High-speed data transmission method of power line carrier and OFDM wireless fusion

Abstract

The application discloses a high-speed data transmission method of power line carrier and OFDM wireless fusion, and belongs to the technical field of communication, which comprises the following steps: S10, detecting the transmission quality of data of the power line carrier channel and the OFDM wireless channel, wherein the transmission quality comprises the signal-to-noise ratio and the bit error rate of the power line carrier channel and the OFDM wireless channel; S20, acquiring the electrical parameters of the cable according to the transmission quality, wherein the electrical parameters comprise resistance, inductance and capacitance, and the correlation influence of the change of the resistance on the transmission quality is analyzed based on the resistance; S30, selecting the transmission path according to the correlation influence, and the selection mode comprises respectively presetting safety thresholds of the signal-to-noise ratio and the bit error rate of the power line carrier channel and the OFDM wireless channel based on the change of the resistance. The application improves the stability and reliability of the system through the flexible data distribution strategy, the optimized transmission path selection and the coordinated transmission mechanism, and further provides smoother data transmission service.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a high-speed data transmission method that integrates power line carrier and OFDM wireless communication. Background Technology

[0002] With the rapid development of the Internet of Things (IoT) and smart homes, the demand for high-speed data transmission in home and industrial environments is increasing. Power line carrier communication (PLC) utilizes existing power line networks for data transmission, offering advantages such as no need for additional wiring and wide coverage; however, its transmission rate is limited by power line noise and interference. Orthogonal frequency division multiplexing (OFDM) wireless communication technology, on the other hand, boasts advantages such as high spectral efficiency and strong resistance to multipath interference, but requires additional wireless equipment and spectrum resources.

[0003] Regarding this research, application CN202410287185.2 provides a transmitter and system for power line carrier and wireless integrated transmission. This technical solution includes a transmission signal processing module, a carrier transmission analog front-end, a wireless transmission analog front-end, and a first switching module. The transmission signal processing module processes the data to be transmitted to obtain a digital intermediate frequency (IF) signal. The first switching module selects either the carrier transmission analog front-end or the wireless transmission analog front-end to transmit the digital IF signal according to a preset frequency band selection strategy. This technical solution allows for flexible selection between power line carrier and wireless channels, fully utilizing the advantages of both communication technologies. It can improve the reliability of data transmission in long-distance communication scenarios and solve the problem of blind spots in power distribution communication coverage in Class D and E power supply areas.

[0004] Another application, CN202010192111.2, provides a communication method integrating power line carrier and wireless dual-mode. This technical solution employs a four-layer communication protocol, including: S1, after a communication service is generated, the physical layer performs diversity processing on the input signals of the power line carrier communication channel and the wireless communication channel based on OFDM modulation technology and outputs the results; S2, after receiving a data transmission task, the MAC layer selects either the power line carrier communication channel or the wireless communication channel for data transmission; S3, the network layer selects the optimal routing table path that includes both the power line carrier communication channel and the wireless communication channel; and S4, the application layer aggregates the data from both the power line carrier communication channel and the wireless communication channel. This technical solution achieves heterogeneous converged network communication of power line and wireless, optimizes network performance, improves data acquisition success rate, and reduces the construction and usage costs of smart grids.

[0005] However, the above-mentioned technical solutions suffer from limitations in transmission efficiency and insufficient wireless channel stability in practical applications. For example, although OFDM technology can improve the transmission rate of power line carriers, in complex power network environments, attenuation occurs due to cable resistance, inductance, and capacitance effects, leading to a decrease in the actual data rate. If the data transmission strategy is not adjusted in a timely manner due to these effects, the actual transmission rate will drop significantly, thus affecting the user experience. Summary of the Invention

[0006] In view of the problems existing in the field of existing communication technology, the present invention is proposed.

[0007] Therefore, one of the objectives of this invention is to provide a high-speed data transmission method that integrates power line carrier and OFDM wireless technology. Through flexible data allocation strategies, it can meet the diverse data transmission needs of different users. By optimizing transmission path selection and coordinating transmission mechanisms, it improves the stability and reliability of the system, thereby providing a smoother data transmission service.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0009] This invention provides a high-speed data transmission method integrating power line carrier and OFDM wireless communication, comprising the following steps:

[0010] Step S10: Detect the transmission quality of data in the power line carrier channel and the OFDM wireless channel, wherein the transmission quality includes the signal-to-noise ratio and bit error rate of the power line carrier channel and the OFDM wireless channel;

[0011] Step S20: Obtain the electrical parameters of the cable based on the transmission quality. The electrical parameters include resistance, inductance, and capacitance. Analyze the correlation between changes in resistance and the transmission quality based on the resistance.

[0012] Step S30: Select a transmission path based on the correlation effect. The selection method includes setting a safety threshold for the signal-to-noise ratio (SNR) and bit error rate (BER) of the power line carrier channel and the OFDM wireless channel based on the resistance change. When the SNR of the power line carrier channel and the OFDM wireless channel exceeds the safety threshold corresponding to the SNR, and the BER of the power line carrier channel and the OFDM wireless channel does not exceed the safety threshold corresponding to the BER, the OFDM wireless channel is preferentially selected as the transmission path.

[0013] When the signal-to-noise ratio of the power line carrier channel and the OFDM wireless channel does not exceed the safety threshold corresponding to the signal-to-noise ratio, and the bit error rate of the power line carrier channel and the OFDM wireless channel exceeds the safety threshold corresponding to the bit error rate, the power line carrier channel shall be preferentially selected as the transmission path.

[0014] When the signal-to-noise ratio and bit error rate of the power line carrier channel and the OFDM wireless channel do not exceed the corresponding security threshold, the transmission ratio of data on the power line carrier channel and the OFDM wireless channel is dynamically allocated.

[0015] Step S40: Based on the changes in resistance, count 6 to 10 resistance values ​​whose signal-to-noise ratio and bit error rate exceed the corresponding security threshold, generate a database, and mark the 6 to 10 resistance values ​​as reference resistance values.

[0016] Step S50: Evaluate the transmission quality of data in the power line carrier channel and OFDM wireless channel based on the reference resistance value, and adjust the data transmission strategy according to the evaluation results, including coordinating the transmission of data when the resistance value of the cable changes toward the reference resistance value in the future period; the coordinated transmission includes dividing the data into equal segments and transmitting the equally segmented data through the power line carrier channel and OFDM wireless channel.

[0017] The signal-to-noise ratio (SNR) and bit error rate (BER) of the data transmitted in the power line carrier channel and OFDM wireless channel are collected based on the resistance changes. The resistance value when the SNR and BER are stable is obtained. Based on the resistance value, the amount of data currently being transmitted is equally divided into the data transmitted in the first time period, the data transmitted in the second time period, and the data transmitted in the third time period. The resistance changes are collected based on the transmission time of the data transmitted in each time period. If the transmission time of the data transmitted in adjacent time periods shows an increasing trend, it is determined that there is a trend of decreasing SNR and increasing BER, and the data is coordinated for transmission.

[0018] The resistance is acquired when the transmission time shows an increasing trend, with each natural day as the acquisition period. The average resistance is calculated based on the resistance of at least 10 natural days. If the resistance changes towards the average resistance in future periods, it is determined that there is a trend of decreasing signal-to-noise ratio and increasing bit error rate, and the data is then coordinated for transmission.

[0019] In a preferred embodiment of the present invention, in step S20, the correlation between the change in resistance and the transmission quality is analyzed based on the resistance. The transmission quality of the power line carrier channel is analyzed by establishing an attenuation model for the power line carrier signal, which includes an exponential attenuation model, as shown below:

[0020] ;

[0021] in, Indicates the transmission distance as The signal amplitude at that time, Indicates the initial signal amplitude. This represents the attenuation coefficient.

[0022] In a preferred embodiment of the present invention, the analysis of the transmission quality of the OFDM wireless channel includes dividing the OFDM wireless channel into 10 to 20 subcarriers, presetting a signal frequency for each subcarrier, analyzing the effect of resistance changes on different signal frequencies, and evaluating the impact of resistance changes on transmission quality based on the effects.

[0023] In a preferred embodiment of the present invention, in step S30, the dynamic allocation of the transmission ratio of data on the power line carrier channel and the OFDM wireless channel includes allocating data according to the data priority allocation method, dividing the data into high-priority data and low-priority data, allocating the high-priority data to the channel with low bit error rate and high signal-to-noise ratio, and allocating the low-priority data to the channel with low signal-to-noise ratio and high bit error rate.

[0024] In a preferred embodiment of the present invention, the dynamic allocation of data transmission ratio on the power line carrier channel and the OFDM wireless channel further includes allocation based on a load balancing method. If the load on the power line carrier channel is high, some data is allocated to the OFDM wireless channel; if the load on the OFDM wireless channel is high, some data is allocated to the power line carrier channel. The formula for allocation based on load balancing is as follows:

[0025] ;

[0026] ;

[0027] in, and These represent the proportions of data allocated to the power line carrier channel and the OFDM wireless channel, respectively. and These represent the current load ratios of the power line carrier channel and the OFDM wireless channel, respectively.

[0028] Beneficial effects:

[0029] 1. By detecting the signal-to-noise ratio and bit error rate, and dynamically selecting the transmission path according to the preset security threshold, data is ensured to be transmitted on the optimal channel, thereby improving the reliability and quality of data transmission;

[0030] 2. When the signal-to-noise ratio and bit error rate of both channels do not exceed the safety threshold, the transmission ratio is dynamically allocated to further optimize data transmission. This mechanism can make full use of the advantages of the two channels, avoid overload or underperformance of a single channel, and improve the overall transmission performance of the system.

[0031] 3. By statistically analyzing the impact of resistance values ​​on signal-to-noise ratio and bit error rate, and generating a reference resistance value database, it is possible to predict the changing trend of channel quality in advance. When the resistance value changes towards the reference resistance value, the transmission strategy can be adjusted in advance, such as by coordinating transmission, thereby effectively preventing the deterioration of signal-to-noise ratio and bit error rate, and further improving the reliability of transmission.

[0032] 4. It can also dynamically allocate data according to the current load of the channel to avoid overloading of a certain channel, thereby achieving load balancing. This allocation method can make full use of the transmission capacity of two channels, improve the overall transmission efficiency of the system, and avoid transmission delay or packet loss caused by overloading of a single channel. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the process structure of an embodiment of the present invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0035] Because existing technologies cannot adjust data transmission strategies in a timely manner in complex power grid environments, the actual transmission rate drops significantly, thus affecting the user experience.

[0036] Based on this, the present invention proposes a high-speed data transmission method that integrates power line carrier and OFDM wireless. Through flexible data allocation strategies, it can meet the diverse data transmission needs of different users. By optimizing the transmission path selection and coordinating the transmission mechanism, it improves the stability and reliability of the system, thereby providing a smoother data transmission service.

[0037] The present solution will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0038] Reference Figure 1 This is one embodiment of the present invention, which provides a high-speed data transmission method integrating power line carrier and OFDM wireless communication, comprising the following steps:

[0039] Step S10: Detect the transmission quality of data in the power line carrier channel and the OFDM wireless channel. The transmission quality includes the signal-to-noise ratio and bit error rate of the power line carrier channel and the OFDM wireless channel.

[0040] Step S20: Obtain the electrical parameters of the cable based on the transmission quality. The electrical parameters include resistance, inductance and capacitance. Analyze the correlation between resistance changes and transmission quality based on the resistance.

[0041] Step S30: Select a transmission path based on the correlation effect. The selection method includes setting a safety threshold for the signal-to-noise ratio (SNR) and bit error rate (BER) of the power line carrier channel and the OFDM wireless channel based on the resistance change. When the SNR of the power line carrier channel and the OFDM wireless channel exceeds the safety threshold corresponding to the SNR, and the BER of the power line carrier channel and the OFDM wireless channel does not exceed the safety threshold corresponding to the BER, the OFDM wireless channel is preferentially selected as the transmission path.

[0042] When the signal-to-noise ratio of the power line carrier channel and the OFDM wireless channel does not exceed the safety threshold corresponding to the signal-to-noise ratio, and the bit error rate of the power line carrier channel and the OFDM wireless channel exceeds the safety threshold corresponding to the bit error rate, the power line carrier channel shall be preferentially selected as the transmission path.

[0043] When the signal-to-noise ratio and bit error rate of the power line carrier channel and the OFDM wireless channel do not exceed the corresponding security threshold, the transmission ratio of data on the power line carrier channel and the OFDM wireless channel is dynamically allocated.

[0044] In this embodiment, in reality, in power line carrier channels and OFDM wireless channels, resistance has the greatest impact on transmission quality and is a key factor limiting transmission distance and signal strength. Therefore, this embodiment analyzes the correlation between resistance changes and transmission quality based on resistance, which is of practical significance.

[0045] Step S40: Based on the changes in resistance, count 6 to 10 resistance values ​​whose signal-to-noise ratio and bit error rate exceed the corresponding security threshold, generate a database, and mark the 6 to 10 resistance values ​​as reference resistance values.

[0046] Step S50: Evaluate the transmission quality of data in the power line carrier channel and OFDM wireless channel based on the reference resistance value, and adjust the data transmission strategy according to the evaluation results, including coordinating the transmission of data when the resistance value of the cable changes toward the reference resistance value in the future period; the coordinated transmission includes dividing the data into equal segments and transmitting the equally segmented data through the power line carrier channel and OFDM wireless channel.

[0047] When the resistance value changes toward the reference resistance value, a coordinated transmission method is adopted, in which the data is divided proportionally and transmitted through two channels, which further improves the reliability and stability of the transmission.

[0048] This effectively prevents the impact of signal-to-noise ratio and bit error rate degradation caused by resistance changes on data transmission, and enhances the system's anti-interference capability.

[0049] The signal-to-noise ratio (SNR) and bit error rate (BER) of the data transmitted in the power line carrier channel and OFDM wireless channel are collected based on the resistance changes. The resistance value when the SNR and BER are stable is obtained. Based on the resistance value, the amount of data currently being transmitted is equally divided into the data transmitted in the first time period, the data transmitted in the second time period, and the data transmitted in the third time period. The resistance changes are collected based on the transmission time of the data transmitted in each time period. If the transmission time of the data transmitted in adjacent time periods shows an increasing trend, it is determined that there is a trend of decreasing SNR and increasing BER, and the data is coordinated for transmission.

[0050] By monitoring and analyzing resistance changes in real time, the changing trends of signal-to-noise ratio and bit error rate can be detected in a timely manner, and the transmission strategy can be adjusted accordingly.

[0051] This improves the system's adaptability and flexibility, enabling it to better cope with complex channel environments and dynamically changing transmission requirements;

[0052] The resistance is acquired when the transmission time shows an increasing trend, with each natural day as the collection period. The average resistance is calculated based on the resistance of at least 10 natural days. If the resistance changes towards the average resistance in the future, it is determined that there is a trend of decreasing signal-to-noise ratio and increasing bit error rate, and the data is coordinated for transmission.

[0053] By using natural days as the data collection period and calculating the average resistance based on resistance data from multiple natural days, the accuracy of predicting resistance change trends has been further improved.

[0054] This enables the system to more accurately predict changes in signal-to-noise ratio and bit error rate, and take measures such as coordinated transmission in advance.

[0055] In step S20, the correlation between resistance changes and transmission quality is analyzed based on resistance. Specifically, the transmission quality of the power line carrier channel is analyzed by establishing an attenuation model for the power line carrier signal. This attenuation model includes an exponential attenuation model, as shown below:

[0056] ;

[0057] in, Indicates the transmission distance as The signal amplitude at that time, Indicates the initial signal amplitude. This represents the attenuation coefficient; the analysis of the effect of resistance on the attenuation coefficient is also important. The impact;

[0058] In this embodiment, by establishing an attenuation model for the power line carrier signal, the impact of resistance on transmission quality is analyzed, providing a basis for subsequent transmission path selection and strategy adjustment.

[0059] This allows for a more accurate assessment of the transmission quality of the power line carrier channel, leading to more rational data allocation and transmission path selection.

[0060] Based on the above, the analysis of the transmission quality of OFDM wireless channels includes dividing the OFDM wireless channel into 10 to 20 subcarriers, preset signal frequencies for each subcarrier, and analyzing the impact of resistance changes on different signal frequencies in order to evaluate the impact of resistance changes on transmission quality.

[0061] In this embodiment, the OFDM wireless channel is divided into multiple subcarriers, and the impact of resistance changes on different signal frequencies is analyzed. This allows for a more detailed evaluation of the transmission quality of the OFDM wireless channel, which helps to make more accurate data allocation and transmission strategy adjustments.

[0062] In step S30, the transmission ratio of data on the power line carrier channel and the OFDM wireless channel is dynamically allocated, including allocating data according to the data priority allocation method, dividing the data into high-priority data and low-priority data, allocating high-priority data to the channel with low bit error rate and high signal-to-noise ratio, and allocating low-priority data to the channel with low signal-to-noise ratio and high bit error rate.

[0063] In this embodiment, high-priority data, such as real-time video streams;

[0064] Low-priority data, such as non-real-time file transfers;

[0065] In this embodiment, the concept of data priority is used to allocate data to different channels according to the importance and urgency of the data, ensuring that high-priority data can be transmitted first, which improves the flexibility and adaptability of the system, better meets the data transmission needs of different users, and enhances the user experience.

[0066] Furthermore, the dynamic allocation of data transmission ratio between the power line carrier channel and the OFDM radio channel also includes allocation based on load balancing. If the power line carrier channel has a high load, some data is allocated to the OFDM radio channel; if the OFDM radio channel has a high load, some data is allocated to the power line carrier channel. The formula for allocation based on load balancing is as follows:

[0067] ;

[0068] ;

[0069] in, and These represent the proportions of data allocated to the power line carrier channel and the OFDM radio channel, respectively. and These represent the current load ratios of the power line carrier channel and the OFDM wireless channel, respectively.

[0070] In this embodiment, by combining load balancing allocation, data is dynamically allocated according to the current load of the channel, avoiding the overload problem of a certain channel. This improves the overall transmission efficiency of the system, makes full use of the transmission capacity of the two channels, and avoids resource waste.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A high-speed data transmission method integrating power line carrier and OFDM wireless technology, characterized in that, Includes the following steps: Step S10: Detect the transmission quality of data in the power line carrier channel and the OFDM wireless channel, wherein the transmission quality includes the signal-to-noise ratio and bit error rate of the power line carrier channel and the OFDM wireless channel; Step S20: Obtain the electrical parameters of the cable based on the transmission quality. The electrical parameters include resistance, inductance, and capacitance. Analyze the correlation between changes in resistance and the transmission quality based on the resistance. Step S30: Select a transmission path based on the correlation effect. The selection method includes setting a safety threshold for the signal-to-noise ratio (SNR) and bit error rate (BER) of the power line carrier channel and the OFDM wireless channel based on the resistance change. When the SNR of the power line carrier channel and the OFDM wireless channel exceeds the safety threshold corresponding to the SNR, and the BER of the power line carrier channel and the OFDM wireless channel does not exceed the safety threshold corresponding to the BER, the OFDM wireless channel is preferentially selected as the transmission path. When the signal-to-noise ratio of the power line carrier channel and the OFDM wireless channel does not exceed the safety threshold corresponding to the signal-to-noise ratio, and the bit error rate of the power line carrier channel and the OFDM wireless channel exceeds the safety threshold corresponding to the bit error rate, the power line carrier channel shall be preferentially selected as the transmission path. When the signal-to-noise ratio and bit error rate of the power line carrier channel and the OFDM wireless channel do not exceed the corresponding security threshold, the transmission ratio of data on the power line carrier channel and the OFDM wireless channel is dynamically allocated. Step S40: Based on the changes in resistance, count 6 to 10 resistance values ​​whose signal-to-noise ratio and bit error rate exceed the corresponding security threshold, generate a database, and mark the 6 to 10 resistance values ​​as reference resistance values. Step S50: Evaluate the transmission quality of data in the power line carrier channel and OFDM wireless channel based on the reference resistance value, and adjust the data transmission strategy according to the evaluation results, including coordinating the transmission of data when the resistance value of the cable changes toward the reference resistance value in the future period; the coordinated transmission includes dividing the data into equal segments and transmitting the equally segmented data through the power line carrier channel and OFDM wireless channel. The signal-to-noise ratio (SNR) and bit error rate (BER) of the data transmitted in the power line carrier channel and OFDM wireless channel are collected based on the resistance changes. The resistance value when the SNR and BER are stable is obtained. Based on the resistance value, the amount of data currently being transmitted is equally divided into the data transmitted in the first time period, the data transmitted in the second time period, and the data transmitted in the third time period. The resistance changes are collected based on the transmission time of the data transmitted in each time period. If the transmission time of the data transmitted in adjacent time periods shows an increasing trend, it is determined that there is a trend of decreasing SNR and increasing BER, and the data is coordinated for transmission. The resistance is acquired when the transmission time shows an increasing trend, with each natural day as the acquisition period. The average resistance is calculated based on the resistance of at least 10 natural days. If the resistance changes towards the average resistance in future periods, it is determined that there is a trend of decreasing signal-to-noise ratio and increasing bit error rate, and the data is then coordinated for transmission.

2. The high-speed data transmission method integrating power line carrier and OFDM wireless as described in claim 1, characterized in that, In step S20, the correlation between the resistance change and the transmission quality is analyzed based on the resistance. The transmission quality of the power line carrier channel is analyzed by establishing an attenuation model for the power line carrier signal. This attenuation model includes an exponential attenuation model, as shown below: ； in, Indicates the transmission distance as The signal amplitude at that time, Indicates the initial signal amplitude. This represents the attenuation coefficient.

3. The high-speed data transmission method integrating power line carrier and OFDM wireless as described in claim 2, characterized in that, The analysis of the transmission quality of OFDM wireless channels includes dividing the OFDM wireless channel into 10 to 20 subcarriers, setting a signal frequency for each subcarrier, analyzing the impact of resistance changes on different signal frequencies, and evaluating the impact of resistance changes on transmission quality based on the impact.

4. The high-speed data transmission method integrating power line carrier and OFDM wireless as described in claim 1, characterized in that, In step S30, the dynamic allocation of data transmission ratio on the power line carrier channel and OFDM wireless channel includes allocating data according to the data priority allocation method, dividing the data into high-priority data and low-priority data, allocating the high-priority data to the channel with low bit error rate and high signal-to-noise ratio, and allocating the low-priority data to the channel with low signal-to-noise ratio and high bit error rate.

5. The high-speed data transmission method integrating power line carrier and OFDM wireless as described in claim 4, characterized in that, The dynamic allocation of data transmission ratio on the power line carrier channel and the OFDM wireless channel also includes allocation based on a load balancing method. If the power line carrier channel has a high load, some data is allocated to the OFDM wireless channel; if the OFDM wireless channel has a high load, some data is allocated to the power line carrier channel. The formula for allocation based on load balancing is as follows: ； ； in, and These represent the proportions of data allocated to the power line carrier channel and the OFDM wireless channel, respectively. and These represent the current load ratios of the power line carrier channel and the OFDM wireless channel, respectively.

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