394 results about "Power-line communication" patented technology

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.

Disclosed are a power line communication method and apparatus, comprising: a first device generating a physical layer protocol data unit (PPDU) frame, the PPDU frame comprising a frame control field, a training symbol field, and a load symbol field, the load symbol field being used for modulating and transmitting a load symbol, the training symbol field being used for bearing a training symbol, and the load symbol field being used for receiving the training symbol; the training symbol field is used for channel estimation of multiple input multiple output (MIMO) and extended bandwidth, the frame control field comprises a variable region field, the variable region field comprises a frame identification field and a frequency band field, the frame identification field is used for indicating a frame type of a frame start (SOF) frame included in the PPDU frame, and the frequency band field is used for indicating an available frequency band of a training symbol and a load symbol; and the first device sends the PPDU frame to the second device. According to the embodiment of the invention, through the redefined PPDU frame, the power line communication supports the characteristics of MIMO, large bandwidth and the like, so that the overall network performance is improved.

The invention relates to the technical field of power line communication, in particular to a signal noise reduction method and system for improving power line communication quality, and the method comprises the steps: carrying out the filtering of a power line communication signal at different synchronization lengths; analyzing the volatility of the local range of each power line communication signal value; comparing the distances between the original extreme value signal sequences before and after filtering to obtain a filtering effect of each power line communication signal value based on different synchronization lengths; obtaining a denoising selection weight of each power line communication signal value; based on the prediction result of the filtering weight of a preset number of signal values before each power line communication signal value, combining the signal distribution similarity in the window corresponding to the power line communication signal values and the denoising selection weight to obtain the filtering weight of each power line communication signal value, and weighting the filtered signals to obtain the power line communication signal value. And obtaining a final filtering value of each power line communication signal value. The invention aims to improve the de-noising quality of the power line communication signal.

A driveline and driveline system for an active implantable device provides for communication over the power conductors in the driveline. The driveline includes four conductors, two for the positive power connection and two for the negative power connection. Communication in the driveline is performed using Power Line Communication (PLC) technology on the four conductors, superimposing a communication signal on the conductors such that the four conductors provide both power and communication capability. The four conductors provide redundant paths for both power and communication, so the failure of one of the conductors in the driveline does not affect operation of the driveline. The four conductor driveline cable and system provides a more robust driveline cable that does not fail with the failure of one of the conductors without increasing the diameter of the driveline, which would increase the risk of infection where the driveline passes through the skin.

The invention discloses a distribution network power line anti-interference communication method based on adaptive filtering, and belongs to the technical field of distribution network power line communication. According to the method, a communication signal adopting a frequency shift keying modulation mode is acquired from a power line coupler of a distribution network through a signal acquisition module, the communication signal is preprocessed by using a digital signal processing unit, spectral analysis is performed on the preprocessed signal, and characteristic parameters of interference noise are extracted; a coefficient vector of a finite impulse response adaptive filter is initialized based on the characteristic parameters, the order of the filter is in direct proportion to the reciprocal of the dominant interference frequency, fine adjustment is carried out based on noise energy distribution through a table look-up method or a linear mapping relation, and the weight coefficient of the filter is adjusted in real time in the communication process. The adjustment step length is dynamically adjusted according to the real-time estimated signal-to-noise ratio, and finally, the processed signal is output through the adaptive filter and data demodulation is carried out. The method is mainly used for improving the anti-interference capability and the communication reliability of the power private line communication of the distribution network.

Method for detecting a state of a connection between an electrically driven motor vehicle (1) and a corresponding charging station, wherein the motor vehicle (1) has a “Control Pilot (CP)” function with a vehicle-side “Control Pilot (CP)” line (3), characterized in that a length of a “Control Pilot” line between the motor vehicle and the charging station is measured by means of a “Power Line Communication” (PLC) chip (4), wherein the length of the “Control Pilot” line between the vehicle and the charging station using signal reflection and signal attenuation or -runtime is measured, wherein the PLC chip (4) sends a signal along the CP line between the motor vehicle and the charging station and receives the signal reflected at the end of the CP line between the motor vehicle and the charging station and running back to the PLC chip (4), wherein the length of the path traversed by the signal is determined based on the signal runtime, wherein the length of the CP line between the motor vehicle and the charging station is clearly determined from the distance traveled by the signal and a specific cable type is determined based on the length of the CP line between the motor vehicle and the charging station.

The invention relates to an electric power communication system optimization technology, in particular to a physical layer security optimization method and equipment for a full-duplex multicarrier power line communication system, and the method combines a full-duplex technology and a time domain artificial noise auxiliary security strategy to construct a multicarrier power line communication system model with a relay; generating a safety rate maximization problem, designing a set of convex approximation method, and performing conversion and simplification of a non-convex optimization problem; designing an iterative solution algorithm, and jointly optimizing the confidential data of the source node, the confidential data of the relay node and the artificial noise power distribution matrix; and optimizing the physical layer safety performance of the full-duplex multi-carrier power line communication system based on the solved power distribution matrix. According to the communication scheme and the solved power distribution vector, the safety performance of the power line communication system is optimized, the limitation of the number of power transmission cables in the power line communication system is avoided, the safety rate maximization of the total transmitting power domain can be realized, and the technical problem that data in an existing multi-hop power line communication system is prone to leakage is solved.

The invention relates to the technical field of power line communication, in particular to a distributed power line communication data management system based on a block chain, in the invention, through innovative application of a convolutional neural network in an error repair module, accurate coding correction and rapid repair of error bits are realized, the integrity and effectiveness of data transmission are ensured, and the data transmission efficiency is improved. The method provides higher accuracy and adaptive capacity when reading and repairing bit streams bit by bit, deals with various error types in a complex communication environment, efficiently repairs error data packets in communication, and dynamically monitors and analyzes the signal-to-noise ratio and the error rate of a channel through the use of a finite-state machine, so that the error rate of the channel is effectively reduced, and the error rate of the channel is effectively reduced. The transmission strategy is adjusted in time when the channel state changes, so that the communication process is kept stable and efficient, the efficient transmission strategy is automatically generated according to the change of the channel state, the waste of channel resources is reduced, the bandwidth utilization rate is improved, and the data transmission failure caused by the unstable channel is avoided.

The invention relates to the technical field of power signals, in particular to a power line broadband carrier signal adaptive enhancement and noise reduction method and system. According to the method, the multi-dimensional interference characteristics of the power line transmission environment are acquired and the initial modulation parameters are pre-adjusted, so that the influence of environmental interference can be reduced at the initial stage of signal transmission, the signal transmission quality is improved, and the multi-path delay inequality of the aggregated signal and the channel attenuation coefficient are acquired in real time and are combined with dynamic channel adjustment, so that the signal transmission efficiency is improved. Signal components can be dynamically adjusted and optimized according to real-time changes of a power line channel, the adaptive capacity of a system is improved, signals can be optimized in real time by means of real-time transmission quality monitoring and optimization of enhanced carrier signals, the lagging influence of signal quality is avoided, and the system performance is improved. The method ensures that the power line communication system has good adaptive enhancement and noise reduction capabilities, improves the overall performance of the communication system, and can effectively overcome the influence of multipath effect, electromagnetic interference, attenuation and other factors on channel estimation in the prior art.

The invention relates to the technical field of communication, in particular to an intelligent selection and switching method and system for power line broadband carrier communication channels. According to the method, the multi-modal channel quality basic data including the signal quality modal data, the transmission performance modal data and the interference characteristic modal data are introduced, and a scoring mechanism of the signal stability, the transmission efficiency and the anti-interference capability is combined, so that the comprehensive evaluation precision of the power line communication channel quality is effectively improved; real-time communication state information of upstream and downstream equipment is dynamically obtained through a feedback link, a channel quality score is optimized and corrected, and a communication demand matching degree is comprehensively considered, so that the intelligence and the adaptive capability of channel selection and switching are further improved, and therefore, a comprehensive evaluation index of a communication channel can be monitored in real time, and the communication efficiency is improved. The optimal communication channel is automatically selected or switched according to the evaluation result, so that the stability of the communication quality and the transmission efficiency are ensured, and the reliability of the power line broadband carrier communication system is effectively improved.

The invention discloses a quaternary data processing system based on a multi-level signal and a dual-storage architecture, and relates to the technical field of data processing, in particular to a quaternary data processing system combining multi-level signal coding, a dual-storage architecture synchronization strategy and a quantum compatibility design. According to the system, through collaborative design of multi-level signals and a double-storage architecture, the density bottleneck and anti-interference shortages of a traditional binary system are solved, meanwhile, a classic data interface is provided for quantum calculation, and the system can be widely applied to the fields of power line communication, industrial automation, quantum calculation acceleration and the like.

Embodiments of the present application disclose a power line communication method and apparatus. The method comprises: a first device generates a physical layer protocol data unit (PPDU) frame, wherein the PPDU frame comprises a frame control field, a training symbol field, and a load symbol field, the load symbol field is used for modulating a transmission load symbol, the training symbol field is used for bearing a training symbol, the training symbol field is used for channel estimation of multiple-input multiple-output (MIMO) and of an extended bandwidth, the frame control field comprises a variable region field, the variable region field comprises a frame identification field and a frequency band field, the frame identification field is used for indicating a frame type of a start of frame (SOF) comprised in the PPDU frame, and the frequency band field is used for indicating an available frequency band of the training symbol and of the load symbol; and the first device sends the PPDU frame to a second device. By using the embodiments of the present application, the power line communication supports the characteristics of MIMO, large bandwidth and the like by means of a redefined PPDU frame, thereby improving the overall network performance.

The invention discloses a dual-mode communication power distribution method and a dual-mode communication power distribution system considering an asymmetric service threshold and a comprehensive utility, which can realize maximization of system channel capacity through a total dual-mode communication system, judgment of constraint conditions and constraint of whether maximum distribution power of a subcarrier is needed or not and optimization of an algorithm, and improve the performance of the system. The system performance is improved, the resource utilization efficiency is optimized, and the comprehensive effectiveness of the system is improved. Moreover, by setting different power distribution ratios of wireless communication and power line communication, the requirements of different dual-mode communication systems for power distribution of two communication modes can be met, and the power distribution ratio with the best optimization efficiency under the current condition can be given.

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.

A charging device is connected to an external device by a power line and charges an electric vehicle. The charging device includes: a communicator that obtains a connection notification signal from the electric vehicle by wired communication, the connection notification signal indicating that the electric vehicle and the charging device are connected; and a converter that converts the connection notification signal obtained into a signal format compliant with a communication standard of first power line communication performed over the power line to obtain a converted connection notification signal, and outputs the converted connection notification signal to the external device by the first power line communication. The wired communication is communication different from the first power line communication.

According to the novel transponder device and the method and device for achieving multiple functions through power line carrier communication, multiple functions such as train positioning and speed measurement, station track occupation recognition, train occupation and integrity check and train-ground communication are achieved through the novel transponder device and the power line carrier communication, and wireless communication technologies such as the power line carrier communication are integrated; the method can be applied to train operation control, train-ground coordination action, locomotive vehicle information management, unmanned stations and train state monitoring in various scenes, can simplify the types of equipment, reduces the construction cost and the maintenance workload, and improves the transportation efficiency and safety at the same time.

The invention provides an equipment network access method, which is applied to a central coordinator CCO, and comprises the following steps: broadcasting first identification information; the first identification information is identification information of a power line communication PLC network where the CCO is located; receiving first information sent by the station STA; the first information comprises second identification information, and the second identification information is target PLC network identification information of the STA; if the white list contains the identifier of the STA and the second identifier information is the same as the first identifier information, sending second information to the STA; the second information is used for indicating that the STA successfully joins the PLC network where the CCO is located. Through the equipment network access method, the problem of wrong network access of the STA can be prevented.

The invention relates to the technical field of transformers, in particular to a signal transformer for multi-path signal coupling of a low-voltage power grid, the signal transformer comprises a magnetic core, an inlet wire winding and an outlet wire winding, efficient electromagnetic coupling and isolation of multi-path signals are achieved through the magnetic core, and a main control chip can send control signals to equipment through a driver and a coupling winding. And receiving an equipment feedback signal. The system can extract characteristics of a control signal and a feedback signal in real time, dynamically calculate a comprehensive crosstalk index, and adaptively adjust parameters of a receiving filter and a driver according to the comprehensive crosstalk index, so that signal crosstalk caused by physical coupling among multiple channels is effectively inhibited. According to the scheme, the structure is simplified, the system cost is reduced, the communication quality and the anti-interference capability of multiple paths of signals in a low-voltage power grid are remarkably improved, and the system is suitable for multiple occasions such as high-reliability power line communication.

A photovoltaic inverter includes an inverter circuit, a communication circuit, an arc detection circuit, and a transformer. The transformer includes one magnetic core, at least one primary-side coil, and at least two secondary-side coils. The primary-side coil and the secondary-side coils of the transformer are wound around the magnetic core. One end of a first primary-side coil of the transformer is configured to connect to a power supply, the other end of the first primary-side coil is configured to connect to an input end of the inverter circuit, a first secondary-side coil of the transformer is configured to connect to the communication circuit, and a second secondary-side coil of the transformer is configured to connect to the arc detection circuit, to implement both power line communication and arc detection on the basis that the transformer includes the magnetic core.

The invention provides a cooperative identification method and system for a power line communication signal and an arc fault, and the method comprises the steps: firstly, constructing and training a double-flow communication fault sensor comprising a sensing early-warning sub-module and an active sensing sub-module, then carrying out the communication fault sensing based on the double-flow communication fault sensor, generating a communication fault sensing data set, and transmitting the communication fault sensing data set to a server; then, a graph neural network is adopted to carry out fault mode recognition on the communication fault sensing data set, a communication fault mode graph is generated, then, communication fault positioning is carried out based on the communication fault mode graph, a communication fault positioning data set is generated, and finally, actual feedback data of the communication fault positioning data set is obtained. And the system is updated according to the actual feedback data, so that the fault diagnosis rate and accuracy are improved.

The invention discloses a frequency spectrum and power distribution method for a hybrid power line / wireless MIMO (Multiple Input Multiple Output) system, which relates to the technical field of hybrid power line / wireless MIMO system communication and comprises the following steps: establishing a channel model for wireless MIMO communication and power line communication based on OFDM (Orthogonal Frequency Division Multiplexing) modulation; the method comprises the following steps: performing precoding and merging processing on wireless MIMO signals by adopting SVD (Singular Value Decomposition), so that each sub-carrier forms a plurality of parallel sub-channels; frequency spectrum allocation and power allocation are carried out through alternate optimization, and greedy frequency spectrum allocation is carried out according to parallel channel gains. According to the frequency spectrum and power distribution method for the hybrid power line / wireless MIMO system, a water injection algorithm is adopted to perform joint power distribution on wireless and PLC subcarriers, so that the power distribution is more flexible, the reliability of data transmission is improved, SVD is adopted to perform channel pre-coding, and a maximum ratio combining method is combined to combine receiving end signals, so that the reliability of data transmission is improved. And the signal quality and the system robustness are enhanced.

The invention discloses a power line communication signal sending and receiving method and device based on a semi-parallel architecture, and belongs to the technical field of power system communication. The method comprises the following steps: obtaining a sending signal comprising a plurality of sub-signals, dynamically determining the number R of parallel processing units according to a transmission data rate and a clock frequency, phase adjustment, frequency domain transformation, linear combination and filtering processing are carried out through R parallel processing units in the DCT module, the matrix module and the multi-phase filter module in sequence, and finally processed signals are serialized and sent to a power line channel; and the receiving process reversely executes corresponding processing. Therefore, by implementing the method and the device, the problem that the transmission rate and the communication stability of the system are difficult to effectively improve while low resource consumption and low power consumption are ensured in the prior art can be solved.

The present application is applied to the technical field of power line communications. Disclosed are a communication method and apparatus, which are used for improving the accuracy of bitloading training in assigned CSMA slots and also improving the communication performance. The method comprises: a first apparatus can acquire first information, wherein the first information comprises a first link identifier (LID) and configuration information, the first LID is used for indicating a first service, the configuration information is used for configuring a time window, and the time window is used for sending a signal of the first service; and the first apparatus can send a training frame in a first time domain unit within the time window on the basis of the configuration information, wherein the time window comprises one or more time domain units, the one or more time domain units comprise the first time domain unit, and the signal of the first service comprises the training frame.

Provided in the embodiments of the present application are a power line communication method, apparatus and system. The method comprises: a first node receiving a detection signal sent by a second node, wherein the detection signal is used for determining the channel quality of a power line channel between the first node and the second node; and the first node sending mapping information to the second node, wherein the mapping information is used for indicating a mapping relationship between a first parameter and a second parameter which are determined on the basis of the channel quality, the first parameter comprises a modulation order, a code block length and / or a frequency band, and the second parameter comprises the number of repeated transmissions of an encoded code block in power line signal transmission. The method can shorten the time needed for determining the number of repeated transmissions of an encoded code block in power line signal transmission, and can also reduce system overheads.

The invention provides a power supply and distribution system based on a superior circuit breaker (UD) or a control center for actively indicating subordinate circuit breakers (DD) to act, which comprises the superior circuit breaker and a plurality of subordinate circuit breakers, the superior circuit breaker is communicated with the subordinate circuit breakers through a power line communication line, a UD indicating unit is arranged in the superior circuit breaker, and the subordinate circuit breakers are communicated with the subordinate circuit breakers. A DD receiving unit is arranged in the lower-stage circuit breaker; the UD indication unit of the upper-stage circuit breaker is used for detecting short circuit or leakage current, generating an action indication signal for indicating the action of the lower-stage circuit breaker, modulating the action indication signal into a power line communication signal, and sending the power line communication signal to the corresponding lower-stage circuit breaker through a power line communication line, so that the lower-stage circuit breaker with short circuit or leakage current fault in a protection range trips; the DD receiving unit of the subordinate circuit breaker is used for detecting short circuit or leakage current and receiving a power line communication signal, and drives the subordinate circuit breaker to trip after demodulation. The invention further discloses a corresponding control method.

A power and communication transmission arrangement includes an electronic accessory having a first modulator / demodulator. A motor vehicle includes a charging system to provide a power signal to the electronic accessory. At least one electrical conductor carries the power signal from the charging system to the electronic accessory. An infotainment system bi-directionally communicates with the electronic accessory. A second modulator / demodulator modulates the power signal based upon first signals received from the infotainment system to form first modulated power signals such that the first modulator / demodulator demodulates the first modulated power signals to extract the first signals for use in the electronic accessory. The first modulator / demodulator modulates the power signal based upon second signals from the electronic accessory to form second modulated power signals such that the second modulator / demodulator demodulates the second modulated power signals to extract the second signals for use in the infotainment system.

The invention relates to a power line carrier communication system, the system comprises a sending end module, a receiving end module and a channel adjusting module which are connected in sequence, the sending end module is used for converting a data signal into a carrier signal and transmitting the carrier signal through a power line; the receiving end module comprises a demodulation system, and the demodulation system is in communication connection with the transmitting end module through a power line and receives and demodulates the carrier signal to recover the carrier signal into a data signal; the channel adjusting module is connected with the transmitting end module, is in communication connection with the receiving end module through the transmitting end module, and is used for dynamically adjusting parameters of carrier signals according to channel characteristics of the power line; the power line carrier communication method comprises the steps of data signal processing, channel monitoring, channel adjustment and carrier signal transmission. According to the power line carrier communication system and the communication method, the stability, the transmission rate and the anti-interference capability of power line carrier communication are improved, the overall performance of communication is effectively improved, and the power line carrier communication system and the communication method are suitable for various application scenes such as intelligent power grids and the Internet of Things.

The embodiment of the present application discloses a power line communication time slot allocation method, which comprises the following steps: a first relay node receives a first time slot allocation message sent by a superior node, the first time slot allocation message comprises forwarding information and first time slot information, wherein the forwarding information comprises a forwarding indication that at least one relay node needs to forward the first time slot allocation message; the first relay node updates the first time slot information to obtain second time slot information; wherein the updating comprises deleting expired time slot indications in the first time slot information; and the first relay node sends a second time slot allocation message containing the forwarding information and the second time slot information. According to the embodiment, each relay node can delete the expired time slots before forwarding the time slot indication information, thereby saving transmission resources and improving processing efficiency.

The embodiment of the invention discloses a photovoltaic junction box and a photovoltaic panel control system, a positive electrode interface and a negative electrode interface are arranged in the photovoltaic junction box and are respectively connected with the positive electrode and the negative electrode of a photovoltaic panel, the positive electrode and the negative electrode of the photovoltaic panel are both connected with a power line, and a bypass circuit is arranged between the positive electrode interface and the negative electrode interface. And arranging a power line communication circuit between the positive interface and the negative interface to realize data communication according to a power line. Therefore, the communication of the photovoltaic panel is realized under the condition of not arranging an additional device, and the cost of the photovoltaic panel control system is reduced.

The invention provides an intelligent power distribution equipment remote identification method and system based on power line communication, and relates to the technical field of electric power, and the method comprises the steps: receiving equipment identification information, building a three-layer architecture equipment information database, sending an identity verification request, receiving a verification response, constructing a multi-level block chain network architecture, and determining the node credibility; and judging whether the identity verification is passed or not according to the verification result and the credibility, and establishing a secure communication link when the verification is passed. The safety and reliability of identity recognition of the intelligent power distribution equipment are improved, and illegal equipment is effectively prevented from accessing the power distribution network.