Search for dissertations about: "Fourier decomposition"

Showing result 16 - 20 of 29 swedish dissertations containing the words Fourier decomposition.

  2. 16. Synchronization and channel estimation in OFDM systems

    Author : Jaap van de Beek; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Signal Processing;

    Abstract : This thesis addresses synchronization and channel estimation in OFDM communication systems. The joint maximum likliehood estimator of symbol time and carrier frequency offsets for OFDM systems using a cyclic prefix is presented. This estimator exploits the redundancy introduced by the prefix and does not require extra pilot information. READ MORE

  4. 17. Retrieval of equivalent currents by the use of an integral representation and the extinction theorem --- radome applications

    Author : Kristin Persson; Institutionen för elektro- och informationsteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; extinction theorem; inverse source problem; integral representation; radome diagnosis; near-field transformation;

    Abstract : The aim of this thesis is to solve an inverse source problem. The approach is based on an integral representation together with the extinction theorem. Both a scalar and a full-wave integral representation are implemented and solved by a Method of Moment procedure. READ MORE

  5. 18. Feedback Control of Spatially Evolving Flows

    Author : Espen Åkervik; Dan Stefan Henningson; Luca Brandt; Martin Berggren; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Stability; Control; Estimation; Absolute Convective instabilities; Model reduction; Fluid mechanics; Strömningsmekanik;

    Abstract : In this thesis we apply linear feedback control to spatially evolving flows in order to minimize disturbance growth. The dynamics is assumed to be described by the linearized Navier--Stokes equations. Actuators and sensor are designed and a Kalman filtering technique is used to reconstruct the unknown flow state from noisy measurements. READ MORE

  6. 19. The Axisymmetric Turbulent Wake

    Author : Peter Johansson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : This thesis presents a theoretical and experimental study of the turbulent axisymmetric wake. In the theoretical part, an equilibrium similarity solution of the far wake was derived that was found to admit to two different solutions for this flow. READ MORE

  7. 20. Fast methods for electrostatic calculations in molecular dynamics simulations

    Author : Davood Saffar Shamshirgar; Anna-Karin Tornberg; Berk Hess; Robert Krasny; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Tillämpad matematik och beräkningsmatematik; Applied and Computational Mathematics;

    Abstract : This thesis deals with fast and efficient methods for electrostatic calculations with application in molecular dynamics simulations. The electrostatic calculations are often the most expensive part of MD simulations of charged particles. Therefore, fast and efficient algorithms are required to accelerate these calculations. READ MORE