Fundamentals of Communications

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Motivation and presentation of topics in lectures, including small practical examples.
Detailed application exercises, with real application, in lectures and laboratory classes.
A component of practical assessment through the implementation of laboratory work including preparation and report,

The general objective of this course is to provide students with basis theoretical and practical knowledge to enable them to understand and apply the basic concepts associated with communication components and systems:
-To understand the representation of information by analog and digital electrical signals
-To understand the representation of signals in time and frequency
-To know the most relevant characteristics of physical transmission media including their limitations
-To know the basic signal transmission techniques used for baseband and modulation transmission of analog and digital
signals in physical media
– To understand and analyze simple communication systems
-To understand the effects of noise and interference in communication systems
-To understand and implement examples of baseband electrical interfaces
-To know the motivations and principles of networks
-To diagnose faults and use communications equipment and analog and digital interfaces
in industrial environments

1. Information signals
Elements of a communication system
Representation of signals in time
Periodic signals and the sinusoidal signal
Average, power and energy
2. Signals in frequency
Representation of periodic signals as a sum of sinusoidal signals
Applications of the Fourier series and line spectra
Application of the Fourier Transform and continuous spectra
DSB modulation
3. Linear systems
Time versus frequency response
Applications with filter transfer functions
Bandwidth for simple filters
Attenuation, phase shift and linear distortion
4. Physical media and modulation
Symmetrical pairs, coaxial cables and optical fibers
Radio transmission principles and antennas
Power budget without and with thermal noise
Interference by electrical coupling, magnetic coupling and common impedance
Basic principles and applications of DSB modulation, AM, FM, PCM, ASK, FSK, PSK and QAM
5. Basics of interfaces and networks
The RS232, RS485, I2C and USB – features and applications
Netowks basics

NAO

Forouzan, B.A. – Data Communications and Networking, 2nd Edition, 2000.

Carlson, B.A. – Communication Systems: An introduction to Signals and Noise in Electrical Communication, 4th Ed.,2002.

Slides, folhas de exercícios e enunciados de trabalhos laboratoriais.