Vehicle-mounted data transmission method and system

Abstract

The application provides a vehicle-mounted data transmission method and system, which comprises the following steps: dividing vehicle-mounted data into multiple subcarriers; adjusting the data rate of each subcarrier according to the channel quality; optimizing the total transmission rate based on a loss function to obtain the maximum total transmission rate under the requirement of the channel quality; and obtaining the target data transmission rate of the vehicle-mounted data through an adaptive modulation and coding algorithm. By dividing the vehicle-mounted data into multiple subcarriers for parallel transmission, the overall data transmission rate can be increased, then the total transmission rate is optimized based on the loss function to obtain the maximum total transmission rate under the overall channel quality condition, and finally the modulation order of each subcarrier is adjusted and optimized through the adaptive modulation and coding algorithm and based on the above maximum total transmission rate to obtain the optimal target modulation order, so that higher data transmission rate and lower transmission error rate are achieved, and the use in various complex channel environments is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle communication, in particular to a vehicle data transmission method and system. BACKGROUND

[0002] Vehicle communication technology refers to information exchange between vehicles in motion or between vehicles and base stations by using wireless communication technology. The existing vehicle communication technology has the problem that in the complex channel environment of high-speed vehicle movement and multipath fading, the transmission rate is limited, data loss, bit error rate and other problems are prone to occur, which seriously affects the reliability and stability of vehicle communication.

[0003] Due to the difference in channel quality and interference, different transmission rates will produce different bit error rates. In the prior art, a fixed modulation method and coding method are usually used, which cannot adapt to the data transmission demand under different channel quality, resulting in low data transmission rate or high transmission error rate. SUMMARY

[0004] In view of the defects of the prior art, the purpose of the present application is to provide a vehicle data transmission method and system, which aims to solve the technical problems of low data transmission rate or high transmission error rate in the prior art.

[0005] In order to achieve the above purpose, the present application is realized by the following technical scheme: a vehicle data transmission method, comprising the following steps:

[0006] The vehicle data is modulated by multiple carriers to obtain a plurality of subcarriers;

[0007] According to the channel quality, the modulation order of each subcarrier is adjusted to obtain the data rate of each subcarrier according to the modulation order;

[0008] Based on the data rate of each subcarrier, the total transmission rate of the vehicle data is summarized, and the total transmission rate is optimized based on the loss function to obtain the maximum total transmission rate under the requirement of the channel quality;

[0009] By using the adaptive modulation and coding algorithm, the target modulation order of each subcarrier is obtained based on the maximum total transmission rate, so as to obtain the target data transmission rate of the vehicle data, and data transmission is carried out at the target data transmission rate.

[0010] Compared with the prior art, the application has the beneficial effects that: by dividing the vehicle-mounted data into multiple subcarriers for parallel transmission, the overall data transmission rate can be increased, then the modulation order of each subcarrier is adjusted according to the corresponding channel quality, the data rate of each subcarrier is obtained according to the modulation order, the total transmission rate of the vehicle-mounted data is obtained by summarizing the data rates of each subcarrier, the total transmission rate is optimized based on the loss function to obtain the maximum total transmission rate under the condition of the channel quality, the modulation order of each subcarrier is adjusted and optimized based on the adaptive modulation and coding algorithm and the above maximum total transmission rate to obtain the optimal target modulation order, the transmission rate of each subcarrier is obtained to obtain the target data transmission rate of the vehicle-mounted data, so that higher data transmission rate and lower transmission error rate are achieved, and the use in various complex channel environments is met.

[0011] According to an aspect of the above technical solution, the step of dividing the vehicle-mounted data into multiple subcarriers specifically includes:

[0012] Marking the sub-data in the vehicle-mounted data;

[0013] Modulating the marked vehicle-mounted data into multiple subcarriers to obtain multiple subcarriers, the multiple subcarriers including a plurality of first subcarriers and a plurality of second subcarriers corresponding to the marks.

[0014] According to an aspect of the above technical solution, the step of adjusting the modulation order of each subcarrier according to the channel quality to obtain the data rate of each subcarrier according to the modulation order includes:

[0015] The data rate of each subcarrier is obtained according to the following formula:

[0016] R I =a I *log2(1+SNR I / M I );

[0017] In the formula, R I is the data rate of the i-th subcarrier, SNR I is the signal-to-noise ratio of the i-th subcarrier, M I is the modulation order of the i-th subcarrier, a I is the weight of the i-th subcarrier.

[0018] According to an aspect of the above technical solution, the step of summarizing the data rates of each subcarrier to obtain the total transmission rate of the vehicle-mounted data, and optimizing the total transmission rate based on the loss function to obtain the maximum total transmission rate under the requirement of the channel quality specifically includes:

[0019] The maximum total transmission rate under the required channel quality can be obtained using the following formula;

[0020]

[0021] In the formula, L is the maximum total transmission rate, N is the number of subcarriers, and L i Let β be the weight of the loss function for the i-th subcarrier, and let R be the weight of the loss function for the total transmission rate. N The total transmission rate is denoted as .

[0022] According to one aspect of the above technical solution, the step of obtaining the target modulation order of each subcarrier based on the maximum total transmission rate through an adaptive modulation and coding algorithm, thereby obtaining the target data transmission rate of the vehicle data, specifically includes:

[0023] The maximum modulation order under the channel quality requirements is obtained based on the maximum total transmission rate.

[0024] The target modulation order of each subcarrier is obtained using the following formula:

[0025] M i =argmax(γi*log2(1+SNR) i / M));

[0026] In the formula, M i Let γi be the modulation order of the i-th subcarrier, γi be the weight of the adaptive modulation and coding algorithm of the i-th subcarrier, and M be the maximum modulation order.

[0027] The target data transmission rate of the vehicle data is obtained based on the target modulation order of each subcarrier, and data is transmitted according to the target data transmission rate.

[0028] According to one aspect of the above technical solution, the step of obtaining the target modulation order of each subcarrier based on the maximum total transmission rate through an adaptive modulation and coding algorithm, thereby obtaining the target data transmission rate of the vehicle data, specifically includes:

[0029] The maximum modulation order under the channel quality requirements is obtained based on the maximum total transmission rate.

[0030] The target modulation order of each of the first subcarriers is obtained using the following formula:

[0031] M i =argmax(γi*log2(1+SNR) i / M));

[0032] The target modulation order of each second subcarrier is obtained using the following formula:

[0033] M i =argmax(γi*w i *log2(1+SNR i / M));

[0034] In the formula, M i Let γi be the modulation order of the i-th subcarrier, γi be the weights of the adaptive modulation and coding algorithm for the i-th subcarrier, M be the maximum possible modulation order, and w be the modulation order. i Weighting factors for the label;

[0035] The target data transmission rate of the vehicle data is obtained based on the target modulation order of each of the first subcarrier and the second subcarrier, and data is transmitted according to the target data transmission rate.

[0036] On the other hand, the present invention also provides an in-vehicle data transmission system, comprising:

[0037] The multi-carrier modulation module is used to modulate vehicle data into multiple subcarriers;

[0038] An adjustment module is used to adjust the modulation order of each subcarrier according to the channel quality, so as to obtain the data rate of each subcarrier according to the modulation order;

[0039] The loss function module is used to obtain the total transmission rate of the vehicle data based on the sum of the data rates of each subcarrier, and to optimize the total transmission rate based on the loss function to obtain the maximum total transmission rate under the channel quality requirements.

[0040] An adaptive modulation module is used to obtain the target modulation order of each subcarrier based on the maximum total transmission rate through an adaptive modulation and coding algorithm, thereby obtaining the target data transmission rate of the vehicle data, and transmitting data according to the target data transmission rate.

[0041] According to one aspect of the above technical solution, the multi-carrier modulation module specifically includes:

[0042] The tagging unit is used to tag sub-data in the vehicle data;

[0043] A multi-carrier modulation unit is used to perform multi-carrier modulation on the marked vehicle data to obtain multiple subcarriers, wherein the multiple subcarriers include several first subcarriers and several second subcarriers corresponding to the marking.

[0044] According to one aspect of the above technical solution, the adjustment module is specifically used for:

[0045] The data rate of each subcarrier is obtained according to the following formula:

[0046] R I =a I *log2(1+SNR I / M I );

[0047] In the formula, R I For the data rate of the i-th subcarrier, SNR I Let M be the signal-to-noise ratio of the i-th subcarrier. I Let a be the modulation order of the i-th subcarrier. I Let be the weight of the i-th subcarrier.

[0048] According to one aspect of the above technical solution, the loss function module is specifically used for:

[0049] The maximum total transmission rate under the required channel quality can be obtained using the following formula;

[0050]

[0051] In the formula, L is the maximum total transmission rate, N is the number of subcarriers, and L i Let β be the weight of the loss function for the i-th subcarrier, and let R be the weight of the loss function for the total transmission rate. N The total transmission rate is denoted as .

[0052] According to one aspect of the above technical solution, the adaptive modulation module is specifically used for:

[0053] The maximum modulation order under the channel quality requirements is obtained based on the maximum total transmission rate.

[0054] The target modulation order of each subcarrier is obtained using the following formula:

[0055] M i =argmax(γi*log2(1+SNR) i / M);

[0056] In the formula, Mi is the modulation order of the i-th subcarrier, γi is the weight of the adaptive modulation and coding algorithm of the i-th subcarrier, and M is the maximum possible modulation order;

[0057] The target data transmission rate of the vehicle data is obtained based on the target modulation order of each subcarrier, and data is transmitted according to the target data transmission rate.

[0058] According to one aspect of the above technical solution, the adaptive modulation module is specifically used for:

[0059] The maximum modulation order under the channel quality requirements is obtained based on the maximum total transmission rate.

[0060] The target modulation order of each of the first subcarriers is obtained using the following formula:

[0061] M i =argmax(γi*log2(1+SNR) i / M));

[0062] The target modulation order of each second subcarrier is obtained using the following formula:

[0063] M i =argmax(γi*w i *log2(1+SNR i / M));

[0064] In the formula, M i Let γi be the modulation order of the i-th subcarrier, γi be the weights of the adaptive modulation and coding algorithm for the i-th subcarrier, M be the maximum possible modulation order, and w be the modulation order. i Weighting factors for the label;

[0065] The target data transmission rate of the vehicle data is obtained based on the target modulation order of each of the first subcarrier and the second subcarrier, and data is transmitted according to the target data transmission rate. Attached Figure Description

[0066] Fig. 1 This is a flowchart of the vehicle data transmission method in the first embodiment of the present invention;

[0067] Fig. 2 This is a structural block diagram of the vehicle data transmission system in the third embodiment of the present invention;

[0068] Explanation of key component symbols:

[0069] Multi-carrier modulation module 100, adjustment module 200, loss function module 300, and adaptive modulation module 400.

[0070] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0071] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0072] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0074] Please see Figs. 1-2 The image shows a vehicle-mounted data transmission method according to a first embodiment of the present invention, comprising the following steps:

[0075] Step S100 involves multi-carrier modulation of the vehicle data to obtain multiple subcarriers. In this step, the vehicle data can be acquired through GPS and various sensors, and includes vehicle location information and speed information, etc.

[0076] Step S200: Adjust the modulation order of each subcarrier according to the channel quality to obtain the data rate of each subcarrier based on the modulation order. As is easily understood, traditional OFDM systems often use a fixed allocation scheme when allocating subcarriers, which cannot be dynamically adjusted according to the actual channel quality. This leads to wasted or congested subcarriers, affecting the system's transmission efficiency and reliability. The purpose of adjusting the modulation order in this step is to adapt to different transmission environments based on changes in channel quality, thereby maximizing the data transmission rate and ensuring transmission reliability. In a better channel environment, a higher modulation order can be used to increase the data transmission rate, while in a poorer channel environment, a lower modulation order can be used to ensure transmission reliability. By dynamically adjusting the modulation order, current transmission resources can be utilized to the maximum extent, improving the efficiency and performance of wireless transmission.

[0077] Specifically, in this embodiment, step S200 specifically includes: obtaining the data rate of each subcarrier according to the following formula:

[0078] R I =a I *log2(1+SNR I / M I );

[0079] In the formula, R I For the data rate of the i-th subcarrier, SNR I Let M be the signal-to-noise ratio of the i-th subcarrier. I Let a be the modulation order of the i-th subcarrier. I The weight of the i-th subcarrier. The modulation order of the i-th subcarrier is the modulation order adjusted based on channel quality.

[0080] Step S300: The total transmission rate of the vehicle data is obtained by summing the data rates of each subcarrier, and the total transmission rate is optimized based on the loss function to obtain the maximum total transmission rate under the channel quality requirements.

[0081] Specifically, in this embodiment, step S300 includes the following steps:

[0082] The maximum total transmission rate under the required channel quality can be obtained using the following formula;

[0083]

[0084] In the formula, L is the maximum total transmission rate, N is the number of subcarriers, and L i Let β be the weight of the loss function for the i-th subcarrier, and let R be the weight of the loss function for the total transmission rate. N The total transmission rate is R. In this embodiment, the total transmission rate R is... N That is, the sum of the data rates of each subcarrier obtained through step S200. For ease of understanding, the "channel quality" in the above step S200, "adjusting the modulation order of each subcarrier according to the channel quality", refers to adjusting the subcarrier based on the channel quality corresponding to each subcarrier, that is, the signal-to-noise ratio of each subcarrier. The "channel quality" in this step S300, "obtaining the maximum total transmission rate under the requirements of the channel quality", refers to obtaining the corresponding overall maximum transmission rate based on the overall channel quality, that is, the signal-to-noise ratio of the entire channel.

[0085] Step S400: The target modulation order of each subcarrier is obtained by using an adaptive modulation and coding algorithm based on the maximum total transmission rate, thereby obtaining the target data transmission rate of the vehicle data, and data is transmitted according to the target data transmission rate.

[0086] Specifically, in this embodiment, step S400 includes the following steps:

[0087] Step S410: Obtain the maximum modulation order under the channel quality requirements based on the maximum total transmission rate;

[0088] Step S420: The target modulation order of each subcarrier is obtained using the following formula:

[0089] M i =argmax(γi*log2(1+SNR) i / M);

[0090] In the formula, M i Let γi be the modulation order of the i-th subcarrier, γi be the weight of the adaptive modulation and coding algorithm of the i-th subcarrier, and M be the maximum possible modulation order.

[0091] Step S430: The target data transmission rate of the vehicle data is obtained based on the target modulation order of each subcarrier, and data is transmitted according to the target data transmission rate. The optimal transmission rate under specific channel quality conditions is determined using a loss function, and then adaptive modulation and coding are used to further optimize the transmission rate and data transmission quality. In this way, the modulation order and coding scheme can be dynamically adjusted according to actual conditions to maximize transmission efficiency and reliability.

[0092] In summary, the vehicle-mounted data transmission method in the above embodiments of the present invention first divides the data into multiple subcarriers through multi-carrier modulation and obtains a higher data rate through parallel transmission. Then, it optimizes the overall data transmission rate based on channel quality using a loss function. Adaptive modulation and coding are used to dynamically adjust the modulation order of each subcarrier to obtain the target modulation order, i.e., the optimal modulation order, thereby obtaining the optimal target data transmission rate and improving transmission efficiency and reliability.

[0093] The second embodiment of the present invention provides a vehicle data transmission method. The difference between the vehicle data transmission method in this embodiment and the vehicle data transmission method in the first embodiment is as follows:

[0094] In this embodiment, step S100 includes:

[0095] Step S110: Mark the sub-data in the vehicle data;

[0096] Step S120: Multi-carrier modulation is performed on the marked vehicle data to obtain multiple subcarriers. The multiple subcarriers include several first subcarriers and several second subcarriers corresponding to the marking.

[0097] Understandably, in this embodiment, the second subcarrier mentioned above includes the subcarrier marked above, and step S400 specifically includes:

[0098] Step S440: Obtain the maximum modulation order under the channel quality requirements based on the maximum total transmission rate.

[0099] Step S450: The target modulation order of each of the first subcarriers is obtained using the following formula:

[0100] M i =argmax(γi*log2(1+SNR) i / M)).

[0101] Step S460: The target modulation order of each second subcarrier is obtained using the following formula:

[0102] M i =argmax(γi*w i *log2(1+SNR i / M));

[0103] In the formula, M i Let γi be the modulation order of the i-th subcarrier, γi be the weights of the adaptive modulation and coding algorithm for the i-th subcarrier, M be the maximum possible modulation order, and w be the modulation order. i The weighting factor is labeled.

[0104] Step S470: The target data transmission rate of the vehicle data is obtained based on the target modulation order of each of the first and second subcarriers, and data is transmitted according to the target data transmission rate. Specifically, in this step, the second subcarrier includes the marked subcarrier. By marking some of the more important data in the vehicle data, such as location information, the importance of the second subcarrier data is better reflected by identifying this mark and weighting the adaptive modulation and coding algorithm of the i-th subcarrier during subsequent processing, thus better controlling the reliability and security of its transmission.

[0105] Please refer to Fig. 2 The third embodiment of the present invention provides an in-vehicle data transmission system, comprising:

[0106] The multi-carrier modulation module 100 is used to perform multi-carrier modulation on vehicle data to obtain multiple subcarriers;

[0107] The adjustment module 200 is used to adjust the modulation order of each subcarrier according to the channel quality, so as to obtain the data rate of each subcarrier according to the modulation order;

[0108] The loss function module 300 is used to obtain the total transmission rate of the vehicle data based on the sum of the data rates of each subcarrier, and to optimize the total transmission rate based on the loss function to obtain the maximum total transmission rate under the channel quality requirements.

[0109] The adaptive modulation module 400 is used to obtain the target modulation order of each subcarrier based on the maximum total transmission rate through an adaptive modulation and coding algorithm, thereby obtaining the target data transmission rate of the vehicle data, and transmitting data according to the target data transmission rate.

[0110] Preferably, in this embodiment, the multi-carrier modulation module 100 specifically includes:

[0111] The tagging unit is used to tag sub-data in the vehicle data;

[0112] A multi-carrier modulation unit is used to perform multi-carrier modulation on the marked vehicle data to obtain multiple subcarriers, wherein the multiple subcarriers include several first subcarriers and several second subcarriers corresponding to the marking.

[0113] Preferably, in this embodiment, the adjustment module 200 is specifically used for:

[0114] The data rate of each subcarrier is obtained according to the following formula:

[0115] R I =a I *log2(1+SNR I / M I );

[0116] In the formula, R I For the data rate of the i-th subcarrier, SNR I Let M be the signal-to-noise ratio of the i-th subcarrier. I Let a be the modulation order of the i-th subcarrier. I Let be the weight of the i-th subcarrier.

[0117] Preferably, in this embodiment, the loss function module 300 is specifically used for:

[0118] The maximum total transmission rate under the required channel quality can be obtained using the following formula;

[0119]

[0120] In the formula, L is the maximum total transmission rate, N is the number of subcarriers, and L i Let β be the weight of the loss function for the i-th subcarrier, and let R be the weight of the loss function for the total transmission rate. N The total transmission rate is denoted as .

[0121] Preferably, in this embodiment, the adaptive modulation module 400 is specifically used for:

[0122] The maximum modulation order under the channel quality requirements is obtained based on the maximum total transmission rate.

[0123] The target modulation order of each subcarrier is obtained using the following formula:

[0124] M i =argmax(γi*log2(1+SNR) i / M));

[0125] In the formula, M i Let γi be the modulation order of the i-th subcarrier, γi be the weight of the adaptive modulation and coding algorithm of the i-th subcarrier, and M be the maximum possible modulation order.

[0126] The target data transmission rate of the vehicle data is obtained based on the target modulation order of each subcarrier, and data is transmitted according to the target data transmission rate.

[0127] Furthermore, in this embodiment, the adaptive modulation module 400 is specifically used for:

[0128] The maximum modulation order under the channel quality requirements is obtained based on the maximum total transmission rate.

[0129] The target modulation order of each of the first subcarriers is obtained using the following formula:

[0130] M i =argmax(γi*log2(1+SNR) i / M));

[0131] The target modulation order of each second subcarrier is obtained using the following formula:

[0132] M i =argmax(γi*w i *log2(1+SNR i / M));

[0133] In the formula, M i Let γi be the modulation order of the i-th subcarrier, γi be the weights of the adaptive modulation and coding algorithm for the i-th subcarrier, M be the maximum possible modulation order, and w be the modulation order. i Weighting factors for the label;

[0134] The target data transmission rate of the vehicle data is obtained based on the target modulation order of each of the first subcarrier and the second subcarrier, and data is transmitted according to the target data transmission rate.

[0135] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0136] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A vehicle-mounted data transmission method, characterized in that, Includes the following steps: The vehicle data is multi-carrier modulated to obtain multiple subcarriers; The modulation order of each subcarrier is adjusted according to the channel quality to obtain the data rate of each subcarrier based on the modulation order; The total transmission rate of the vehicle data is obtained by summing the data rates of each subcarrier, and the total transmission rate is optimized based on the loss function to obtain the maximum total transmission rate under the channel quality requirements. The target modulation order of each subcarrier is obtained by means of an adaptive modulation and coding algorithm based on the maximum total transmission rate, thereby obtaining the target data transmission rate of the vehicle data, and data is transmitted according to the target data transmission rate; The step of adjusting the modulation order of each subcarrier according to the channel quality to obtain the data rate of each subcarrier according to the modulation order includes: The data rate of each subcarrier is obtained according to the following formula: ； In the formula, Let i be the data rate of the i-th subcarrier. Let be the signal-to-noise ratio of the i-th subcarrier. Let i be the modulation order of the i-th subcarrier. The weight of the i-th subcarrier; The step of summing the data rates of each subcarrier to obtain the total transmission rate of the vehicle data, and optimizing the total transmission rate based on a loss function to obtain the maximum total transmission rate under the channel quality requirements, specifically includes: The maximum total transmission rate under the required channel quality can be obtained using the following formula; ； In the formula, The maximum total transmission rate is optimized by the loss function. The number of subcarriers, Let be the weights of the loss function for the i-th subcarrier. The weights of the loss function for the total transmission rate, Data rate for multiple subcarriers The total transmission rate is obtained by summing up the data.

2. The vehicle-mounted data transmission method according to claim 1, characterized in that, The step of dividing the vehicle data into multiple subcarriers specifically includes: Label the sub-data in the vehicle data; The marked vehicle data is multi-carrier modulated to obtain multiple subcarriers, including several first subcarriers and several second subcarriers corresponding to the markings.

3. The vehicle-mounted data transmission method according to claim 1, characterized in that, The step of obtaining the target modulation order of each subcarrier based on the maximum total transmission rate using an adaptive modulation and coding algorithm, thereby obtaining the target data transmission rate of the vehicle data, specifically includes: The maximum modulation order under the channel quality requirements is obtained based on the maximum total transmission rate. The target modulation order of each subcarrier is obtained using the following formula: ； In the formula, Let i be the modulation order of the i-th subcarrier. The weights of the adaptive modulation and coding algorithm for the i-th subcarrier are... The maximum modulation order; The target data transmission rate of the vehicle data is obtained based on the target modulation order of each subcarrier, and data is transmitted according to the target data transmission rate.

4. The vehicle-mounted data transmission method according to claim 2, characterized in that, The step of obtaining the target modulation order of each subcarrier based on the maximum total transmission rate using an adaptive modulation and coding algorithm, thereby obtaining the target data transmission rate of the vehicle data, specifically includes: The maximum modulation order under the channel quality requirements is obtained based on the maximum total transmission rate. The target modulation order of each of the first subcarriers is obtained using the following formula: ； The target modulation order of each second subcarrier is obtained using the following formula: ； In the formula, Let i be the modulation order of the i-th subcarrier. The weights of the adaptive modulation and coding algorithm for the i-th subcarrier are... The maximum modulation order, Weighting factors for the label; The target data transmission rate of the vehicle data is obtained based on the target modulation order of each of the first subcarrier and the second subcarrier, and data is transmitted according to the target data transmission rate.

5. A vehicle-mounted data transmission system, characterized in that, include: The multi-carrier modulation module is used to modulate vehicle data into multiple subcarriers; An adjustment module is used to adjust the modulation order of each subcarrier according to the channel quality, so as to obtain the data rate of each subcarrier according to the modulation order; The loss function module is used to obtain the total transmission rate of the vehicle data based on the sum of the data rates of each subcarrier, and to optimize the total transmission rate based on the loss function to obtain the maximum total transmission rate under the channel quality requirements. An adaptive modulation module is used to obtain the target modulation order of each subcarrier based on the maximum total transmission rate through an adaptive modulation and coding algorithm, thereby obtaining the target data transmission rate of the vehicle data, and transmitting data according to the target data transmission rate; The adjustment module is specifically used for: The data rate of each subcarrier is obtained according to the following formula: ； In the formula, Let i be the data rate of the i-th subcarrier. Let be the signal-to-noise ratio of the i-th subcarrier. Let i be the modulation order of the i-th subcarrier. The weight of the i-th subcarrier; The loss function module is specifically used for: The maximum total transmission rate under the required channel quality can be obtained using the following formula; ； In the formula, The maximum total transmission rate is optimized by the loss function. The number of subcarriers, Let be the weights of the loss function for the i-th subcarrier. The weights of the loss function for the total transmission rate, Data rate for multiple subcarriers The total transmission rate is obtained by summing up the data.

6. The vehicle-mounted data transmission system according to claim 5, characterized in that, The multi-carrier modulation module specifically includes: The tagging unit is used to tag sub-data in the vehicle data; A multi-carrier modulation unit is used to perform multi-carrier modulation on the marked vehicle data to obtain multiple subcarriers, wherein the multiple subcarriers include several first subcarriers and several second subcarriers corresponding to the marking.

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