Digital Communications

Course Description

Explain the importance of digital communications. Provide basic knowledge about information and their baseband and passband transmission. Explain the concept of analog modulation techniques. Provide introduction to discrete modulations. Explain the functionality and characteristics of OFDM. Provide an overview of Spread Spectrum Systems.

Learning Outcomes

  1. Explain the idea of digital communications
  2. Estimate digital signal characteristic in baseband and passband transmission
  3. Compare analog modulations
  4. Analyze possibilities and limitations of different analog modulations
  5. Compare discrete modulations
  6. Analyze possibilities and limitations of different discrete modulations
  7. Explain the idea and applications of OFDM
  8. Explain the idea and applications of Spread Spectrum Systems

Forms of Teaching


Lectures are conducted with the help of power-point presentations with explanations on the board. Lectures are available online in electronic form.


Solving numerical examples.

Independent assignments

During the semester, projects from the course area are planned. More complex tasks would be solved, most often with the use of software tools. Each project would be handled by smaller group of students.


Laboratory exercises are planned during the course. At the end of each exercise, the activity and understanding would be check.

Grading Method

Continuous Assessment Exam
Type Threshold Percent of Grade Threshold Percent of Grade
Laboratory Exercises 0 % 10 % 0 % 0 %
Seminar/Project 0 % 10 % 0 % 0 %
Mid Term Exam: Written 0 % 30 % 0 %
Final Exam: Written 0 % 30 %
Final Exam: Oral 20 %
Exam: Written 0 % 60 %
Exam: Oral 40 %

Week by Week Schedule

  1. Digital communication system model, relation between baseband and passband communication
  2. Baseband communication model, shaping of signals. Optimal receiver. Nyquist's criterions. Effect of nonlinearity
  3. Transmission impairments. Line coding
  4. Differential coding. Modulation concept
  5. Amplitude modulation, frequency modulation
  6. Phase modulation, typical modulator circuits, typical demodulator circuits
  7. Amplitude-Shift Keying, Frequency-Shift Keying
  8. Midterm exam
  9. Phase-Shift Keying, Quadrature Amplitude Modulation (QAM), Minimum-Shift-Keying (MSK), GMSK
  10. Demodulation and probability of bit error rate, Gram Schmidt orthogonalization, comparison of modulation techniques. The quality of modulation
  11. OFDM - purpose and method of realization, channel equalization in OFDM systems, Peak to average power ratio problem. Interference analysis between subcarriers
  12. Adaptive modulation and capacity, Waterfilling algorithm, Multiple access method - OFDMA
  13. Direct Sequence Spread Spectrum (DSSS), Frequency Hopping Spread Spectrum (FHSS), Synchronization in spread spectrum systems; Power control
  14. Code properties; Code selection; Code generation, Example of use in the UMTS system
  15. Final exam

Study Programmes

University graduate
Audio Technologies and Electroacoustics (profile)
Elective Courses of the Profile (1. semester)
Communication and Space Technologies (profile)
(1. semester)
Computational Modelling in Engineering (profile)
Free Elective Courses (1. semester)
Computer Engineering (profile)
Free Elective Courses (1. semester)
Computer Science (profile)
Free Elective Courses (1. semester)
Control Systems and Robotics (profile)
Free Elective Courses (1. semester)
Data Science (profile)
Free Elective Courses (1. semester)
Electrical Power Engineering (profile)
Free Elective Courses (1. semester)
Electric Machines, Drives and Automation (profile)
Free Elective Courses (1. semester)
Electronic and Computer Engineering (profile)
Free Elective Courses (1. semester)
Electronics (profile)
Free Elective Courses (1. semester)
Information and Communication Engineering (profile)
Elective Courses of the Profile (1. semester)
Network Science (profile)
Free Elective Courses (1. semester)
Software Engineering and Information Systems (profile)
Free Elective Courses (1. semester)


B. Rimoldi (2016.), Principles of Digital Communication: A Top-Down Approach,, Cambridge University Press
Haykin, Simon (2001.), Communication Systems, John Wiley and Sons
Borivoj Modlic, Ivan Modlic (1995.), Modulacije i modulatori, Školska knjiga
J.G. Proakis; M. Salehi (2018.), Digital Communications, MC GRAW HILL INDIA; 5th edition
Simon Haykin (2013.), Digital Communication Systems, Wiley


Laboratory exercises

For students


ID 222530
  Winter semester
L3 English Level
L1 e-Learning
45 Lectures
15 Exercises
12 Laboratory exercises

Grading System

Very Good