3results about How to "Excellent throughput" patented technology

The invention discloses a throughput optimization method and system for a deep space communication system, and relates to the technical field of deep space communication, and the method comprises the following steps: constructing an optimization problem; under a plurality of constraint conditions, randomly generating an initial population comprising a plurality of particles, and obtaining a fitness value of each particle; sorting each particle in the initial population according to the fitness values from large to small, and taking the first J particles as primary satellites of different sub-populations; performing multi-round iteration on the plurality of sub-populations; and after multiple rounds of iteration are completed, outputting optimal particles to obtain an optimal solution and a corresponding maximum throughput. According to the method, an initial population is divided into a plurality of sub-populations, and each sub-population is independently evolved by taking a primary satellite as a core; on the basis, each sub-population can carry out annular reconnaissance search in parallel, so that individuals can explore in multiple directions, and global search and local search strategies are further introduced, so that the population is balanced between global exploration and local development.

The application discloses a large-capacity low-energy-consumption unmanned aerial vehicle (UAV) covert communication method, and belongs to the technical field of UAV path planning and covert communication, and comprises the following steps: S1, constructing a system model of UAV covert communication; S2, constructing a UAV covert communication model; S3, constructing a motion energy consumption model of the UAV; S4, based on the system model, the communication model and the motion energy consumption model, finding a task target of the UAV, which is to find optimal transmitting power and a navigation track, so that the detection error probability of an eavesdropper is maximized, and an optimization problem and a constraint condition are constructed according to the same; and S5, solving the optimization problem by using a multi-objective deep deterministic policy gradient (MODDPG) algorithm. Under the premise that a communication link between a sender and a receiver is not detected by an eavesdropper, the application realizes the Pareto optimality of a link throughput and a motion energy consumption of the UAV, and provides security performance, communication performance and energy-saving performance guarantee for the UAV to carry out a task.

This invention provides an adaptive coding and modulation method for satellite communication based on link quality estimation, relating to the field of satellite communication. The method includes the following steps: Step S1: The transmitter generates and transmits a physical layer frame containing a pilot sequence; the receiver receives the physical layer frame and extracts the pilot sequence from it, estimating the mean and variance of the channel signal-to-noise ratio (SNR) based on the extracted and transmitted pilot sequences; Step S2: Based on the mean and variance of the channel SNR estimated in Step S1, the receiver queries a preset joint decision table to determine the coding and modulation scheme and pilot insertion frequency for the next frame, and feeds this information back to the transmitter to adjust the transmission strategy. This invention achieves optimal combined system throughput and reliability performance even when the channel state changes rapidly.