30results about How to "Avoid emulation" patented technology

The invention discloses a performance analysis method of a UAV relay system based on spatial modulation. Aiming at the UAV relay system based on spatial modulation, a system is established in which the system experiences the Rice channel under the condition of no direct link. model; according to the definition of the joint bound, the system bit error rate is divided into three different error cases, and according to the probability density function and cumulative distribution function of the channel information, the calculation method of the system bit error rate joint bound is given, and further The calculation method of the approximate bit error rate joint bound of the system under high signal-to-noise ratio is given; the diversity degree of the system is given according to the approximate bit error rate joint bound of the system under high signal-to-noise ratio; The proposed performance analysis method can effectively evaluate the bit error rate performance of the system.

The invention relates to a frequency comprehensive device behavior level modeling method considering noise source affect, belonging to the technical field of wireless transmission communication. In order to improve the traditional behavior level modeling method carried out for a sigma-delta fraction N frequency comprehensive device in the prior art, the method provided by the invention comprises the steps of: modeling a phaselocked loop system of the sigma-delta fraction N frequency comprehensive device with jitter noise; and modeling a sigma-delta demodulator. The technical scheme of the invention greatly helps a designer design a circuit, and is convenient for early estimating the influence of the phase noise of the frequency comprehensive device to the whole wireless communication system. The invention can ensure that a circuit designer carries out the rapid simulation to obtain system performances, especially noise performance, thereby avoiding using simulators of SPICE, SpectraRFand the like with very low speed for simulation. The invention can be used for accelerating the design process of the sigma-delta fraction N frequency comprehensive device from top to bottom so as toensure that the designer accurately predicts the system performances as early as possible, especially indexes of the phase noise and the like.

The invention discloses a unit quick selection method of an opportunity array antenna and solves the problem that existing opportunity array antenna units are difficult to be selected quickly. The unit quick selection method includes: setting parameters; determining beam width: determining half-power beam width through unit simulation; randomly selecting an antenna unit, and setting an initial value; performing outside-unit normal vector solving to serve as an antenna radiation direction; calculating an included angle between the maximum radiation direction and a beam pointing direction, wherein the included angle is taken as a selection basis; judging whether to select for comparison or not, and calculating the included angle within a range being half of the half-power beam width to meetrequirements of the selection antenna unit; judging whether search is completed or not: detecting whether all antenna units are already searched or not; completing antenna unit selection to quickly acquire a proper antenna unit. A radiation unit is accurately and quickly selected under a given scanning angle by combining with an antenna unit radiation direction diagram, efficient and effective unit selection is realized, and the unit quick selection method is used for the field of radar and detection by utilizing antennas.

The invention relates to the technical field of three-pin automatic impedance matching, in particular to a fast three-pin automatic impedance matching system. The fast three-pin automatic impedance matching system includes the following steps: 1) establishing a three-pin waveguide equivalent circuit; 2) establishing a circuit parameter relationship; 3) designing a matching algorithm. The invention directly establishes the mathematical relationship among the reflection coefficient, load impedance, pin depth and S parameter of the three-pin waveguide, and can quickly calculate the scattering parameter and load impedance according to the reflection coefficient and the pin depth, thereby realizing fast impedance matching calculation. Based on the equivalent circuit method and numerical calculation, the invention can greatly reduce the amount of computation, simplify the design process of automatic impedance matching, does not require a database, and can be widely used in pin waveguides of different sizes.

The invention discloses a double-step Monte Carlo simulation method applied to radioactive ray dose computation. The double-step Monte Carlo simulation method comprises the following steps: step 1, performing Monte Carlo simulation, thereby acquiring valid seed numerical array; step 2, after acquiring the valid seed numerical array in the step 1, by utilizing valid seed numerical values, performing secondary Monte Carlo simulation and computing radioactive ray dose distribution inside the human body at a high speed. The invention provides a double-step Monte Carlo simulation algorithm; simulation of photons acted on a tumor region according to the valid seed numerical values can be performed, and simulation of photons without passing through the tumor region is avoided, so that computational efficiency is improved.