17 results about "Power gain" patented technology

This invention provides a robust resource scheduling method, apparatus, and device for satellite communication systems, relating to the field of wireless communication technology. The method includes: acquiring real-time environmental data and the channel coefficients at the current moment; determining the channel parameters corresponding to the real-time environmental data using an environment-parameter correspondence table, the channel parameters including the channel time correlation coefficient and the innovation process variance; calculating the statistical characteristics of the channel coefficients at the time to be transmitted based on the channel coefficients and channel parameters at the current moment; constructing a probabilistic constraint relationship using a one-sided Chebyshev inequality based on the statistical characteristics and a preset confidence parameter, calculating the minimum channel carrying power gain at the time to be transmitted that satisfies the preset probability guarantee; and performing resource scheduling based on the minimum channel carrying power gain at the time to be transmitted using a robust proportional fair scheduling algorithm. This invention can improve resource scheduling efficiency.

This invention relates to a machine learning-based modeling method for cloud wireless access networks, comprising: acquiring a remote cloud wireless access network transmitter; improving the remote cloud wireless access network transmitter by replacing the traditional microwave source with a dual-ring opto-oscillator to suppress side modes through single-mode oscillation; and introducing a directly modulated laser after an arbitrary waveform generator to utilize the chirp effect and fiber dispersion to generate power gain; and modeling the millimeter-wave signal spectrum of the improved remote cloud wireless access network transmitter based on a lightweight gradient booster model to match the dimensions of input and output features. This invention uses a dual-ring opto-oscillator to replace the traditional microwave source, reducing phase noise; utilizes the synergistic gain behavior of the directly modulated laser chirp and fiber dispersion to improve the transmission gain of the millimeter-wave signal; and models the spectral characteristics of the millimeter-wave signal using a lightweight gradient booster model to achieve spectrum prediction.

The application relates to the technical field of coding switch signal transmission, and discloses a coding switch signal transmission method and system based on narrowband Internet of Things, which comprises the following steps: acquiring wireless channel original data containing signal strength and noise interference, and obtaining a channel quality score through weighted fusion; if the score is lower than a preset threshold, interference analysis is performed on the noise interference data to obtain a channel state parameter and a quality decline duration; channel risk assessment is completed in combination with historical reference data to obtain a deterioration risk value and adaptively generate an adaptive adjustment coefficient; when the influence of device load on transmission exceeds a preset condition, a preliminary power is corrected in combination with a power gain value and the adjustment coefficient; if the preliminary power exceeds an upper limit of resource constraints, a final transmission power is obtained by being lowered according to transmission characteristic parameters, data packets are transmitted according to the final transmission power, feedback is collected, and a transmission state result is obtained. The method can realize high-reliability transmission of coding switch signals in a complex environment and greatly improve the communication stability of narrowband Internet of Things.

A first transmission power level based on a radio frequency exposure limit and a second transmission power level based on the first transmission power level and a probability of detection of a body by a body proximity sensor are determined, where it is ensured that an average usage of the first and second transmission power levels over time does not exceed the transmission power limit, determined based on radio frequency exposure limits. A transmission power gain is determined based on a difference between the first and second transmission power level based on the probability of detection, and a false alarm rate of the body by the body proximity sensor. The transmission power gain may be used as a performance indicator to select from multiple first and second transmission power gains. First and second transmission power gains corresponding to the selected transmission power gain may be stored and applied during transmission.

The application belongs to the technical field of semiconductor devices, and particularly relates to a high-gain heterojunction amplifier based on an SOI-graphene common-source common-gate circuit and a preparation method thereof. The high-gain heterojunction amplifier comprises a substrate, a buried oxide layer, a top silicon channel region, an oxide layer isolation region, a gate oxide layer, a gate, a gate metal contact, a source metal contact, a drain metal contact on the channel region, and a graphene channel region, a gate oxide layer, a gate, a gate metal contact, a source metal contact and a drain metal contact on the oxide layer isolation region. The application adopts an SOI-graphene heterojunction on the basis of the common-source common-gate circuit, connects the graphene to the gate of the input end of the device, utilizes the high gm of the graphene, connects the high output resistance of the SOI transistor to the output end, so as to improve the output resistance, the voltage and the power gain; the device process cost is lower, and the device can be applied to a radio frequency transistor.

This invention belongs to the field of wireless communication technology and relates to amplifiers in wireless communication systems. Specifically, it provides a gain boost amplifier with Z-type and PreY-type LLRENs, including: a transistor M1, a Z-type LLREN, and an input PreY-type LLREN and / or an output PreY-type LLREN. The input PreY-type LLREN is connected between the input terminal of transistor M1 and the common ground terminal, the output PreY-type LLREN is connected between the output terminal of transistor M1 and the common ground terminal, and the Z-type LLREN is connected between the common ground terminal of transistor M1 and ground. This invention, through its gain boost structure design based on Z-type and PreY-type LLRENs, avoids many problems associated with Y-type LLRENs. That is, this invention effectively maximizes the usable gain G without using the Y-type LLREN. ma Increase to the corresponding upper limit value G ma_upper_limit This means effectively increasing the power gain of the amplifier.

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.

The application discloses a kind of power grid supply-demand balance analysis methods based on large-scale pumping storage output analysis, including obtaining the data information of target power system;Power gain and loss data information of target power system is calculated without considering energy storage and pumping storage output;Pumped storage chargeable electric quantity data information and electric quantity gap data information without considering pumping storage charging and discharging condition are calculated;The scene of pumped storage participation target power system supply-demand balance is analyzed;Supply-demand balance analysis index of target power system is calculated, and the power grid supply-demand balance analysis based on large-scale pumping storage output analysis of target power system is completed.The application also discloses a kind of system for realizing the power grid supply-demand balance analysis based on large-scale pumping storage output analysis method.The application not only realizes the analysis of power grid supply-demand balance, but also has higher reliability and better accuracy.

The present disclosure relates to systems and methods for configuring a transmit power level based on body proximity. A first transmit power level is determined based on a radio frequency exposure limit value, and a second transmit power level is determined based on the first transmit power level and a detection probability of a body by a body proximity sensor, wherein an average usage of the first transmit power level and the second transmit power level over time is ensured not to exceed a transmit power limit value determined based on the radio frequency exposure limit value. A transmit power gain is determined based on a difference between the first transmit power level and the second transmit power level, based on the detection probability of the body by the body proximity sensor and a false alarm rate. The transmit power gain can be used as a performance indicator to select from a plurality of first transmit power gains and second transmit power gains. The first transmit power gain and the second transmit power gain corresponding to the selected transmit power gain can be stored and applied during transmission.

This invention relates to the field of high-power microwave electromagnetic equipment technology, specifically to an X-band passive pulse compression device and gain maintenance method. The invention achieves a compact and space-saving overall structure through the rational arrangement of a spherical energy storage resonant cavity, a dual-polarization mode coupler, a heat dissipation channel, and a tuning aperture. This allows for easy installation and use in small HPM systems, and the resonant cavity's natural frequency is easily adjustable. Furthermore, it proposes a power gain prediction method based on microwave energy storage and release laws, which can accurately obtain the power gain of the pulse compression device at different surface temperatures. Combined with a temperature feedback control system and gain maintenance method, the temperature of the heat-conducting medium within the heat dissipation channel can be rationally adjusted to maintain the stability of the spherical cavity's natural resonant frequency, ensuring that the signal source output frequency is at the point of maximum power gain for pulse compression, thereby maximizing the system's output microwave energy.

This invention discloses a distributed beamforming method, system, and apparatus for low-Earth orbit satellites, comprising: acquiring ground user location information and satellites to be communicated with; calculating the transmission paths between multiple satellites and ground users and obtaining the superimposed signal of electromagnetic waves at the ground end; calculating the superimposed power distribution of the ground electromagnetic waves based on the superimposed signal; constructing an objective function that maximizes the average received power of all ground users and the fairness of ground users based on the calculated superimposed power distribution of the ground electromagnetic waves; calculating the optimal satellite and its corresponding initial transmission phase within the selectable set, indirectly controlling the transmission distance from the satellite to the ground end to control the final phase of the electromagnetic waves received by the receiver, thereby maximizing the overall power gain of multiple ground receiving terminals and the fairness among each individual ground user, providing ideal power gain regardless of the location of the ground user, and simultaneously covering multiple users.

This invention discloses a method, apparatus, product, device, and system for designing the gain of a high-speed ADC front-end link, relating to the field of radio frequency (RF) circuits, for accurately designing the gain of a high-speed ADC front-end link. This invention collects the link parameters of the high-speed ADC front-end link; based on the link parameters and according to the conditions for setting the RF link power gain, it determines the maximum and minimum values ​​of the RF link power gain, thereby determining the range of RF link power gain values. This invention ensures the effectiveness and reliability of the finally designed RF link power gain in the high-speed ADC front-end link.

This application provides a heterojunction transistor and its fabrication method. In the fabrication method, during the wet etching process of laterally etching the first dielectric layer and the second dielectric layer on the sidewall of the first trench, the different etching rates of the first dielectric layer and the second dielectric layer by the wet etching reagent are utilized. The etching rate of the first dielectric layer is greater than that of the second dielectric layer, thereby forming a convex second trench. This increases the contact area between the subsequently formed collector material layer and the substrate, thereby reducing the contact resistance. At the same time, it reduces the contact area between the subsequently formed collector material layer and the base material layer, thereby reducing the collector junction capacitance. This together increases the frequency of the heterojunction transistor, enabling low parasitic parameters and high power gain at high frequencies, meeting the needs of high-frequency communication, sensing, and computing fields.

This invention discloses a transversely periodically loaded flat-top sinusoidal waveguide slow-wave structure, belonging to the field of vacuum electronics technology. The structure includes a sinusoidal waveguide with wide sidewalls configured as sinusoidal periodic undulations; two narrow sidewalls of the waveguide are provided with slot structures periodically arranged along the electromagnetic wave propagation direction; the period of the slot structures is the same as the period of the sinusoidal waveguide, and the center of the first slot structure corresponds to a position half-period of the sinusoidal periodic undulations. Without changing the original electron beam channel dimensions, this invention introduces periodic slot structures on the narrow sidewalls to form a two-dimensional periodic structure, thereby improving the coupling impedance of the slow-wave structure, increasing the effective interaction area, and enhancing the power capacity, thus improving the output power, gain, and interaction efficiency of the traveling wave tube.

A power control method and device of a communication power supply, a computer readable storage medium and the communication power supply, the method comprising: acquiring a multi-dimensional state parameter related to a current communication link; inputting the multi-dimensional state parameter into a pre-trained reinforcement learning model, outputting a discrete power gain adjustment action through the reinforcement learning model; and adjusting the current transmission power according to the power gain adjustment action to obtain and execute a final transmission power; wherein the transmission power comprises radio frequency power of a signal transmitted by the communication power supply. The application realizes adaptive intelligent control of the transmission power of the communication power supply, effectively improves energy efficiency while ensuring communication reliability.

This invention provides a robust weak target detection method and system based on spectral kurtosis weighting, comprising: acquiring raw multi-channel array data and preprocessing it; performing spectral analysis on the preprocessed multi-channel array data to select target sub-bands containing target signals; first, focusing the target azimuth in the spatial domain, then extracting and completing the target sub-bands in the frequency domain, and finally returning to the time domain to form a coherently processable narrowband echo sequence; generating a frequency domain weighted mask based on a multi-shot spectral matrix for the narrowband echo sequence; combining the frequency domain weighted mask with power gain to obtain a comprehensive weighted mask, and using the comprehensive weighted mask to nonlinearly amplify the target spectrum to obtain multi-shot enhanced output data; aligning and accumulating the multi-shot enhanced output data according to different assumed velocities to form a range-velocity history map; performing detection and decision on the history map and outputting target information.