Sökning: "large signal"

Visar resultat 1 - 5 av 979 avhandlingar innehållade orden large signal.

1. 1. Signal Separation - II

   Författare :Ulf Lindgren; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; local convergence; mutual information; chi square test; signal enhancement; parameter identifiability; source separation; signal separation; algorithms;

   Sammanfattning : Signal separation is a signal processing technique which enables the separation of superimposed signals. There are several practical situations were signal separation can be used, for example in noise reduction for cellular phones subject to background noise. LÄS MER

3. 2. Large-Signal Modeling of Microwave Transistors

   Författare :Lars Bengtsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; large-signal; HEMT; non-linear models; de-embedding; high-efficiency; class-E amplifier; LDMOS; HBT; HFET; model parameter extraction; microwave transistors;

   Sammanfattning : The development of computer aided design tools for microwave circuit design has increased the interest for accurate transistor models. The circuit complexity has grown as the CAD tools have been improved and the need to predict how non-linear circuits behave has also been increased. LÄS MER

4. 3. Tailoring Gaussian processes and large-scale optimisation

   Författare :Carl Jidling; Thomas B. Schön; Niklas Wahlström; Adrian Wills; Lars Kai Hansen; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Gaussian processes; Tomographic reconstruction; Large-scale optimisation; Electrical Engineering with specialization in Signal Processing; Elektroteknik med inriktning mot signalbehandling;

   Sammanfattning : This thesis is centred around Gaussian processes and large-scale optimisation, where the main contributions are presented in the included papers.Provided access to linear constraints (e.g. equilibrium conditions), we propose a constructive procedure to design the covariance function in a Gaussian process. LÄS MER

5. 4. Accelerating Convergence of Large-scale Optimization Algorithms

   Författare :Euhanna Ghadimi; Mikael Johansson; Angelia Nedich; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Convex optimization; Large-scale systems; First-order methods; Convergence analysis; ADMM; Optimization algorithms; Electrical Engineering; Elektro- och systemteknik; Matematik; Mathematics;

   Sammanfattning : Several recent engineering applications in multi-agent systems, communication networks, and machine learning deal with decision problems that can be formulated as optimization problems. For many of these problems, new constraints limit the usefulness of traditional optimization algorithms. LÄS MER

7. 5. Nonlinear Characterization of Wideband Microwave Devices and Dispersive Effects in GaN HEMTs

   Författare :Sebastian Gustafsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; large-signal; dispersive effects; electron trapping; thermal coupling; HEMT; GaN; microwave; wideband;

   Sammanfattning : Measurements play a key role in the development of microwave hardware as they allow engineers to test and verify the RF performance on a system, circuit, and component level. Since modern cellular standards employ complex modulation formats with wider signal bandwidths to cope with the growing demand of higher datarates, nonlinear characterization using wideband stimuli is becoming increasingly important. LÄS MER