Sökning: "wireless communication system"

Visar resultat 26 - 30 av 433 avhandlingar innehållade orden wireless communication system.

1. 26. Enabling Scalable Security in Internet of Things

   Författare :Zhitao He; Thiemo Voigt; Shahid Raza; Per Gunningberg; Mário Alves; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Internet of Things; Wireless Sensor Networks; Radio Interference; Denial-of-service Attacks; Public Key Infrastructure; Electrical Engineering with Specialisation in Networked Embedded Systems; Elektroteknik med inriktning mot nätverksbaserade inbyggda system;

   Sammanfattning : The popular notion of Internet of Things (IoT) implies two salient features: 1. a diversity of small things, i.e., constrained devices; 2. LÄS MER

3. 27. On the Design of Energy Efficient Wireless Access Networks

   Författare :Sibel Tombaz; Jens Zander; Timothy O'Farrell; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy Efficiency; Wireless Access Networks; Backhaul; Network Deployment; Power Consumption Model; Cell DTX; Cost Analysis; Informations- och kommunikationsteknik; Information and Communication Technology;

   Sammanfattning : Wireless access networks today consume 0.5 percent of the global energy. Rapidly growing demand for new services and ubiqutious connectivity, will further increase the energy consumption. LÄS MER

4. 28. Radio resource management for wireless indoor communication systems : performance and implementation aspects

   Författare :Stefan Pettersson; KTH; []
   Nyckelord :Radio resource management; indoor communication; the bunch concept; centralized RRM; dynamic channel allocation; channel selection;

   Sammanfattning : In this thesis, we investigate several radio resourcemanagement (RRM) techniques and concepts in an indoorenvironment with a dense infrastructure. Future wireless indoorcommunication networks will very likely be implemented atplaces where the user concentration is very high. At these hotspots, the radio resources must be used efficiently. LÄS MER

5. 29. On MIMO Systems and Adaptive Arrays for Wireless Communication : Analysis and Practical Aspects

   Författare :Mattias Wennström; Michael A. Jensen; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Systemteknik; antenna array; calibration; MIMO system; flat fading; non-linear amplifier; switched parasitic antenna; analog beamformer; adaptive antenna testbed; Systemteknik; Systems engineering; Systemteknik; Signal Processing; signalbehandling;

   Sammanfattning : This thesis is concerned with the use of multiple antenna elements in wireless communication over frequency non-selective radio channels. Both measurement results and theoretical analysis are presented. New transmit strategies are derived and compared to existing transmit strategies, such as beamforming and space-time block coding (STBC). LÄS MER

7. 30. Consensus Trade-offs in Wireless Sensor Networks

   Författare :CHRISTOPHER LINDBERG; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Distributed Algorithms; Wireless Sensor Networks; Compressed Sensing; Consensus Algorithms; Trade-off Analysis;

   Sammanfattning : As more and more everyday electronic devices become equipped with the combined re- sources of computation, sensing, and wireless communications, possible platforms for implementation of wireless sensor networks have become ubiquitous. The combination of these three main capabilities of such a network present the opportunity to for example gather high resolution measurement data, or cooperatively perform advanced computa- tional tasks. LÄS MER