Digital Communications (Theory)

Module Information

Module Semester:
Module Part:
Sub-Module Code:
Hours per Week:
Workshop Hours per Week:
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Available to ERASMUS Students:

Module Objective

This course aims to introduce students to the basic concepts of digital systems and digital signal modulation, sending and recovery of the original information signal.

General principles of telecommunication systems. Fourier transform and phasors, Basic elements of information theory and code theory- Basic codes. Data compression. Sampling, encoding and data transmission. Characteristics of wired and wireless transportation of data, bandwidth and channel capacity. Transmission networks,(i.e. coaxial, optical fibers etc). Types of signals, time/frequency representation. Satellite communications. Wireless communications, GSM, DCS, GPRS, UMTS, DECT, TETRA. Methods of A/D and D/A conversion (PAM, PPM, PWM, PCM, and δ). Analogue modulation of analogue signals (AM, FM, PM) and digital signals (ASK, FSK, PSK, QAM, TCM, DMT). Dial-up and xDSL modems. Digital transmission of digital signals (NRZ, RZ, Biphase). Signal multiplexing techniques (FDM, TDM, CDM). Multiple access methods. PDH and SDH transmission systems.

EMF and health- Field measurements.

Module Study Targets

Upon completion of the course the student should be able to:

  • Outline the basic components of a typical telecommunications system
  • Describe the main digital and analogue modulation techniques within 600 words each
  • Distinguish the signal from the carrier
  • Propose suitable transmission medium for the main modulation techniques
  • Calculates the transmission sizes
  • Collaborated with co-students in presentations of the modulation techniques

Module Acquired Abilities

  • Independent Work
  • Teamwork
  • Analysis and synthesis of data
  • Enhance critical thinking

Module Description

The course is an introduction to the concepts of the systems of telecommunications and to the techniques employed for the modulation and the transmission of the telecommunication- signals.

The mathematical formalism of the information theory is the basis for the deep understanding of the modulation theory.

The basic knowledge of the Fourier transform and the phasors are crucial to facilitate the students in understanding and solving problems in Digital Communications.

Wired and wireless communication through their respective configurations and transmission media are among the main issues of the course.

Module Student Evaluation

Final written exam (60%) comprising:

  • Solving basic telecommunications issues,
  • Theoretical understanding answers by Fourier signal analysis,
  • Theoretical understanding of Sample answers,
  • Theoretical understanding responses of analogue and digital modulations

Laboratory Practice (40%)


  • Taub & Schilling, "Principles of Communication Systems", McGraw Hill, 2/e, 2009
  • Bernard Sklar, "Digital Communications: Fundamentals and Applications", Pearson Education, 2/e, 2001
  • Andy Bateman, Addison Wesley, "Digital Communications: Design for the Real World", Prentice Hall, 1998
  • M. Shanmugam, "Digital and Analog Communication Systems", John Wiley & Sons, 1979
  • IEEE Communications Magazine