# SIGNALS AND COMMUNICATIONS:FUNDAMENTALS AND LABORATORY

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Versione italiana
2022/2023
Teacher
VELIO TRALLI
Credits
9
Didactic period
Secondo Semestre
SSD
ING-INF/03

#### Training objectives

The course has the aim of providing the basic concepts on the signals (analog and digital) and the communication systems.
The main knowledge gained by the students will be the following: theory and methods for the analysis of signals and systems in both time and frequency domain, theory and methods for the analysis of random signals, the sampling theory and the discrete-time signals, the modulation theory and the basic concepts of the communications.
At the end of the course the students will be able to describe and analyse continuous-time and discrete-time signals in both time and frequency domains, characterise and evaluate the response of linear systems, e.g. the filters, and non-linear systems, handle random signals and systems with random signals, understand and apply sampling and interpolation of signals, understand the modulation process and the principles to build modulators and demodulators.

#### Prerequisites

Knowledge of the basic concepts of calculus and mathematical analysis, theory of the probability and statistics, theory of electric circuits. More specifically: graphs of basic functions, differentiation and integration techniques, evaluation of probabilities and statistical parameters, analysis of electric circuits in the stationary regime

#### Course programme

Continuous-time, periodic and aperiodic, signals, and Fourier analysis.
Continuous-time systems and characterization of linear time invariant systems. Non linear systems.
Sampling theory. Introduction to discrete-time signals and systems.
Random signals: statistical characterization and spectral properties.
Modulation with sinusoidal carrier. Analysis of modulated signals. Demodulation.
Pulse modulation. Analog-to-digital conversion.
Laboratory: exercises using Matlab.

#### Didactic methods

The course is based on classroom lessons that cover all the topics in the programme. For each topic the presentation of the theory is followed by exercises solved by the teacher. Additional exercises are provided to the students as additional material for their individual study.
The course also includes experimental activities in the laboratory, supervised by the teacher. The aim of this activity is to verify the main results of the theory, by using simple evaluation and simulation programs based on Matlab, and to help the students to develop team working skills.
A set of videos with lessons covering all the topics of the course will be available over Google Classroom for all the students unable to attend in presence, due to Covid-19 pandemic restrictions.

#### Learning assessment procedures

The final examination is suitably organized to check the achievement of the learning objectives in terms of knowledge and abilities as outlined above. The exam is composed of two parts:

A written work with two questions addressing the theoretical part of the program, aimed at verifying the knowledge of the theory, and two exercises aimed at verifying the ability to apply this knowledge to the solution of practical problems. The topics of questions and exercises are selected, for each examination test, among all the topics in the course program. A score in the range between 0 and 30 is assigned to this work. The first part of the exam is passed if the score is greater than or equal to 18.

An oral discussion for the students who have passed the first part of the exam. It is a short talk, which also includes a brief discussion of the activities done in the laboratory, aimed at checking the ability to present and connect in a correct way the topics of the course. The evaluation result of this second part of the exam is used to adjust the score of the first part within a range of 4 units (-2,+2) to obtain the final score of the exam. If requested, English can be used for the oral discussion.

The final exam can be be done over a videoconferencing platform in the case the faculty rooms are closed for the students due to Covid-19 pandemic restrictions. The structure of the exam does not change in this case. A document with instructions and rules for attending will be provided to the students before the exam.

Passing the final exam is the proof that knowledge and abilities outlined in the training objectives of the course have been achieved.

#### Reference texts

1. - L. Calandrino, M. Chiani, Lezioni di comunicazioni elettriche, Pitagora
2. - M. Luise, G. M. Vitetta, Teoria dei segnali, McGraw-Hill
3. - L.W.Couch II, Fondamenti di telecomunicazioni, Pearson-Prentice Hall
4. - S.Haykin, M.Moher, Introduzione alle telecomunicazioni analogiche e digitali, CEA.

The content of the course is almost completely covered by the textbooks 1 and 2. The textbooks 3 and 4, together with 1 and 2, can be used to enlarge the knowledge on specific topics.

Additional exercise material is provided by the teacher for the preparation of the final exam.