Sökning: "Jan-Åke Larsson"

Visar resultat 1 - 5 av 11 avhandlingar innehållade orden Jan-Åke Larsson.

1. 1. Spectrum Sensing Algorithms Based on Second-Order Statistics

   Författare :Erik Axell; Erik G. Larsson; Jan-Åke Larsson; Danyo Danev; Visa Koivunen; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Cognitive radio is a new concept of reusing spectrum in an opportunistic manner. Cognitive radio is motivated by recent measurements of spectrum utilization, showing unused resources in frequency, time and space. Introducing cognitive radios in a primary network inevitably creates increased interference to the primary users. LÄS MER

3. 2. Quantum paradoxes, probability theory, and change of ensemble

   Författare :Jan-Åke Larsson; Andrei Khrennikov; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MATHEMATICS; MATEMATIK;

   Sammanfattning : In this thesis, the question "What kind of models can be used to describe microcosmos?" will be discussed. Being difficult and very large in scope, the question has here been restricted to whether or not Local Realistic models can be used to describe Quantum-Mechanical processes, one of a collection of questions often referred to as Quantum Paradoxes. LÄS MER

4. 3. Authentication in Quantum Key Distribution : Security Proof and Universal Hash Functions

   Författare :Aysajan Abidin; Jan-Åke Larsson; Viiveke Fåk; Robert Forchheimer; Joseph Merrill Renes; Linköpings universitet; []
   Nyckelord :;

   Sammanfattning : Quantum Key Distribution (QKD) is a secret key agreement technique that consists of two parts: quantum transmission and measurement on a quantum channel, and classical post-processing on a public communication channel. It enjoys provable unconditional security provided that the public communication channel is immutable. LÄS MER

5. 4. Weaknesses of Authentication in Quantum Cryptography and Strongly Universal Hash Functions

   Författare :Aysajan Abidin; Jan-Åke Larsson; Viiveke Fåk; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MATHEMATICS; MATEMATIK;

   Sammanfattning : Authentication is an indispensable part of Quantum Cryptography, which is an unconditionally secure key distribution technique based on the laws of nature. Without proper authentication, Quantum Cryptography is vulnerable to “man-in-the-middle” attacks. LÄS MER

7. 5. A Few-Mode-Fiber Platform for Quantum Communication Applications

   Författare :Alvaro Alarcón Cuevas; Guilherme B. Xavier; Jan-Åke Larsson; Sebastião Pádua; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Society as we know it today would not have been possible without the explosive and astonishing development of telecommunications systems, and optical fibers have been one of the pillars of these technologies.Despite the enormous amount of data being transmitted over optical networks today, the trend is that the demand for higher bandwidths will also increase. LÄS MER