A communication method integrating power line carrier and wireless dual mode

Abstract

The present invention discloses a communication method for the fusion of power line carrier and wireless dual modes, which relates to the field of communication technology. The method comprises the following steps: synchronously collecting three-phase power line carrier signals and wireless signals to generate a wireless available spectrum diagram; separating multiple power line basic modes from the power line carrier signals, screening out the power line effective modes after mode validity determination, and combining the orthogonality loss and phase offset of the power line effective modes into a power line feature vector; generating wireless basic modes based on the wireless available spectrum diagram, performing access condition screening to screen out the wireless effective modes, and combining the delay spread and spectrum efficiency of the wireless effective modes into a wireless feature vector; constructing a similarity matrix, using the similarity matrix as a cost matrix, matching the optimal mode pairs of the power line effective modes and the wireless effective modes, determining the modulation mode according to the matching results, and solving the limitations of multipath phase distortion, spectrum conflict and static channel estimation.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a communication method integrating power line carrier and wireless dual-mode. Background Art

[0002] In the field of smart grid and Internet of Things communications, power line carrier communication (PLC) and wireless communication technology form a complementary fusion architecture. PLC technology uses the existing power line infrastructure to achieve low-cost data transmission and is widely used in scenarios such as smart meters and distribution automation. Wireless communication technologies (such as Wi-Fi and Bluetooth) provide flexible mobile access capabilities. The existing dual-mode fusion solution achieves basic collaboration through frequency band division.

[0003] Due to the large number of branch nodes in the power network, such as distribution transformers and meter nodes, multipath reflections will occur during the transmission of the carrier signal, resulting in phase distortion and signal attenuation. Experimental data show that the signal attenuation of different phases in the three-phase power line can reach more than 30dB, and the phase offset may exceed 90 degrees. This has a serious impact on the communication system using Orthogonal Frequency Division Multiplexing (OFDM) technology, destroying the orthogonality between subcarriers, and thus significantly increasing the bit error rate (BER). Increase to .

[0004] On the other hand, the rapid development of wireless communication technologies, especially the application of software-defined radio (SDR) and cognitive radio (CR) technologies, has provided new solutions for dynamic spectrum management and the efficient utilization of spectrum resources. However, wireless communications also face problems such as limited spectrum resources, spectrum conflicts, and interference. Spectrum conflicts are particularly severe in crowded frequency bands, such as the 2.4 GHz Wi-Fi band. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the present invention provides a communication method that integrates power line carrier and wireless dual modes. By synchronously collecting three-phase power line signals and wireless spectrum, dynamically decomposing and screening effective modes, adaptive mode matching and joint modulation, etc., it solves the limitations of multipath phase distortion, spectrum conflict and static channel estimation.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a communication method integrating power line carrier and wireless dual mode, comprising:

[0009] Synchronously collect three-phase power line carrier signals and wireless signals to generate wireless available spectrum diagrams;

[0010] Multiple power line basic modes are separated from the power line carrier signal. After the modal validity is determined, the effective power line modes are screened out. The orthogonality loss and phase offset of the effective power line modes are combined into a power line feature vector.

[0011] Based on the wireless available spectrum graph, the system generates wireless basic modes, performs access condition screening, selects effective wireless modes, and combines the delay spread and spectrum efficiency of the effective wireless modes into a wireless feature vector.

[0012] The similarity matrix is constructed by the power line eigenvector and the wireless eigenvector. The calculation formula of the elements in the similarity matrix is: ,in, Represents the elements in the similarity matrix, n is the row in the similarity matrix, m is the column in the similarity matrix, represents the power line weight, , represents wireless weight, , Softmax() is the Softmax function, is the orthogonality loss, is the phase shift, is the spectrum efficiency, is the delay extension;

[0013] The similarity matrix is used as the cost matrix, and the Hungarian algorithm is applied to find the optimal mode pair of power line effective mode and wireless effective mode, with the goal of maximizing the total throughput: ,The matching results form a modal pair list, a joint constellation diagram is generated according to the matching results, and the modulation mode is determined.

[0014] Furthermore, an energy detection method is used to detect the energy of each wireless sub-band. Bands with energy above the threshold are marked as occupied. Cyclostationary detection is used to identify the occupied frequency bands of Wi-Fi and Bluetooth and mark them as conflicting. Based on the markings, a wireless available spectrum map is generated, marking the availability of each sub-band, including available, occupied, and conflicting.

[0015] Furthermore, multiple power line basic modes are separated, including:

[0016] The local maximum and minimum amplitudes of each phase of the power line carrier signal are detected, and the credible transmission envelope and interference suppression envelope are generated using cubic spline interpolation. The mean of the credible transmission envelope and the interference suppression envelope is calculated to obtain the envelope mean line. Based on the envelope mean line, the power line carrier signal is decomposed into multiple power line basic modes using empirical mode decomposition.

[0017] Furthermore, the modal validity determination includes:

[0018] For each power line fundamental mode, the orthogonality loss degree is obtained by calculating the sum of the mutual correlation coefficients with other power line fundamental modes. ;

[0019] Select a power line fundamental mode as the reference mode, and for each power line fundamental mode, calculate its phase shift relative to the reference mode. : ,in, Indicates the i The power line fundamental modes, is the reference mode, F {} is Fourier transform;

[0020] A power line fundamental mode with an orthogonality loss degree less than a loss degree threshold and a phase offset less than an offset threshold is selected as a power line effective mode.

[0021] Furthermore, the basic wireless modalities are generated, including:

[0022] Based on the generated wireless available spectrum map, the available frequency bands that are not marked as conflicting or occupied are divided into multiple sub-channels. The received signal strength and bit error rate of the sub-channels are measured. If the received signal strength of the sub-channel is higher than the preset signal strength threshold and the bit error rate is lower than the preset bit error rate threshold, it is marked as an available sub-channel. Otherwise, it is marked as an interfering sub-channel. Adjacent available sub-channels are merged into continuous frequency bands to form a wireless basic mode.

[0023] Further, the entry conditions are screened, including:

[0024] For each radio mode, the delay spread is measured by the channel impulse response. , combining channel bandwidth and signal-to-noise ratio to calculate spectral efficiency η : ,in, B is the channel bandwidth, P is the signal power, is the noise power;

[0025] Only wireless basic modes that simultaneously meet the conditions that the delay spread is less than the delay threshold and the spectrum efficiency is greater than the efficiency threshold are retained as wireless effective modes.

[0026] Furthermore, a similarity matrix is constructed and used as a cost matrix to match the optimal mode pair of the power line effective mode and the wireless effective mode, including:

[0027] The similarity matrix is constructed by the power line eigenvector and the wireless eigenvector. The elements in the similarity matrix are : , where n is the number of effective power line modes, m is the number of effective wireless modes, is the power line weight, , is the wireless weight, , orthogonality loss , phase offset , spectrum efficiency and delay spread ;

[0028] The similarity matrix is used as the cost matrix, and the Hungarian algorithm is applied to find the optimal mode pair of power line effective mode and wireless effective mode, with the goal of maximizing the total throughput: , the matching results form a modality pair list.

[0029] Furthermore, a joint constellation diagram is generated based on the matching results, and a modulation mode is determined, including:

[0030] For successfully matched mode pairs, a joint constellation diagram is generated based on the power line eigenvector and the wireless eigenvector: if the orthogonality loss is less than 0.1, QPSK modulation is used on the power line side, otherwise, BPSK modulation is used; if the spectrum efficiency is greater than 6, 64-QAM modulation is used on the wireless side, otherwise, 16-QAM modulation is used. A 64- or 256-point constellation diagram is generated through the Cartesian product. The unmatched power line effective mode is directly modulated with BPSK, and the wireless effective mode is modulated with QPSK.

[0031] An electronic device comprises a memory, a processor, and a computer program stored in the memory and running on the processor, wherein when the processor executes the computer program, it implements a communication method for integrating power line carrier and wireless dual mode as described in any one of the above items.

[0032] A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the communication method for integrating power line carrier and wireless dual-mode as described in any one of the above items is implemented.

[0033] (3) Beneficial effects

[0034] The present invention provides a communication method that integrates power line carrier and wireless dual-mode communication, which has the following beneficial effects:

[0035] (1) By deploying broadband couplers at the three-phase nodes of the power line and performing synchronous acquisition, the time domain waveform and spectrum characteristics of the three-phase power line carrier signal can be accurately obtained, which not only improves the accuracy of signal acquisition, but also ensures the consistency of phase information between the three-phase signals. The application of adaptive notch filters can dynamically filter out power frequency harmonics and pulse noise, effectively improving the transmission quality of the power line carrier signal. By marking the conflicting frequency bands and generating a wireless available spectrum map, it is possible to select unoccupied or less interfered frequency bands for communication, thereby improving the utilization of the wireless spectrum and reducing spectrum conflicts and interference.

[0036] (2) By separating multiple power line basic modes and screening out modes with low orthogonality loss and small phase offset for communication, the signal interference and bit error rate increase caused by multipath reflection and phase distortion can be effectively reduced, which helps to improve the reliability and stability of power line carrier communication. The modal validity screening process ensures that only high-quality power line basic modes are used for communication, thereby avoiding unnecessary waste of resources and helping to achieve more efficient data transmission within the limited power line bandwidth.

[0037] (3) By marking available subchannels and interference subchannels, it helps to avoid using subchannels with poor performance during communication, thereby improving the stability and reliability of communication. By measuring the delay spread of each wireless basic mode and calculating the spectrum efficiency, the performance indicators of the wireless basic mode can be accurately evaluated, and only the wireless basic modes that meet the conditions are retained as wireless effective modes. This helps to screen out wireless basic modes with excellent performance and improve the overall performance of the communication system.

[0038] (4) By constructing a similarity matrix and applying the Hungarian algorithm, the power line effective mode and the wireless effective mode can be optimally matched, thereby achieving optimal allocation of communication resources. Taking into account the characteristics of the power line and wireless channels, it helps to maximize the total throughput and improve communication efficiency. Through mode matching and modulation method selection, it helps to reduce the bit error rate during the communication process. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the communication method steps for integrating power line carrier and wireless dual-mode according to the present invention;

[0040] Figure 2 This is a schematic diagram of the power line basic modal decomposition process of the present invention;

[0041] Figure 3 This is a schematic diagram of the wireless spectrum processing and modal screening process of the present invention. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] See also Figure 1-Figure 3 The present invention provides a communication method for integrating power line carrier and wireless dual mode, comprising the following steps:

[0044] Step 1: Synchronously collect three-phase power line carrier signals and wireless signals, suppress power line interference, eliminate wireless spectrum conflicts, and generate a wireless available spectrum map;

[0045] The step 1 includes the following contents:

[0046] Step 101: deploying a broadband coupler at a three-phase node on a power line to collect a 0.1 MHz to 30 MHz power line carrier signal;

[0047] Specifically, broadband couplers (such as capacitive voltage dividers or current transformers) are installed at three-phase power line nodes (such as distribution transformers and meter nodes). These broadband couplers use multi-band couplers that support the 0.1MHz-30MHz frequency band, have an impedance matching range of 20Ω-200Ω, and a standing wave ratio of <1.5. This ensures electrical isolation between the three-phase coupler and the power line node to avoid introducing additional noise.

[0048] Start the broadband coupler and synchronously collect the three-phase power line carrier signal through the high-speed ADC (analog-to-digital converter, sampling rate ≥ 60MS / s), record the time domain waveform (such as voltage / current waveform) and spectrum characteristics (FFT analysis) of each phase signal, and synchronize the three-phase signal with the GPS clock (accuracy ≤ 1μs) to ensure the consistency of phase information.

[0049] Step 102: Enable multi-band scanning in the wireless communication module to obtain channel status information in real time;

[0050] Specifically, configure the wireless communication module (such as software-defined radio (SDR)) to operate in the 470MHz-2.4GHz frequency band, divide the frequency band into sub-bands (such as 200kHz granularity), start multi-band scanning, detect the RSSI (received signal strength indicator), signal-to-noise ratio (SNR), and delay spread of each sub-band, and record the occupancy status and interference intensity of the conflicting frequency band (such as the 2.4GHz band of Wi-Fi);

[0051] Step 103: Adopting an adaptive notch filter on the power line carrier signal to dynamically filter out power frequency harmonics and impulse noise;

[0052] Specifically, power frequency harmonic suppression: detect the frequency of 50 / 60 Hz power frequency and its harmonics (such as 100 Hz, 150 Hz, etc.) through frequency domain analysis, use a variable band-stop filter (such as IIR or FIR filter), dynamically adjust the center frequency and bandwidth (such as ±5% harmonic frequency), use the LMS algorithm (least mean square algorithm) to track the harmonic frequency changes in real time, and update the filter parameters. Pulse noise suppression: detect pulse noise (such as switching power supply and motor starting noise) in the time domain, and perform threshold denoising through wavelet transform (such as Daubechies wavelet); divide the power line carrier signal into multiple frequency bands (such as 0.1 MHz-3 MHz, 3 MHz-10 MHz, 10 MHz-30 MHz), and apply bandpass filters to each frequency band. For the low frequency band (0.1-3 MHz), retain the power frequency fundamental and suppress harmonics; for the high frequency band (3 MHz-30 MHz), retain the communication frequency band and suppress pulse noise.

[0053] Step 104: Mark the conflicting frequency bands occupied by Wi-Fi and Bluetooth to generate available wireless spectrum;

[0054] Specifically, energy detection is used to detect the energy of each wireless sub-band. A threshold value (e.g., -70dBm) is set, and bands with energy above the threshold are marked as occupied. Cyclostationary detection is used to identify the occupied bands of Wi-Fi and Bluetooth, marking them as conflicting. A wireless available spectrum map is generated based on the markings, marking the availability of each sub-band (available / occupied / conflicting). The threshold setting needs to be adjusted according to the specific application scenario to ensure that the setting does not affect the detection effect.

[0055] When using, combine the contents of steps 101 to 104:

[0056] By deploying broadband couplers at the three-phase nodes of the power line and performing synchronous acquisition, the time domain waveform and spectral characteristics of the three-phase power line carrier signal can be accurately obtained. This not only improves the accuracy of signal acquisition, but also ensures the consistency of phase information between the three-phase signals. The application of adaptive notch filters can dynamically filter out power frequency harmonics and pulse noise, effectively improving the transmission quality of the power line carrier signal. By marking conflicting frequency bands and generating a wireless available spectrum map, unoccupied or less-interfered frequency bands can be selected for communication, thereby improving the utilization of the wireless spectrum and reducing spectrum conflicts and interference.

[0057] Step 2: Separate multiple power line fundamental modes from the power line carrier signal, evaluate the orthogonality loss and phase offset of each power line fundamental mode, screen out the effective power line modes after modal validity determination, and combine the orthogonality loss and phase offset of the effective power line modes into a power line feature vector;

[0058] The second step includes the following contents:

[0059] Step 201: Detect the local maximum (trusted channel) and minimum (interference area) of the amplitude of each phase of the power line carrier signal, use cubic spline interpolation to generate a trustworthy transmission envelope and an interference suppression envelope, and calculate the envelope mean line based on the trustworthy transmission envelope and the interference suppression envelope: ,in, represents the envelope mean line, t Indicates time, represents the credible transmission envelope, represents the interference suppression envelope;

[0060] Step 202: Based on the envelope mean line, the power line carrier signal is decomposed into multiple power line fundamental modes PLC-IMF using methods such as Hilbert-Huang transform (HHT) or empirical mode decomposition (EMD). For each power line fundamental mode, the orthogonality loss degree is obtained by calculating the mutual correlation coefficient between each power line fundamental mode and other power line fundamental modes:

[0061] ,in, Indicates the i The orthogonality loss of the power line fundamental modes, and Respectively represent i and j The power line fundamental modes, Corr () represents the mutual correlation coefficient between the two power line fundamental modes, , ,and ;

[0062] Step 203: Selecting a power line fundamental mode as a reference mode, including: calculating the energy of each power line fundamental mode: ,in, Indicates the i The energy of the fundamental mode of the power line, Fs represents the sampling frequency, f represents the frequency point, FFT() represents the fast Fourier transform, and the first several power line basic modes (such as the first 5) with the lowest orthogonality loss are sorted from high to low according to energy, and the mode with the lowest orthogonality loss is used as the reference mode;

[0063] When calculating frequency domain energy, the frequency point fTaking 0 corresponds to the DC component of the signal, that is, the part of the signal that does not change with time. In power line carrier communication (PLC) or other similar application scenarios, the DC component of the signal may not have the function of transmitting communication information. Therefore, if it is decided not to include the DC component, the formula can be modified to start the summation from the first non-zero frequency, that is, the frequency point f Take the minimum non-zero frequency, usually the first positive frequency component;

[0064] Step 204: For each power line fundamental mode, calculate its phase offset relative to the reference mode: ,in, represents the phase shift, F {} represents Fourier transform, and the arg() function returns the phase angle of the complex number;

[0065] Step 205: Preset a loss threshold and an offset threshold, select a power line fundamental mode with an orthogonality loss less than the loss threshold and a phase offset less than the offset threshold as the power line effective mode, and combine the orthogonality loss and phase offset of the power line effective mode into a power line feature vector: ,in, represents the power line eigenvector, n Indicates the number of effective power line modes. When setting the loss threshold and offset threshold, adjust them based on actual results. Ensure that the selected effective power line mode is as independent as possible from other effective power line modes to ensure signal synchronization and stability.

[0066] When using, combine the contents of steps 201 to 205:

[0067] By separating multiple power line fundamental modes and selecting modes with low orthogonality loss and small phase offset for communication, signal interference and increased bit error rate caused by multipath reflection and phase distortion can be effectively reduced, which helps to improve the reliability and stability of power line carrier communication. The modal validity screening process ensures that only high-quality power line fundamental modes are used for communication, thereby avoiding unnecessary waste of resources and helping to achieve more efficient data transmission within the limited power line bandwidth.

[0068] Step 3: Generate basic wireless modes based on the available wireless spectrum map. Calculate the delay spread and spectrum efficiency of each basic wireless mode. Then, perform access screening to select effective wireless modes. The delay spread and spectrum efficiency of these effective wireless modes are combined into a wireless feature vector.

[0069] The step three includes the following contents:

[0070] Step 301: Based on the wireless available spectrum map generated in step 1 (with occupied / conflicting frequency bands marked), the available frequency bands not marked as conflicting or occupied are divided into multiple sub-channels. The sub-channel bandwidth (e.g., 200 kHz or less) is set based on the application scenario. If local interference (e.g., burst noise) exists within a sub-channel, the bandwidth is further subdivided to isolate the interference area, ensuring that the frequency bands of adjacent sub-channels are continuous and avoiding spectrum fragmentation.

[0071] Step 302: Send a predefined test signal (e.g., a pseudo-random sequence) via a software defined radio (SDR) to measure the received signal strength (RSSI) and bit error rate (BER) of the sub-channel. If the received signal strength of the sub-channel is higher than a preset signal strength threshold (e.g., -70 dBm) and the BER is lower than a preset BER threshold (e.g., ), it is marked as an available sub-channel, otherwise it is marked as an interference sub-channel;

[0072] The preset signal strength threshold is used to determine whether the subchannel's received signal strength (RSSI) is high enough to ensure communication quality. Typically, the signal strength threshold is set based on the ambient noise level and the desired communication reliability. The preset bit error rate threshold is used to measure whether the subchannel's bit error rate (BER) is within an acceptable range. The lower the BER, the higher the communication quality. The setting of the BER threshold should take into account the requirements of the communication system and the noise characteristics of the application scenario.

[0073] Step 303: Merge adjacent available subchannels into a continuous frequency band to form a wireless basic mode RF-IMF. If there is local interference in the merged frequency band (for example, a single subchannel is marked as an interference band), only the uninterrupted subchannel portion is retained.

[0074] Step 304: For each wireless basic mode, measure its delay spread (the range of signal propagation delay difference) using the channel impulse response (CIR). The formula is: ,in, represents the delay spread, and Respectively represent the latest and earliest delays of signal arrival;

[0075] Step 304: For each wireless basic mode, the spectrum efficiency is calculated by combining the channel bandwidth and the signal-to-noise ratio (SNR). The formula is: ,in, η represents the spectrum efficiency, B represents the channel bandwidth, P represents the signal power, represents the noise power;

[0076] Step 305: Each wireless basic mode is screened for access conditions. A delay threshold and an efficiency threshold are pre-set. Only wireless basic modes that simultaneously meet the conditions of delay spread less than the delay threshold and spectrum efficiency greater than the efficiency threshold are retained as wireless effective modes. The delay spread and spectrum efficiency of the wireless effective modes are combined into a wireless feature vector: ,in, represents the wireless feature vector, m Indicates the number of valid wireless modes;

[0077] The delay threshold is used to screen the delay spread of the wireless basic mode. The smaller the delay spread, the smaller the delay variation of signal propagation and the more stable the performance of the communication system. The setting of the delay threshold should be determined based on the delay tolerance of the communication system and the transmission requirements of the application scenario. The efficiency threshold is used to measure whether the spectrum efficiency of the wireless basic mode meets the expected level. The higher the spectrum efficiency, the more information can be transmitted within a given bandwidth. The setting of the efficiency threshold should comprehensively consider the bandwidth requirements of the communication system and the utilization efficiency of spectrum resources.

[0078] When using, combine the contents of steps 301 to 305:

[0079] By marking available subchannels and interfering subchannels, it helps to avoid using subchannels with poor performance during communication, thereby improving the stability and reliability of communication. By measuring the delay spread and calculating the spectrum efficiency of each wireless basic mode, the performance indicators of the wireless basic mode can be accurately evaluated, and only the wireless basic modes that meet the conditions are retained as wireless effective modes. This helps to screen out wireless basic modes with excellent performance and improve the overall performance of the communication system.

[0080] Step 4: Build a similarity matrix using the power line and wireless feature vectors. Use the similarity matrix as the cost matrix. The goal is to maximize the total throughput and match the optimal mode pair of the power line effective mode and the wireless effective mode. Generate a joint constellation diagram based on the matching results and determine the modulation method.

[0081] The fourth step includes the following contents:

[0082] Step 401: construct a similarity matrix using the power line eigenvector and the wireless eigenvector. The calculation formula for the elements in the similarity matrix is: ,in, Represents the elements in the similarity matrix, n is the row in the similarity matrix, m is the column in the similarity matrix, represents the power line weight, , represents wireless weight, , Softmax() is the Softmax function;

[0083] Step 402: Using the similarity matrix as the cost matrix, the Hungarian algorithm is applied to find the optimal mode pair of the power line effective mode and the wireless effective mode, with the goal of maximizing the total throughput: , the matching results form a modality pair list;

[0084] Step 403: For successfully matched mode pairs, a joint constellation is generated based on the power line eigenvector and the wireless eigenvector. If the orthogonality loss is less than 0.1 (good orthogonality), QPSK modulation is used on the power line side; otherwise, BPSK modulation is used. If the spectrum efficiency is greater than 6 (bits / s / Hz), 64-QAM modulation is used on the wireless side; otherwise, 16-QAM modulation is used. A 64- or 256-point constellation is generated through a Cartesian product. BPSK modulation is directly used for unmatched power line valid modes, while QPSK modulation is used for valid wireless modes to ensure basic communication reliability.

[0085] When using, combine the contents of step 401 to step 403:

[0086] By constructing a similarity matrix and applying the Hungarian algorithm, the effective power line mode and the effective wireless mode can be optimally matched, thereby achieving optimal allocation of communication resources. Taking into account the characteristics of the power line and wireless channels, it helps to maximize the total throughput and improve communication efficiency. Through mode matching and modulation method selection, it helps to reduce the bit error rate during the communication process.

[0087] An electronic device comprises a memory, a processor, and a computer program stored in the memory and running on the processor, wherein when the processor executes the computer program, it implements a communication method for integrating power line carrier and wireless dual mode as described in any one of the above methods.

[0088] A computer-readable storage medium includes a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements a communication method for integrating power line carrier and wireless dual mode as described in any one of the above methods.

[0089] The above formulas are all dimensionless and numerical calculations. The formulas are obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters, weights and thresholds in the formulas are set by technicians in this field according to actual conditions.

[0090] The above embodiments can be implemented in whole or in part via software, hardware, firmware, or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. When loaded or executed on a computer, the processes or functions described in accordance with the embodiments of the present invention are fully or partially performed. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer instructions can be transferred from one website, computer, server, or data center to another website, computer, server, or data center via a wired or wireless network. The computer-readable storage medium can be any available medium accessible by a computer, or a data storage device such as a server or data center that contains a collection of one or more available media. The available medium can be magnetic media (e.g., floppy disks, hard disks, or magnetic tapes), optical media (e.g., DVDs), or semiconductor media. The semiconductor media can be a solid-state drive.

[0091] Those skilled in the art will appreciate that the units and algorithm steps described in the various examples in conjunction with the embodiments disclosed herein can be implemented using a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution.

[0092] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, and may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment as needed.

[0093] The above is only a specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this application, which should be covered by the scope of protection of the present application.

Claims

1. A communication method integrating power line carrier and wireless dual-mode communication, characterized in that: include: Synchronously collect three-phase power line carrier signals and wireless signals to generate wireless available spectrum diagrams; Multiple power line basic modes are separated from the power line carrier signal. After the modal validity is determined, the effective power line modes are screened out, and the orthogonality loss and phase offset of the effective power line modes are combined into a power line feature vector. Based on the wireless available spectrum graph, the wireless basic mode is generated, and access conditions are screened to select the wireless effective mode. The delay spread and spectrum efficiency of the wireless effective mode are combined into a wireless feature vector. The similarity matrix is constructed by the power line eigenvector and the wireless eigenvector. The calculation formula of the elements in the similarity matrix is: ,in, Represents the elements in the similarity matrix, n is the row in the similarity matrix, m is the column in the similarity matrix, represents the power line weight, , represents wireless weight, , Softmax() is the Softmax function, is the orthogonality loss, is the phase shift, is the spectrum efficiency, is the delay extension; The similarity matrix is used as the cost matrix, and the Hungarian algorithm is applied to find the optimal mode pair of power line effective mode and wireless effective mode, with the goal of maximizing the total throughput: ,The matching results form a modal pair list, a joint constellation diagram is generated according to the matching results, and the modulation mode is determined.

2. The communication method of power line carrier and wireless dual-mode fusion according to claim 1, characterized in that: Energy detection is used to detect the energy of each wireless sub-band. Bands with energy above a threshold are marked as occupied. Cyclostationary detection is used to identify the occupied bands of Wi-Fi and Bluetooth and mark them as conflicting. A wireless available spectrum map is generated based on the markings, marking the availability of each sub-band, including available, occupied, and conflicting.

3. The communication method of power line carrier and wireless dual-mode fusion according to claim 1, characterized in that: Multiple power line basic modes are separated, including: The local maximum and minimum amplitudes of each phase of the power line carrier signal are detected, and the credible transmission envelope and interference suppression envelope are generated using cubic spline interpolation. The mean of the credible transmission envelope and the interference suppression envelope is calculated to obtain the envelope mean line. Based on the envelope mean line, the power line carrier signal is decomposed into multiple power line basic modes using empirical mode decomposition.

4. The communication method of power line carrier and wireless dual-mode fusion according to claim 3, characterized in that: Modal validity determination, including: For each power line fundamental mode, the orthogonality loss degree is obtained by calculating the sum of the mutual correlation coefficients with other power line fundamental modes. ; Select a power line fundamental mode as the reference mode, and for each power line fundamental mode, calculate its phase shift relative to the reference mode. : ,in, Indicates the i The power line fundamental modes, is the reference mode, F {} is Fourier transform; A power line fundamental mode with an orthogonality loss degree less than a loss degree threshold and a phase offset less than an offset threshold is selected as a power line effective mode.

5. The communication method of power line carrier and wireless dual-mode fusion according to claim 1, characterized in that: Generate basic wireless modes, including: Based on the generated wireless available spectrum map, the available frequency bands that are not marked as conflicting or occupied are divided into multiple sub-channels. The received signal strength and bit error rate of the sub-channels are measured. If the received signal strength of the sub-channel is higher than the preset signal strength threshold and the bit error rate is lower than the preset bit error rate threshold, it is marked as an available sub-channel. Otherwise, it is marked as an interfering sub-channel. Adjacent available sub-channels are merged into continuous frequency bands to form a wireless basic mode.

6. The communication method of power line carrier and wireless dual-mode fusion according to claim 5, characterized in that: Conduct entry screening, including: For each radio mode, the delay spread is measured by the channel impulse response. , combining channel bandwidth and signal-to-noise ratio to calculate spectral efficiency η : ,in, B is the channel bandwidth, P is the signal power, is the noise power; Only wireless basic modes that simultaneously meet the conditions that the delay spread is less than the delay threshold and the spectrum efficiency is greater than the efficiency threshold are retained as wireless effective modes.

7. The communication method of power line carrier and wireless dual-mode fusion according to claim 1, characterized in that: Generate a joint constellation diagram based on the matching results and determine the modulation method, including: For successfully matched mode pairs, a joint constellation diagram is generated based on the power line eigenvector and the wireless eigenvector: if the orthogonality loss is less than 0.1, QPSK modulation is used on the power line side, otherwise, BPSK modulation is used; if the spectrum efficiency is greater than 6, 64-QAM modulation is used on the wireless side, otherwise, 16-QAM modulation is used. A 64- or 256-point constellation diagram is generated through the Cartesian product. The unmatched power line effective mode is directly modulated with BPSK, and the wireless effective mode is modulated with QPSK.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the communication method for integrating power line carrier and wireless dual mode according to any one of claims 1 to 7 is implemented.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed, the communication method for integrating power line carrier and wireless dual-mode according to any one of claims 1 to 7 is implemented.

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