Digital
communications
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Professor(s)
▪ until 16 septembre
▪ Leslie Rusch
▪ afterwards
▪ Zoheb Hassan
▪ Paul Fortier
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Zoheb Hassan
▪ 2112 Pavillon Pouliot
▪ Téléphone : (438) 773-3608
▪ md-zoheb.hassan@gel.ulaval.ca
▪ Class in person
• Tuesdays, 13h30-15h30
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Teaching assistant
➢Rania Antar Eltaieb Abouelela
❑ rania.abouelela.1@ulaval.ca
❑ Pav. d’Optique et Photonique
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Face-to-face hybrid format
▪ Pre-recorded lectures (approximately 2-3 hours per
week, YouTube)
▪ Classroom lessons Tuesdays from 1:30 p.m. to 3:20
p.m.
▪ In-class quizzes, or synchronously (Gradescope)
▪ In-class exams
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Evaluations – GEL7014
▪ Assignments will be submitted on Gradescope
▪ Live quizzes on Gradescope, grades transferred to My
Portal after the last Quiz11
▪ Exam corrections returned on Gradescope
▪ All homework assessments will be done individually
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Evaluations – GEL7014
▪ Homework
▪ 3 assignments to turn in; 12% of final grade
▪ project; 17% of final grade
▪ Exams
▪ Midterm exam; 30% of final grade
▪ Final exam; 30% of final grade
▪ Quiz
▪ weekly; 11% of final grade
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Dates
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Dates- Quiz
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Dates- homework
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Dates- exams & project
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Weekly quiz
➢ Gradescope
❑ you need a smartphone or laptop every week!
❑ 10 binary questions (true/false)
❑ 10 minutes
❑ covering the videos (see also specific objectives)
➢ In class
❑ Second quiz version at the end of the lecture
❑ Best of two quiz grades will be kept
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In Class
▪ Tuesday 13h30
▪ quiz
▪ discussions, questions, etc.
▪ second quiz version (only in class)
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Discussions, questions, etc.
▪ One subject in the videos this week that you did
not understand
▪ One subject in the videos this week that your
understood
▪ How would you explain “this” concept ?
▪ What was the most difficult concept this week?
▪ What topic looked familiar to you this week?
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Sources of information
➢ Required textbook
❑ Sklar, Digital Communications
➢ Useful textbook
❑ Ziemer, Principles of Communications
❑ Proakis, Digital Communications
➢ WWW
❑ Matlab
❑ PowerPoint
❑ Previous exams
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Important links
YouTube channel (videos)
▪ GEL7114 Digital Communications – YouTube
To submit assignment and quiz
▪
Gradescope: (Access code : VWPJV4)
▪ GEL4200/GEL7014/GEL7114 Dashboard | Gradescope
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Web Page on MonPortail
GEL 7114
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Web Page on MonPortail
GEL 7114
Not obigatory
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GEL4200/7014/7114
Course overview
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Prerequisites
➢GEL-2001
❑ Signal Analysis
(aka Fourier Analysis or Signals and Systems)
➢STT-2920
❑ Probability for engineers
➢GEL-3006
❑ Communications systems
o Lines of code, power budget, propagation, etc.
o Analog communications
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Digital vs. analog
➢ Digital – finite # states
❑ Binary
o 2 states – logical zero and logical one
❑ M-ary
o m states - alphabet of m symbols
➢ Analog - Infinite states
➢ Digital benefits
❑ re-generation of the signal
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Digital benefits
➢ more reliable
❑ compatibility with error corrector codes
➢ cheaper and smaller
❑ Digital electronics integration
➢ more flexible
❑ variety of solutions in digital electronics
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Digital disadvantages
➢ more complex
❑ more signal processing
❑ more synchronization
➢ less efficient in bandwidth
➢ abrupt degradation
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Error
➢ Analog
❑ distortion
❑ SNR
❑ mean square error
➢ Digital
❑ Probability of error
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Modules 1, 2, 3
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Modules 4, 5, 6
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