7 results about "Linearization" patented technology

The invention relates to a method and circuit for linearizing amplifiers and other nonlinear circuits for multi-carrier signals. An output signal from the amplifier is sampled, and a correlation matrix of size N×N is computed from the sampled signal, wherein N exceeds the number of multiplexed carriers in the signal. A signal-to-distortion ratio (SDR) is then estimated based on a ratio of one or more largest to one or more smallest eigenvalues of the correlation matrix, and the signal into the amplifier is pre-distorted so as to maximize the SDR.

The embodiment of the invention discloses an outdoor unit and a method thereof for improving output performance. The method comprises the following steps that: the outdoor unit (ODU) receives a first analog signal sent by an indoor unit (IDU) and converts the received first analog signal into a first digital baseband signal through down-conversion; and the ODU receives a second analog signal output by a power amplifier (PA) and converts the received second analog signal into a second digital baseband signal through the down-conversion; the ODU obtains a digital predistortion coefficient according to the first and second digital baseband signals; and the ODU performs digital predistortion processing on the first digital baseband signal by adopting the digital predistortion coefficient to acquire a signal after the digital predistortion processing and sends the signal to the power amplifier. The outdoor unit and the method thereof for improving the output performance can realize the linearization of a sender link without requiring the PA to work in a linear mode.

The invention discloses a power flow obtaining method applicable to an AC and DC system. The power flow obtaining method comprises the steps of: firstly, establishing an AC and DC power system power flow model including an AC network model, a DC network model and a converter model, then, relaxing the AC and DC power system power flow model to a second-order cone form by adopting a cone relaxationtechnology, and finally, on this basis, obtaining a piecewise linearization AC and DC power system power flow model according to a second-order cone linearization method, wherein the linearization precision can be adjusted through a zooming method and changing of a piecewise number index. According to the power flow obtaining method applicable to the AC and DC system disclosed by the invention, the cone relaxation technology and the second-order cone linearization technology are adopted; the original non-convex nonlinear AC and DC power flow equation is converted into the convex piecewise linearization form; the operation economy of the whole AC and DC system can be improved; and simultaneously, the power flow obtaining method is also more suitable for processing all kinds of operation optimization problems having relatively high timeliness requirements in the power system.

The invention discloses a standby decision-making method for fully considering the reliability and the economical efficiency of an electric system. The method comprises the steps that a most basic unit commitment is operated, and a capacity loss probability table (COPT) is set up based on the unit commitment result; the EENS is expressed as a piecewise linearization expression of an SSR based on the capacity loss probability table (COPT); a spinning reserving optimization model carrying an EENS analytical expression is operated, and a capacity loss probability table (COPT) is set up again through the operation result; whether convergence conditions are met or not is judged, if convergence is achieved, operation quits, otherwise, the step of expressing the EENS as the piecewise linearization expression of the SSR based on the COPT is executed again till the convergence conditions are met. The EENS is analyzed into a piecewise linear function only relevant to the SSR, the complexity of the EENS is greatly reduced, and the EENS can be solved easily. Spinning reservation can be automatically optimized between the reliability and the economical efficiency, and calculating efficiency is effectively improved.

The invention belongs to the technical field of data analysis, and discloses a computer system for economic management data analysis. The computer system comprises an input module, a genetic algorithmmodule, an output module, a linearization transformation module, a calling module, an economic management database and a modeling prediction module, wherein the input module is connected with the genetic algorithm module and the linearization transformation module; the genetic algorithm module is connected with the output module; the linearization transformation module is connected with the calling module and the modeling prediction module; the calling module is connected with the economic management database. The invention provides a systematic and logical analysis method, by which several factors such as demand, production, cost and market are comprehensively considered and an optimal solution of a multivariate problem is calculated according to a genetic algorithm; logratio transformation and modeling can be also performed according to data in the database, to predict economic management data.

A 5G millimeter wave power amplifier linearization simulation method is disclosed, which exhibits universality. When a digital predistortion algorithm adopted by engineers or researchers is not suitable for the power amplifier model or some parameters in the digital predistortion algorithm are unreasonable, the simulation results of power amplifier circuit in ADS will directly and concretely get the result that the linearity is not improved or even deteriorated. By using ADS and MATLAB, the invention helps engineers to check the capability of the designed power splitting amplifier and the corresponding digital predistortion algorithm, and helps them to optimize the digital predistortion algorithm.