Communication method for power line carrier and wireless dual-mode fusion

Abstract

The invention discloses a power line carrier and wireless dual-mode fusion communication method, which relates to the technical field of communication, and comprises the following steps: synchronously acquiring a three-phase power line carrier signal and a wireless signal, and generating a wireless available spectrogram; a plurality of power line basic modes are separated from the power line carrier signals, power line effective modes are screened out after mode effectiveness judgment, and orthogonality loss degrees and phase deviations of the power line effective modes are combined into power line feature vectors; based on the wireless available spectrogram, a wireless basic mode is generated, access condition screening is carried out, a wireless effective mode is screened out, and time delay spread and spectral efficiency of the wireless effective mode are combined into a wireless feature vector; the method comprises the following steps: constructing a similarity matrix, taking the similarity matrix as a cost matrix, matching an optimal mode pair of a power line effective mode and a wireless effective mode, determining a modulation mode according to a matching result, and solving the limitation 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 technology (such as Wi-Fi and Bluetooth) provides flexible mobile access capabilities. The existing dual-mode fusion solution achieves basic collaboration through frequency band division.

[0003] Since there are a large number of branch nodes in the power network, such as distribution transformers and meter nodes, multipath reflection will occur in the carrier signal during transmission, 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 shift 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 technology, especially the application of software-defined radio (SDR) and cognitive radio (CR) technology, has provided new solutions for dynamic spectrum management and effective utilization of spectrum resources. However, wireless communication also faces problems such as limited spectrum resources, spectrum conflicts and interference, especially in crowded frequency bands such as the 2.4GHz Wi-Fi band, where spectrum conflicts are particularly serious. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a communication method that integrates power line carrier and wireless dual modes, which solves the limitations of multipath phase distortion, spectrum conflict and static channel estimation through the steps of synchronously collecting three-phase power line signals and wireless spectrum, dynamically decomposing and screening effective modes, adaptive mode matching and joint modulation.

[0006] (II) Technical solution 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: Synchronously collect three-phase power line carrier signals and wireless signals to generate wireless available spectrum diagrams; Separate multiple power line basic modes from the power line carrier signal. After determining the modal effectiveness, screen out the power line effective modes, and combine the orthogonality loss degree and phase shift of the power line effective modes into a power line feature vector; Generate wireless basic modes based on the wireless available spectrum map, perform admission condition screening, screen out the wireless effective modes, and combine the delay spread and spectral efficiency of the wireless effective modes into a wireless feature vector; Construct a similarity matrix, use the similarity matrix as a cost matrix to match the optimal mode pairs of the power line effective modes and the wireless effective modes, generate a joint constellation diagram according to the matching result, and determine the modulation method.

[0007] Furthermore, perform energy detection on each wireless sub-band, mark the sub-bands with energy higher than the threshold as the conflict state, identify the occupied bands through cyclic stationary detection and mark them as the occupied state, generate a wireless available spectrum map according to the marks, and label the availability of each sub-band, including available, occupied, and conflict.

[0008] Furthermore, separate multiple power line basic modes, including: Detect the amplitude local maxima and minima of each phase of the power line carrier signal, use cubic spline interpolation to generate a credible transmission envelope and an interference suppression envelope, calculate the mean value of the credible transmission envelope and the interference suppression envelope to obtain an envelope mean line; according to the envelope mean line, use empirical mode decomposition to decompose the power line carrier signal into multiple power line basic modes.

[0009] Furthermore, the modal effectiveness determination includes: For each power line basic mode, obtain the orthogonality loss degree by calculating the sum of the cross-correlation coefficients with other power line basic modes ; Select a power line basic mode as a reference mode, and for each power line basic mode, calculate its phase shift relative to the reference mode : , where represents the i th power line basic mode, is the reference mode, F {} is the Fourier transform; Select the power line basic modes with orthogonality loss degree less than the loss degree threshold and phase shift less than the offset threshold as the power line effective modes.

[0010] Furthermore, generate wireless basic modes, including: Based on the generated wireless available spectrum map, divide the available frequency bands that are not marked as conflicting or occupied into multiple sub-channels, measure the received signal strength and bit error rate of the sub-channels. 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, mark it as an available sub-channel; otherwise, mark it as an interfering sub-channel. Merge adjacent available sub-channels into a continuous frequency band to form a wireless basic mode.

[0011] Further, perform admission condition screening, including: For each wireless basic mode, measure the delay spread through the channel impulse response , and combine the channel bandwidth and signal-to-noise ratio to calculate the spectral efficiency η : , where B is the channel bandwidth, P is the signal power, is the noise power; Only retain the wireless basic modes that simultaneously satisfy the condition that the delay spread is less than the delay threshold and the spectral efficiency is greater than the efficiency threshold as the wireless effective modes.

[0012] Further, construct a similarity matrix, and use the similarity matrix as the cost matrix to match the optimal mode pairs of the power line effective modes and the wireless effective modes, including: Construct a similarity matrix through the power line eigenvector and the wireless eigenvector. The element in the similarity matrix is: , where n is the number of power line effective modes, m is the number of wireless effective modes, is the power line weight, , is the wireless weight, , the orthogonality loss degree , the phase offset , the spectral efficiency and the delay spread ; Use the similarity matrix as the cost matrix and apply the Hungarian algorithm to find the optimal mode pairs of the power line effective modes and the wireless effective modes, with the goal of maximizing the total throughput: , and the matching result forms a mode pair list.

[0013] Further, generate a joint constellation diagram according to the matching result and determine the modulation method, including: For the successfully matched modal pairs, a joint constellation diagram is generated based on the power line feature vector and the wireless feature vector: if the orthogonality loss degree is less than 0.1, QPSK modulation is used on the power line side; otherwise, BPSK modulation is used. If the spectral 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. For the unmatched effective power line modes, BPSK modulation is directly used, and for the wireless effective modes, QPSK modulation is used.

[0014] An electronic device includes a memory, a processor, and a computer program stored on the memory and running on the processor. When the processor executes the computer program, it implements the communication method for power line carrier and wireless dual-mode fusion described in any one of the above.

[0015] A computer-readable storage medium stores a computer program. When the computer program is executed, it implements the communication method for power line carrier and wireless dual-mode fusion described in any one of the above.

[0016] (III) Beneficial effects The present invention provides a communication method for power line carrier and wireless dual-mode fusion, which has the following beneficial effects: (1) By deploying broadband couplers at the three-phase nodes of the power line and performing synchronous acquisition, the time-domain waveforms and spectral characteristics of the three-phase power line carrier signals can be accurately obtained. This not only improves the accuracy of signal acquisition but also ensures the phase information consistency among the three-phase signals. The application of the adaptive notch filter can dynamically filter out power frequency harmonics and pulse noise, effectively improving the transmission quality of the power line carrier signals. By marking the conflict frequency bands and generating a wireless available spectrum map, it is possible to select the unoccupied or less interfered frequency bands for communication, thereby improving the utilization rate of the wireless spectrum and reducing spectrum conflicts and interference.

[0017] (2) By separating multiple power line basic modes and screening out the modes with low orthogonality loss and small phase offset for communication, the 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 effectiveness screening process ensures that only high-quality power line basic modes are used for communication, thus avoiding unnecessary resource waste and helping to achieve more efficient data transmission within the limited power line bandwidth.

[0018] (3) By marking available sub-channels and interfering sub-channels, it helps to avoid using sub-channels with poor performance during communication, thereby enhancing the stability and reliability of communication. By measuring the delay spread of each wireless basic mode and calculating the spectral efficiency, the performance metrics 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, which helps to screen out wireless basic modes with excellent performance and improve the overall performance of the communication system.

[0019] (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 realizing the optimal allocation of communication resources. Considering the characteristics of the power line and the wireless channel, it helps to maximize the total throughput and improve the communication efficiency. By mode matching and modulation method selection, it helps to reduce the bit error rate during communication. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the steps of the communication method for the integration of power line carrier and wireless dual-mode of the present invention; Figure 2 It is a schematic diagram of the power line basic mode decomposition process of the present invention; Figure 3 It is a schematic diagram of the power line and wireless spectrum processing and mode screening process of the present invention. Detailed Embodiment

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1 - 3 , the present invention provides a communication method for the integration of power line carrier and wireless dual-mode, including the following steps: 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; The content of the above Step 1 includes: Step 101: Deploy broadband couplers at three-phase nodes of the power line to collect power line carrier signals of 0.1 MHz - 30 MHz; Specifically, a broadband coupler (such as a capacitive voltage divider or a current transformer) is installed at the three-phase nodes of the power line (such as distribution transformers, meter nodes). The broadband coupler is a multi-band coupler that supports the frequency band of 0.1 MHz - 30 MHz, with an impedance matching range of 20 Ω - 200 Ω and a voltage standing wave ratio < 1.5, ensuring electrical isolation between the three-phase coupler and the power line node and avoiding introducing additional noise; Start the broadband coupler and synchronously collect the three-phase power line carrier signals through a high-speed ADC (analog-to-digital converter, sampling rate ≥ 60 MS / s). Record the time-domain waveforms (such as voltage / current waveforms) and spectral characteristics (FFT analysis) of each phase signal, and perform timestamp synchronization on the three-phase signals through a GPS clock (accuracy ≤ 1 μs) to ensure the consistency of phase information. Step 102: Enable multi-band scanning in the wireless communication module to obtain channel state information in real time; Specifically, configure the wireless communication module (such as software-defined radio SDR) to work in the frequency band of 470 MHz - 2.4 GHz, divide sub-bands (such as 200 kHz granularity), start multi-band scanning, and detect the RSSI (received signal strength indication), signal-to-noise ratio (SNR), and delay spread of each sub-band segment by segment. Record the occupancy status and interference intensity of the conflicting frequency bands (such as the 2.4 GHz frequency band of Wi-Fi); Step 103: Apply an adaptive notch filter to the power line carrier signal to dynamically filter out power frequency harmonics and impulse noise; Specifically, power frequency harmonic suppression: Detect the frequency points of 50 / 60 Hz power frequency and its harmonics (such as 100 Hz, 150 Hz, etc.) through frequency domain analysis, and use a variable band-stop filter (such as IIR or FIR filter) to dynamically adjust the center frequency and bandwidth (such as ±5% harmonic frequency). Use the LMS algorithm (least mean square algorithm) to track the change of harmonic frequency points in real time and update the filter parameters. Impulse noise suppression: Detect impulse noise (such as switching power supply, motor startup 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 band-pass filters respectively. For the low-frequency band (0.1 - 3 MHz), retain the power frequency fundamental wave and suppress harmonics; For the high-frequency band (3 MHz - 30 MHz), retain the communication frequency band and suppress impulse noise; Step 104: Mark the conflicting frequency bands occupied by Wi-Fi and Bluetooth to generate the available wireless spectrum; Specifically, the energy detection method is used to detect the energy of each sub - band of the wireless signal. A threshold value (such as - 70dBm) is set. The sub - bands with energy higher than the threshold value are marked as occupied. The occupied sub - bands of Wi - Fi and Bluetooth are identified through cyclic stationary detection and marked as conflict sub - bands. A wireless available spectrum map is generated according to the conflict marks, and the availability (available / occupied / conflict) of each sub - band is marked. The setting of the threshold needs to be adjusted according to the specific application scenario to ensure that the setting does not affect the detection effect. During use, combine the content of steps 101 to 104: 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 an adaptive notch filter can dynamically filter out power frequency harmonics and pulse noise, effectively improving the transmission quality of the power line carrier signal. By marking the conflict sub - bands and generating a wireless available spectrum map, it is possible to select sub - bands that are not occupied or have less interference for communication, thereby improving the utilization rate of the wireless spectrum and reducing spectrum conflicts and interference.

[0023] Step 2: Separate multiple power line basic modes from the power line carrier signal, evaluate the orthogonality loss degree and phase shift of each power line basic mode, and select the effective power line modes after modal effectiveness determination. Combine the orthogonality loss degree and phase shift of the effective power line modes into a power line feature vector. The above - mentioned step 2 includes the following content: Step 201: Detect the local maximum value (credible channel) and minimum value (interference region) of the amplitude of each phase of the power line carrier signal, use cubic spline interpolation to generate a credible transmission envelope and an interference suppression envelope, and calculate the envelope mean line through the credible transmission envelope and the interference suppression envelope: , where represents the envelope mean line, t represents time, represents the credible transmission envelope, represents the interference suppression envelope; Step 202: According to the envelope mean line, use methods such as Hilbert - Huang transform (HHT) or empirical mode decomposition (EMD) to decompose the power line carrier signal into multiple power line basic modes PLC - IMF. For each power line basic mode, obtain the orthogonality loss degree by calculating the cross - correlation coefficient with other power line basic modes: , where represents the orthogonality loss degree of the i th power line basic mode, and respectively represent the i th and the j th power line basic modes, Corr ( ) represents the cross-correlation coefficient between two power line basic modes, , , and ; Step 203: Select a power line basic mode as the reference mode, including: calculating the energy of each power line basic mode: , where represents the energy of the i th power line basic mode, Fs represents the sampling frequency, f represents the frequency point, FFT( ) represents the fast Fourier transform, sort according to the energy from high to low, and select the one with the lowest orthogonality loss degree among the first several power line basic modes (such as the first 5) as the reference mode; When calculating the energy in the frequency domain, when the frequency point f takes 0, it 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 sum from the first non-zero frequency, that is, the frequency point f takes the minimum non-zero frequency, usually the first positive frequency component; Step 204: For each power line basic mode, calculate its phase offset relative to the reference mode: , where represents the phase offset, F {} represents the Fourier transform, and the arg( ) function returns the phase angle of the complex number; Step 205: Preset the loss degree threshold and the offset threshold, select the power line basic modes with the orthogonality loss degree less than the loss degree threshold and the phase offset less than the offset threshold as the power line effective modes, and combine the orthogonality loss degree and the phase offset of the power line effective modes into the power line feature vector: , where represents the power line feature vector, n represents the number of power line effective modes; when setting the loss degree threshold and the offset degree threshold, adjust according to the actual effect, and it is necessary to ensure that the selected power line effective modes are as independent as possible from other power line effective modes to ensure signal synchronization and stability; When using, combine the content of steps 201 to 205: By separating multiple power line base modes and selecting modes with low orthogonal loss and small phase shift 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 mode effectiveness screening process ensures that only high-quality power line base modes are used for communication, thus avoiding unnecessary resource waste and helping to achieve more efficient data transmission within the limited power line bandwidth.

[0024] Step 3: Based on the wireless available spectrum map, generate wireless base modes, calculate the delay spread and spectral efficiency of each wireless base mode, perform admission condition screening, select wireless effective modes, and combine the delay spread and spectral efficiency of the wireless effective modes into a wireless feature vector; The said Step 3 includes the following contents: Step 301: Based on the wireless available spectrum map (indicating occupied / conflicting frequency bands) generated in Step 1, divide the available frequency bands that are not marked as conflicting or occupied into multiple sub-channels. When dividing, set the sub-channel bandwidth according to the application scenario requirements (such as 200 kHz or smaller). If there is local interference (such as burst noise) within the sub-channel, further subdivide the bandwidth to isolate the interference area, ensuring that the frequency bands of adjacent sub-channels are continuous and avoiding spectrum fragmentation; Step 302: Transmit a predefined test signal (such as a pseudo-random sequence) through software-defined radio (SDR), 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 the preset signal strength threshold (such as -70 dBm) and the bit error rate is lower than the preset bit error rate threshold (such as ), then mark it as an available sub-channel; otherwise, mark it as an interfering sub-channel; The preset signal strength threshold is used to judge whether the received signal strength (RSSI) of the sub-channel is high enough to ensure communication quality. Usually, the signal strength threshold is set according to the ambient noise level and the desired communication reliability; the preset bit error rate threshold is used to measure whether the bit error rate (BER) of the sub-channel is within the acceptable range. The lower the bit error rate, the higher the communication quality. The setting of the bit error rate threshold needs to comprehensively consider the requirements of the communication system and the noise characteristics of the application scenario; Step 303: Combine adjacent available sub-channels into a continuous frequency band to form a wireless base mode RF-IMF. If there is local interference within the combined frequency band (such as a single sub-channel being marked as an interfering frequency band), then only retain the non-interfered part of the sub-channel; Step 304: For each wireless base mode, measure its delay spread (the range of delay differences in signal propagation) through the channel impulse response (CIR). The formula is: , where represents the delay spread, and respectively represent the latest and earliest time delays when the signal arrives; Step 304: For each wireless basic mode, combine the channel bandwidth and signal-to-noise ratio (SNR) to calculate the spectral efficiency. The formula is: , where η represents the spectral efficiency, B represents the channel bandwidth, P represents the signal power, represents the noise power; Step 305: Screen the admission conditions for each wireless basic mode. Preset the time delay threshold and efficiency threshold, and only retain the wireless basic modes that simultaneously satisfy that the delay spread is less than the time delay threshold and the spectral efficiency is greater than the efficiency threshold as the wireless effective modes. Combine the delay spread and spectral efficiency of the wireless effective modes into a wireless feature vector: , where represents the wireless feature vector, m represents the number of wireless effective modes; The time delay threshold is used to screen the delay spread of the wireless basic mode. The smaller the delay spread, the smaller the time delay difference of signal propagation, and the more stable the performance of the communication system. The setting of the time delay threshold needs to be determined according to the time delay tolerance of the communication system and the transmission requirements of the application scenario; the efficiency threshold is used to measure whether the spectral efficiency of the wireless basic mode reaches the expected level. The higher the spectral efficiency, the more information can be transmitted within a given bandwidth. The setting of the efficiency threshold needs to comprehensively consider the bandwidth requirements of the communication system and the utilization efficiency of the spectrum resources; When in use, combine the content of Steps 301 to 305: By marking the available sub-channels and interfering sub-channels, it helps to avoid using sub-channels with poor performance during the communication process, thereby improving the stability and reliability of the communication. By measuring the delay spread of each wireless basic mode and calculating the spectral 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 the wireless effective modes, which helps to screen out the wireless basic modes with excellent performance and improve the overall performance of the communication system.

[0025] Step Four: Construct a similarity matrix through the power line and the wireless feature vector, use the similarity matrix as the cost matrix, with the goal of maximizing the total throughput, match the optimal mode pairs of the power line effective modes and the wireless effective modes, generate a joint constellation diagram according to the matching result, and determine the modulation method.

[0026] The said Step Four includes the following content: Step 401: Construct a similarity matrix through the power line feature vector and the wireless feature vector. The calculation formula for the elements in the similarity matrix is: , where represents an element in the similarity matrix, where n is the row in the similarity matrix and m is the column in the similarity matrix. represents the power line weight. , represents the wireless weight. , and Softmax( ) is the Softmax function; Step 402: Take the similarity matrix as the cost matrix and apply the Hungarian algorithm to find the optimal mode pairs of the power line effective mode and the wireless effective mode, with the goal of maximizing the total throughput: , and the matching results form a mode pair list; Step 403: For the successfully matched mode pairs, generate a joint constellation diagram based on the power line eigenvector and the wireless eigenvector: If the orthogonality loss degree is less than 0.1 (good orthogonality), QPSK modulation is used on the power line side, otherwise, BPSK modulation is used; If the spectral efficiency is greater than 6 (bit / s / Hz), 64-QAM modulation is used on the wireless side, otherwise, 16-QAM modulation is used. Generate a 64- or 256-point constellation diagram through the Cartesian product. The unmatched power line effective modes directly use BPSK modulation, and the wireless effective modes use QPSK modulation to ensure the basic communication reliability; When in use, combine the content of Step 401 to Step 403: By constructing the similarity matrix and applying the Hungarian algorithm, the power line effective mode and the wireless effective mode can be optimally matched, thereby realizing the optimal allocation of communication resources, considering the characteristics of the power line and wireless channels, contributing to maximizing the total throughput, improving the communication efficiency, and reducing the bit error rate in the communication process through mode matching and modulation method selection.

[0027] An electronic device 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 power line carrier and wireless dual-mode fusion provided by any one of the above methods.

[0028] 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 power line carrier and wireless dual-mode fusion provided by any one of the above methods.

[0029] The above formulas are all dimensionless and take their numerical values for calculation. The formulas are obtained by collecting a large amount of data for software simulation to get a formula closest to the real situation. The preset parameters, weights, and threshold selections in the formulas are set by those skilled in the art according to the actual situation.

[0030] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. 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 includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted 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 that can be accessed by a computer or a data storage device such as a server or data center that includes one or more collections of available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media. The semiconductor media can be a solid-state drive.

[0031] Those of ordinary skill in the art will appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution.

[0032] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units. They can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0033] As described above, the above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all of them should be covered by the protection scope of this application.

Claims

1. A communication method that fuses power line carrier and wireless dual-mode, characterized in that: Including: Synchronously collect three-phase power line carrier signals and wireless signals to generate a wireless available spectrum map; Separate multiple power line basic modes from the power line carrier signals. After modal validity determination, screen out the power line effective modes, and combine the orthogonality loss degree and phase shift of the power line effective modes into a power line feature vector; Based on the wireless available spectrum map, generate wireless basic modes, perform access condition screening, screen out wireless effective modes, and combine the delay spread and spectral efficiency of the wireless effective modes into a wireless feature vector; Construct a similarity matrix, use the similarity matrix as a cost matrix to match the optimal mode pairs of the power line effective modes and the wireless effective modes, generate a joint constellation map according to the matching result, and determine the modulation method.

2. The communication method for power line carrier and wireless dual-mode fusion according to claim 1, characterized in that: Perform energy detection on each sub-band of the wireless, mark the bands with energy higher than the threshold as the conflict state, identify the occupied bands through cyclic stationary detection, mark them as the occupied state, generate a wireless available spectrum map according to the marks, and mark the availability of each sub-band, including available, occupied, and conflict.

3. A communication method of power line carrier and wireless dual-mode fusion according to claim 1, characterized in that: Separate multiple power line basic modes, including: Detect the amplitude local maxima and minima of each phase of the power line carrier signal, use cubic spline interpolation to generate a credible transmission envelope line and an interference suppression envelope line, calculate the mean value of the credible transmission envelope line and the interference suppression envelope line to obtain an envelope mean line; according to the envelope mean line, use empirical mode decomposition to decompose the power line carrier signal into multiple power line basic modes.

4. A 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 cross-correlation coefficients with other power line fundamental modes ; Select a power line fundamental mode as the reference mode. For each power line fundamental mode, calculate its phase shift relative to the reference mode : , where represents the i th power line fundamental mode, is the reference mode, F {} is the Fourier transform; Select the power line basic modes with an orthogonality loss degree less than the loss degree threshold and a phase shift less than the offset threshold as the power line effective modes.

5. A communication method of power line carrier and wireless dual-mode fusion according to claim 1, characterized in that: Generate wireless basic modes, including: Based on the generated wireless available spectrum map, divide the available bands not marked as conflict or occupied into multiple sub-channels, measure the received signal strength and bit error rate of the sub-channels. 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, mark it as an available sub-channel, otherwise, mark it as an interference sub-channel, and merge adjacent available sub-channels into continuous bands to form wireless basic modes.

6. The communication method of power line carrier and wireless dual-mode fusion according to claim 5, characterized in that: Perform access condition screening, including: For each wireless basic mode, measure the delay spread through the channel impulse response , and calculate the spectral efficiency by combining the channel bandwidth and the signal-to-noise ratio η : , where B is the channel bandwidth, P is the signal power, is the noise power; Only retain the wireless basic modes that simultaneously satisfy the conditions of having a delay spread less than the delay threshold and a spectral efficiency greater than the efficiency threshold as the wireless effective modes.

7. A communication method for power line carrier and wireless dual-mode fusion according to claim 1, characterized in that: Construct a similarity matrix, use the similarity matrix as a cost matrix to match the optimal mode pairs of the power line effective modes and the wireless effective modes, including: Construct a similarity matrix through the power line feature vector and the wireless feature vector. The elements in the similarity matrix : , where n is the number of effective modes of the power line, m is the number of effective modes of the wireless, is the power line weight, is the wireless weight, is the orthogonality loss degree, is the phase offset, is the spectral efficiency, and is the delay spread; Taking the similarity matrix as the cost matrix, the Hungarian algorithm is applied to find the optimal mode pairs between the effective modes of power lines and the effective modes of wireless, with the goal of maximizing the total throughput: , and the matching results form a list of mode pairs.

8. A communication method for the integration of power line carrier and wireless dual-mode, according to claim 7, characterized in that: Generate a joint constellation map according to the matching result, and determine the modulation method, including: For the successfully matched modal pairs, a joint constellation diagram is generated based on the power line feature vector and the wireless feature vector: If the orthogonality loss degree is less than 0.1, QPSK modulation is used on the power line side; otherwise, BPSK modulation is used. If the spectral 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. For the unmatched effective power line modes, BPSK modulation is directly used, and for the wireless effective modes, QPSK modulation is used.

9. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements a communication method for power line carrier and wireless dual-mode fusion according to any one of claims 1-8.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program is executed, it implements a communication method for power line carrier and wireless dual-mode fusion according to any one of claims 1-8.

Images