Course Details

ELE 630 Digital Communications I
2021-2022 Spring term information

The course is not open this term

Timing data are obtained using weekly schedule program tables. To make sure whether the course is cancelled or time-shifted for a specific week one should consult the supervisor and/or follow the announcements.

Course definition tables are extracted from the ECTS Course Catalog web site of Hacettepe University ( in real-time and displayed here. Please check the appropriate page on the original site against any technical problems. Course data last updated on 18/05/2022.


Course Name Code Semester Theory
Credit ECTS
DIGITAL COMMUNICATIONS I ELE630 Any Semester/Year 3 0 3 8
Course languageTurkish
Course typeElective 
Mode of DeliveryFace-to-Face 
Learning and teaching strategiesLecture
Question and Answer
Problem Solving
Instructor (s)Department Faculty 
Course objectiveThe aim is to give an in-depth understanding of the topics below to the students; - Receiver design in AWGN, - Digital modulation techniques with coherent and noncoherent detection, - Channel coding; block and convolutional coding , - Spread spectrum transmission; frequency hopping and direct-sequence SS systems and applications.  
Learning outcomes
  1. A student completing the course successfully will L.O.1. understand and solve problems related to digital modulations,
  2. L.O.2. be able to compare relative (dis)advantages of different modulation techniques,
  3. L.O.3. understand and solve problems related to channel coding,
  4. L.O.4. be able to design communication systems combining various modulation and coding techniques
  5. L.O.5. understand and solve problems related to spread spectrum transmission and apply his knowledge in the domains including multiple access (CDMA), ranging, AJ.
Course ContentCoherent and noncoherent demodulation; Maximum likelihood vs MAP decoding.
Synchronization (frequency, phase and time)
Matched filter and correlation receiver,
Digital modulation techniques; M-ASK, M-PSK, M-FSK.
Comparison of modulation techniques; Shannon?s capacity theorem
Channel coding; error detection vs. error correction coding; ARQ systems; block and convolutional coding. Examples: turbo coding and LDPC
Spread spectrum transmission; frequency hopping and direct-sequence SS systems and applications. CDMA, ranging, AJ and LPI.
Referencesřafak, M., Digital Communications, Lecture notes, 2012
Proakis, J., Digital Communications (4th ed.), McGraw Hill, 2000
Haykin, S., Communication Systems (4th ed.), Wiley, 2001
Sklar, B., Digital Communications (2nd ed.), Prentice Hall, 2001

Course outline weekly

Week 1Optimum receiver in AWGN channel; matched-filter and correlation receivers. Optimum detector. Maximum likelihood and MAP detection.
Week 2Antipodal and orthogonal signaling. Symbol error probability of M-ary orthogonal and biorthogonal signaling, simplex and binary-coded signaling
Week 3M-ary PSK, differentially-encoded PSK (DEPSK), Differential PSK (DPSK)
Week 4M-ary PAM, M-ary QAM, Noncoherent M-ary FSK. Comparison of modulation techniques, Shannon?s capacity theorem
Week 5Fundamentals of error control coding. Error detecting vs. correcting codes; random error vs. burst error correcting codes. Hard-decision vs. soft-decision decoding. Hamming vs. Euclidean distance
Week 6Linear block codes. Generator and parity check matrices, syndrome decoding. Examples of commonly used block codes. Cyclic codes; generator and parity polynomials; encoder and syndrome calculator.
Week 7Midterm Exam I
Week 8Examples of cyclic codes: Hamming, BCH, RS, CRC and LDPC codes. ARQ and hybrid ARQ techniques; throughput, delay and packet error probabilities
Week 9Convolutional codes; code tree, state and trellis diagrams. Hard-decision vs. soft-decision decoding. Viterbi algorithm. Interleaving. Turbo codes
Week 10Fundamentals of spread spectrum. Concept of spreading. Pseudo random (PN) codes. Kasami and Gold sequences.
Week 11Direct-sequence spread spectrum, processing gain, AJ, LPI, multipath rejection, ranging. Example: GPS system
Week 12Midterm Exam II
Week 13CDMA. Spreading and multiple-access capabilities of 2G and 3G systems
Week 14Frequency-hopping spread spectrum. Fast vs. slow hopping. Performance evaluation in AWGN channel. AJ performance. Multi-user FH systems.
Week 15Preparation to Final exam
Week 16Final exam

Assesment methods

Course activitiesNumberPercentage
Field activities00
Specific practical training00
Final exam150
Percentage of semester activities contributing grade succes95
Percentage of final exam contributing grade succes150

Workload and ECTS calculation

Activities Number Duration (hour) Total Work Load
Course Duration (x14) 14 3 42
Laboratory 0 0 0
Specific practical training000
Field activities000
Study Hours Out of Class (Preliminary work, reinforcement, ect)14570
Presentation / Seminar Preparation11212
Homework assignment6424
Midterms (Study duration)23060
Final Exam (Study duration) 13030
Total Workload3884238

Matrix Of The Course Learning Outcomes Versus Program Outcomes

D.9. Key Learning OutcomesContrubition level*
1. Has general and detailed knowledge in certain areas of Electrical and Electronics Engineering in addition to the required fundamental knowledge.   X 
2. Solves complex engineering problems which require high level of analysis and synthesis skills using theoretical and experimental knowledge in mathematics, sciences and Electrical and Electronics Engineering.   X 
3. Follows and interprets scientific literature and uses them efficiently for the solution of engineering problems.  X  
4. Designs and runs research projects, analyzes and interprets the results.  X  
5. Designs, plans, and manages high level research projects; leads multidiciplinary projects. X   
6. Produces novel solutions for problems.  X  
7. Can analyze and interpret complex or missing data and use this skill in multidiciplinary projects. X   
8. Follows technological developments, improves him/herself , easily adapts to new conditions.   X  
9. Is aware of ethical, social and environmental impacts of his/her work. X   
10. Can present his/her ideas and works in written and oral form effectively; uses English effectively X   

*1 Lowest, 2 Low, 3 Average, 4 High, 5 Highest

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