Cooperative NOMA terminal security communication scheme based on artificial noise

Abstract

The invention discloses a cooperative NOMA terminal security communication scheme based on artificial noise. The technical scheme comprises the following steps: step 1, establishing a communication rate relation function between an acquisition terminal and a master station as well as between the acquisition terminal and a listener; 2, quantizing a safety communication link requirement; step 3, power distribution of the edge nodes and the center node is carried out; and step 4, power distribution of the uplink secure communication acquisition terminal is carried out. According to the invention, the information transmission rate is maximized on the basis of ensuring safe communication between the terminal and the master station, so that safe, reliable and rapid transmission of electric power data is realized.

Description

[0001] The present invention relates to the field of intelligent grid demand - side secure communication technologies, and particularly to a collection terminal for remote wireless communication, and especially to a secure communication solution for an intelligent grid demand - side collection system. Background Art

[0002] Cooperative NOMA (Non - Orthogonal Multiple Access) is an advanced wireless communication technology. By introducing advanced technologies such as artificial noise, it can improve system capacity, increase spectral efficiency, enhance security performance, etc. However, in existing cooperative NOMA systems, the secure communication problem of terminals remains a challenge. Therefore, there is an urgent need for a secure communication solution for cooperative NOMA terminals based on artificial noise to solve this problem. Summary of the Invention

[0003] In view of the deficiencies and defects existing in the prior art, the present invention provides a secure communication solution for cooperative NOMA terminals based on artificial noise. This solution needs to be able to better understand the communication status of terminals in different situations, provide accurate communication services for the master station and eavesdroppers, and at the same time has the advantages of optimizing system performance, increasing system capacity, increasing spectral efficiency, reducing transmission power consumption, etc.

[0004] The object of the present invention can be achieved through the following technical solutions:

[0005] A secure communication solution for cooperative NOMA terminals based on artificial noise, comprising the following steps:

[0006] Step 1: Construction of the communication rate relationship function between the collection terminal, the master station, and the eavesdropper

[0007] First, through the communication rate relationship function between the collection terminal, the master station, and the eavesdropper, a demand model reflecting the communication capabilities of the terminal and the communication rate requirements of the master station and the eavesdropper is constructed. This communication rate relationship function can be collected and constructed based on the actual wireless communication environment and system parameters, and can truly reflect the communication status of the terminal and the communication requirements of the master station and the eavesdropper. By establishing this function, we can better understand the communication status of the terminal in different situations and provide accurate communication services for the master station.

[0008] The system model is an upstream acquisition network composed of a power grid master station and multiple acquisition terminals. According to the distance between the power grid master station and the acquisition terminals, it is further divided into central terminals and edge terminals. Assume that the acquisition network has N clusters, and each cluster contains one central terminal and one edge terminal. There are listeners monitoring the information of the edge terminals. The cooperative transmission network is divided into two time slots. In the first time slot, the edge terminal and the central terminal simultaneously transmit their own information and artificial noise information, and at the same time, the central terminal receives the information of the edge terminal. In the second time slot, the central terminal transmits the information of the edge terminal and artificial noise. The artificial noise occupies a certain proportion of the power. At the same time, considering that the central terminal will also cause mutual interference between different clusters when forwarding the information of the edge terminal. To improve the spectral efficiency of the acquisition network, each cluster will simultaneously use the same frequency-time resource block, and NOMA technology is adopted within each cluster to further improve the spectral efficiency.

[0009] The information received by the master station in the first time slot is:

[0010]

[0011] Among them, y i,e1 represents the signal received by the master station, is the communication coefficient between the i-th cluster edge terminal and the central terminal and the master station, p i,e 、p i,c represent the transmission powers of the edge terminal and the central terminal respectively, n i,e is Gaussian noise.

[0012] The information received by the master station in the second time slot is:

[0013]

[0014] The information received by the listener is:

[0015]

[0016] Among them, y E represents the information received by the listener, represents the channel coefficient between the edge terminal and the central terminal and the listener.

[0017] The receiving rate of the master station receiving the edge terminal in the first time slot is:

[0018]

[0019]

[0020] Among them is the receiving rate of the master station receiving the edge terminal in the first time slot, γ i,e1Let \(SINR_1\) be the SINR of the master station receiving the edge terminal in the first time slot, \(\alpha\) be the proportion of the transmit power occupied by the artificial noise, and \(N_0\) be the Gaussian noise.

[0021] The receiving rate of the master station in the second time slot is:

[0022]

[0023]

[0024] Where is the receiving rate of the master station in the second time slot, \(\gamma\) i,e2 is the SINR of the master station in the second time slot, and \(\alpha\) is the proportion of the transmit power occupied by the artificial noise.

[0025] The receiving rate of the master station receiving the central terminal information in the first time slot:

[0026]

[0027]

[0028] Where is the receiving rate of the master station receiving the central terminal information in the first time slot, \(\gamma\) i,c is the SINR of the master station receiving the central terminal information in the first time slot.

[0029] The receiving rate of the eavesdropper is:

[0030]

[0031]

[0032] Step 2: Quantify the requirements of the secure communication link

[0033] In the cooperative NOMA system, the requirements of the secure communication link are crucial. According to the communication rate requirements of the master station and the eavesdropper, as well as the communication capabilities of the terminals, the link requirements that meet the secure communication requirements are calculated to evaluate the quality and reliability of the secure communication link.

[0034] The transmission rate between the master station and the edge terminal is greater than the receiving rate of the eavesdropper

[0035]

[0036] Step 3: Perform power allocation between the edge node and the central node

[0037] In the cooperative NOMA system, power allocation is one of the key factors affecting the system performance. On the premise of ensuring the secure information transmission of the edge terminal, the transmission rate of the terminal uploading to the network is maximized:

[0038]

[0039]

[0040] Step 4: Perform power allocation for the uplink secure communication acquisition terminals

[0041] Uplink secure communication is one of the important links in the cooperative NOMA system. According to factors such as the communication capabilities of the terminals and the requirements of the master station for communication rate, the optimal transmit power of each uplink secure communication acquisition terminal is calculated. This power allocation scheme for uplink secure communication can effectively improve the transmission quality and reliability of the uplink, thereby ensuring the security and stability of the entire system.

[0042] To effectively optimize the problem where the objective function is a non-convex function, we can adopt the following comprehensive strategy: First, use the logarithmic approximation method to approximate the original non-convex function as a convex function, which can simplify its structure to a certain extent. Then, by introducing new variables, we transform this approximated convex function problem into a convex function maximization problem with new variables, which can further convert the problem into a more tractable format. Next, using the Lagrangian dual algorithm, we transform this convex function maximization problem into a more easily solvable dual problem and obtain an analytical solution. Finally, we substitute the obtained analytical solution into the original problem and gradually approach the true optimal solution through continuous iteration until convergence. Through this series of steps, we can systematically handle the non-convex function optimization problem and obtain a relatively accurate optimal solution.

[0043] The beneficial technical effects of the present invention: Some existing communication technologies are vulnerable to malicious attacks or eavesdropping and cannot guarantee the security and confidentiality of communication. Especially for communication systems that need to transmit sensitive information, this is an urgent problem to be solved. Aiming at these drawbacks, the purpose of the present invention in adopting cooperative NOMA technology is mainly to improve the efficiency and security of wireless communication systems, and at the same time enhance the security performance of the system by using artificial noise. In addition, this technology can also reduce the operation and maintenance costs and has good scalability, and can adapt to the development and demand changes of future communication technologies. Brief Description of the Drawings

[0044] Figure 1 is the model diagram of the present invention.

[0045] Figure 2 is the flowchart of the present invention. Detailed Embodiments

[0046] To make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the present invention.

[0047] As Figure 1 shown, a cooperative NOMA terminal secure communication scheme based on artificial noise includes the following steps:

[0048] Step 1: Construction of the communication rate relationship function between the acquisition terminal, the master station and the eavesdropper

[0049] First, by collecting the communication rate relationship function between the acquisition terminal, the master station and the eavesdropper, a demand model reflecting the communication capabilities of the terminal and the communication rate requirements of the master station and the eavesdropper is constructed. This communication rate relationship function can be collected and constructed based on the actual wireless communication environment and system parameters, and can truly reflect the communication status of the terminal and the communication requirements of the master station and the eavesdropper. By establishing this function, we can better understand the communication status of the terminal in different situations and provide accurate communication services for the master station.

[0050] The system model is an uplink acquisition network composed of a power grid master station and multiple acquisition terminals. According to the distance between the power grid master station and the acquisition terminals, it is divided into a central terminal and a peripheral terminal. Assume that the acquisition network has N clusters, and each cluster contains a central terminal and a peripheral terminal. There is an eavesdropper listening to the information of the peripheral terminal. The cooperative transmission network is divided into two time slots. In the first time slot, the peripheral terminal and the central terminal simultaneously transmit their own information and artificial noise information, and at the same time, the central terminal receives the information of the peripheral terminal. In the second time slot, the central terminal transmits the information of the peripheral terminal and artificial noise. The artificial noise occupies a certain proportion of the power. At the same time, considering that the central terminal will also cause mutual interference between different clusters when forwarding the information of the peripheral terminal. To improve the spectral efficiency of the acquisition network, each cluster will simultaneously use the same frequency-time resource block, and NOMA technology is adopted within each cluster to further improve the spectral efficiency.

[0051] The information received by the master station in the first time slot is:

[0052]

[0053] where y i,e1 represents the signal received by the master station, is the communication coefficient between the i-th clustered peripheral terminal and the central terminal and the master station, p i,e , p i,c respectively represent the transmission powers of the peripheral terminal and the central terminal, and n i,e is Gaussian noise.

[0054] The information received by the master station in the second time slot is:

[0055] The information received by the listener is:

[0056] where y E represents the information received by the listener, represents the channel coefficient between the edge terminal and the central terminal to the listener.

[0057] The receiving rate of the master station for receiving the edge terminal in the first time slot is:

[0058]

[0059]

[0060] where is the receiving rate of the master station for receiving the edge terminal in the first time slot, γ i,e1 is the SINR of the master station for receiving the edge terminal in the first time slot, α is the proportion of the transmission power occupied by the artificial noise, and N0 is the Gaussian noise.

[0061] The receiving rate of the master station in the second time slot is:

[0062]

[0063]

[0064] where is the receiving rate of the master station in the second time slot, γ i,e2 is the SINR of the master station in the second time slot, and α is the proportion of the transmission power occupied by the artificial noise.

[0065] The receiving rate of the master station for receiving the central terminal information in the first time slot:

[0066]

[0067]

[0068] where is the receiving rate of the master station for receiving the central terminal information in the first time slot, γ i,c is the SINR of the master station for receiving the central terminal information in the first time slot.

[0069] The receiving rate of the listener is:

[0070]

[0071]

[0072] Step 2: Quantify the requirements of the secure communication link

[0073] In the cooperative NOMA system, the requirements of the secure communication link are of vital importance. According to the communication rate requirements of the master station and the eavesdropper, as well as the communication capabilities of the terminals, the link requirements that meet the secure communication requirements are calculated to evaluate the quality and reliability of the secure communication link.

[0074] The transmission rate between the master station and the edge terminal is greater than the reception rate of the eavesdropper

[0075]

[0076] Step 3: Perform power allocation between the edge node and the central node

[0077] In the cooperative NOMA system, power allocation is one of the key factors affecting the system performance. On the premise of ensuring the secure information transmission of the edge terminal, the transmission rate of the terminal uploading to the network is maximized:

[0078]

[0079]

[0080] Step 4: Perform power allocation for the uplink secure communication acquisition terminals

[0081] Uplink secure communication is one of the important links in the cooperative NOMA system. According to factors such as the communication capabilities of the terminals and the communication rate requirements of the master station, the optimal transmit power of each uplink secure communication acquisition terminal is calculated. This power allocation scheme for uplink secure communication can effectively improve the transmission quality and reliability of the uplink, thus ensuring the security and stability of the entire system.

[0082] To effectively optimize the problem where the objective function is a non-convex function, we can adopt the following comprehensive strategy: First, use the logarithmic approximation method to approximate the original non-convex function as a convex function, which can simplify its structure to a certain extent. Then, by introducing new variables, we transform this approximated convex function problem into a convex function maximization problem with new variables, which can further convert the problem into a more tractable format. Next, using the Lagrangian dual algorithm, we transform this convex function maximization problem into a more easily solvable dual problem and obtain an analytical solution. Finally, we substitute the obtained analytical solution into the original problem and gradually approach the true optimal solution through continuous iteration until convergence. Through this series of steps, we can systematically handle the non-convex function optimization problem and obtain a relatively accurate optimal solution.

[0083] The above embodiments are illustrative of the specific embodiments of the present invention, rather than limitations thereof. Those skilled in the relevant art can make various transformations and changes without departing from the spirit and scope of the present invention to obtain corresponding equivalent technical solutions. Therefore, all equivalent technical solutions shall fall within the scope of patent protection of the present invention.

Claims

1. A cooperative NOMA terminal secure communication scheme based on artificial noise, characterized in that It includes the following steps: Step 1: Construct the communication rate relationship function between the acquisition terminal, the master station, and the listener; Step 2: Quantify the requirements for the secure communication link; Step 3: Perform power allocation between the edge node and the central node; Step 4: Perform power allocation for the uplink secure communication acquisition terminal.

2. The collaborative NOMA terminal secure communication scheme based on artificial noise according to claim 1, wherein The construction of the communication rate relationship function between the acquisition terminal, the master station, and the listener is specifically as follows: The system model is an uplink acquisition network composed of a power grid master station and multiple acquisition terminals. According to the distance between the power grid master station and the acquisition terminal, it is further divided into central terminals and edge terminals; the acquisition network has N clusters, and each cluster contains a central terminal and an edge terminal; there is a listener monitoring the information of the edge terminal; the cooperative transmission network is divided into two time slots. In the first time slot, the edge terminal and the central terminal simultaneously transmit their own information and artificial noise information, and at the same time, the central terminal receives the information of the edge terminal. In the second time slot, the central terminal transmits the information of the edge terminal and artificial noise. The artificial noise occupies a certain proportion of the power. At the same time, considering that the central terminal will also cause mutual interference between different clusters when forwarding the information of the edge terminal; in order to improve the spectral efficiency of the acquisition network, each cluster will simultaneously use the same frequency-time resource block, and the NOMA technology is adopted within each cluster to further improve the spectral efficiency; The information received by the master station in the first time slot is: where y i,e1 represents the signal received by the master station, is the communication coefficient between the i-th cluster edge terminal and the central terminal and the master station, p i,e , p i,c respectively represent the transmission powers of the edge terminal and the central terminal, n i,e is Gaussian noise; The information received by the master station in the second time slot is: The received information of the listener is: where y E represents the information received by the listener, represents the channel coefficients between the edge terminal and the central terminal and the listener; The receiving rate of the master station receiving the edge terminal in the first time slot is: Among them is the receiving rate of the master station in the first time slot for receiving edge terminals, γ i,e1 is the SINR of the master station in the first time slot for receiving edge terminals, α is the proportion of the transmit power occupied by artificial noise, and N0 is Gaussian noise; The receiving rate of the master station in the second time slot is: Among them is the receiving rate of the master station in the second time slot, γ i,e2 is the SINR of the master station in the second time slot, and α is the proportion of the transmit power occupied by the artificial noise; The receiving rate of the listener is: The receiving rate of the master station receiving the information of the central terminal in the first time slot: Among them is the receiving rate at which the master station in the first time slot receives the information of the central terminal, and γ i,c is the SINR at which the master station in the first time slot receives the information of the central terminal.

3. A secure communication scheme for cooperative NOMA terminals based on artificial noise according to claim 1, characterized in that, The quantification of the requirements for the secure communication link is specifically as follows: The transmission rate between the master station and the edge terminal is greater than the receiving rate of the listener:

4. A secure communication scheme for cooperative NOMA terminals based on artificial noise according to claim 1, characterized in that, The performance of power allocation between the edge node and the central node is specifically as follows: On the premise of ensuring the secure information transmission of the edge terminal, maximize the transmission rate of the terminal uploading network:

5. A secure communication scheme for cooperative NOMA terminals based on artificial noise according to claim 1, characterized in that, The performance of power allocation for the uplink secure communication acquisition terminal is specifically as follows: In order to effectively optimize the problem where the objective function is a non-convex function, the following comprehensive strategy is adopted: First, use the logarithmic approximation method to approximate the original non-convex function as a convex function, which can simplify its structure to a certain extent; then, by introducing new variables, transform this approximated convex function problem into a convex function maximization problem of a new variable, which can further convert the problem into a more easily processed format; next, use the Lagrangian dual algorithm to transform this convex function maximization problem into a more easily solvable dual problem and obtain the analytical solution; finally, substitute the obtained analytical solution into the original problem and gradually approach the true optimal solution through continuous iteration until convergence.

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