Efficient dual-mode communication method for HPLC (High Performance Liquid Chromatography)

Abstract

The invention relates to an efficient HPLC (High Performance Liquid Chromatography) dual-mode communication method. A system comprises a master node, a slave node and a communication channel. The method comprises the communication steps of system initialization, channel evaluation and selection, data transmission, data verification and retransmission and dynamic channel switching. When the system is initialized, the master and slave nodes self-check and exchange information; in the channel evaluation and selection stage, the master and slave nodes evaluate power line channels and wireless channels according to cycles, and select the channels according to indexes; data transmission is divided into an HPLC mode and a wireless mode, and corresponding coding and modulation technologies are adopted; in data verification and retransmission, a receiving node uses CRC and a Hash value for verification, and retransmission is carried out if errors occur; and monitoring the channel quality during dynamic channel switching, re-evaluating the selected channel after triggering, and ensuring data continuity. The whole communication process ensures high efficiency, stability and safety of information transmission.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to an HPLC dual-mode communication method. Background Art

[0002] With the rapid development of smart grid and Internet of Things, the application of power line communication technology in the field of data transmission is becoming more and more extensive. As an effective way to realize data transmission by power line, HPLC (high-speed power line carrier communication) has shown great potential in many fields such as power information collection and smart home control. However, the single HPLC communication mode faces many challenges in practical applications. For example, the power line channel is susceptible to interference from electrical equipment, resulting in signal attenuation and increased noise, which in turn affects the accuracy and stability of data transmission. In addition, the topology and load characteristics of the power line may limit the transmission distance and bandwidth, and cannot meet the transmission requirements of long distances or large data volumes. To overcome these limitations, combining wireless communication technology with HPLC to form a dual-mode communication mode has become a promising solution. However, the existing HPLC dual-mode communication method still has shortcomings in communication efficiency, reliability and adaptability, and needs further improvement and innovation. Summary of the invention

[0003] The present invention aims to provide an efficient, reliable and adaptable HPLC dual-mode communication method to solve the problems existing in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions: The HPLC dual-mode communication system of the present invention is composed of a master node, a slave node and a communication channel. Both the master node and the slave node are equipped with an HPLC communication module and a wireless communication module, and can automatically switch the communication mode according to the channel conditions. The communication channel includes a power line channel and a wireless channel, and the electromagnetic compatibility and signal isolation are fully considered in the hardware design to reduce mutual interference.

[0005] The present invention is mainly solved by the following technical solutions: The present invention provides an efficient, safe and reliable communication method, and the communication steps include system initialization, channel evaluation and selection, data transmission, data verification and retransmission and dynamic channel switching. When the system is initialized, the master and slave nodes self-check and exchange information. In the channel evaluation and selection stage, the master and slave nodes periodically evaluate the power line channel and the wireless channel and select the channel according to the indicators. Data transmission is divided into HPLC and wireless modes, and corresponding coding and modulation technologies are used. In the verification and retransmission of data, the CRC value and hash value of the received data are first calculated, and then compared with the corresponding values ​​sent by the sending node. If the comparison is inconsistent, retransmission is performed. Monitor the channel quality during dynamic channel switching, re-evaluate the selected channel after triggering, and ensure data continuity.

[0006] Preferably, in step S1, after each node performs hardware self-check, the master node sends an initialization signal to the slave node after the self-check is completed. The signal adopts a specific coding format and includes a unique identifier (ID) of the master node, a clear identification of the supported communication mode (HPLC and wireless mode) and system configuration information.

[0007] Preferably, in the evaluation and selection of the channel in step S2, the master and slave nodes simultaneously start the evaluation mechanism for the power line channel and the wireless channel and set the evaluation cycle. For the power line channel, multiple parameters such as signal strength and noise are measured by installing sensors and built-in circuits, and then the quality indicators such as channel capacity and bit error rate are calculated; for the wireless channel, the signal strength, interference and other parameters are obtained with the help of the receiving module, and the indicators such as SNIR and bandwidth utilization are calculated, and then the communication mode is selected according to the quality indicators of the power line channel and the wireless channel and the preset rules. If the power line channel meets the conditions, the HPLC mode is selected first, otherwise the wireless mode is selected to ensure the communication quality, realize the intelligent selection of the optimal communication channel according to the real-time channel status, improve the efficiency and reliability of communication, adapt to different application scenarios and environmental conditions, and ensure that the data can be transmitted stably and accurately.

[0008] Preferably, the data transmission in step S3 is divided into HPLC and wireless modes. In the HPLC mode, the sending node transmits through the power line channel using LDPC coding and OFDM modulation, and the receiving node demodulates and decodes to recover the data. The wireless mode adopts appropriate coding and modulation methods, and transmits and receives through the antenna, and the receiving node processes accordingly. Different modes of transmission are performed according to the channel selection results to ensure the effectiveness and stability of communication, adapt to various scenarios, improve the efficiency and quality of data transmission, play an important role in the interconnection of smart devices, and meet the communication needs of different applications.

[0009] Preferably, in the step S4 data verification and retransmission, the receiving node adopts a combination of CRC and hash value verification. First, the CRC hash value of the received data is calculated and compared with the corresponding value of the sending node. If the verification results are consistent, the receiving node sends a confirmation signal (ACK) to the sending node; if the verification results are inconsistent, the receiving node sends a confirmation signal to the sending node. If the confirmation signal is inconsistent, the receiving node sends a retransmission request signal (NACK) to the sending node. The sending node retransmits the data after receiving the NACK. The coding and modulation methods can be adjusted during retransmission until the data is correctly received. This method improves reliability through combined verification, ensures data integrity through intelligent retransmission and coding modulation adjustment, reduces error rate, ensures accurate data transmission in HPLC dual-mode communication, improves system stability and data transmission quality, and adapts to complex communication scenarios.

[0010] Preferably, in the step S5 of dynamic channel switching, the master and slave nodes continuously monitor the channel quality during communication. When it is found that the current channel quality drops below the threshold or serious interference occurs, the switching mechanism is immediately triggered. At this time, the node stops data transmission, saves state information, re-evaluates the power line channel and wireless channel quality indicators, and then selects a new channel based on the results to ensure the continuity and stability of data transmission, effectively respond to channel changes, ensure that communication quality is not affected in different environments, and improve the adaptability and reliability of the entire communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a flow chart of the present invention.

[0012] Figure 2 It is a communication system architecture diagram of the present invention. DETAILED DESCRIPTION In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0014] like Figure 1 As shown, the communication method includes step S1: system initialization completes hardware detection through circuit self-test, and after the self-test is completed, the master node sends an initialization signal to the slave node. The signal adopts a specific coding format, including the unique identifier (ID) of the master node, the communication mode (HPLC and wireless communication) clearly identified as supported, and the system configuration information. In step S2 of the communication method of this patent, in the evaluation and selection of the channel, for the power line channel, the master node and the slave node measure multiple parameters by installing high-precision sensors and built-in advanced signal detection circuits on the power line channel, including signal strength, noise level (expressed as noise power spectrum density, in dBm / Hz), signal distortion (measured by calculating the harmonic distortion, intermodulation distortion and other indicators of the signal), channel load (calculated by measuring the current, voltage and other parameters on the power line, combined with the topology and load characteristics of the power line) and frequency response characteristics (measuring the transmission characteristics of the power line for signals of different frequencies) In the transmission of data in step S3 of the communication method, in the HPLC mode, the slave node uses LDPC coding to encode the power consumption data to enhance the anti-interference ability of the data, and then modulates it to multiple subcarriers through OFDM, and transmits the data to the master node using the power line channel. After receiving the signal, the receiving node of the master node performs demodulation and decoding operations in turn to restore the original power consumption data, and stores it in the local database or uploads it to the superior system. If the power line channel is interfered with, such as the start of large electrical equipment nearby causing the power line noise to increase, or the channel capacity is insufficient (for example, during peak power consumption, the amount of data transmitted on the power line channel is too large), the slave node will automatically switch to the wireless communication mode. The wireless mode uses a suitable coding and modulation method to send the data through the built-in antenna of the slave node, and the wireless receiving module of the master node receives the data and processes it accordingly.

[0015] In the verification and retransmission of data in step S4 of the communication method, a combination of CRC and hash value verification is used to ensure the accuracy and integrity of the data. First, the CRC hash value of the received data is calculated and compared with the corresponding value of the sending node. If the verification results are consistent, the receiving node sends a confirmation signal (ACK) to the sending node; if the verification results are inconsistent, the receiving node sends a confirmation signal to the sending node. If the confirmation signal is inconsistent, the receiving node sends a retransmission request signal (NACK) to the sending node. After receiving the NACK, the sending node retransmits the data. During retransmission, the coding and modulation methods can be adjusted until the data is correctly received. This method improves reliability through combined verification, ensures data integrity through intelligent retransmission and coding modulation adjustment, reduces error rate, ensures accurate data transmission in HPLC dual-mode communication, improves system stability and data transmission quality, and adapts to complex communication scenarios.

[0016] In the communication method, the encoding method of HPLC adopts the advanced error correction coding technology low-density parity check code (LDPC) during data transmission. When performing LDPC encoding, the encoding parameters such as code rate, check matrix, etc. are first determined according to the importance of the data and the transmission requirements. Then, the data is encoded according to the determined encoding parameters, and the original data is converted into encoded data to improve the anti-interference ability of the data. At the same time, the data modulation adopts orthogonal frequency division multiplexing (OFDM) technology to modulate the data onto multiple subcarriers. When performing OFDM modulation, the modulation parameters such as the number of subcarriers, subcarrier spacing, and cyclic prefix length are first determined. According to these parameters, the encoded data is allocated to each subcarrier, and the modulation operation is performed to improve the spectrum utilization.

[0017] In step S2, the channel evaluation and selection cycle setting, the master node and the slave node simultaneously start the channel evaluation mechanism and set the evaluation cycle. The evaluation cycle is determined according to the actual application scenario and the requirements for communication real-time performance. In applications with high real-time requirements, it can be set to once every 1 second; In the retransmission process of step S4 of the communication method, the coding and modulation methods can be adjusted according to the actual situation to improve the retransmission success rate. For example, if it is found that LDPC coding is not effective during retransmission, you can try to change it to other error correction coding methods; if OFDM modulation has problems during retransmission, you can try to adjust the modulation parameters such as the number of subcarriers and subcarrier spacing.

[0018] In the channel quality monitoring in the dynamic channel switching of step S5 of the communication method, the master node and the slave node continuously monitor the channel quality. The monitoring frequency is once every 1 second, and the monitoring content includes the signal strength, noise level, bit error rate of the power line channel and the signal strength, interference strength, SNIR and other parameters of the wireless channel. The monitoring data is collected by high-precision sensors and advanced signal detection circuits, and transmitted to the control unit in real time for analysis and processing. If it is found that the quality of the currently used channel drops below a certain threshold, or a sudden severe interference occurs, the channel switching mechanism is triggered. When the channel needs to be switched, the master node and the slave node immediately stop the current data transmission and save the status information of the current transmission, including the amount of data transmitted, the sequence number of the transmission, the current coding and modulation mode, etc.

Claims

1. An efficient HPLC dual-mode communication method, characterized in that: The steps include system initialization, channel evaluation and selection, data transmission, data verification and retransmission, and dynamic channel switching.

2. An efficient HPLC dual-mode communication method according to claim 1, characterized in that: The step S1 system initialization includes the master node self-checking and sending a signal containing ID, mode and configuration information, the slave node receiving the signal and self-checking, and then configuring its own parameters according to the master node information, and feeding back its own ID, selected mode and frequency band.

3. According to an efficient HPLC dual-mode communication method described in claim 1, it is characterized in that: In the step S2 of channel evaluation and selection, the master and slave nodes simultaneously start the mechanism and set the evaluation cycle. For power line channels, multiple parameters such as signal strength and noise are measured by installing sensors and built-in circuits to calculate quality indicators such as channel capacity and bit error rate; For wireless channels, the receiving module is used to obtain parameters such as signal strength and interference, and calculate indicators such as SNIR and bandwidth utilization; According to these indicators and setting rules, if the power line channel meets the conditions, the HPLC mode is selected first, otherwise the wireless mode is selected to ensure the communication quality.

4. An efficient HPLC dual-mode communication method according to claim 1, characterized in that: The data transmission in step S3 is divided into two modes: HPLC and wireless. In HPLC mode, the sending node uses LDPC coding to improve anti-interference capability, modulates the data to multiple subcarriers using OFDM and transmits them through the power line. The receiving node demodulates and decodes the data in turn to restore the original data. In wireless mode, convolution coding is used followed by OFDM modulation, which is transmitted and received through the antenna. The receiving node performs corresponding processing to ensure accurate data transmission. Different modes are based on the channel selection results, ensuring the effectiveness and stability of communication.

5. According to an efficient HPLC dual-mode communication method described in claim 1, it is characterized in that: Step S4 Data verification and retransmission,After receiving the data, the receiving node uses a combination of CRC and hash value verification to first calculate the CRC value and hash value of the received data, and then compare them with the corresponding values ​​sent by the sending node. If the verification results are consistent, the receiving node sends an acknowledgment signal (ACK) to the sending node; If the verification results are inconsistent, the receiving node sends a retransmission request signal (NACK) to the sending node. The sending node resends the data and can adjust the coding and modulation methods during retransmission until the data is received correctly.

6. An efficient HPLC dual-mode communication method according to claim 1, characterized in that: The step S5 is dynamic channel switching. During the communication process, the master and slave nodes continuously monitor the channel quality. The monitoring frequency is based on the set period. When it is found that the current channel quality drops below the threshold or serious interference occurs, the switching mechanism is triggered. At this time, the master and slave nodes stop data transmission, save status information, re-evaluate the quality indicators of the power line channel and the wireless channel, and then select a new channel based on the results to ensure the continuity and stability of data transmission.

7. An efficient HPLC dual-mode communication method according to claim 3, characterized in that: The parameter bit error rate measurement method in the step S2 channel evaluation and selection is to determine the bit error rate by sending a large amount of test data and accurately counting the ratio of the number of erroneous data to the total number of sent data.

8. An efficient HPLC dual-mode communication method according to claim 3, characterized in that: In the step S2, the signal quality is determined by comparing the actual transmission data rate with the channel capacity in the channel evaluation and selection. The actual transmitted data rate is close to the channel capacity, indicating that the power line signal quality is good and the channel resources can be fully utilized for data transmission; The actual transmission rate is much lower than the channel capacity due to poor signal quality, where the poor signal quality includes severe signal attenuation or excessive noise interference.

9. An efficient HPLC dual-mode communication method according to claim 1, characterized in that: In the step S5 of channel switching and evaluation, after the channel switching is triggered, the system adopts an optimized seamless switching process. First, the master and slave nodes will immediately stop the current data transmission and quickly save the current communication status information, including transmission progress, data cache, etc.; Then, the quality of the power line channel and the wireless channel is re-evaluated, and the optimal channel is selected for switching based on the latest evaluation results. During the switching process, a fast retransmission and synchronization mechanism of cached data on the new channel is adopted to avoid data loss and repeated transmission, and achieve smooth channel switching.

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