Search for dissertations about: "telecommunications"

Showing result 16 - 20 of 379 swedish dissertations containing the word telecommunications.

  1. 16. Photonic devices with MQW active material and waveguide gratings : modelling and characterisation

    Author : Nadeem Akram; Lars Thylén; Hartmut Hillmer; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Method of Lines; Grating; ARROW Waveguide; Semiconductor laser; quantum well; Photonics; Fotonik;

    Abstract : The research work presented in this thesis deals with modelling, design and characterisation of passive and active optical waveguide devices. The rst part of the thesis is related to algorithm development and numerical modelling of planar optical waveguides and gratings using the Method of Lines (MoL). READ MORE

  2. 17. Characterisation, Modelling and Digital Pre-Distortion Techniques for RF Transmitters in Wireless Systems

    Author : Mahmoud Alizadeh; Peter Händel; Daniel Rönnow; Noureddine Boulejfen; Högskolan i Gävle; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; RF power amplifiers; non-linearity; memory effects; Behavioral modelling; MIMO; Digital pre-distortion; Intelligent industri; Intelligent Industry;

    Abstract : Wireless systems have become an inevitable part of modern technologies serving humankind. The rapid growth towards large dimensional systems, e.g. READ MORE

  3. 18. Coding and Transmission Strategies for Secrecy

    Author : Mattias Andersson; Mikael Skoglund; Matthieu Bloch; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical Engineering; Elektro- och systemteknik;

    Abstract : In this thesis we consider several problems relating to information theoretic security. The wiretap channel is the simplest information theoretic setting which takes security into account, and in the first chapters of the thesis we design some practical coding schemes for this channel model. READ MORE

  4. 19. Coding for the Wiretap Channel

    Author : Mattias Andersson; Mikael Skoglund; Michael Lentmaier; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telecommunication; Telekommunikation;

    Abstract : We consider code design for Wyner’s wiretap channel. Optimal coding schemes for this channel require an overall code that is capacity achieving for the main channel, partitioned into smaller subcodes, all of which are capacity achieving for the wiretapper’s channel. READ MORE

  5. 20. On error-robust source coding with image coding applications

    Author : Tomas Andersson; Mikael Skoglund; Astrid Lundmark; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; source coding; channel coding; joint source-channel coding; multiple description coding; image coding; vector quantization; channel optimized vector quantization; Telecommunication; Telekommunikation;

    Abstract : This thesis treats the problem of source coding in situations where the encoded data is subject to errors. The typical scenario is a communication system, where source data such as speech or images should be transmitted from one point to another. A problem is that most communication systems introduce some sort of error in the transmission. READ MORE