Search for dissertations about: "gaussian channels"

Showing result 1 - 5 of 68 swedish dissertations containing the words gaussian channels.

2. 1. Quantized Feedback for Slow Fading Channels

   Author : Thanh Tùng Kim; Mikael Skoglund; Geir Øien; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fading channels; information rates; feedback communications; diversity methods; MIMO systems; power control; adaptive systems; quantization.; Telecommunication; Telekommunikation;

   Abstract : Two topics in fading channels with a strict delay constraint and a resolution-constrained feedback link are treated in this thesis. First, a multi-layer variable-rate single-antenna communication system with quantized feedback, where the expected rate is chosen as the performance measure, is studied under both short-term and long-term power constraints. READ MORE

4. 2. Analysis of Relay Channels and Improved Iterative Decoders for Turbo-Coded Decode-and-Forward Relay Channels

   Author : Khoa Huynh; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; detect-and-forward; maximum a posteriori; decode-and-forward; Maximum likelihood; iterative decoder.; relay channels; equivalent SNR; upper bound;

   Abstract : Three-node relay channels which consist of a source, a relay and a destinationare considered in this thesis. In the first part, an uncoded relay channelis studied. READ MORE

5. 3. Four-Body Treatment of the Hydrogen-Antihydrogen System

   Author : Henrik Stegeby; Piotr Froelich; Alejandro Saenz; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Antimatter; antihydrogen; four-body system; Adiabatic approximation; Born-Oppenheimer; elastic scattering; stabilization method; resonance states; coupled arrangement channels; coupled rearrangement channels; Gaussian Expansion Method; Antimateria; antiväte; fyrkroppars system; adiabatisk approximation; stabilisationsmetoden; resonanstillstånd; spridningstillstånd; kopplade arrangemangskanaler; Quantum Chemistry; Kvantkemi;

   Abstract : This thesis presents a nonadiabatic (4-body) description of the hydrogen-antihydrogen system at a nonrelativistic level. The properties of the system, the rearrangement processes and the possible existence of resonance states are investigated by using a variational method for coupled arrangement channels, the Gaussian Expansion Method, and the stabilization method. READ MORE

6. 4. Limited Feedback Information in Wireless Communications : Transmission Schemes and Performance Bounds

   Author : Thanh Tùng Kim; Mikael Skoglund; Hesham El Gamal; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Diversity-multiplexing tradeoff; Large deviation analysis; Limited feedback; MIMO channels; Relay channels; Telecommunication; Telekommunikation;

   Abstract : This thesis studies some fundamental aspects of wireless systems with partial channel state information at the transmitter (CSIT), with a special emphasis on the high signal-to-noise ratio (SNR) regime. The first contribution is a study on multi-layer variable-rate communication systems with quantized feedback, where the expected rate is chosen as the performance measure. READ MORE

7. 5. Interference Cancellation for DS/CDMA Systems in Flat Fading Channels

   Author : Ann-Louise Johansson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mixed modulation; direct-sequence code division multiple access DS CDMA ; multiuser detection.; multiple data rates; parallel channels; multicode; interference cancellation;

   Abstract : This thesis investigates interference cancellation in direct-sequence codedivision multiple access (DS/CDMA) systems that support multiple data rates.Two approaches for implementing multiple data rates are considered. Oneis the use of mixed modulation. The second is the use of parallel channels. READ MORE