Ing Ind - Inf (Mag.)(ord. 270) - MI (474) TELECOMMUNICATION ENGINEERING - INGEGNERIA DELLE TELECOMUNICAZIONI
093287 - WIRELESS AND MOBILE PROPAGATION
This course addresses the fundamentals of radiowave propagation, with particular emphasis on wireless and mobile systems. An engineering approach is adopted: excessive formalism is avoided while theoretical instruments are given, so that the student can address real problems starting from a solid background.
Risultati di apprendimento attesi
DoD 1: Knowledge and understanding
Students will learn:
- the fundamental physical principles of electromagnetic wave propagation
- the fundamental properties and parameters of antennas (as transducers)
- the effects of the interaction of electromagnetic waves with the environment in a nomadic/mobile scenario
DoD 2: Applying knowledge and understanding
Students will be able to:
- identify the most relevant propagation modes for a given scenario
- select and apply the correct empirical/statistical and physical/deterministic prediction models
- predict system performance
DoD 3: Making judgements
Students will be able to:
- identify the most important design parameters of the air-segment of a wireless communication system
- choose and apply the most effective methods to counteract propagation impairments
Electromagnetic waves (frequency, wavelength, polarization). Nature of the waves: direct wave, reflected wave, diffracted wave, scattered wave. Multipath radio channel; mean delay and delay spread.
Antennas as transducers. Antenna parameters: directivity, gain, directivity function, effective area, effective length, impedance. Equivalent circuit. Link budget in free space (Friis equation). EIRP.
Time dispersion; wideband and narrowband channel; LOS (Rice distribution) and NLOS (Rayleigh distribution); space correlation. Fading countermeasures (multiple antennas, frequency hopping, etc.). Applications: civic WiFi networks, digital broadcasting, etc.
Frequency dispersion; Doppler effect and Doppler shift; correlation in time and frequency; fading countermeasures. Applications: mobile cellular networks, inter-vehicular networks, etc.
Reverberating environment; penetration through walls, floor and ceiling made of common indoor materials (marble, glass, concrete, wood, etc.); dependence on frequency; fading countermeasures. Applications: WiFi, domotics, UWB systems, sensor networks, etc.
Models and methods.
Optical geometry; empirical propagation models; deterministic models (ray tracing and launching, etc.); radio coverage prediction; numerical tools (examples).
Students are required to have a good knowledge of complex numbers, phasors and vector fields. Basic knowledge of electromagnetic theory can help in the learning process.
Modalità di valutazione
The assessment will be based on a written exam at the end of the course. The written exam consists of three numerical exercises that must be solved in two hours. Copies of past exams texts can be found on BeeP.
The objective of the exam is to assess the student's ability to:
- identify the most relevant propagation mode(s) for the given scenario
- quantitatively describe the interaction of electromagnetic rays with the environment
- quantitatively evaluate the effects of the interaction of direct, reflected and/or diffracted electromagnetic rays
- quantitatively assess the impact of countermeasures on system's performance
The written exam is "open book", i.e. during the exam the student can freely consult textbooks, notes, etc.
J. D. Parsons, The Mobile Radio Propagation Channel (2nd Edition), Editore: Wiley, Anno edizione: 2000
C.A. Levis, J.T. Johnson, F.L. Teixeira, Radiowave Propagation, Editore: Wiley, Anno edizione: 2010
A. Paraboni, M. D'Amico, Radiopropagazione, Editore: McGraw-Hill, Anno edizione: 2002 Note:
In italiano - in Italian
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Tipo Forma Didattica
Ore di attività svolte in aula
Ore di studio autonome
Laboratorio Di Progetto
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Insegnamento erogato in lingua
Disponibilità di materiale didattico/slides in lingua inglese
Disponibilità di libri di testo/bibliografia in lingua inglese
Possibilità di sostenere l'esame in lingua inglese