11 results about "Outage probability" patented technology

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.

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.

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.

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.

The application discloses a kind of electric power material scheduling method, system, equipment and medium, belong to electric power system field, method is: according to fire change tendency and base station position, the base station of existence power interruption risk is identified, obtain multiple risk base stations, the density data is obtained by carrying out density analysis to all risk base stations, combined with density data and the historical outage data of each risk base station is spatio-temporal joint analysis, obtain interruption probability distribution;The demand information of each risk base station is matched with inventory information and is analyzed, and resource coverage is obtained, if resource coverage is lower than preset threshold, then based on fire change tendency, interruption probability distribution and inventory information, from multiple risk base stations, determine that there is supply and demand imbalance in the target base station in the prediction time interval;Resource scheduling is carried out to each target base station, and the scheduling scheme station is obtained, therefore, by implementing the present application, the accuracy of base station interruption risk prediction can be improved, and then resource utilization and power safety are improved.

The application discloses a kind of multi-robot intelligent metasurface auxiliary lossy communication system optimization methods, first, under the framework of relevant Rayleigh channel, the spatial correlation of base station-IRS-user link is jointly modeled, the coupling channel matrix between the IRS reflecting unit carried by any robot is constructed using multidimensional correlated complex Gaussian variable, the distortion constraint is converted into SNR threshold using Shannon lossy theorem, and the outage probability closed form is derived;Second, the joint optimization is modeled as multi-agent Markov decision process MAMDP, and the IRS carried by each robot is an independent agent, which is centrally trained and distributedly executed using CTDE-TD3 algorithm;Finally, a low-complexity outage lower bound is given to realize real-time prediction.The application can realize multi-IRS cooperative regulation with low complexity and high robustness, significantly reduce the system outage probability, and provide theoretical support and practical tools for AI-oriented 6G communication system design and real-time optimization.

The application relates to a ground-unmanned aerial vehicle uplink transmission safety analysis method based on a directional beam antenna, which comprises the following steps: calculating a directional beam coverage volume formed by a source node, and modeling an active air eavesdropper as a homogeneous Poisson point process; constructing a fading channel model for a legal link and an eavesdropping link, obtaining a probability density function and a cumulative distribution function of channel power gain, defining an instantaneous receiving signal-to-noise ratio of a unmanned aerial vehicle relay end and a strongest eavesdropper end; defining a conditional secrecy outage probability lower bound form and a reliability outage probability, constructing a secrecy outage probability into a compound measurement form, and obtaining a secrecy outage probability expression; according to a change curve of the secrecy outage probability, system parameter selection basis can be provided for system designers according to actual requirements and system costs. The application can accurately depict low-altitude eavesdropping threats, realize computable evaluation of safety performance and beam width optimization, and provide engineering basis for related system design.

This invention relates to power grid lines, and more particularly to a discretized risk assessment method for power grid lines considering outage time. The method first uses maximum likelihood estimation to fit a Weibull probability density function based on historical fault data to reflect line aging and fault tolerance. Then, the outage time interval is discretized into equal parts, and the time-varying outage probability for each time period is extracted. For each discrete interval, the real-time severity quantification result, expected power loss, and time-varying outage probability are calculated simultaneously, and three-dimensional vector superposition is performed to obtain the individual risk contribution value. Finally, by performing a time-domain full integration of all individual risk contribution values, the final risk quantification assessment result of the line is output. This invention effectively reduces continuous modeling bias, achieves accurate quantification of probability characteristics and multi-dimensional consequences for different durations, and provides data support for power grid operation and maintenance decisions.

The present application relates to the technical field of power distribution network monitoring, and more particularly to a power distribution network outage early warning method based on multi-source data fusion, comprising: collecting historical operation data of the power distribution network; preprocessing the collected historical operation data; constructing a time series sample set based on the preprocessed data and labeling the corresponding outage label; constructing a double-path outage prediction model based on a long short-term memory network, wherein the double-path outage prediction model includes a basic risk path and a fault increment path, the basic risk path is based on numerical features for time series modeling, and the fault increment path is based on comprehensive coupling quantitative scoring for time series modeling; collecting real-time operation data of the power distribution network, inputting the preprocessed data into the double-path outage prediction model, outputting outage probability prediction values and triggering early warning. The present application realizes the deep fusion of multi-source heterogeneous data of the power distribution network and the accurate prediction of outage risk by constructing a coupling quantitative processing method of maintenance record text data and a double-path outage prediction model.

A relay cooperation interference security transmission method, system, device and medium based on multiple destination nodes, the method comprising: selecting an optimal destination node in a communication network topology graph, in the process of covert transmission, the source node sends a covert signal to the relay node, the relay nodes that can correctly decode the covert signal form a decoding set, when the decoding set is not empty, the best relay node is selected from the decoding set, and the covert signal is forwarded to the optimal destination node, the optimal destination node sends the received covert signal to other destination nodes in direct communication with it, while the cooperation interference node sends an interference signal to affect the eavesdropping of the covert signal by the eavesdropping node, and the SC and MRC spatial diversity technology is used to process the covert signal, and the outage probability and the interception probability in the whole covert transmission process are analyzed and derived; the system, device and medium are used to realize a relay cooperation interference security transmission method based on multiple destination nodes; the reliability and security of the covert transmission process are ensured.