Sökning: "Ray Urban"

Visar resultat 1 - 5 av 10 uppsatser innehållade orden Ray Urban.

1. 1. Initial access for 5G mmWave private networks

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Mei Li; [2023]
   Nyckelord :Private Network; Initial Access; Millimeter-Wave; Ray Tracing; Cell Search; Random Beamforming; Privat nätverk; Initial Access; Millimeter-Wave; Ray Tracing; Cell Search; Random Beamforming;

   Sammanfattning : This research delves into wireless communication systems, with a particular focus on initial access processes, channel modeling, and beamforming strategies. The study involves meticulous channel data collection across diverse urban, suburban, and rural terrains, each presenting unique propagation challenges. LÄS MER

3. 2. RayTracing Analysis and Simulator Design of Unmanned Aerial Vehicle Communication and Detection System in Urban Environment

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Jie Huang; [2022]
   Nyckelord :Drone detection; phased array; angle of arrival; MUltiple SIgnal Classification; raytracing; reflection; diffraction; Drönardetektering; fasad array; ankomstvinkel; MUltiple SIgnal Classification; raytracing; reflektion; diffraktion;

   Sammanfattning : In recent years, unmanned aerial vehicles (UAV), also called drones, have experienced a rapid increase, which leads to the concern of illegal use of them. Passive RF is one of the effective ways to detect drones by receiving drones’ communication signals. LÄS MER

4. 3. Atmospheric soot particle transformation from urban to rural

   Kandidat-uppsats, Lunds universitet/Kärnfysik; Lunds universitet/Fysiska institutionen

   Författare :Fredrik Johansson; [2018]
   Nyckelord :Aerosol; soot; atmosphere; Physics and Astronomy; Earth and Environmental Sciences;

   Sammanfattning : The main objective of this work was to investigate if there is a contribution of aerosol from the urban region of Copenhagen at the rural station Vavihill. This was done by analyzing measurement data between 1st of January and the 28th of February 2013 measured with a Dierential Mobility Particle Sizer (DMPS), Soot Particle Aerosol Mass Spectrometer (SP-AMS), a Cloud Condensation Nuclei Counter (CCNC) and a NOx-analyzer. LÄS MER

5. 4. Multipath-assisted Single-anchor Outdoor Positioning in Urban Environments

   Master-uppsats, Linköpings universitet/Reglerteknik

   Författare :Erik Ljungzell; [2018]
   Nyckelord :multipath; positioning; single-anchor; ray-tracing; BEZT;

   Sammanfattning : An important aspect of upcoming fifth-generation (5G) cellular communication systems is to improve the accuracy with which user equipments can be positioned. Accurately knowing the position of a user equipment is becoming increasingly important for a wide range of applications, such as automation in industry, drones, and the internet of things. LÄS MER

7. 5. Parallelization of ray casting for solar irradiance calculations in urban environments

   Magister-uppsats, Högskolan i Gävle/Samhällsbyggnad, GIS

   Författare :Patrick Eggers; [2017]
   Nyckelord :Solar Radiation; Parallelization; Simulation; Hardware Architecture; Ray-casting;

   Sammanfattning : The growing amount of photovoltaic systems in urban environments creates peaks of energy generation in local energy grids. These peaks can lead to unwanted instability in the electrical grid. By aligning solar panels differently, spikes could be avoided. LÄS MER