Communication Systems

Subject description

Fundamentals of communication: information, communication channel. Redundancy and irrelevance of information signals.

Random signals and noise: probability, random variable, probability density function; stochastic process, autocorrelation, power density spectrum.

Properties of common information signals: sound signals, video, data.

Digital transmission of analogue signals: sampling, quantization, coding; reconstruction, origins of signal degradation.

Physical transmission media: wireless medium, optical fibre, transmission line. Fundamentals of lossy transmission lines: attenuation, dispersion. Wave phenomena on short lines.

Wired transmission of analogue signals: equalization, noise accumulation.

Baseband pulse signaling: line codes, intersymbol interference, bit error rate.

Bandpass signaling: continuous wave modulations. Linear and angle modulation schemes, principles of modulation and demodulation, superheterodyne receiver.

Digital signal modulations: OOK, FSK, PSK, QAM.

The subject is taught in programs

Objectives and competences

Basics of information signal transmission for electronic engineers. Proper selection of communication requirements based on theoretical concepts and existing solutions. 

Teaching and learning methods

Lectures, tutorial, homework

Expected study results

After successful completion of the course students should be able to:

– describe the elements of a basic telecommunication system model,

– explain the common property of information signals and list their basic types,

– identify communications that require transmission in real-time,

– use logarithmic units in calculations of signal quality, transmission loss, sound pressure level,

– list transmission media used in communication channels and name their main features,

– calculate the required bit rate for digital transmission of analog signals in real-time.

Basic sources and literature

S. Tomažič, Osnove telekomunikacij I, Založba FE in FRI, Ljubljana 2002

 S. Haykin, Communication systems, 4th edition, John Wiley, New York 2001

 L. W. Couch, Digital and analog communication systems, Prentice-Hall, New Jersey 2001

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University of Ljubljana, Faculty of Electrical Engineering Tržaška cesta 25, 1000 Ljubljana

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