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ĐH Bách khoa – ĐHQG Tp.HCM Faculty of Electrical and Electronics Engineering Department of Telecommunications

Tp.HCM, ngày 25/10/2012

Undergraduate Syllabus

DIGITAL COMMUNICATIONS Course Code: - Credit - No. hours - Grading

: 3 (3.1.4) Total: 60 LT: 45 : Quizes: Homeworks: Midterm exam:


BT: 15 15% 15% 20% Writing exam - 90 min

Grading scale 10/10 Final exam: 50% Writing exam - 120 min - Pre-requisite : - Signals and Systems and Communication Systems - Program : Advanced Program on Communications - Level : Senior EE Core course - Note :

405412 BTL/TL:


1. Course Objectives: The course provides a comprehensive knowledge at undergraduate level on Digital Communications. It covers the concepts of Signals and Systems and their implementations into digital communications systems. Students also are taught with problems and solving the major codings as well as signal detections in digital communication systems. Some practically digital communication systems are also included as a part of the course appliactions. A minor project on Digital Communication System is included and taken into account of Homeworks evaluation.

2. Course outline: The course is separated into 9 chapters throughout the concepts on digital communications. Chapter 1 is the review on Signals and Systems where the most important background related to the response of a system and signal analysis is discussed. Chapter 2 is generated with the media of communication links. Chapter 3 is introduced the concept of signal spaces, how one can decomposes a signal in an orthogonal or orthonormal space. The chapter presents also a common technique for maximizing the signal-to-noise ratio (SNR) by using matched filters in digital communication systems. Chapter 4 is discussed about the source coding for reducing the redundancy inside signal sources. Chapter 5 is related to the digitizing of analog signals in digital communications, the common methods for implementing of this issue with the Pulse Code Modulation (PCM) and the Delta Modulation (DM). he tiem division Multiplexing is also introduced in this chapter. Chapter 6 is discussed about the Bandpass modulations in digital communications with the ASK, FSK, PSK and QAM. Chapter 7 is intended to be the most important chapter with channel codings which are aimed to process for estimating the probability of errors in digital communication systems. Chapter 8 is presented the fundamental concept of encryption techniques where the Data Encryption Standard (DES) is included for data protection for security purposes. Chapter 9 is with some practical digital communication systems such as Mobile systems, CDMA systems and satellite systems.

3. Textbook and references: PĐT, Mẫu 2008-ĐC


Syllabus : 409401

PĐT, Mẫu 2008-ĐC

[1] Bernard Sklar, “Digital communications: Fundamentals and Applications”, Prentice Hall, 2001,ISBN: 0-13-084788-7 [2] A . B . Carlson, P. B. Crilly, J.C. Rutledge, "Communication Systems", third ed., McGraw-Hill Inc., New York, 2002, ISBN: 0-07-112175-7 [3] John G. Proakis and Masoud Salehi, “Communication systems engineering”, Prentice Hall, 2002, 2nd edition, ISBN: 0-13-095007-6 [4] J. G. Proakis, “Digital Communication”, third ed., McGraw-Hill Inc. New York, 1995, ISBN: 0-07-113814-5 [5] H.P.E.Stern and S. A. Mahmoud, “Communication Systems, Analysis and design”,Prentice Hall, 2004, ISBN: 0-13-121929-4. [6] Behrous A. Forouzan, “Data Communications and networking”, Mc. Graw Hill, 2003, ISBN 007-123241-9 [7] Other referenced books for Digital Communications

4. Learning Outcomes On sucessful completion of this course students should have the following knowledge and skills: Knowledge: Digital Communication Systems Cognitive Skills: Analysis and Design of Digital Communication systems Subject Specific Skills: Signal Processing in Digital Communications Upon completion of this course, students can be able to deal with matters related to: 1. Basic characterizations about signals and systems 2. Optimum designs for digital communications based on efficient signal processing for improving SNR and reducing ISI. 3. Source Coding and optimal coding sources 4. Digitizing analog signals in digital communication systems 5. Bandpass modulations (analog transmission for digital signals) 6. Channel codings in FEC systems and Viterbi decoding 7. Treat the Data Encryption Standard DES and Advanced DES. 8. Practical digital communication systems Transferable Skills: 1. Ability to conduct research in digital communication systems.

5. Learning Strategies & Assessment Scheme: Learning strategies: - Read lecture notes and reference books before each class - Participate lecture hours, apply theory to solve exercises and homeworks - Use Matlab in simulation, analysis and design problems in digital communication systems Assessment scheme: - Quizes (15%) - Homeworks (15%) - Mid-term exam (20%) - Final exam (50%)

6. Instructor: • Assoc.Prof. Dr. Thuong Le-Tien

- Faculty of Electrical and Electronics Engineering Tr.2/5

Syllabus : 409401

PĐT, Mẫu 2008-ĐC

7. Course content: Week 1,2


Ref. Chapter 0: Outline and some instructions to students related [1],[2],[3] to the course.

Note 8 hours

Chapter 1: Review on Signal and Systems • •

Block Diagram of a general digital communicaiton system Important features of a digital communicaiton system (DCS) • A comparison of analog and digital communications • Shannon theorem for channel capacity • Claasification of signals and systems • Random signals and autocorrelation function • Noise in communication systems • Mô hình kênh thông tin • Interleaving, multiplexing and coding Exercises.



Chapter 2: Transmission medium • Classification of transmission medium • Cable links: UTP, STP, Coaxial cables • Radio links • Optical links Multiple-choice based exercises.


4 hours

Chapter 3: Matched Filters and Signal Space


6 hours


6 hours

• • • • • •

Format and baseband signals Demodulation and detection in DCS Maximizing SNR by using matched filters Receivers using matched filters and correlators Signal space and norm of signals Gram-Schmidth procedure for finding orthonormal signal spaces Exercices


Chapter 4: Source Coding • • •

Mathematical models in coomunications Logarith measurements of information, entropy Coding for discrete sources • Discete Memoriless Source • Lempel-Ziv algorithm • Analog source coding and optimum quantization Exercises

7 8-9 10,11

Review of midterm exam Midterm exam Chapter 5: Digitizing analog signals - PCM and DM • • •

4 hours [2]

8 hours

Pulse code modulation (PCM) for analog signals: Uniform and non-uniform quantization. Delta Modulation (DM) and Slope overloading Adaptive modulation Tr.3/5

Syllabus : 409401

PĐT, Mẫu 2008-ĐC





Time Division Multiplexing (TDM) and TDMA: European and North America standards Exercises



Chapter 6: Bandpass Modulations • Analog transmission for digital signals • Amplitude Shift Keying (ASK), its bandwidth and constellation • Frquency Shift Keying (FSK), its bandwidth and constellation • Phase Shift Keying (PSK), its bandwidth and constellation • Quadrature Amplitude Modulation (QAM) its bandwidth and constellation • Some practical applications. Exercises


Chapter 7: Channel Coding


8 hours


4 hours

[1],[2],[3] [4],[5],[6] [7]

4 hours

• •

FEC and ARQ models Linear block codes • Generation matrix and prity check • Cyclic code • Syndrome and error controls • Convolutional code • Code tree and state diagram • Maximumlikelohood detection algorithm • Turbo Code Exercises




Chapter 8: Data Encryption and Decryption. • Classic encryption models • Secrete keys, private and public keys • Permutation and Substitution in data encryption systems • Data Encryption Standard (DES) • Advanced Data Encryption Standard (ADES) Exercise


Chapter 9: Practical Digital Communication Systems

** **

• • • •

Spread Spectrum Systems Code Division Multiple Access (CDMA) systems Cellular phone systems Satellite Systems

Midterm exam content Chapter 1-5 Final exam content Chapter 3-9


Syllabus : 409401

PĐT, Mẫu 2008-ĐC

8. Contact information: + Assoc Prof. Dr. Thuong Le-Tien Cell: +84 903 787 989 Email: HoChiMinhCity, November 18th, 2013 Dean of Faculty of Electrical and Electronics Engineering


Assoc Prof. Dr. Thuong Le-Tien


48 405412 digital communications