Digital Communications

Subject description

Analog transmission basics: signal spectrum, signal distortion and noise.  Wired telephone channel, mobile wireless channel. Amplitude, phase and frequency modulation.  RF spectrum allocation and mixing. Waveform coding:  signal sampling and quantization.

Baseband data transmission with pulse amplitude modulation. Intersymbol interference and receiver equalization.

Channel coding, error detection and error correction.  Block codes and convolutional codes.

Binary and multi-level digital passband modulation techniques: amplitude, phase, frequency and combined shift-keying. Multicarrier modulation techniques.

Multiple access to a common medium with resource division. Multiple access techniques in various signal domains: spatial, frequency, time and code. Channel allocation methods: static, random and on-demand.

Multiple antenna transmission systems (MIMO).

Digital audio and video broadcasting techniques (DAB and DVB). Wired and wireless access-network techniques overview: DSL, from GSM to 5G.

The subject is taught in programs

Objectives and competences

Learning about basic principles of signal transmission including how to deal with the various problems on wired and wireless channel.

Knowledge of the transmission media limitations and adequate communication signal processing methods to use the available physical-media transmission capacity.

Teaching and learning methods

Lectures and practical laboratory work.

Expected study results

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

  • describe the basic building blocks in the link chain of the physical communication layer,
  • explain digital modulation techniques and coding techniques,
  • compare common media multiple access techniques,
  • plan the transmission capacities of communication links,
  • clarify the functioning of transmission systems in practice.

Basic sources and literature

  1. Sašo Tomažič, Digitalne komunikacije, Založba FE, 2014.
  2. Anton Umek, Digitalne komunikacije: študijsko gradivo in navodila za laboratorijske vaje. Ljubljana, 2012,
  3. Andy Bateman, Digital Communications: Design for the Real Word, Addison Wesley, 1999.
  4. Bernard Sklar, Digital Communications: Fundamentals and Applications, Prentice Hall, 2001.

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

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