal; determining a first window including the first target autocorrelation peak according to the position of the first target autocorrelation peak; and determining the position of a synchronization peak in the received signal based on the position of the autocorrelation peak in the first window. According to the invention, the autocorrelation peak is determined by combining cross-correlation and autocorrelation, and the position of the synchronization peak is determined by integrating the position of the autocorrelation peak in the first window, so that the accuracy of signal synchronization is improved.

The invention relates to the technical field of frequency band detection, in particular to a broadband power line carrier communication frequency band detection method and a broadband power line carrier communication frequency band detection system. According to the difference between energy corresponding to each peak value in the modal component and the peak width ratio of each peak value, obtaining a characteristic value of the modal component influenced by interference, and according to the difference between the frequency range of the modal component and the frequency range of energy change, obtaining the interference degree of each modal component, and obtaining a signal adjustment coefficient to adjust a wavelet threshold value; and analyzing the difference between the signal-to-noise ratios of the filtered modal components, reconstructing the modal components, and obtaining the working frequency band of the power line carrier communication signal according to the similarity between the reconstructed signals and the standard signals of the frequency bands corresponding to the modal components in combination with the bit error rate of the frequency bands. According to the invention, more accurate broadband power line carrier communication frequency band detection can be realized.

The invention relates to the technical field of Internet of Things electric power communication, and discloses a remote software upgrading method and system based on an HPLC high-speed power line carrier network. The remote software upgrading method is applied to software upgrading equipment, and specifically comprises the following steps that S101, a master control node of software to be upgraded is obtained, the master control node completes encryption of an upgrading instruction packet through HPLC network broadcasting, if the master control node is in an offline state, a response is triggered through a wake-up pulse signal synchronized with a power line power frequency period, and if the master control node is not in the offline state, the software to be upgraded is upgraded; and it is ensured that the whole network nodes complete instruction synchronization within the preset time. Omnibearing upgrading and optimization are achieved through three core technologies of dynamic fragmentation transmission, millisecond-level service continuity guarantee and resource limit adaptation, the packet loss rate of a high-noise environment is compressed to 0.1% based on a signal-to-noise ratio self-adaptive fragmentation strategy (128KB-512KB), the average transmission time is reduced to 17.4 minutes from 30 minutes in combination with a multi-path concurrent transmission and breakpoint resume protocol, and the transmission efficiency is improved. And 300ms whole-network instruction synchronization is realized with the assistance of a power frequency synchronization wake-up mechanism.

A communication method and apparatus, which relate to the technical field of communications. By means of the communication method and apparatus, different preamble lengths and slots can be allocated to an electric meter, thereby improving the communication efficiency. The method comprises: a central coordinator receiving channel quality information between nodes in each node group among a plurality of node groups; the central coordinator determining a preamble length on the basis of the channel quality information; the central coordinator sending first indication information and second indication information, wherein the first indication information is used for indicating a preamble length of a frame sent by a node in each node group among the plurality of node groups, and the second indication information is used for indicating a slot of the frame sent by the node in the node group; and an electric meter receiving the first indication information and the second indication information, and sending a frame on the basis of the preamble length indicated by the first indication information and the slot indicated by the second indication information.

A CAN transmitter includes an output branch, a replica branch including a replica of the output branch, and a feedback network. The output branch includes a first resistive element controlled by a first bias voltage and a second resistive element controlled by a second bias voltage. The replica branch has a feedback node that is replicated at a midpoint between the CANH bus terminal and the CANL bus terminal. The feedback network has a first input coupled to the feedback node, a second input configured to receive a midpoint reference voltage indicative of a desired midpoint voltage between the CANH and CANL terminals, and an output at which the first bias voltage is provided. A resistance controller is coupled to a control terminal of the second resistive element and configured to generate the second bias voltage based on a predetermined reference voltage and a bias current.

The invention discloses a low-voltage power line carrier communication method and system based on multi-band cooperative modulation, and relates to the technical field of carrier communication, and the method comprises the steps: obtaining channel state information and service type information; constructing a channel power model according to the channel state information and performing calculation to obtain a transmitting power distribution value of a frequency band; performing preliminary allocation on frequency bands based on the service type information and the transmitting power allocation value to obtain a first frequency band allocation strategy; and optimizing the first frequency band allocation strategy to obtain a second frequency band allocation strategy, thereby realizing low-voltage power line carrier communication based on multi-frequency-band cooperative modulation. According to the method, the communication reliability of the system in a high-noise and strong-interference environment is improved, the service quality assurance capability for services with different priorities is enhanced, dynamic optimization and balanced utilization of spectrum resources are realized, and an efficient and reliable communication solution is provided for application scenes such as a smart power grid and smart home.

Disclosed in the present application are a communication method and a communication apparatus. The method comprises: in a power line carrier communication system, dynamically dividing the whole frequency band into a plurality of sub-frequency bands, performing channel quality estimation on each sub-frequency band by using a measurement frame to obtain an actual channel condition of each sub-frequency band, and selecting, on the basis of the actual channel condition of each sub-frequency band, a sub-frequency band with a better quality to send data. A carrier shielding table can also be determined on the basis of the actual channel condition of each sub-carrier. By applying the method described in the present application, in the process of sending and receiving data, frequency band selection is flexible, and the efficiency of data transmission is improved; moreover, by using a carrier shielding table, a sub-carrier with a poor channel quality is not selected to send and receive data, so that power is concentrated on an effective sub-carrier (equivalent to an unshielded sub-carrier), and the communication performance is improved.

The invention relates to the technical field of data lines, and particularly discloses a data line system and a data line for intelligently switching data transmission and charging, and the system comprises a dual-core synchronization management module which is used for enabling dual cores to enter an initial detection state through encryption synchronization signaling when equipment is connected; the asynchronous signal processing module is used for generating state judgment parameters through multi-scale sliding window processing and time-frequency domain feature fusion; the consensus decision arbitration module outputs a backtracking trigger signal through dynamic projection transformation and self-adaptive threshold comparison; the state backtracking recovery module is used for generating a retry instruction with a random delay period based on the historical backtracking success rate and the signal quality evaluation; the safety mode control module is used for identifying dominant features by analyzing historical failure records and switching to a safety operation mode; through distributed dual-core cooperative processing and an intelligent fault recovery mechanism, the technical problems of confusion of protocol stacks and deadlock of a state machine in a complex electromagnetic environment are solved, and the anti-interference capability and reliability of the system are improved.

The invention provides an electric energy quality treatment method, system and device based on a charging pile and a medium, and belongs to the technical field of charging piles, and the method is realized through the following steps: employing a mutual inductor to collect three-phase voltage / current; a common analog sampling and DSP processing circuit; harmonic / reactive power is identified based on the instantaneous reactive power theory, and a compensation instruction is generated; according to the compensation control instruction, driving an active filtering inverter circuit to inject compensation current into a power grid so as to reduce the total harmonic current content and improve the power factor; and the main controller generates charging state data according to the sampled voltage signal and current signal, and couples the data to an alternating current power line for transmission through the power line carrier communication module. The system guarantees the quality of the power grid, achieves the high efficiency and reliability of the operation of the charging pile, and gives consideration to the safety of the power grid and user experience.

The invention provides a self-adaptive frequency adjustment method, medium and system for an ammeter carrier communication module, and belongs to the technical field of intelligent ammeters, and the method comprises the steps: firstly obtaining and sampling a power line carrier communication signal, obtaining communication time distribution characteristics within 24 hours through time domain analysis, and carrying out frequency domain analysis to obtain noise spectrum characteristics; and establishing a time-frequency characteristic incidence matrix. 24 hours are divided into a plurality of transmission time windows based on the matrix, and the optimal frequency range of each window is determined and sub-band division is carried out. And performing channel quality evaluation on the sub-bands, substituting evaluation data into the noise characteristic equation set, solving to obtain a channel transmission characteristic curve, and selecting an optimal transmission sub-band for communication according to the channel transmission characteristic curve. The system monitors communication quality in real time, and performs time-frequency characteristic analysis and optimal sub-band selection again when a quality parameter is lower than a threshold value, so that adaptive frequency adjustment is realized, and the problem that current electric meter carrier communication is difficult to adapt to a complex power line channel environment is solved.

The invention discloses a cable tunnel intelligent communication transmission system and method based on artificial intelligence, and relates to the technical field of intelligent communication.The method comprises the steps that S10, an energy information master station is installed at an entrance of a cable tunnel, an optical cable is welded into the energy information master station, one end of the optical cable extends out of an energy information master station case, and the energy information master station case is connected with the optical cable along the cable; laying the integrated optical cable embedded with the wireless access node above an optical cable bridge in the cable tunnel; s20, determining an abnormal position existing in each cable division section; s30, predicting an abnormal coefficient of each cable division section; and S40, intelligently generating a communication transmission optimization strategy of each cable division section. According to the method, the sound intensity value, the abnormal current value and the abnormal voltage value are selected according to the condition that the abnormal position exists in each cable division section, the influence of other interference abnormal values on the prediction result can be eliminated, and the prediction precision is further improved.

The invention discloses a multi-thread-driven communication centralized control method and system and electronic equipment, and relates to the related field of carrier transmission, and the method comprises the steps: receiving a communication instruction; task thread distribution and task queuing are carried out according to the communication content, the communication area and the priority information, and a communication sound source signal is generated according to the communication area and the communication content; when the task thread is obtained to execute the scheduling instruction, the communication sound source signal is subjected to power amplification processing, the communication sound source signal and a control signal are synchronously injected into a communication line through a carrier host, and the communication sound source signal and the control signal are transmitted in a common-cable carrier mode; and the communication terminal receives the co-cable signal, separates a communication audio and a control instruction from the co-cable signal, and performs communication terminal control and communication content broadcasting. The technical problems that task scheduling is disordered, signal transmission is unstable and terminal control is inaccurate in an existing communication centralized control method are solved, and the technical effects of efficient parallel processing of multiple tasks, high-quality and stable transmission of communication signals and accurate control of communication terminals are achieved.

The invention relates to a discrete distributed load driving system and method, computer equipment and a storage medium. The method comprises the steps that S1, a master control module generates an ordered 0th data packet according to a physical connection sequence of driving modules; s2, the main control module sends the 0th data packet to a first driving module of a one-way data path; s3, the mth driving module receives and analyzes the (m-1) th data packet sent by the upstream to obtain the mth control instruction; s4, the mth driving module drives a load connected with the mth driving module according to the mth control instruction; and S5, the mth driving module cuts off the first sub-data frame from the (m-1) th data packet and repacks the (m-1) th data packet to generate an mth data packet, and sends the mth data packet to a downstream (m + 1) th driving module. The method and the device have the effect of reducing deployment and maintenance cost during large-scale load control.

The invention relates to a narrow-band interference filtering method and device based on an HPLC (High Performance Liquid Chromatography) chip, and belongs to the technical field of power line carrier communication. When pulse processing is carried out on a signal, AGC / DAGC processing is paused if a narrowband interference detection starting signal is detected, a narrowband interference detection module calculates a narrowband interference frequency point by using the signal of which the AGC / DAGC processing is paused, and a filter coefficient used by a narrowband interference elimination module is determined based on the narrowband interference frequency point; and the narrowband interference elimination module carries out narrowband interference elimination processing according to the determined filter coefficient. Wherein the AGC / DAGC processed signal is paused when the signal participating in the calculation of the narrowband interference frequency point is subjected to pulse processing, so that signal fluctuation caused by AGC / DAGC processing is avoided, the calculation accuracy of the narrowband interference frequency point is improved, and the narrowband interference filtering effect is ensured.

The invention relates to a transmission rate optimization method, device and equipment for a passive copper cable, and the method comprises the steps: obtaining physical characteristic parameters of the passive copper cable, and carrying out the performance evaluation, and obtaining reference transmission parameters; acquiring a transmission signal of the passive copper cable, and performing modulation optimization on the transmission signal and the reference transmission parameter to obtain an optimized transmission signal; obtaining interference characteristic data of the passive copper cable, and performing interference analysis on the optimized transmission signal to obtain an interference elimination result; performing rate evaluation analysis on the optimized transmission signal and the interference elimination result to obtain an initial rate parameter; performing trend analysis on the attenuation characteristic information based on the interference elimination result to obtain a rate attenuation prediction result; and performing rate optimization on the transmission signal according to the initial rate parameter and the rate attenuation prediction result to obtain a global optimization signal. According to the invention, various interferences in the transmission process can be effectively identified and eliminated.

The present application relates to the technical field of power communication of Internet of Things, and discloses a remote software upgrading method and system based on HPLC high-speed power line carrier network; the remote software upgrading method is applied to a software upgrading device and specifically comprises the following steps: S101: obtaining a master node of software to be upgraded; the master node completes an encrypted upgrading instruction package through HPLC network broadcasting; if the master node is in an offline state, a response is triggered through a power line power frequency cycle synchronization wake-up pulse signal to ensure that all network nodes complete instruction synchronization within a preset time. The present application realizes all-around upgrading optimization through three core technologies of dynamic fragmentation transmission, millisecond-level service continuity guarantee and resource limit adaptation; an adaptive fragmentation strategy (128KB-512KB) based on a signal-to-noise ratio compresses a packet loss rate in a high-noise environment to 0.1%; combined with multi-path concurrent transmission and a breakpoint resume protocol, average transmission time is reduced from 30 minutes to 17.4 minutes; and a power frequency synchronization wake-up mechanism is used to realize 300ms network-wide instruction synchronization.

Provided in the present application are a communication method and apparatus, and a computer-readable storage medium. The communication method can be applied to power line communication, and comprises: a sending end receiving the number of bearable bits of each carrier from a receiving end, wherein the number of bearable bits of each carrier is determined on the basis of a signal-to-noise ratio (SNR) corresponding to each carrier; on the basis of the number of bearable bits of each carrier, the sending end performing repeated carrier mapping on data included in a data frame; and the sending end sending the data frame to the receiving end, the data frame comprising indication information, wherein the indication information indicates that the current data frame uses a repeated carrier mapping method of a first mode. The technical solution provided in the present application can improve the system throughput rate.

The invention discloses a wireless signal synchronization method and device for a dual-mode carrier communication system and electronic equipment, and belongs to the technical field of power line carrier communication. The method comprises the following steps: receiving a wireless signal frame, extracting frame data matched with a predefined scrambling sequence length based on a sampling point position of the wireless signal frame, and dividing the frame data into a plurality of groups of data; performing descrambling processing on each group of data according to the scrambling sequence to obtain multiple groups of descrambling data; according to preset autocorrelation times, carrying out autocorrelation calculation on the multiple groups of descrambling code data to obtain multiple autocorrelation results; and superposing the plurality of self-correlation results to obtain a superposition result, and determining the frame synchronization position of the wireless signal frame based on the superposition result. According to the invention, the synchronization effect of wireless signals is improved, so that high-quality wireless signal transmission is realized.

The invention relates to the technical field of circuit fault processing, and discloses an automatic identification and remote isolation method for a fault section of a low-voltage distribution line, and the method comprises the steps: building a reference fingerprint database based on channel state information through a central coordination node; monitoring real-time channel frequency response and executing threshold comparison to judge suspected fault points; triggering an active impedance control unit of the terminal agent node to execute controlled perturbation; a transmission line network model is used for calculating a theoretical transmission function variable quantity, fitting analysis is carried out on the theoretical transmission function variable quantity and a measured value, and a physical fault is judged and load interference is stripped through a normalized residual coefficient; calculating a residual drift distance between adjacent nodes based on the topological mapping table to execute differential positioning so as to lock a fault physical interval; and issuing a tripping message, and driving the circuit breaker to execute physical isolation at the power frequency zero crossing point. According to the scheme, on-line fault identification and isolation are realized through active impedance perturbation and distributed residual analysis, and the robustness of fault judgment in a complex load environment is improved.

According to the dual-mode direct-connection networking method and system for the terminal and the electric energy meter, the electronic equipment and the storage medium, provided by the invention, the method comprises the following steps: evaluating a terminal side service adaptive link, converting an industrial standard into a quantitative link quality value, dynamically adjusting a link evaluation index weight and a terminal dominant shunting strategy, avoiding master station scheduling time delay, and improving the efficiency of the terminal and the electric energy meter. In a direct connection scene, a metering data acquisition period and a control instruction time delay are ensured to meet index requirements, terminal-ammeter collaborative predictive self-healing, fusion of working conditions and other information are used for predicting link quality and judging the risk of link transmission, and when a fault is triggered, the data when the fault occurs is complementarily transmitted by switching the link, so that the integrity of the data is ensured, and the data transmission efficiency is improved. The link failure reason is traced in combination with the working condition, and the link is repaired according to the tracing result, so that the link repairing speed can be increased, a prediction-self-healing-fault-repairing-optimization complete closed loop is formed, and the reliability and accuracy of long-term operation of the scheme are ensured.

The invention discloses an efficient data transmission method for HPLC (High Performance Liquid Chromatography) dual-mode communication, relates to the technical field of data transmission, and solves the problems that when low-priority tasks are congested, an undifferentiated transfer strategy is adopted, task importance grading is not considered, and transmission of important low-priority tasks is interrupted; in order to solve the technical problem that congestion is difficult to relieve due to lack of dynamic monitoring and feedback after transfer, the method comprises the following steps of: finely dividing task priorities; a high-priority task adopts a dual-mode parallel transmission and first arrival effective mechanism, so that the transmission success rate is improved; low-priority tasks are scheduled in a hierarchical manner according to secondary priorities, the resource utilization rate is improved, the transmission interruption rate of the important low-priority tasks is reduced by quantifying the secondary priorities of the low-priority tasks, adopting a hierarchical transfer strategy and combining dynamic monitoring and feedback, and a time slot and bandwidth cooperative adjustment mechanism of HPLC and HRF is established; smooth bandwidth transition is realized through dynamic subcarrier binding and hybrid modulation, and resource waste is avoided in combination with global resource pool management.

The invention provides an intelligent electric meter interaction method and system based on dual-mode heterogeneous network communication, belongs to the field of power line carrier communication, and solves the problem of communication stability still existing in intelligent electric meter interaction under a dual-mode communication architecture. The method comprises the following steps: under the condition that a link layer of a high-speed power line carrier communication channel detects that a subcarrier-level bit error rate or a pilot signal-to-noise ratio has narrowband abnormality and lasts for a preset number of message periods, loading the link layer of the high-speed power line carrier communication channel through programmable impedance in a maintenance time slot, pilot frequency receiving results are collected under the disturbance condition and the non-disturbance condition, and a reflection mark memory function is formed; the reflection mark memory function obtained by maintaining the time slot each time is extracted and stored, a historical record is formed, and the historical record comprises channel frequency domain reflection coefficient changes and a group delay sequence; and identifying the arrival time of the main reflection component based on historical records, and converting the arrival time of the main reflection component into a suspected abnormal position interval.

The invention discloses a low-voltage power line power frequency communication interference suppression and adaptive demodulation method and system, and the method comprises the steps: firstly, detecting the voltage zero crossing of a power grid in real time, and dynamically calibrating a communication time slot based on an actually measured power frequency, thereby achieving the precise power frequency synchronization; injecting a pilot signal into the synchronous time slot window, and judging line topology mutation through coupling of pilot response and a preset signal-to-noise ratio threshold, thereby completing topology perception and verification; triggering channel reestimation in combination with a topological change result, rejecting fundamental wave and multi-order harmonic interference from channel response of least square estimation, and updating a channel model by adopting a time-varying smoothing algorithm; then, a low-noise time window is determined according to the corrected zero cross point, key data packets are scheduled preferentially, and high-reliability anti-interference transmission is achieved; and finally, dynamically and cooperatively adjusting the transmitting power, the receiving filter and the phase compensation based on the newest channel and topology state to form closed-loop self-adaption. According to the scheme, the intelligent degree is high, and the communication stability and the system maintainability are greatly improved.