Radiowave Propagation 2017/2018

Introduction to Radiowave Propagation. Concept of wireless channel. The electromagnetic spectrum. History, system types.  

Terrain effects: Reflection, Surface wave. The edge and mirror problems, multiple edges. Propagation in urban areas: Wall effects.  

Basic propagation concepts and models. Definition of path loss. Free space loss, plane earth loss, Link budgets.  

Terrestrial fixed links. Path profiles. Tropospheric refraction. Dutcing and multipath. Obstruction  loss.   

Molecular absorption in clear atmosphere: Water vapour and oxigen effects.  

Hydrometeors effects: Definitions of cross sections, Mie and Rayleigh approximations, attenuation due to clouds and fog, attenuation and    crosspolarizatioon due to rain.  

Ionospheric propagation: Theory of ionospheric propagation, ionospheric reflection in terrestrial links, ionospheric effects in space links, the    Faraday effect.  

The noise: Basic definitions, elements of emission theory, emission from sky, atmosphere, land, men made sources.  

Application to satellite fixed links.  

Macrocells. Empirical and physical models. Shadowing, Narrowband fast fading, Wideband fast fading.  

Microcells. Line-of-sight models. Non-line-of-sight models.   

Picocells. Empirical models of propagation within buildings. Propagation in tunnels and other enclosed spaces.   

Megacells. Shadowing and fast fading. Models.  

Overcoming fading by diversity techniques. Space diversity. Polarization diversity

Material:

S.R. Saunders, "Antennas and Propagation for Wireless Communication Systems", John Wiley and sons;

Notes provided by the teacher.