91 results about "Outage probability" patented technology

The invention relates to the technical field of smart power grids, and provides a power distribution network power failure probability analysis and resource scheduling optimization method based on a knowledge graph, which realizes minute-level node association weight updating through a streaming updating mechanism, and remarkably improves the power failure risk identification accuracy in extreme weather by combining with dynamic adjustment of a meteorological risk function. A topology / environment double-attention architecture is adopted to fuse multi-source features, so that the fusion efficiency of equipment node features and environment node features is improved; and a fault deduction model with dynamic weight constraint is introduced, so that the secondary fault early warning capability is enhanced. In a resource scheduling link, a mixed integer programming model of a carbon emission factor and island power balance constraint is integrated, and Pareto optimization of first-aid repair efficiency and an environmental protection target is realized. Through transfer learning, knowledge graph cross-region adaptation is realized, and the novel transformer area access error is controlled to be reduced in a distribution network reconstruction scene. The method supports minute-level topology reconstruction and second-level weight updating, has low delay and high expansion capability, and is suitable for provincial power grid real-time deployment.

The invention discloses an unmanned aerial vehicle cluster relay system optimization method, and aims to significantly reduce the overall outage probability of the system by performing adaptive optimization on cooperative position deployment and flight trajectories of multiple unmanned aerial vehicles under multiple actual constraint conditions of flight speed, safety distance, flight boundary and the like. Therefore, the reliability and the service quality of the multi-unmanned aerial vehicle relay communication network are improved. According to the method, a Markov decision process (MDP) model is constructed, a multi-unmanned aerial vehicle trajectory optimization problem is converted into a multi-agent reinforcement learning problem, and efficient optimization of unmanned aerial vehicle trajectories is realized by using a centralized training-distributed execution framework, so that the outage probability of a communication system is minimized.

The present invention discloses a device-to-device covert communication system assisted by a drone and an intelligent reflecting surface, establishes a drone and intelligent reflecting surface UIRS joint-assisted D2D covert communication model, including communication links between various entities, calculates the average minimum error detection probability and the maximum communication rate; the sender sends a covert signal to the UIRS, and the UIRS forwards it to the receiver. Among them, the UIRS changes the angles of the corresponding incident covert signal and the reflected covert signal through its constituent elements; the spectrum-sharing cellular user sends a cellular signal to the base station, and at the same time the base station sends an interference signal, introducing an uncertainty factor at the receiver of the eavesdropper Willie to achieve the covertness of the UIRS joint-assisted D2D communication link; the eavesdropper Willie monitors whether the UIRS joint-assisted D2D communication link transmits a covert signal; the covertness is measured by the average minimum error detection probability; under the multiple constraints of satisfying the average minimum error detection probability, the cellular communication link outage probability, the transmission power, and the transmission power of the interference signal, etc., the maximum communication rate of the UIRS joint-assisted D2D communication link is obtained, and the communication rate of the system is effectively improved under the joint assistance of the drone and the intelligent reflecting surface UIRS.

The invention discloses a secure communication method for eavesdropping a D2D relay NOMA network. The communication process has two time slots; in the first time slot, the information source equipment sends an NOMA signal, and the multi-antenna relay equipment selects one antenna to send an interference signal to resist eavesdropping attack; in the second time slot, the relay equipment adopts the digital network coding technology to mix the interference signal of the first time slot and the decoded information source message, then adopts the NOMA technology to construct a novel NOMA signal, and re-selects one antenna to send the NOMA signal, and meanwhile, the information source sends another interference signal to weaken the eavesdropper; the NOMA user equipment and the eavesdropper calculate a required signal-to-noise ratio and a required signal-to-interference-and-noise ratio, and calculate a system outage probability and an eavesdropping probability; according to the invention, the two NOMA users can realize physical layer security communication in the D2D network, and the security of the physical layer is far better than that of a security communication scheme based on non-cooperative interference and a traditional security communication scheme based on cooperative interference.

The invention discloses a resource allocation method of STAR-RIS assisted cellular-free mMIMO (multiple input multiple output). The method comprises the following steps: acquiring position information of UE, AP and STAR-RIS, acquiring channel state information (CSI) of each communication link, and constructing a state information set of a current system based on the position information and the CSI; based on the state information set, utilizing an Actor network in a depth deterministic policy gradient (DDPG) algorithm to generate an optimization action; adjusting resources among the UE, the AP and the STAR-RIS on the basis of the optimization action, performing downlink signal transmission on the basis of the adjusted resources, and calculating the outage probability, the SINR and the information transmission rate per unit time of the UE; and outputting an instant reward value under the optimization action based on the outage probability, the SINR and the information transmission rate, and performing updating optimization based on the instant reward value. According to the invention, the technical problem of poor performance of a traditional cellular-free large-scale MIMO communication system is solved.

The invention relates to a mobile antenna communication system robust resource optimization method based on angle information uncertainty, and belongs to the field of wireless communication. The method comprises the following steps: constructing a mobile antenna communication system model, and establishing a system energy efficiency maximization resource allocation model based on bounded angle information uncertainty by considering base station transmitting power constraint, user rate constraint, channel uncertainty constraint and mobile antenna spacing constraint; a non-convex original problem is equivalently converted into a convex subproblem about base station beam forming and movable antenna positioning by using transformation replacement, Bukbach, exponential conversion, continuous convex approximation, an S process, a subgradient inequality, singular value decomposition and a block coordinate descent method; and solving a plurality of convex sub-problems by using the CVX to obtain an optimal beam forming matrix and a movable antenna position vector, namely an optimal resource allocation strategy. The energy efficiency of the mobile antenna system can be effectively improved, and compared with a traditional method, the communication outage probability can be effectively reduced.

The invention discloses a relay unmanned aerial vehicle track optimization method, which comprises the following steps of: firstly, constructing a lossy relay unmanned aerial vehicle communication system model under finite length coding, and covering communication time slot division, unmanned aerial vehicle flight constraint and a channel model; deducing outage probability expressions of two communication strategies under finite length coding, wherein the outage probability expressions are an independent decoding strategy and a joint decoding strategy respectively; then, a trajectory optimization problem is converted into a Markov decision process (MDP), and a state space, an action space, a reward function and a state transition mechanism are clarified; solving by adopting a joint optimization algorithm based on depth deterministic strategy gradient (DDPG) to realize joint optimization of the unmanned aerial vehicle track and the communication strategy; and finally, outputting an optimal unmanned aerial vehicle track and strategy configuration to provide reference for actual system deployment. The method can effectively reduce the outage probability of the system and improve the communication reliability under the condition of limited length coding, and is suitable for various scenes in 6G and future air-ground cooperative communication networks.

The invention discloses an optimal concealment rate optimization method based on a time slot cognitive star-air-ground fusion network, and the method comprises the steps: firstly, enabling a satellite to select an unmanned aerial vehicle relay with the maximum channel gain as a forwarding unmanned aerial vehicle relay through the instantaneous channel state information of a link between an unmanned aerial vehicle relay and a satellite; in a second time slot, by means of a main link between the forwarding unmanned aerial vehicle relay and the main user, the forwarding unmanned aerial vehicle relay overlays the hidden message sent by the satellite to the NOMA secondary user with the message of the main user and then forwards the message downwards; a closed expression of a detection error probability, an interruption probability and an effective hiding rate of an eavesdropper is deduced, a power optimization problem is constructed and solved, and the effective hiding rate of two-hop hiding transmission is maximized by optimizing a power distribution factor. According to the method, the concealment performance of the cognitive star-sky-ground fusion network can be remarkably improved.

The invention discloses a transformer substation risk prediction method and device, equipment and a storage medium, and belongs to the technical field of transformer substation risk prediction, and the method comprises the steps: receiving target multi-source data of a transformer substation; on the basis of the risk prediction model, the accumulated water depth, the damage degree and the outage probability of the transformer substation are predicted according to the target multi-source data; the risk prediction model is used for extracting time features and spatial position features of target multi-source data to obtain spatio-temporal features; embedding the spatio-temporal features into dynamic data to obtain spatio-temporal dynamic data; key features are screened out after the space-time dynamic data and the static data are coded and fused; extracting a semantic vector of the text data; and carrying out coding fusion on the key features and the semantic vectors to obtain fusion features, and carrying out multi-branch decoding identification on the fusion features to obtain a risk prediction result of the transformer substation. According to the method, after time and space features of multi-source data are embedded, dynamic features, static features and text features are extracted to predict risks of multiple different dimensions.

The invention discloses an air-space-ground Internet of Things performance analysis method and system based on SWIPT and NOMA, and belongs to the technical field of air-space-ground integrated Internet of Things. Comprising the following steps: constructing an air-space-ground Internet of Things system model comprising an LEO satellite, an unmanned aerial vehicle relay and a ground user, and considering heterogeneous channel characteristics and node dynamics; deducing a closed-form solution of the outage probability of the system through joint transformation of a moment generation function and a characteristic function of a random variable; a high-order Taylor expansion and moment matching method is adopted to carry out approximation on the closed-form solution, a first-order approximate solution and a second-order approximate solution are obtained, and an upper bound of an approximate error is deduced. According to the method, the problem of accurate modeling of the outage probability under heterogeneous link coupling in the air-space-ground Internet of Things is solved, theoretical preciseness and engineering practicability are both achieved, and an effective tool is provided for network reliability analysis and optimization.

The invention provides a hidden NOMA communication method based on STAR-RIS partition cooperative interference, and the method comprises the steps: building a STAR-RIS assisted hidden communication system, and enabling the STAR-RIS to be virtually divided into an enhanced transmission region and a cooperative interference region; calculating the communication interruption probability of the hidden user, and simplifying the communication interruption probability by utilizing the probability distribution of the intermediate variable; based on a binary hypothesis testing problem, determining a receiving signal and average receiving power of a malicious monitor, determining a minimum detection error probability of the malicious monitor adopting an optimal detection strategy, and calculating a lower bound of the minimum detection error probability; determining a concealment constraint; and establishing an optimization problem according to the communication interruption probability and the concealment constraint of the concealed user, and solving the optimization problem by adopting an alternating iterative optimization algorithm to obtain the optimal values of the power distribution coefficient and the area unit number of the enhanced transmission area. According to the invention, the transmission reliability and concealment can be improved by using the information relay and interference dual functions of STAR-RIS, and the spectrum utilization rate can be improved through regional cooperation.

The invention discloses a comprehensive assessment method for weak links of a power system involving multi-dimensional indexes in extreme weather. The method comprises the following steps: firstly, establishing a multi-dimensional index system containing safety and optimized operation, wherein the system covers the line outage probability, the load loss probability, the electric energy insufficiency expectation, the line heavy load rate and the network loss rate; secondly, constructing a line fault model and a cascading fault model under extreme storm weather, describing fault probability change in combination with a Gaussian function and Weibull distribution, and simulating line segment failure by adopting Poisson distribution; a system state after a fault is calculated through a direct-current optimal power flow model, and a large amount of simulation data is obtained in combination with a non-sequential Monte Carlo method. Furthermore, a fuzzy analytic hierarchy process and a CRITIC method are adopted to calculate subjective and objective weights respectively, subjective and objective comprehensive evaluation is realized through weight fusion, and weak links of the system are identified. The method gives consideration to evaluation scientificity and calculation efficiency, and is suitable for real-time risk evaluation and weak link identification of a large-scale power system in extreme weather.

A double-lane millimeter wave vehicle networking safety transmission method, system, device and medium based on STAR-RIS, the method comprising: constructing a STAR-RIS assisted double-lane millimeter wave vehicle networking communication scene; based on the propagation characteristics of millimeter wave signals, combining the channel fading characteristics under the conditions of line-of-sight and non-line-of-sight transmission and the transmission and reflection functions of STAR-RIS, calculating the channel gain of the cascaded channel of the STAR-RIS assisted link; based on the random geometry theory, respectively calculating the probability density functions of the associated distances of the direct link, the STAR-RIS reflection link and the STAR-RIS transmission link; constructing a dynamic link association strategy supporting ternary selection; establishing a signal-to-interference-and-noise ratio model under three association modes; combining the physical layer security performance index definition, calculating the closed-form analytical expressions of the connection interruption probability and the secrecy interruption probability, and verifying the security gain of STAR-RIS; the present application has the advantages of effectively overcoming the half-space coverage blind area of the traditional reflective RIS, and improving the link connection reliability and physical layer safety transmission performance under the double-lane complex shielding environment.

Techniques are described for implementing free space optical (FSO) ground-to-satellite communications. In general, an optical ground station communicates optically with a satellite via a ground-to-satellite FSO communication link. Embodiments described herein deploy at least two FSO relays at one or more aerial platform altitudes to effectively segment the ground-to-satellite FSO communication link into three or more FSO sub-links. Each FSO sub-link has better optical link performance (e.g., lower outage probability) than a single direct link. The FSO relays can include tropospheric FSO relays on low-altitude platforms and / or stratospheric FSO relays on high-altitude platforms, and architectures can use the FSO relays in a serial and / or parallel manner.

The present invention belongs to the field of intelligent transportation technology, and specifically discloses a channel resource allocation method and system based on hierarchical reinforcement learning. The present invention proposes a fairness model based on Jain's fairness index, which is used to measure the fairness of resource allocation and ensure that the resource allocation between different vehicles is relatively balanced; a reliability model is established, which measures the probability of successful transmission of information within a specified time by introducing the concept of interruption probability, thereby ensuring the communication needs of the V2V link; a delay model is designed based on the information age AOI model, which is used to evaluate the time it takes for information to be generated and received, so as to ensure timely transmission of information. The present invention also constructs a cellular vehicle network channel resource allocation model based on hierarchical reinforcement learning. Through hierarchical design, the model decomposes the cellular vehicle network channel resource allocation problem into an upper-layer clustering problem and a lower-layer intra-cluster channel resource optimization problem, thereby ensuring fair and efficient resource allocation in a complex environment.

The invention provides a performance analysis method of a multi-RIS-assisted underwater wireless optical communication system under an RIS selection scheme. The performance analysis method comprises the following steps: establishing a multi-RIS-assisted underwater wireless optical communication system model under the RIS selection scheme; the method comprises the following steps: deriving a cumulative distribution function expression of an instantaneous signal-to-noise ratio between a source node and a destination node based on a multi-RIS-assisted underwater wireless optical communication system model under an RIS selection scheme; deriving a probability density function expression of an instantaneous signal-to-noise ratio between a source node and a destination node; based on the cumulative distribution function and the probability density function expression of the instantaneous signal-to-noise ratio, deriving to obtain an analytical expression of the outage probability and the M-PAM average bit error rate, and based on the obtained analytical expression, analyzing the performance of the outage probability and the M-PAM average bit error rate of the multi-RIS-assisted underwater wireless optical communication system under the RIS selection scheme. The invention shows the potential advantage of integrating multiple RISs into an underwater wireless optical communication system.

This invention discloses a method for adjusting the active port, calculating the interruption probability, and calculating the interruption rate of shortwave communication based on a manifold antenna system in the field of wireless communication technology. The method includes: obtaining the architectural parameters of the target manifold antenna system, which include N ports uniformly distributed along a linear dimension W, each port sharing a common radio frequency link; calculating the instantaneous channel gain of each port; and selecting the port with the maximum instantaneous channel gain as the active port for shortwave communication. By introducing a manifold antenna, this invention achieves dynamic spatial adaptability within a limited area. Unlike traditional arrays with static elements, the FAS utilizes spatial diversity through real-time reconfiguration of antenna positions, eliminating the need for multiple radio frequency links. It also utilizes ionospheric reflection to establish beyond-line-of-sight connections. The FAS dynamically adjusts its active port to optimize reception from different refraction points, mitigating the inherent fading and signal attenuation of high-frequency skywave channels.

The invention discloses an uplink outage probability analysis method and system for an unmanned aerial vehicle cooperating with a wolfberry picking trolley, and the method comprises the steps: constructing a joint effect model in a non-static multi-input multi-output scene, and determining an unmanned aerial vehicle and wolfberry picking trolley uplink cooperative communication scheme for achieving the maximum channel gain; deducing to obtain an uplink outage probability closed expression containing transmitting power, interference statistical characteristics and mobility parameters by adopting an interference statistic calculation method based on Laplacian transformation; based on the obtained uplink outage probability closed expression, an improved Gaussian approximation method is adopted, and an uplink outage probability approximate expression is obtained through a dynamic truncation criterion; and based on the obtained uplink outage probability approximate expression, obtaining the total error upper bound of approximate errors by using Gaussian approximation errors and space average errors, and realizing efficient and accurate evaluation and guaranteeing the reliability of agricultural automation communication through dynamic interference modeling and improved Gaussian approximation.

The invention provides an ISAC near-field channel robust beam forming optimization method and device based on MMSE estimation. The method comprises the following steps: carrying out system modeling and signal configuration on an ISAC system; accurately modeling a near field communication channel by adopting a spherical wave model, calculating to obtain an SINR (Signal to Interference plus Noise Ratio) of a user, and introducing an outage probability constraint; establishing a sensing model under a far-field condition, and estimating a target response matrix by adopting an MMSE criterion to obtain a sensing MSE; introducing an enhanced waveform to improve the perception DoF, and updating the SINR; an enhanced covariance matrix is introduced, the minimum perception MSE is used as an optimization target, the outage probability constraint, the total power constraint and the positive semi-definite constraint updated according to the updated SINR are used as constraint conditions, and an ISAC near-field channel robust beam forming optimization problem is constructed; a non-convex problem is converted into a convex form through combination of semi-definite relaxation SDR and an optimization framework of a spherical boundary and S-lema, and a beam forming optimization matrix is solved and obtained by obeying the constraint of a linear matrix inequality LMI. According to the invention, beam forming can be optimized.

The invention relates to the field of resource allocation methods of communication systems, in particular to a distributed RIS-assisted millimeter wave communication optimization method based on adaptive information theory fusion, which comprises the following steps: constructing a distributed RIS-assisted millimeter wave communication optimization system; calculating LOS path loss based on a random positioning obstacle; calculating RIS path loss based on the attenuation characteristic of the transmission medium; estimating the outage probability of the system based on an adaptive information theory fusion algorithm, and calculating the overall loss of the system by taking the outage probability as a communication performance index; according to the method, the loss model of each path is refined, the influence of random shielding is quantified according to the actual situation, the loss model is divided into single-path shielding calculation, and transmission medium absorption attenuation and obstacle shielding loss are combined into a unified attenuation item in combination with a scene for processing multi-path shielding, so that the modeling complexity of multi-factor superposition is simplified.

This invention discloses a method and apparatus for resource allocation in a non-orthogonal multiple access system assisted by a fluid antenna, relating to the fields of wireless communication and power transmission technology. The method includes: S1 constructing a non-orthogonal multiple access system assisted by a fluid antenna; S2 determining a transmission channel model; S3 constructing an objective function; and S4 analyzing the objective function based on a genetic algorithm to obtain power allocation results. The introduction of a fluid antenna and optimization of the non-orthogonal multiple access system, maximum ratio combining, and power allocation coefficients significantly improve the overall performance of the non-orthogonal multiple access system. The spatial freedom provided by the fluid antenna effectively enhances channel quality, resulting in a significantly lower overall system outage probability compared to traditional fixed antenna systems, while also ensuring fairness between the two users in the system. The power allocation coefficient solution method based on a genetic algorithm solves problems that traditional gradient-based optimization methods cannot address, enabling the system to exhibit superior system outage probability under different antenna port numbers and antenna conditions.

The present application relates to a kind of unmanned aerial vehicle-multiple orbit satellite uplink transmission interruption performance analysis method.The orbit parameters of multiple orbits where satellite is located are obtained;The probability density of the distance between unmanned aerial vehicle and satellite in respective orbit is determined based on the orbit parameters;The probability density function and cumulative distribution function representing the distance distribution between unmanned aerial vehicle and satellite in respective orbit are derived based on the probability density;Based on the overlapping interval between multiple orbits, the probability density function and cumulative distribution function of the distance between unmanned aerial vehicle and satellite in multiple orbits are expressed in a segmented manner, which accurately describes the distance distribution between satellite and unmanned aerial vehicle;The outage probability of satellite communication link is calculated by combining the segmented expression with the signal-to-noise ratio distribution characteristics of satellite communication link.The present application quantitatively analyzes the influence of satellite orbit parameters and signal transmission power and other system parameters on the outage probability of satellite communication link through the closed-form expression of the outage probability of unmanned aerial vehicle-multiple orbit satellite uplink transmission communication link.

The invention relates to the technical field of controlled infrastructure administrative management, and discloses a charging pile management method and device, and the method comprises the steps: obtaining a node state data sequence of a target controlled infrastructure node, and calculating a performance derating coefficient representing the physical loss of assets; reading an administrative resource pool containing a multi-level service protocol, and obtaining a service sensitivity weight of a service initiation subject; determining a commercial outage probability according to the performance derating coefficient, and when the commercial outage probability is in a preset warning interval, calling a performance beacon and triggering an asymmetric matching program; coupling the service sensitivity weight and the performance derating coefficient to generate an administrative decision arbitration result, thereby granting a limited access permission and scheduling resource transactions in a sub-health mode; according to the invention, mapping from physical loss to commercial value is realized through an administrative arbitration mechanism, and flexible balance between asset integrity and service fulfillment is achieved.

The present invention relates to a dual-RIS-assisted backscatter communication robust transmission method, which belongs to the field of backscatter communication. The method includes: constructing a dual-RIS-assisted wireless power backscatter communication system model; considering the maximum transmission power constraint of the power station, the transmission power constraint of the backscatter device, the RIS phase shift constraint, the channel uncertainty constraint and the energy collection constraint, establishing a system energy efficiency maximization resource allocation model based on bounded channel uncertainty; using the S process and Cauchy inequality to convert the uncertainty non-convex optimization problem into a deterministic problem; using the Dinkelbach method to convert the fractional programming problem into a subtraction form; using the semi-definite relaxation method, the penalty concave-convex process method and the alternating optimization method to convert the non-convex optimization problem into an equivalent convex optimization problem. The present invention can effectively improve the total energy efficiency of the system while reducing the probability of communication interruption under the condition of channel uncertainty in the wireless power backscatter communication system.

The invention discloses an RSMA wireless communication system secure transmission method based on STAR-RIS, and belongs to the technical field of wireless communication. Based on a related Rayleigh fading channel model, a cascade channel average gain from a base station to a user through STAR-RIS is firstly deduced, a simplified analysis method is provided, the average channel gain is directly used for deducing a closed expression of a system security outage probability (SOP), and the secure diversity gain characteristic of the system is further determined by analyzing the asymptotic SOP of a high signal-to-noise ratio area; the security performance of the method is obviously better than that of an STAR-RIS assisted NOMA scheme and an STAR-RIS assisted OMA scheme, and the flexible resource allocation mechanism of the method has more advantages in interference control and secure transmission guarantee; according to the method, the power distribution coefficients of the public information and the private information of the RSMA are optimally designed, the rate and power ratio of the two types of information streams can be dynamically and flexibly adjusted according to the actual situation, and the appropriate balance of the transmission security of the two types of information streams is realized.

The invention relates to a relay selection method based on Q-learning in an energy limited network, and belongs to the technical field of communication. Firstly, an energy-limited network energy consumption model is constructed; secondly, deriving the outage probability of the energy-limited network; and finally, introducing Q-Learning into a relay selection stage, and proposing a Q-Learning-based relay selection strategy (QRSS) under the energy-limited network to select an optimal relay, and the strategy enables an intelligent agent to learn an optimal relay selection scheme through training. Simulation results show that the method is superior to a random relay selection strategy (RSS) in throughput, data transmission reliability, node residual energy and other performances.

The application discloses a kind of ISAC heterogeneous service scene under power terminal intelligent resource allocation method and system, the method includes according to CT link channel model calculation CT user transmission rate, using finite block length channel coding scheme to solve ST service can be realized transmission rate, analysis ST delay demand, design ST outage probability constraint, introduce proportion fair algorithm, build CT and ST service collaborative resource allocation model, set corresponding Markov model parameter, the Markov model parameter includes state space, action space and reward function, utilize the double-delay deep deterministic policy gradient algorithm based on proportion fair, solve optimal resource allocation scheme;The application is a kind of highly reliable scheduling mechanism, in the case where resource is limited, different service heterogeneous demand can be effectively met, while satisfying the low delay demand of ST service, the data rate of CT service is maximized.

The application discloses a kind of establishment methods of intelligent reflecting surface assisted wireless energy supply communication system for wireless body area network, method includes: constructing the initial wireless energy supply communication system model consisting of wearable device, access point and equipped with N reflecting element intelligent reflecting surface;Based on the channel parameters in wireless energy supply communication system model, construct channel path loss distribution;Using matrix matching method, determine composite channel distribution function based on channel path loss distribution;Under the preset threshold and constraint condition, the outage probability in information transmission process is calculated in combination with channel parameters and composite channel distribution function, to determine the target reflecting element data of intelligent reflecting surface, and then determine the target wireless energy supply communication system model to carry out wireless transmission.The wireless energy supply communication system established by the application can significantly improve the energy collection performance of WET network while improving the efficiency of energy transmission.

The invention provides an unmanned aerial vehicle resource optimization method and device based on outage probability spatial modeling, and the method comprises the steps: building a sight distance probability model through employing a parameterized S-shaped curve function based on a pitch angle; constructing a large-scale fading model according to the sight distance probability model and the safety margin; establishing a small-scale fading model based on the Rice factor and the pitch angle; building an outage probability space according to the large-scale fading model and the small-scale fading model, and determining an unmanned aerial vehicle reachable area according to the outage probability space; and carrying out unmanned aerial vehicle resource optimization based on the outage probability space in an unmanned aerial vehicle reachable area. According to the method, the reliability and the resource utilization efficiency of the unmanned aerial vehicle relay communication system in a complex urban environment can be effectively improved.

This invention discloses a RIS-assisted downlink transmission method for UAV air-to-ground network security. The method includes: constructing a large-scale channel gain for the UAV-RIS link; implementing optimal phase configuration and beamforming for legitimate users based on CSI; calculating the received signals and instantaneous signal-to-noise ratio for legitimate users and effective eavesdroppers; introducing a channel statistical model to model the statistical characteristics of channel fading and node locations and derive the link distance PDF; deriving a closed-form expression for the Standard Operating Procedure (SOP) in scenarios with random eavesdropper locations and numbers; and performing precise quantitative analysis of system security performance based on the closed-form expression, dynamically adapting and updating the RIS phase configuration and receiver strategy. This invention effectively corrects the security assessment distortion problem of traditional methods, achieves accurate characterization of the security interruption probability in scenarios with uncertain eavesdropper locations and numbers, reduces the system security interruption probability, and improves transmission security and robustness. It is applicable to UAV air-to-ground secure communication in an integrated air-space-ground architecture.