A coal mine wireless transmission method, device, communication system and storage medium

Abstract

The present application belongs to the technical field of wireless communication, and discloses a coal mine wireless transmission method, device, communication system and storage medium. The present application firstly constructs a coal mine wireless transmission model, including a data sending end, a legal data receiving end and an illegal data stealing end; the sending end data includes public data packets, privacy data packets and key data packets; the privacy data packets and the key data packets are superimposed in the power domain through NOMA, and the data stream after NOMA multiplexing is transmitted with the public data packets by using TDMA; then, based on the coal mine wireless transmission model, a coal mine wireless communication end-to-end error probability minimization problem is constructed, taking the code length allocated to the public data packet transmission and the code length shared by the privacy data packet and the key data packet as optimization variables; finally, a code length allocation optimization scheme is obtained. The present application can improve the joint privacy-reliability performance of coal mine wireless communication.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wireless communication, and more particularly relates to a coal mine wireless transmission method, device, communication system and storage medium. BACKGROUND

[0002] Wireless transmission in coal mines that takes into account privacy and reliability plays an important role in production and operation and safety management of coal mines, such as communication and exchange of sensitive information such as internal work arrangement, equipment fault maintenance plan, safety inspection record, etc. However, the current coal mine wireless communication does not fully consider privacy, and the analysis of privacy and reliability is still missing in existing research. How to realize the improvement of privacy-reliability performance in the transmission process has great research significance in the existing coal mine scene.

[0003] In addition, thanks to the research of Polyanskiy et al. on the finite code length theorem, the decoding error probability in the wireless communication transmission process can be better modeled. However, Polyanskiy et al. only analyzed the decoding error probability of point-to-point wireless communication transmission process, and the end-to-end reliability research is still lacking. SUMMARY

[0004] The present application provides a coal mine wireless transmission method, device, communication system and storage medium, which solves the problem that the existing coal mine wireless transmission cannot take into account privacy and reliability.

[0005] In a first aspect, the present application provides a coal mine wireless transmission method, comprising the following steps:

[0006] S1, constructing a coal mine wireless transmission model;

[0007] The coal mine wireless transmission model includes one data sending end, one legal data receiving end and one illegal data stealing end; the sending end data includes public data packets, privacy data packets and key data packets; the privacy data packets and the key data packets are superimposed in the power domain by NOMA, and the data stream after NOMA multiplexing is transmitted with the public data packets by TDMA;

[0008] S2, based on the coal mine wireless transmission model, constructing a coal mine wireless communication end-to-end error probability minimization problem with the first code length and the second code length as optimization variables;

[0009] The first code length is the code length allocated for the transmission of the public data packets, and the second code length is the code length shared by the privacy data packets and the key data packets;

[0010] S3, solving the error probability minimization problem to obtain an allocation optimization scheme of the first code length and the second code length; and configuring the coal mine wireless communication based on the allocation optimization scheme.

[0011] Preferably, the error probability minimization problem of the coal mine wireless communication end-to-end is represented as follows:

[0012]

[0013]

[0014] In the formula, represents the error probability of the coal mine wireless communication end-to-end, represents the first code length, represents the second code length, represents the set data transmission delay constraint, represents the symbol duration.

[0015] Preferably, the error probability of the coal mine wireless communication end-to-end is represented as follows:

[0016]

[0017] In the formula, represents the decoding error probability of the legal data receiving end when receiving all data, represents the decoding error probability of the illegal data stealing end when receiving all data; wherein the all data includes the public data packet, the privacy data packet and the key data packet.

[0018] Preferably, the decoding error probability of the legal data receiving end when receiving all data is represented as follows:

[0019]

[0020] In the formula, represents the decoding error probability of the legal data receiving end when receiving the public data packet, represents the decoding error probability of the legal data receiving end when receiving the privacy data packet, represents the decoding error probability of the legal data receiving end when receiving the key data packet;

[0021] The decoding error probability of the illegal data stealing end when receiving all data is represented as follows:

[0022]

[0023] In the formula, This represents the probability of a decoding error when an unauthorized data-stealing device receives public data packets. This indicates the probability of a decoding error when an unauthorized data-stealing device receives a privacy data packet. This indicates the probability of a decoding error when an illegal data-stealing device receives a key data packet.

[0024] Preferably, the constructed end-to-end error probability minimization problem for coal mine wireless communication also includes the following constraints: , and All are less than the set decoding error probability threshold.

[0025] Preferably, the decoding error probability of a data receiving end when receiving a data packet is determined by its corresponding code length, channel dispersion, Shannon capacity, and code rate; the data receiving end is either the legitimate data receiving end or the illegitimate data intercepting end, and the data packet is the public data packet, the privacy data packet, or the key data packet.

[0026] Preferably, when solving the problem of minimizing the error probability, the following is used: As the objective, minimizing the error probability is equivalent to solving a problem containing only... This optimization problem with one optimization variable is solved to obtain... Then according to the constraints Calculated The solution.

[0027] In a second aspect, the present invention provides a wireless transmission device for coal mines, comprising:

[0028] The model building unit is used to construct a wireless transmission model for a coal mine. The wireless transmission model for a coal mine includes a data transmitter, a legitimate data receiver, and an illegitimate data interceptor. The data at the transmitter includes public data packets, privacy data packets, and key data packets. The privacy data packets and the key data packets are superimposed in the power domain using NOMA. The data stream multiplexed by NOMA and the public data packets are transmitted using TDMA.

[0029] The minimization problem construction unit is used to construct an end-to-end error probability minimization problem for coal mine wireless communication based on the coal mine wireless transmission model, with a first code length and a second code length as optimization variables; the first code length is the code length allocated for the transmission of the public data packet, and the second code length is the code length shared by the privacy data packet and the key data packet;

[0030] The calculation unit is used to solve the error probability minimization problem and obtain an optimized allocation scheme for the first code length and the second code length.

[0031] The coal mine wireless transmission device is used for executing the steps in the coal mine wireless transmission method.

[0032] In a third aspect, the present application provides a communication system, which comprises a data sending end, a legal data receiving end and an illegal data stealing end; the data sending end is used for transmitting a first code length transmission public data packet obtained by the coal mine wireless transmission method, a second code length transmission private data packet obtained by the coal mine wireless transmission method and a key data packet; the private data packet and the key data packet are superimposed in a power domain by NOMA, and the data stream after NOMA multiplexing is transmitted with the public data packet by TDMA.

[0033] In a fourth aspect, the present application provides a storage medium for storing a computer program or instructions, which, when running on a computer, enables the computer to execute the coal mine wireless transmission method.

[0034] The one or more technical solutions provided in the present application have at least the following technical effects or advantages:

[0035] The application firstly constructs a coal mine wireless transmission model, the coal mine wireless transmission model comprising a data sending end, a legal data receiving end and an illegal data stealing end; the sending end data comprises a public data packet, a privacy data packet and a key data packet; the privacy data packet and the key data packet are superimposed in a power domain through NOMA (Non-Orthogonal Multiple Access), and the data stream after NOMA multiplexing is transmitted with the public data packet through TDMA (Time Division Multiple Access); then, based on the coal mine wireless transmission model, a coal mine wireless communication end-to-end error probability minimization problem is constructed with a first code length (a code length allocated for public data packet transmission) and a second code length (a code length shared by the privacy data packet and the key data packet) as optimization variables; finally, the error probability minimization problem is solved to obtain an allocation optimization scheme of the first code length and the second code length; and the coal mine wireless communication is configured based on the allocation optimization scheme. That is, the application proposes a coal mine wireless transmission scheme based on a hybrid TDMA-NOMA transmission mechanism for the special scene of coal mine wireless communication, while considering the privacy of wireless transmission, a coal mine wireless communication scene comprising a data sending end, a legal data receiving end and an illegal data stealing end is constructed. The application introduces a key data packet, and divides the original sending data into two parts, one part (i.e. the public data packet) can be directly decoded, and the other part (i.e. the privacy data packet) needs to be decoded with the aid of the introduced key data packet. The application uses the hybrid TDMA-NOMA transmission mechanism to send data, uses the limited code length theory to represent the decoding error probability of a single data transmission process, and accordingly deduces a closed-form expression of the joint privacy-reliability performance of the end-to-end service process, constructs a coal mine wireless communication end-to-end error probability minimization problem with code length as the optimization variable and solves it. The application can improve the joint privacy-reliability performance of the coal mine wireless communication, and can further ensure the safety of the coal mine. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 A flowchart of a coal mine wireless transmission method provided for the embodiment 1 of the application;

[0037] Figure 2 A scene schematic diagram corresponding to the coal mine wireless transmission method provided for the embodiment 1 of the application;

[0038] Figure 3 A performance comparison diagram of the coal mine wireless transmission method provided for the embodiment 1 of the application and a traditional method. DETAILED DESCRIPTION

[0039] For better understanding of the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings and specific embodiments of the specification.

[0040] Embodiment 1:

[0041] Embodiment 1 provides a coal mine wireless transmission method, see Figure 1 , comprising the following steps:

[0042] S1, constructing a coal mine wireless transmission model;

[0043] The coal mine wireless transmission model includes a data sending end, a legal data receiving end and an illegal data stealing end; the sending end data includes public data packets, private data packets and key data packets; the private data packets and the key data packets are superimposed in the power domain through NOMA, and the data stream after NOMA multiplexing is transmitted with the public data packets using TDMA;

[0044] S2, based on the coal mine wireless transmission model, constructing a coal mine wireless communication end-to-end error probability minimization problem with the first code length and the second code length as optimization variables;

[0045] The first code length is the code length allocated for the transmission of the public data packets, and the second code length is the code length shared by the private data packets and the key data packets;

[0046] S3, solving the error probability minimization problem to obtain the allocation optimization scheme of the first code length and the second code length; based on the allocation optimization scheme, the configuration of the coal mine wireless communication is carried out.

[0047] Referring to Figure 1 and Figure 2 , the steps will be described in detail.

[0048] S1, constructing a coal mine wireless transmission model.

[0049] The present application faces the characteristics of coal mine wireless communication transmission, jointly considers the reliability and security of the wireless transmission process, and models the coal mine communication network (i.e. coal mine wireless transmission) containing a data sending end (Alice, for example, the data sending end is a sensor), a legal data receiving end (Bob) and an illegal data stealing end (Eve).

[0050] Specifically, the coal mine wireless transmission scene is located in a radius of The circular area is within the range of 10m to 160m, and the radius R of the coal mine wireless transmission scene is within the range of 10m to 160m.

[0051] The radius R of the coal mine wireless transmission scene is within the range of 10m to 160m.

[0052] On the basis of the above-mentioned model, the data packet of the sending end is divided into a public data packet and a privacy data packet, the size of the public data packet is , and the size of the privacy data packet is In order to improve the privacy of the coal mine data transmission, a key data packet is introduced, and the size of the key data packet is Finally, the data of the sending end in the application includes the public data packet, the privacy data packet and the key data packet.

[0053] On the basis of the above-mentioned data packet segmentation mode, the application proposes a hybrid TDMA-NOMA transmission mechanism, wherein the privacy data packet and the key data packet are superimposed in the power domain through NOMA, and the data stream after NOMA multiplexing is transmitted with the public data packet through TDMA.

[0054] ​The existing conventional transmission scheme is generally TDMA transmission, but only using TDMA will cause the time of each data packet to be reduced, and the error probability to be increased, specifically, only using TDMA can cause the decoding error probability of the legal data receiving end (Bob) to be increased, and the end-to-end privacy performance to be decreased; only using NOMA can increase the serial interference, and also increase the error probability, specifically, when three data packets are superimposed together and transmitted by using NOMA, the additional serial interference can cause the decoding error probability of the legal data receiving end (Bob) to be sharply increased, and then the end-to-end privacy performance is decreased. The present application can further protect the privacy security by increasing the key data packet, the present application is based on the division and decoding mode of the data packet, and according to the characteristics of the public data packet (which has less influence on the data privacy performance), the privacy data packet and the key data packet (which are dependent on each other, but have greater influence on the data privacy performance), a transmission mode combining TDMA and NOMA is used, after the transmission mode combining TDMA and NOMA is used, the decoding error probability of the legal data receiving end (Bob) is reduced, and for the illegal data stealing end (Eve), the number of packets is increased, and the key data packet and the privacy data packet have a direct dependent relationship, based on the above consideration, the transmission mode of each data packet is determined, so that the possibility of the illegal data stealing end (Eve) stealing complete information is lower, and then the end-to-end privacy-reliability performance is enhanced.

[0055] S2, based on the coal mine wireless transmission model, a coal mine wireless communication end-to-end error probability minimization problem with the first code length and the second code length as optimization variables is constructed.

[0056] In order to meet the high reliability of coal mine communication transmission, the decoding error probability of single data transmission is characterized by using the limited code length theory, and the closed-form expression of the joint privacy-reliability performance of the end-to-end service process (i.e. the error probability of the coal mine wireless communication end-to-end) is derived, and the end-to-end joint privacy-reliability performance optimization problem with the code length as the optimization variable is constructed.

[0057] Specifically, the decoding error probability of the public data packet is represented as:

[0058] (1)

[0059] In the formula, indicates the decoding error probability of the legal data receiving end (Bob) when receiving the public data packet, indicates the Q function in statistics; indicates the code length allocated for the transmission of the public data packet, denoted as the first code length; indicates the channel dispersion corresponding to the transmission of the public data packet, denotes the Shannon capacity of the legitimate data receiver (Bob) when receiving the common data packet, denotes the signal-to-noise ratio of the legitimate data receiver (Bob) when receiving the common data packet, denotes the code rate corresponding to the transmission of the common data packet.

[0060] wherein, , , , denotes the size of the common data packet, denotes the channel gain corresponding to the transmission of the common data packet, denotes the power of the common data packet, denotes the path loss corresponding to the transmission of the common data packet, denotes the noise power corresponding to the transmission of the common data packet.

[0061] For example, the path loss can be expressed as When the transmission distance d between the sender and the receiver is determined, the path loss can be directly obtained.

[0062] For the private data packet and the key data packet, the two data packets share the code length transmitted, denoted as the second code length, and the corresponding signal-to-interference-and-noise ratios are respectively denoted as:

[0063] (2)

[0064] (3)

[0065] wherein, denotes the signal-to-interference-and-noise ratio of the legitimate data receiver (Bob) when receiving the private data packet, denotes the signal-to-interference-and-noise ratio of the legitimate data receiver (Bob) when receiving the key data packet, denotes the channel gain corresponding to the transmission of the private data packet, denotes the channel gain corresponding to the transmission of the key data packet, denotes the power of the private data packet, denotes the power of the key data packet, denotes the noise power corresponding to the transmission of the private data packet, denotes the noise power corresponding to the transmission of the key data packet. Therefore, the corresponding decoding error probabilities are respectively denoted as:

[0066] (4)

[0067] (5)

[0068] wherein, denotes the decoding error probability of the legitimate data receiver (Bob) when receiving the privacy data packet, denotes the decoding error probability of the legitimate data receiver (Bob) when receiving the key data packet, denotes the second code length, denotes the channel dispersion corresponding to the shared transmission of the privacy data packet and the key data packet, denotes the Shannon capacity of the legitimate data receiver (Bob) when receiving the privacy data packet, denotes the Shannon capacity of the legitimate data receiver (Bob) when receiving the key data packet, denotes the code rate corresponding to the transmission of the privacy data packet, denotes the code rate corresponding to the transmission of the key data packet.

[0069] wherein, , , , , denotes the size of the privacy data packet, denotes the size of the key data packet.

[0070] Based on this, the decoding error probability of the legitimate data receiver (Bob) when receiving all data (including the public data packet, the privacy data packet and the key data packet) is represented as:

[0071] (6)

[0072] wherein, denotes the decoding error probability of the legitimate data receiver (Bob) when receiving all data.

[0073] It is worth mentioning that in order to ensure the high reliability of the data transmission of the legitimate data receiver (Bob), the decoding error probabilities of the three data packets are all much smaller than 0.01, so the approximation in formula (6) is established. That is, the error probability minimization problem of the coal mine wireless communication end-to-end constructed also includes the following constraint conditions: , and are all smaller than the set decoding error probability threshold, which can be 0.01.

[0074] For the illegal data stealing end (Eve), the decoding error probabilities of the three parts of the public data packet, the privacy data packet and the key data packet are respectively represented as:

[0075] (7)

[0076] (8)

[0077] (9)

[0078] where, denotes the decoding error probability of the eavesdropper (Eve) when receiving the public data packet, denotes the decoding error probability of the eavesdropper (Eve) when receiving the privacy data packet, denotes the decoding error probability of the eavesdropper (Eve) when receiving the key data packet; denotes the Shannon capacity of the eavesdropper (Eve) when receiving the public data packet, denotes the Shannon capacity of the eavesdropper (Eve) when receiving the privacy data packet, denotes the Shannon capacity of the eavesdropper (Eve) when receiving the key data packet, denotes the signal-to-noise ratio of the eavesdropper (Eve) when receiving the public data packet, denotes the signal-to-interference-plus-noise ratio of the eavesdropper (Eve) when receiving the privacy data packet, denotes the signal-to-interference-plus-noise ratio of the eavesdropper (Eve) when receiving the key data packet.

[0079] where, , and The specific expressions of and are similar to those of the legitimate data receiver (Bob), and can be obtained by replacing the corresponding signal-to-noise ratio or signal-to-interference-plus-noise ratio; , and The specific expressions of and are similar to those of formula (2) and (3).

[0080] Based on this, the decoding error probability of the eavesdropper (Eve) when receiving all data (including the public data packet, the privacy data packet, and the key data packet) is represented as:

[0081] (10)

[0082] where, denotes the decoding error probability of the eavesdropper (Eve) when receiving all data.

[0083] In summary, the comprehensive performance of the joint privacy-reliability of the coal mine wireless communication end-to-end (i.e., the error probability of the coal mine wireless communication end-to-end) corresponds to the closed-form expression calculation as follows:

[0084] (11)

[0085] where, denotes the error probability of the coal mine wireless communication end-to-end.

[0086] Based on this, combined with parameters, the following end-to-end joint privacy-reliability performance optimization problem can be constructed, that is, the minimum problem of the end-to-end error probability of the entire system in the coal mine wireless communication scenario:

[0087] (12)

[0088] (12-a)

[0089] (12-b)

[0090] In the formula, denotes the symbol duration, that is, the duration of each symbol.

[0091] For example, is set to 0.025 ms. The maximum transmission time allowed by the entire system can be set to 25 ms.

[0092] S3, solving the error probability minimization problem to obtain the allocation optimization scheme of the first code length and the second code length; based on the allocation optimization scheme, the coal mine wireless communication is configured.

[0093] Based on the constructed end-to-end joint privacy-reliability performance optimization problem, the relationship between the optimization variables when the optimal solution is obtained is analyzed, so as to obtain the code length allocation strategy, thereby improving the joint privacy-reliability of the coal mine wireless transmission.

[0094] Specifically, the efficient solving algorithm is to analyze the convexity of the objective function and each constraint. The first and second order derivatives of the optimization problem, that is, formula (12) with respect to the code length and are respectively:

[0095] (13)

[0096] (14)

[0097] (15)

[0098] (16)

[0099] Therefore, one of the constraint conditions, that is, formula (12-a), is equal when the optimal solution is obtained, so the optimization problem, that is, formula (12), can be equivalent to an optimization problem containing only one optimization variable. Because the objective function is convex with respect to , so the solution of the code length allocation can be solved by the following steps:

[0100] Step 1: reduce the optimization problem to a single-objective optimization problem;

[0101] Step 2: According to the relationship of the push, the solution of is obtained;

[0102] Step 3: According to , the solution of is obtained.

[0103] Figure 3 As a comparison result of the method proposed in the present application and the traditional transmission mechanism (TDMA is used to transmit data, and data is not divided into public data packets and privacy data packets), Figure 3 the abscissa in Figure 3 is the packet size, the ordinate in Figure 3 is the performance of joint privacy-reliability, and the ordinate is specifically the error probability of the end-to-end wireless communication in the coal mine.

[0104] Embodiment 2:

[0105] Embodiment 2 provides a wireless transmission device for coal mine, comprising:

[0106] a model construction unit, configured to construct a wireless transmission model for coal mine, the wireless transmission model for coal mine comprising a data sending end, a legitimate data receiving end and an illegal data stealing end; the sending end data comprises public data packets, privacy data packets and key data packets; the privacy data packets and the key data packets are superimposed in the power domain through NOMA, and the data stream after NOMA multiplexing is transmitted using TDMA with the public data packets;

[0107] a minimum problem construction unit, configured to construct, based on the wireless transmission model for coal mine, an error probability minimization problem of the end-to-end wireless communication in the coal mine, with a first code length and a second code length as optimization variables; the first code length is a code length allocated for transmission of the public data packets, and the second code length is a code length shared by the privacy data packets and the key data packets;

[0108] a calculation unit, configured to solve the error probability minimization problem to obtain an allocation optimization scheme of the first code length and the second code length;

[0109] The wireless transmission device for coal mine is used to execute the steps in the wireless transmission method for coal mine as described in Embodiment 1.

[0110] Since the functions of each unit in the wireless transmission device for coal mine provided in Embodiment 2 correspond to the steps in the wireless transmission method for coal mine provided in Embodiment 1, Embodiment 2 can be understood by referring to Embodiment 1, which will not be repeated here.

[0111] Embodiment 3:

[0112] Embodiment 3 provides a communication system, which comprises one data sending end, one legal data receiving end and one illegal data stealing end; the data sending end is used to transmit the first code length transmission public data packet obtained by the coal mine wireless transmission method as described in Embodiment 1, the second code length transmission private data packet and the key data packet obtained by the coal mine wireless transmission method as described in Embodiment 1; and the private data packet and the key data packet are superimposed in the power domain by NOMA, and the data stream after NOMA multiplexing is transmitted with the public data packet by TDMA.

[0113] Embodiment 3 is proposed on the basis of Embodiment 1, and the code length allocation optimization scheme determined by Embodiment 1 is used for data transmission in a communication system comprising one data sending end, one legal data receiving end and one illegal data stealing end, and this communication system combines TDMA and NOMA for transmission, which can improve the joint privacy-reliability performance of coal mine wireless communication.

[0114] Embodiment 4:

[0115] Embodiment 4 provides a storage medium for storing computer programs or instructions, which, when running on a computer, make the computer execute the coal mine wireless transmission method as described in Embodiment 1.

[0116] Finally, it should be explained that the above specific embodiments are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A wireless transmission method for coal mines, characterized in that, Includes the following steps: S1. Construct a wireless transmission model for coal mines; The wireless transmission model for coal mines includes a data transmitter, a legitimate data receiver, and an illegitimate data interceptor. The data transmitted includes public data packets, privacy data packets, and key data packets. The privacy data packets and the key data packets are superimposed in the power domain using NOMA, and the data stream multiplexed by NOMA is transmitted with the public data packets using TDMA. S2. Based on the coal mine wireless transmission model, construct the end-to-end error probability minimization problem of coal mine wireless communication with the first code length and the second code length as optimization variables. The first code length is the code length allocated for the transmission of the public data packet, and the second code length is the code length shared by the privacy data packet and the key data packet; The problem of minimizing the end-to-end error probability of the constructed coal mine wireless communication is expressed as follows: In the formula, This represents the end-to-end error probability of wireless communication in coal mines. Indicates the length of the first yard. Indicates the length of the second code. This indicates the set latency constraint for data transmission. Indicates the duration of the symbol; The end-to-end error probability of wireless communication in coal mines It is expressed as follows: In the formula, This represents the probability of a decoding error when a legitimate data receiver receives all data. This represents the probability of a decoding error when an illegal data-stealing device receives all data; wherein, all data includes the public data packet, the privacy data packet, and the key data packet; The probability of decoding errors when the legitimate data receiver receives all data. It is expressed as follows: In the formula, This represents the probability of a decoding error when a legitimate data receiver receives a public data packet. This represents the probability of a legitimate data receiver making a decoding error when receiving a privacy data packet. This represents the probability of a legitimate data receiver making a decoding error when receiving a key data packet; The probability of decoding errors when the illegal data-stealing device receives all data. It is expressed as follows: In the formula, This represents the probability of a decoding error when an unauthorized data-stealing device receives public data packets. This indicates the probability of a decoding error when an unauthorized data-stealing device receives a privacy data packet. This represents the probability of a decoding error when an unauthorized data-stealing device receives a key data packet. S3. Solve the error probability minimization problem to obtain an optimized allocation scheme for the first code length and the second code length; Configure wireless communication in coal mines based on the aforementioned allocation optimization scheme.

2. The wireless transmission method for coal mines according to claim 1, characterized in that, The problem of minimizing the end-to-end error probability of the constructed coal mine wireless communication also includes the following constraints: , and All are less than the set decoding error probability threshold.

3. The wireless transmission method for coal mines according to claim 1, characterized in that, The decoding error probability of a data receiving end when receiving a data packet is determined by its corresponding code length, channel dispersion, Shannon capacity, and code rate; the data receiving end is either the legitimate data receiving end or the illegitimate data intercepting end, and the data packet is the public data packet, the privacy data packet, or the key data packet.

4. The wireless transmission method for coal mines according to claim 1, characterized in that, When solving the problem of minimizing the error probability, with As the objective, minimizing the error probability is equivalent to solving a problem containing only... This optimization problem with one optimization variable is solved to obtain... Then according to the constraints Calculated The solution.

5. A wireless transmission device for coal mines, characterized in that, include: The model building unit is used to construct a wireless transmission model for a coal mine. The wireless transmission model for a coal mine includes a data transmitter, a legitimate data receiver, and an illegitimate data interceptor. The data at the transmitter includes public data packets, privacy data packets, and key data packets. The privacy data packets and the key data packets are superimposed in the power domain using NOMA. The data stream multiplexed by NOMA and the public data packets are transmitted using TDMA. The minimization problem construction unit is used to construct an end-to-end error probability minimization problem for coal mine wireless communication based on the coal mine wireless transmission model, with a first code length and a second code length as optimization variables; the first code length is the code length allocated for the transmission of the public data packet, and the second code length is the code length shared by the privacy data packet and the key data packet; The calculation unit is used to solve the error probability minimization problem and obtain an optimized allocation scheme for the first code length and the second code length. The coal mine wireless transmission device is used to perform the steps in the coal mine wireless transmission method as described in any one of claims 1 to 4.

6. A communication system, characterized in that, The communication system includes a data transmitter, a legitimate data receiver, and an illegitimate data interceptor; the data transmitter is used to transmit public data packets with a first code length obtained by the coal mine wireless transmission method as described in any one of claims 1 to 4, and to transmit privacy data packets and key data packets with a second code length obtained by the coal mine wireless transmission method as described in any one of claims 1 to 4; and the privacy data packets and the key data packets are superimposed in the power domain using NOMA, and the data stream multiplexed by NOMA and the public data packets are transmitted using TDMA.

7. A storage medium, characterized in that, Used to store computer programs or instructions, which, when run on a computer, cause the computer to perform the coal mine wireless transmission method as described in any one of claims 1 to 4.

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