Principles of Digital Communications

By Prof. Abhishek Dixit   |   IIT Delhi
Learners enrolled: 1525
Digital communication is a fundamental course in the electronics and communication stream.The objectives of this course is to introduce the basic principles that underlie the analysis and successful design of a digital communication system. Digital communication systems have been used in all modern communication systems. Emphasis is placed on understanding system design goals and to optimize the tradeoff among basic system parameters such as signal-to-noise ratio, bandwidth, etc.

INTENDED AUDIENCE  : Electronics and Communications Engineering students and professionals

PREREQUISITES : Basic idea of Signals and Systems, and probability theory

INDUSTRY SUPPORT : Telecommunication Industry, e.g., Qualcomm,Ericson, Huawei
Course Status : Completed
Course Type : Elective
Duration : 12 weeks
Category :
  • Electrical, Electronics and Communications Engineering
  • Communication and Signal Processing
Credit Points : 3
Level : Undergraduate
Start Date : 24 Jan 2022
End Date : 15 Apr 2022
Enrollment Ends : 07 Feb 2022
Exam Date : 23 Apr 2022 IST

Note: This exam date is subjected to change based on seat availability. You can check final exam date on your hall ticket.

Page Visits

Course layout

Week 1  :  Introduction to digital communications: Interfaces and channels for digital communications
Week 2  :  Geometric representation of signals: Geometric representation of signals, Gram-Schmidt orthogonalization, Geometric interpretation of signals
Week 3  :  Review of random variables: Introduction to random variables, joint probability density function, characteristic functions, derived distributions
Week 4  :  Review of random process: Introduction to random processes, Gaussian process, Linear functional of random process, Stationary and wide sense stationary random process, Power spectral density, White Gaussian noise
Week 6  :  Waveform coding: Pulse code modulation, Differential pulse codemodulation, and delta modulation
Week 7  :  Modulation - I: Complex baseband representation, degrees of freedoms, linear modulation, spectral description of linearly modulated signals
Week 8  :  Modulation – II: Nyquist criterion, raised cosine family of pulses, Intersymbol interference
Week 9  :  Modulation - III: Coherent binary modulation formats, e.g., ASK, FSK and PSK, Coherent QAM, M-ary modulation techniques, Orthogonal and biorthogonal modulation
Week 10  :  Hypothesis testing: Optimum decision region in AWGN, Maximum Aposteriori Probability (MAP) and Maximum Likelihood Receiver, Theorem of irrelevance
Week 11  :  Performance analysis of binary and M-ary signaling schemes: Performance analysis of binary signaling schemes, performance analysis of M-ary signaling schemes, bit-level demodulation, Non-coherent communication: Composite hypothesis testing, optimal demodulation for non-coherent communication
Week 12  :  Performance analysis of non-coherent communication: Performance of binary and M-ary non-coherent communication

Books and references

1. Robert G. Gallager, “Principles of Digital Communication,” Cambridge University Press, 2008.
2. Upamanyu Madhow, “Fundamentals of Digital Communication,” Cambridge University Press, 2008.
3. John M. Wozencraft and Irwin M. Jacobs, “Principles of Communication Engineering,” Wiley, 1965.
4. John G. Proakis and Masoud Salehi, “Fundamentals of Communication Systems,” Pearson Education India, 2007.
5. Simon Haykin, “Communications Systems,” John Wiley, 2008.
6. Amos Lapidoth, “A foundation in Digital Communication,” Cambridge University Press, 2017.
7. Bernard Sklar, “Digital Communications,” Prentice Hall, 2001. 

Instructor bio

Prof. Abhishek Dixit

IIT Delhi
Abhishek Dixit, M.Tech. (IITD: 2010) and Ph.D. (Ghent University, Belgium: 2014) Professor Abhishek Dixit is working with the Department of Electrical Engineering, IndianInstitute of Technology Delhi, New Delhi (India) since December 2015. His research interests pertain to the domains of digital communications, error control codes, optical communications, optical networks, optical wireless communication links and networks, and fiber-wireless converged networks.

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.
The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).
Date and Time of Exams: 23 April 2022 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.
Registration url: Announcements will be made when the registration form is open for registrations.
The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.
Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.


Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Madras .It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team

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