Sökning: "TECHNOLOGY Information technology Telecommunication"

Visar resultat 21 - 25 av 222 avhandlingar innehållade orden TECHNOLOGY Information technology Telecommunication.

1. 21. Constellation Design under Channel Uncertainty

   Författare :Jochen Giese; Mikael Skoglund; Bertrand Hochwald; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Constellation design; diversity; fading channels; frequency-selective channels; joint channel estimation and data detection; multiple antennas; partial channel state information; wireless communication; Telecommunication; Telekommunikation;

   Sammanfattning : The topic of this thesis is signaling design for data transmission through wireless channels between a transmitter and a receiver that can both be equipped with one or more antennas. In particular, the focus is on channels where the propagation coefficients between each transmitter--receiver antenna pair are only partially known or completetly unknown to the receiver and unknown to the transmitter. LÄS MER

3. 22. Communication and Networking Techniques for Traffic Safety Systems

   Författare :Ioan Chisalita; Nahid Shahmehri; Shie-Yuan Wang; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vehicular communication; networkking; safety-data; Telecommunication; Telekommunikation;

   Sammanfattning : Accident statistics indicate that every year a significant number of casualties and extensive property losses occur due to traffic accidents. Consequently, efforts are directed towards developing passive and active safety systems that help reduce the severity of crashes, or prevent vehicles from colliding with one another. LÄS MER

4. 23. Distribution and Individual Watermarking of Streamed Content for Copy Protection

   Författare :Karl-Göran Stenborg; Robert Forchheimer; Peter Parnes; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Watermarking; Fingerprinting; Video distribution; Broadcast; Multicast; Telecommunication; Telekommunikation;

   Sammanfattning : Media such as movies and images are nowadays produced and distributed digitally. It is usually simple to make copies of digital content. Consequently illegal pirate copies can be duplicated and distributed in large quantities. One way to deter authorized content receivers from illegally redistributing the media is watermarking. LÄS MER

5. 24. Available-Bandwidth Estimation in Packet-Switched Communication Networks

   Författare :Erik Bergfeldt; Johan M Karlsson; Terje Jensen; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telecommunication; Telekommunikation;

   Sammanfattning : This thesis presents novel methods that are able to perform real-time estimation of the available bandwidth of a network path. In networks such as the Internet, knowledge of bandwidth characteristics is of great significance in, e.g., network monitoring, admission control, and audio/video streaming. LÄS MER

7. 25. Radio Network Planning and Resource Optimization : Mathematical Models and Algorithms for UMTS, WLANs, and Ad Hoc Networks

   Författare :Iana Siomina; Di Yuan; Peter Värbrand; Arie Koster; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; planning; optimization; wireless networks; radio resources; UMTS; WLAN; ad hoc; Telecommunication; Telekommunikation;

   Sammanfattning : The tremendous popularity of wireless technologies during the last decade has created a considerable expansion of wireless networks both in size and use. This fact, together with a great variety of mobile devices and numerous di®erent services that are becoming increasingly resourcedemanding, have attracted the attention of many researchers into the area of radio resource planning and optimization. LÄS MER