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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Anslutning av en PDA till en monitor

Andersson, Arvid January 2004 (has links)
No description available.
2

Blue tooth : test of devices range

Weninger, Malin January 2003 (has links)
No description available.
3

Anslutning av en PDA till en monitor

Andersson, Arvid January 2004 (has links)
No description available.
4

Blue tooth : test of devices range

Weninger, Malin January 2003 (has links)
No description available.
5

Trådlöst nätverk : en attitydstudie

Nilsson, Daniel, Krafft, Mikael January 2004 (has links)
No description available.
6

Trådlöst nätverk : en attitydstudie

Nilsson, Daniel, Krafft, Mikael January 2004 (has links)
No description available.
7

Simulering av trådlös kommunikation : Visualisering av effektdämpning för radiosignaler / Simulation of wireless communication : Visualization of power attenuation in radio signals

Larsson, Jonathan, Wretfors, Adam January 2024 (has links)
5G is the latest standard for mobile networks. The technology enables higher speedsthrough the use of higher frequencies. These higher frequencies mean shorter range forsignals. Consequently, the placement of connection points becomes increasingly crucialto achieve optimal performance. By simulating how connection points should be placedinstead of having a person manually test different placements, both time and money canbe saved. The client already has a simulator in place that supports visualizing whethera receiver is reached by a radio beam or not. The simulator consists of two parts, whereone simulates the behavior of radio beams using ray tracing, and the other displays theresults of the simulation. The goal of this work is to extend the existing simulator withfeatures to simulate and visualize signal attenuation in radio beams. The simulationtakes place in a ray tracing engine that utilizes the OptiX ray tracing API. Unity isused for visualization to graphically depict how the power of radio beams changes. Toachieve this goal, enhancements to the existing simulator were made, and investigationsinto ray tracing, signal attenuation, and electromagnetic properties were conducted. Theresult of the work is an extension of the simulator with the capability to visualize thedecreasing power of radio beams using different colors. Additionally, the user interfacewas expanded with features to make the simulator easier to use.
8

Styrning av datorers strömlägen med enhetsigenkänning via trådlösa nätverk : Controlling computer power modes using device recognition via wireless networks

Klintström, Angelica, Badini, André January 2015 (has links)
Rapportens syfte är att påvisa möjligheten att sänka energiförbrukningen på arbetsplatser. I samband med detta arbete utvecklas en hårdvarulösning, som kallas AutoSleep, vars syfte är att automatisera arbetsdatorns byte mellan strömspar- och aktivt läge.AutoSleep utför sin uppgift genom att söka efter en specifik förutbestämd enhet bland de enheter som för stunden är uppkopplade mot arbetsplatsens nätverk. Beroende på om enheten hittas eller ej skickar AutoSleep en signal till datorn som därefter antingen försätter datorn i strömsparläge eller i aktivt läge. För att undersöka nyttan och nödvändigheten hos arbetet utfördes en kvalitativ litteraturstudie, sammanställning av statistik från två enkäter, en intervju och en experimentell studie. All insamlad teori och statistik jämfördes med tidigare studier för att avgöra rapportens tillförlitlighet. Resultatet visade att det finns ett stort utrymme för förbättring inom energieffektiviseringen vid användandet av arbetsdatorer. Det system som utvecklades i samband med arbetet kan på ett enkelt sätt bidra till en energismartare arbetsmiljö. Arbetet visar på en möjlig lösning och använder ett hårdvarugränssnitt som endast är tillgängligt på stationära datorer. Hårdvarulösningen använder en smartphone som verktyg för enhetsigenkänning och växlar endast datorns strömläge mellan strömspar- och aktivt läge.
9

Hydroakustisk kommunikation med bandspridningsteknik / Hydroacoustic communication with spread spectrum

Andersson, Magnus, Severinson, Kristofer January 2004 (has links)
<p>This thesis investigates techniques for stealth hydroacoustic communication using spread spectrum. The Swedish naval defense organisations have a vision that all their units should be able to communicate with each other, even between underwater vehicles. But the properties of water makes it a complex channel to use for wireless communications. Radiomagnetic waves have very limited range in water, therefore acoustic waves are used. </p><p>In this report the basics of wireless communication systems are described including source coding, channel coding, modulation techniques as well as different techniques for spread spectrum. The fundamental principle for all spread spectrum systems is to use more bandwidth than necessary to spread the signal energy in the frequency spectrum. This limits the data rate but results in a robust communication link which is difficult to detect, intercept and to jam. </p><p>In addition to the theoretical background, this thesis also gives a brief description of a Matlab system and a VHDL-system that was developed during the project. Finally the results of this project are presented and some suggestions of further developments are given.</p>
10

Hydroakustisk kommunikation med bandspridningsteknik / Hydroacoustic communication with spread spectrum

Andersson, Magnus, Severinson, Kristofer January 2004 (has links)
This thesis investigates techniques for stealth hydroacoustic communication using spread spectrum. The Swedish naval defense organisations have a vision that all their units should be able to communicate with each other, even between underwater vehicles. But the properties of water makes it a complex channel to use for wireless communications. Radiomagnetic waves have very limited range in water, therefore acoustic waves are used. In this report the basics of wireless communication systems are described including source coding, channel coding, modulation techniques as well as different techniques for spread spectrum. The fundamental principle for all spread spectrum systems is to use more bandwidth than necessary to spread the signal energy in the frequency spectrum. This limits the data rate but results in a robust communication link which is difficult to detect, intercept and to jam. In addition to the theoretical background, this thesis also gives a brief description of a Matlab system and a VHDL-system that was developed during the project. Finally the results of this project are presented and some suggestions of further developments are given.

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