Search for dissertations about: "Bit rates"

Showing result 1 - 5 of 110 swedish dissertations containing the words Bit rates.

2. 1. On Bit-Wise Decoders for Coded Modulation

   Author : Mikhail Ivanov; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; bit-error probability; L-values; labeling; Gray code; coded modulation; log-likelihood ratio; maximum likelihood decoder; Additive white Gaussian noise; quadrature amplitude modulation.; interleaver; flat fading channel; pairwise error probability;

   Abstract : Coded modulation is a technique that emerged as a response to the growing demand for high data rates. It was devised to achieve high spectral efficiency with high reliability, potentially approaching Shannon’s capacity. The main idea of coded modulation consists in combining error-correcting coding with higher-order modulation. READ MORE

4. 2. Generation and Transmission of Optical Solitons at Ultrahigh Bit Rates

   Author : Bamdad Bakhshi; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nonlinear optics; chirp-free optical pulses; lowpass filtering; polarization-maintaining fibers; optical communication; optical solitons; Erbium fiber ring laser; dispersion-management; active mode-locking; soliton interactions; erbium-doped fiber amplifier; Gaussian pulses;

   Abstract : This thesis deals with the generation and transmission of optical solitons in ultrahigh-speed fiber-optic communication systems. For optical soliton pulses the fiber dispersion and nonlinearity can under certain circumstances cancel each other, thus allowing the solitons to remain undistorted over long distances. READ MORE

5. 3. Evaluating and Improving Rendered Visual Experiences : Metrics, Compression, Higher Frame Rates & Recoloring

   Author : Pontus Ebelin; Matematik LTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Computer Graphics; Image Quality Assessment; Perception; Edge Detection; Low Dynamic Range Imagery; High Dynamic Range Imagery; High Frame Rates; Texture Compression; Color Vision Deficiency; Recoloring; Computer Graphics; Image Quality Assessment; Perception; Edge Detection; Low Dynamic Range Imagery; High Dynamic Range Imagery; High Frame Rates; Texture Compression; Color Vision Deficiency; Recoloring;

   Abstract : Rendered imagery is presented to us daily. Special effects in movies, video games, scientific visualizations, and marketing catalogs all often rely on images generated through computer graphics. However, with all the possibilities that rendering offers come also a plethora of challenges. READ MORE

6. 4. Bit loading and precoding for MIMO communication systems

   Author : Svante Bergman; Björn Marklund; Tim Davidsson; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telecommunication; Telekommunikation;

   Abstract : This thesis considers the joint design of bit loading, precoding and receive filters for a multiple-input multiple-output (MIMO) digital communication system. Both the transmitter and the receiver are assumed to know the channel matrix perfectly. It is well known that, for linear MIMO transceivers, orthogonal transmission (i.e. READ MORE

7. 5. Topics in Simulation and Stochastic Analysis

   Author : Mikael Signahl; Matematisk statistik; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mathematics; Matematik; stochastic heat equation; stochastic wave equation; error rates; truncated Levy process; discontinuities; optimal decay rate; digital communication system;

   Abstract : Paper A investigates how to simulate a differentiated mean in cases where interchanging differentiation and expectation is not allowed. Three approaches are available, finite differences (FD's), infinitesimal perturbation analysis (IPA) and the likelihood ratio score function (LRSF) method. READ MORE