Wireless Links and Propagation
|Flow||T - Electromagnetic Waves and Telecommunication|
|Category||Obligatory (half flow)|
|Class Hours - Lab Hours||3 - 2|
|Lecturers||Christos Capsalis, Panagiotis Cottis, George Fikioris|
Current distribution on linear antennas. Hallen’s and Pocklington’s integral equations. Antenna input impedance. Propagation of electromagnetic waves in presence of Earth. Effect of Earth curvature and ground irregularities. Fresnel theory, Brewster angle. Elevated antennas and optical horizon. Diffraction and scattering of electromagnetic waves, Fresnel zones. Models of electromagnetic wave propagation. Tropospheric waves. Ground-wave propagation. Lumped-circuit equivalent of transmit and receive antennas. Attenuation in LOS and NLOS links. Shadowing. Multipath propagation and coherence bandwidth. Doppler phenomenon and coherence time. Frequency selective channels. Flat fading channels. Slow and fast fading channels. Fading due to atmospheric precipitations. Error performance in fading channels. Fade mitigation techniques. Adaptive coding and modulation. Diversity techniques.