Power line carrier signal transmission method and device based on multiple-input multiple-output system
By analyzing three-phase signals to identify communication modes and calculating signal-to-noise ratio data, and generating switch status commands to control the opening and closing of the receiving port, the problem of excessive power consumption in power line carrier communication of multiple-input multiple-output systems is solved, achieving a balance between performance and power consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
- Filing Date
- 2026-03-20
- Publication Date
- 2026-06-26
AI Technical Summary
Existing power line carrier communication systems in multiple-input multiple-output systems consume excessive power under high-performance requirements, making it difficult to balance performance and power consumption.
By analyzing the three-phase signal sent by the transmitter, the current communication mode is identified, the signal-to-noise ratio (SNR) data is calculated, and a switch state command is generated based on the SNR and a preset threshold to control the opening and closing of the receiving port, thereby intelligently shutting down the RF power consumption of redundant channels.
In single-stream mode, based on real-time channel quality, inferior channels are intelligently shut down while high-quality channels are retained to maintain communication performance, significantly reducing the overall power consumption of the multiple-input multiple-output receiver.
Smart Images
Figure CN122293449A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of carrier communication and relates to a method and apparatus for power line carrier signal transmission based on a multiple-input multiple-output system. Background Technology
[0002] Power line carrier communication uses power lines as the signal transmission medium. In three-phase power supply systems, multiple-input multiple-output (MIMO) technology is often used to improve communication reliability or throughput.
[0003] However, regardless of whether a MIMO system operates in single-stream or multi-stream mode, all three RF front-ends must operate at full power for extended periods, significantly increasing the RF power consumption at the receiver and resulting in excessively high static power consumption. Balancing low power consumption with high performance is a critical problem that needs to be solved in power line carrier communication based on MIMO systems. Summary of the Invention
[0004] This application provides a power line carrier signal transmission method and apparatus based on a multiple-input multiple-output (MIMO) system, which can solve the problem that multiple-input multiple-output systems in the prior art are difficult to balance performance and power consumption.
[0005] To achieve the above objectives, in a first aspect, the present invention provides a power line carrier signal transmission method based on a multiple-input multiple-output system, applicable to the receiving end of a power line carrier signal transmission device, comprising: Receive and parse the three-phase signal sent by the transmitter to obtain the data stream mode identifier; The current communication mode is identified based on the data stream mode identifier. When the current communication mode is a single-stream mode, the signal-to-noise ratio data of each phase signal is calculated. Each signal-to-noise ratio data is compared with a preset threshold, and the switching state command data of the receiving port corresponding to each phase line is generated based on the comparison results. Based on the switch status command data, control the opening and closing of the receiving port of the corresponding phase line.
[0006] Compared to existing technologies, the embodiments of this application have the following beneficial effects: parsing the three-phase signals yields a data stream mode identifier, identifying the current communication mode; further, by determining whether the identifier indicates a single-stream mode, subsequent processing is triggered, ensuring that the energy-saving strategy is activated only in applicable scenarios; simultaneously, by calculating the signal-to-noise ratio (SNR) data of each phase signal in single-stream mode, a quantitative basis for dynamic port configuration is provided; then, comparing each SNR data with a preset threshold generates switch state command data, establishing a mapping relationship between channel quality and power consumption control; and controlling the opening and closing of the corresponding phase line receiving port according to the command data can directly cut off the RF power consumption of redundant channels; the synergistic effect of the above features enables the system to intelligently shut down inferior channels based on real-time channel quality in single-stream mode, preserving high-quality channels to maintain communication performance while significantly reducing the overall power consumption of the multi-input multi-output receiver, thereby effectively solving the core problem of difficulty in balancing performance and power consumption in existing technologies.
[0007] In some embodiments of the first aspect of this application, the process of parsing the three-phase signal transmitted by the transmitting end to obtain the data stream mode identifier includes: Extract the frame control field from the frame header of the three-phase signal; The frame control field is decoded to obtain a data stream mode identifier that indicates single-stream mode or multi-stream mode.
[0008] Compared with the prior art, the above embodiments have the following advantages: extracting the frame control field from the three-phase signal frame header and decoding the field to obtain the data stream mode identifier utilizes the inherent control information structure in the communication protocol, ensuring the reliability and compatibility of pattern recognition and avoiding additional signaling overhead.
[0009] In some embodiments of the first aspect of this application, the calculation of the signal-to-noise ratio data of each phase signal includes: Perform timing synchronization and carrier synchronization on each phase signal to obtain synchronized phase signals; Extract pilot symbols from each phase signal after synchronization, and calculate the signal power and noise power of each phase line based on the pilot symbols; The signal-to-noise ratio (SNR) of each phase signal is calculated based on the signal power and noise power of each phase line.
[0010] Compared with existing technologies, the above embodiments have the following advantages: by performing timing synchronization and carrier synchronization on each phase signal to obtain synchronized signals, a time-frequency alignment foundation is laid for subsequent channel parameter estimation; furthermore, pilot symbols are extracted from the synchronized signals and signal power and noise power are calculated based on them, utilizing the known characteristics of pilot symbols to achieve channel energy separation; then, signal-to-noise ratio data is calculated based on signal power and noise power, providing objective indicators reflecting the independent channel quality of each phase line, supporting the accuracy of subsequent port selection.
[0011] In some embodiments of the first aspect of this application, the calculation of the signal power and noise power of each phase based on the pilot symbols includes: Energy integration is performed on the pilot symbols to obtain the signal power of each phase; The signal amplitude is sampled on the idle subcarriers between pilot symbols, and the noise power of each phase is calculated based on the signal amplitude.
[0012] Compared with the prior art, the above embodiments have the following beneficial effects: by integrating the energy of the pilot symbols to obtain the signal power, the characteristic of concentrated energy of the pilot symbols is utilized to achieve accurate capture of the signal components; at the same time, the signal amplitude is sampled on the idle subcarriers between the pilot symbols to obtain the noise power, and the characteristic of no signal transmission on the idle subcarriers is utilized to achieve unbiased estimation of the noise floor, thereby improving the accuracy of signal-to-noise ratio calculation.
[0013] In some embodiments of the first aspect of this application, the step of comparing each of the signal-to-noise ratio data with a preset threshold and generating switch state command data for the receiving port corresponding to each phase line based on the comparison results includes: Determine whether the signal-to-noise ratio of each phase signal is greater than or equal to a preset threshold. If it is greater than or equal to the threshold, the result is true; otherwise, it is false, and the compliance status of each phase line is obtained. If only one phase line meets the standard, then a switch status command data is generated indicating that the receiving port of that phase line is open and the receiving ports of the other phase lines are closed. If multiple phase lines meet the standard and are true, then select the phase line with the highest signal-to-noise ratio and generate switch status command data that enables the receiving port of that phase line and disables the receiving ports of the other phase lines. If the compliance status of all phase lines is false, calculate the combined signal-to-noise ratio (SNR) of any two-phase combination and determine whether there is a phase line combination with a combined SNR greater than or equal to a preset threshold. If so, generate switch status command data indicating that the receiving ports of two phase lines in the combination are open and the receiving port of the remaining phase line is closed. If the combined SNR of all two-phase combinations is less than the preset threshold, generate switch status command data indicating that the receiving ports of all phase lines are open.
[0014] Compared to existing technologies, the above embodiments have the following advantages: They determine whether the signal-to-noise ratio (SNR) of each phase signal is greater than or equal to a preset threshold to obtain a compliance status, establishing a threshold-based channel quality screening mechanism; if only one phase line meets the standard, that port is opened while the others are closed, achieving minimum power consumption configuration while meeting communication requirements; if multiple phase lines meet the standard, the one with the highest SNR is selected and the others are closed, ensuring that the optimal single channel is prioritized to improve link robustness; if all phases fail to meet the standard, the combined SNR value of any two-phase combination is calculated and it is determined whether a compliant combination exists, utilizing multi-channel signal combining gain to mine potential usable channels; if a compliant two-phase combination exists, the ports of those two phases are opened while the remaining phase is closed, ensuring reception reliability while avoiding the high power consumption of all three phases being open; if all two-phase combinations fail to meet the standard, all phase line ports are opened, ensuring communication continuity under extremely poor channel conditions through maximum diversity; overall, a three-level adaptive port configuration strategy covering single-channel, dual-channel, and full-channel configurations is formed, significantly improving the balance between power consumption and performance.
[0015] In some embodiments of the first aspect of this application, the preset threshold is dynamically adjusted based on the historical noise level of the power line channel.
[0016] Compared with the prior art, the above embodiments have the following beneficial effects: setting the preset threshold as a parameter that is dynamically adjusted according to the historical noise level of the power line channel can adapt to changes in environmental noise, avoid false shutdown or missed shutdown caused by fixed thresholds in different noise scenarios, and improve the environmental adaptability and long-term stability of the port control strategy.
[0017] In some embodiments of the first aspect of this application, controlling the opening and closing of the receiving port of the corresponding phase line according to the switch state command data includes: When the switch status command data indicates that the receiving port of a certain phase line is turned on, the power supply of the low noise amplifier and mixer of the radio frequency front end of that phase line is started, so that it enters the working state. When the switch status command data indicates that a certain phase line receiving port is closed, the power supply to the low-noise amplifier and mixer of the RF front end of that phase line is cut off, causing it to enter the off state.
[0018] Compared with the prior art, the above embodiments have the following beneficial effects: by starting the power supply of the low-noise amplifier and mixer of the phase line RF front end under the start command and cutting off its power supply under the stop command, the power state of the core active devices of the RF front end is directly controlled, realizing the power consumption cut-off at the physical level of the receiving port, and ensuring the real measurability of the energy saving effect.
[0019] In some embodiments of the first aspect of this application, if the communication mode corresponding to the data stream mode identifier is a multi-stream mode, then the receiving ports of all phase lines are kept open.
[0020] Compared with the prior art, the above embodiments have the following beneficial effects: by keeping all phase line receiving ports open when the data stream mode identifier indicates multi-stream mode, the basic principle that multi-stream MIMO communication requires full-channel operation is strictly followed, avoiding data stream loss due to incorrect port closure, and ensuring the integrity of communication in multi-stream mode.
[0021] In some embodiments of the first aspect of this application, the three-phase signal is three independent signals transmitted through the A-phase, B-phase, and C-phase power lines respectively.
[0022] Compared with existing technologies, the above embodiments have the following advantages: they clarify the application scenarios and define the physical implementation boundaries of the technical solutions.
[0023] Secondly, the present invention also provides a power line carrier signal transmission device based on a multiple-input multiple-output system, comprising: a transmitting end and a receiving end; The transmitting end is used to transmit three-phase signals to the receiving end; The receiving end is used to execute any of the above-described power line carrier signal transmission methods based on a multiple-input multiple-output system.
[0024] Compared with the prior art, the above embodiments of this application have the following beneficial effects: parsing the three-phase signal to obtain the data stream mode identifier, identifying the current communication mode; further, by determining whether the identifier indicates a single-stream mode to trigger subsequent processing, ensuring that the energy-saving strategy is activated only in applicable scenarios; simultaneously, by calculating the signal-to-noise ratio data of each phase signal in single-stream mode, providing a quantitative basis for dynamic port configuration; then comparing each signal-to-noise ratio data with a preset threshold to generate switch state command data, establishing a mapping relationship between channel quality and power consumption control; and controlling the opening and closing of the corresponding phase line receiving port according to the command data, which can directly cut off the RF power consumption of redundant channels; the synergistic effect of the above features enables the system to intelligently shut down inferior channels based on real-time channel quality in single-stream mode, which not only preserves high-quality channels to maintain communication performance, but also significantly reduces the overall power consumption of the multi-input multi-output receiver, thereby effectively solving the core problem of difficulty in balancing performance and power consumption in the prior art. Attached Figure Description
[0025] Figure 1 This is a flowchart illustrating a power line carrier signal transmission method based on a multiple-input multiple-output system provided in some embodiments of the present invention.
[0026] Figure 2 This is a schematic diagram of the receiver end of a power line carrier signal transmission device based on a multiple-input multiple-output system provided in some embodiments of the present invention.
[0027] Figure 3 This is a schematic diagram of a bitloading training frame signal structure provided in some embodiments of the present invention. Detailed Implementation
[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0029] Example 1: Please refer to Figure 1 To address the problem of balancing performance and power consumption in existing multiple-input multiple-output (MIMO) systems, an embodiment of the present invention provides a power line carrier signal transmission method based on a MIMO system, applicable to the receiving end of a power line carrier signal transmission device, comprising steps S1 to S4: Step S1: Receive and parse the three-phase signal sent by the transmitter to obtain the data stream mode identifier; Step S2: Identify the current communication mode based on the data stream mode identifier. When the current communication mode is a single-stream mode, calculate the signal-to-noise ratio data of each phase signal. Step S3: Compare each of the signal-to-noise ratio data with a preset threshold, and generate the switching state command data of the receiving port corresponding to each phase line based on the comparison results; Step S4: Control the opening and closing of the receiving port of the corresponding phase line according to the switch status command data.
[0030] Furthermore, step S1 can be implemented through the following preferred embodiments, including steps S11-S12, as follows: S11: Extract the frame control field from the frame header of the three-phase signal; S12: Decode the frame control field to obtain a data stream mode identifier that indicates single-stream mode or multi-stream mode.
[0031] In this preferred embodiment, the frame control field is extracted from the three-phase signal frame header and the data stream mode identifier is obtained by decoding the field. This utilizes the inherent control information structure in the communication protocol, ensuring the reliability and compatibility of pattern recognition and avoiding additional signaling overhead.
[0032] Furthermore, in step S2, calculating the signal-to-noise ratio data of each phase signal can be implemented through the following preferred embodiments, including steps S21-S23, as follows: S21: Perform timing synchronization and carrier synchronization on each phase signal to obtain synchronized phase signals; S22: Extract pilot symbols from each phase signal after synchronization, and calculate the signal power and noise power of each phase line based on the pilot symbols; S23: Calculate the signal-to-noise ratio data of each phase signal based on the signal power and noise power of each phase line.
[0033] In this preferred embodiment, synchronized signals are obtained by performing timing synchronization and carrier synchronization on each phase signal, laying the time-frequency alignment foundation for subsequent channel parameter estimation; pilot symbols are further extracted from the synchronized signal and signal power and noise power are calculated based on them, utilizing the known characteristics of pilot symbols to achieve channel energy separation; then, signal-to-noise ratio data are calculated based on signal power and noise power, providing objective indicators reflecting the independent channel quality of each phase line, supporting the accuracy of subsequent port selection.
[0034] Furthermore, step S22 can be implemented through the following preferred embodiments, including steps S221-S222, as follows: S221: Integrate the energy of the pilot symbols to obtain the signal power of each phase; S222: Sample the signal amplitude on the idle subcarrier between pilot symbols, and calculate the noise power of each phase based on the signal amplitude.
[0035] In this preferred embodiment, the signal power is obtained by integrating the energy of the pilot symbols, which utilizes the characteristic of concentrated energy in the pilot symbols to achieve accurate capture of the signal components; at the same time, the signal amplitude is sampled on the idle subcarriers between the pilot symbols to obtain the noise power, which utilizes the characteristic of no signal transmission on the idle subcarriers to achieve unbiased estimation of the noise floor, thereby improving the accuracy of the signal-to-noise ratio calculation.
[0036] Furthermore, step S3 can be implemented through the following preferred embodiments, including steps S31-S32, as follows: S31: Determine whether the signal-to-noise ratio of each phase signal is greater than or equal to the preset threshold. If it is greater than or equal to the preset threshold, it is true; otherwise, it is false, and the compliance status of each phase line is obtained. S32: If only one phase line has a true compliance status, generate switch status command data indicating that the receiving port of that phase line is open and the receiving ports of the other phase lines are closed; if multiple phase lines have true compliance status, select the phase line with the largest signal-to-noise ratio (SNR) and generate switch status command data indicating that the receiving port of that phase line is open and the receiving ports of the other phase lines are closed; if all phase lines have false compliance status, calculate the combined SNR value of any two-phase combination and determine whether there is a phase line combination with a combined SNR value greater than or equal to a preset threshold; if so, generate switch status command data indicating that the receiving ports of two phase lines in that combination are open and the receiving port of the remaining phase line is closed; if the combined SNR value of all two-phase combinations is less than the preset threshold, generate switch status command data indicating that the receiving ports of all phase lines are open.
[0037] In this preferred embodiment, a threshold-based channel quality screening mechanism is established by determining whether the signal-to-noise ratio (SNR) of each phase signal is greater than or equal to a preset threshold. If only one phase line meets the standard, that port is opened while the others are closed, achieving minimum power consumption configuration while meeting communication requirements. If multiple phase lines meet the standard, the one with the highest SNR is selected and the others are closed, ensuring that the optimal single channel is prioritized to improve link robustness. If none meet the standard, the combined SNR value of any two-phase combination is calculated and it is determined whether there is a compliant combination, utilizing the multi-channel signal combining gain to mine potential usable channels. If there is a compliant two-phase combination, the ports of those two phases are opened while the remaining phase is closed, ensuring reception reliability while avoiding the high power consumption of all three phases being open. If all two-phase combinations do not meet the standard, all phase line ports are opened, ensuring communication continuity under extremely poor channel conditions through maximum diversity. Overall, a three-level adaptive port configuration strategy covering single-channel, dual-channel, and full-channel configurations is formed, significantly improving the balance between power consumption and performance.
[0038] Furthermore, the preset threshold is dynamically adjusted based on the historical noise level of the power line channel.
[0039] In this preferred embodiment, the preset threshold is set as a parameter that is dynamically adjusted according to the historical noise level of the power line channel. This can adapt to changes in environmental noise, avoid false shutdowns or missed shutdowns caused by fixed thresholds in different noise scenarios, and improve the environmental adaptability and long-term stability of the port control strategy.
[0040] Furthermore, step S4 can be implemented through the following preferred embodiments, including steps S41-S42, as follows: S41: When the switch status command data indicates that the receiving port of a certain phase line is turned on, start the power supply of the low noise amplifier and mixer of the radio frequency front end of that phase line, so that it enters the working state. S42: When the switch status command data indicates that a certain phase line receiving port is closed, the power supply to the low noise amplifier and mixer of the RF front end of that phase line is cut off, so that it enters the off state.
[0041] In this preferred embodiment, by activating the power supply of the low-noise amplifier and mixer of the phase line RF front-end under the enable command and shutting it off under the disable command, the power state of the core active components of the RF front-end is directly controlled, thereby achieving power cut-off at the physical level of the receiving port and ensuring the real measurability of the energy-saving effect.
[0042] Preferably, this method further includes step S5, as follows: S5: If the communication mode corresponding to the data stream mode identifier is multi-stream mode, then keep the receiving ports of all phase lines open.
[0043] In this preferred embodiment, by keeping all phase line receiving ports open when the data stream mode identifier indicates multi-stream mode, the basic principle that multi-stream MIMO communication requires full-channel operation is strictly followed, avoiding data stream loss due to incorrect port closure and ensuring communication integrity in multi-stream mode.
[0044] Preferably, the three-phase signal is three independent signals transmitted through the A-phase, B-phase, and C-phase power lines respectively.
[0045] In summary, compared with the prior art, the above embodiments of this application have the following beneficial effects: parsing the three-phase signals to obtain the data stream mode identifier, identifying the current communication mode; further, by determining whether the identifier indicates a single-stream mode to trigger subsequent processing, ensuring that the energy-saving strategy is activated only in applicable scenarios; simultaneously, by calculating the signal-to-noise ratio (SNR) data of each phase signal in single-stream mode, providing a quantitative basis for dynamic port configuration; then, comparing each SNR data with a preset threshold to generate switch state command data, establishing a mapping relationship between channel quality and power consumption control; and controlling the opening and closing of the corresponding phase line receiving port according to the command data, directly cutting off the RF power consumption of redundant channels; the synergistic effect of the above features enables the system to intelligently shut down inferior channels based on real-time channel quality in single-stream mode, preserving high-quality channels to maintain communication performance while significantly reducing the overall power consumption of the multi-input multi-output receiver, thereby effectively solving the core problem of difficulty in balancing performance and power consumption in the prior art.
[0046] Example 2: Based on the same inventive concept, the present invention discloses a power line carrier signal transmission device based on a multiple input multiple output system, comprising: a transmitting end and a receiving end; The transmitting end is used to transmit three-phase signals to the receiving end; The receiving end is used to execute any of the power line carrier signal transmission methods based on a multiple-input multiple-output system as described in Embodiment 1 above.
[0047] In specific implementation, refer to Figure 2 The diagram shows a receiver of a power line carrier signal transmission device based on a multiple-input multiple-output (MIMO) system. The receiver includes multiple receiving ports, which can simultaneously receive signals from multiple ports. Figure 3 This is a bitloading training frame signal structure used for channel measurement of signals. When it is necessary to measure the channel conditions from the transmitter to the receiver, the transmitter sends... Figure 3 The frame signal format is as follows: sync and FC represent specific frequency band ranges. sync is the synchronization signal used for synchronization; FC is the frame control signal, carrying information such as TF and payload lengths, signal stream number, and TMI. Each OFDM symbol in the TF and payload is a full-band symbol (i.e., in the frequency domain, each symbol includes all subcarriers used in the communication protocol). The TF contains a fixed number of OFDM symbols (usually 10 symbols), and the payload is also a training symbol used for channel evaluation. Its number can be adjusted according to the actual situation (it can be configured with a maximum of 128 symbols). Due to the large number of TF+payload symbols and the fact that they are full-band symbols, continuous reception and processing by three receiver ports will significantly increase RF power consumption (for example, each receiver port needs to be independently configured with RF front-end modules such as low-noise amplifiers and mixers. When all ports are turned on at the same time, these modules need to continuously process signals, resulting in power consumption accumulation). On the other hand, multi-port signal processing needs to share part of the baseband processor (ADC, etc.), which may require time-division multiplexing, thus increasing processing latency.
[0048] After successful synchronization, the current signal flow (FC) of each phase line is analyzed to obtain parameters such as the current signal flow count and TMI. The FC in the communication protocol carries relevant control information, including the signal flow count and TMI parameters. In this application, the flow count includes Flow 1 (single-flow mode) and Flow 2 (multi-flow mode). Flow 1 indicates that all three phase lines transmit the same signal; Flow 2 indicates that the phase lines transmit different signals.
[0049] If the current signal stream is digital stream 1 (single stream mode), then the ports used for signal reception are determined based on the signal-to-noise ratio of each phase line and the TMI threshold (i.e., the preset threshold).
[0050] Specifically, if the SNR value of a certain phase line is greater than or equal to the TMI threshold, the port corresponding to that phase line continues to receive signals, while the other ports are turned off.
[0051] If the SNR values of multiple phase lines are greater than or equal to the TMI threshold, the port with the highest SNR value will be used for reception, and the other ports will be turned off. If the SRN value of each of the three phase lines is less than the TMI threshold, then the SNR of any two phase lines is combined and compared. If the combined SNR value of two phase lines is greater than or equal to the TMI threshold, then those two phase lines are used to receive signals, and the other port is turned off. If any two merged SNRs are less than the TMI threshold, then all three phase line ports will receive the signal.
[0052] Through the above implementation, under good channel conditions, the receiver can selectively shut down the receiver port, thereby reducing the receiver's RF power consumption.
[0053] In summary, compared with the prior art, the embodiments of this application have the following beneficial effects: parsing the three-phase signals to obtain the data stream mode identifier, identifying the current communication mode; further, by determining whether the identifier indicates a single-stream mode to trigger subsequent processing, ensuring that the energy-saving strategy is activated only in applicable scenarios; simultaneously, by calculating the signal-to-noise ratio (SNR) data of each phase signal in single-stream mode, providing a quantitative basis for dynamic port configuration; then, comparing each SNR data with a preset threshold to generate switch state command data, establishing a mapping relationship between channel quality and power consumption control; and controlling the opening and closing of the corresponding phase line receiving port according to the command data, directly cutting off the RF power consumption of redundant channels; the synergistic effect of the above features enables the system to intelligently shut down inferior channels based on real-time channel quality in single-stream mode, preserving high-quality channels to maintain communication performance while significantly reducing the overall power consumption of the multi-input multi-output receiver, thereby effectively solving the core problem of difficulty in balancing performance and power consumption in the prior art.
[0054] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.
Claims
1. A method for transmitting power line carrier signals based on a multiple-input multiple-output system, characterized in that, A receiver suitable for power line carrier signal transmission devices includes: Receive and parse the three-phase signal sent by the transmitter to obtain the data stream mode identifier; The current communication mode is identified based on the data stream mode identifier. When the current communication mode is a single-stream mode, the signal-to-noise ratio data of each phase signal is calculated. Each signal-to-noise ratio data is compared with a preset threshold, and the switching state command data of the receiving port corresponding to each phase line is generated based on the comparison results. Based on the switch status command data, control the opening and closing of the receiving port of the corresponding phase line.
2. The power line carrier signal transmission method based on a multiple-input multiple-output system as described in claim 1, characterized in that, The three-phase signal transmitted by the parsing end is used to obtain the data stream mode identifier, including: Extract the frame control field from the frame header of the three-phase signal; The frame control field is decoded to obtain a data stream mode identifier that indicates single-stream mode or multi-stream mode.
3. The power line carrier signal transmission method based on a multiple-input multiple-output system as described in claim 1, characterized in that, The calculation of the signal-to-noise ratio data for each phase signal includes: Perform timing synchronization and carrier synchronization on each phase signal to obtain synchronized phase signals; Extract pilot symbols from each phase signal after synchronization, and calculate the signal power and noise power of each phase line based on the pilot symbols; The signal-to-noise ratio (SNR) of each phase signal is calculated based on the signal power and noise power of each phase line.
4. The power line carrier signal transmission method based on a multiple-input multiple-output system as described in claim 3, characterized in that, The calculation of signal power and noise power for each phase based on the pilot symbols includes: Energy integration is performed on the pilot symbols to obtain the signal power of each phase; The signal amplitude is sampled on the idle subcarriers between pilot symbols, and the noise power of each phase is calculated based on the signal amplitude.
5. The power line carrier signal transmission method based on a multiple-input multiple-output system as described in claim 1, characterized in that, The step of comparing each of the signal-to-noise ratio data with a preset threshold and generating switch status command data for the receiving port corresponding to each phase line based on the comparison results includes: Determine whether the signal-to-noise ratio of each phase signal is greater than or equal to a preset threshold. If it is greater than or equal to the threshold, the result is true; otherwise, it is false, and the compliance status of each phase line is obtained. If only one phase line meets the standard, then a switch status command data is generated indicating that the receiving port of that phase line is open and the receiving ports of the other phase lines are closed. If multiple phase lines meet the standard and are true, then select the phase line with the highest signal-to-noise ratio and generate switch status command data that enables the receiving port of that phase line and disables the receiving ports of the other phase lines. If the compliance status of all phase lines is false, calculate the combined signal-to-noise ratio (SNR) of any two-phase combination and determine whether there is a phase line combination with a combined SNR greater than or equal to a preset threshold. If so, generate switch status command data indicating that the receiving ports of two phase lines in the combination are open and the receiving port of the remaining phase line is closed. If the combined SNR of all two-phase combinations is less than the preset threshold, generate switch status command data indicating that the receiving ports of all phase lines are open.
6. The power line carrier signal transmission method based on a multiple-input multiple-output system as described in claim 5, characterized in that, The preset threshold is dynamically adjusted based on the historical noise level of the power line channel.
7. The power line carrier signal transmission method based on a multiple-input multiple-output system as described in claim 1, characterized in that, The step of controlling the opening and closing of the receiving port of the corresponding phase line according to the switch state command data includes: When the switch status command data indicates that the receiving port of a certain phase line is turned on, the power supply of the low noise amplifier and mixer of the radio frequency front end of that phase line is started, so that it enters the working state. When the switch status command data indicates that a certain phase line receiving port is closed, the power supply to the low-noise amplifier and mixer of the RF front end of that phase line is cut off, causing it to enter the off state.
8. The power line carrier signal transmission method based on a multiple-input multiple-output system as described in claim 1, characterized in that, If the communication mode corresponding to the data stream mode identifier is multi-stream mode, then keep the receiving ports of all phase lines open.
9. A power line carrier signal transmission method based on a multiple-input multiple-output system as described in any one of claims 1-8, characterized in that, The three-phase signal is three independent signals transmitted through the A-phase, B-phase, and C-phase power lines respectively.
10. A power line carrier signal transmission device based on a multiple-input multiple-output system, characterized in that, Includes: the sender and the receiver; The transmitting end is used to transmit three-phase signals to the receiving end; The receiving end is used to execute a power line carrier signal transmission method based on a multiple-input multiple-output system as described in any one of claims 1-9.