Digital Communications
Keywords |
Classification |
Keyword |
OFICIAL |
Electrical and Computer Engineering |
Instance: 2024/2025 - 1S
Cycles of Study/Courses
Acronym |
No. of Students |
Study Plan |
Curricular Years |
Credits UCN |
Credits ECTS |
Contact hours |
Total Time |
PDEEC |
3 |
Syllabus |
1 |
- |
6 |
42 |
162 |
Teaching Staff - Responsibilities
Teaching language
English
Objectives
The curricular unit is not designed to be an exhaustive survey of the area of digital communications. On one hand, it revisits or complements students’ background in digital communications. On the other hand, it brings to students’ attention some of the new topics and challenges in the area of digital communications.
Learning outcomes and competences
At the end of this curricular unit, the relevant learning outcomes are:
•Familiarity with the basic principles behind digital communications, digital communications transmitters and receivers as well as conventional coding techniques.
•Introduction to more advanced topics in digital communications namely coding techniques, OFDM systems, spread-spectrum systems and Software Defined Radio.
•Ability to extract information from scientific papers in the area.
•Practice on technical writing and presentation skills.
Working method
Presencial
Pre-requirements (prior knowledge) and co-requirements (common knowledge)
Non applicable.
Program
1. Pulse Modulation: sampling, quantization and coding processes, Time-Division Multiplexin,.
2. Baseband Pulse Transmission: Matched Filter, Error Rate Due to Noise, Nyquist’s Criterion and ISI, Correlative-Level Coding and Adaptive Equalization.
3. Time, frequency and statistical multiplexing. PDH SDH hierarchies. ATM). Frame Relay.
4. Passband Digital Transmission: Geometric Representation of Signals, Coherent Detection of Signals in Noise, Binary and M-ary digital modulations and their relative performance.
5. Basic coding techniques: error detection and error correction; Block codes; Hamming codes; Cyclic codes; Convolutional codes; Interleaving.
6. Multicarrier Systems: Signaling with multicarrier. The Wireless channel characterization. Multichannel modulation with orthogonal pulses. OFDM modulation and synchronization.
7. Spread Spectrum: Direct Sequence Spread-Spectrum and Frequency Hoping Spread Spectrum.
8. Software Defined Radio.
Mandatory literature
Simon Haykin;
Communication systems. ISBN: 0-471-30584-7
John G. Proakis;
Digital Communications. ISBN: 0-07-113814-5
Shu Lin;
Error control coding. ISBN: 0-132837-96-X
Sílvio Almeida Abrantes Moreira;
Códigos correctores de erros em comunicações digitais. ISBN: 978-972-752-127-2
Teaching methods and learning activities
It is planned that some of the theoretical classes will be crash-courses, where the relevant background on digital communications is revisited. The focus the is shifted to more advanced topics.
Assignments are proposed to students (MatLab/Simulink experiments regarding the subjects covered by the curricular unit).
Software
Matlab
Evaluation Type
Distributed evaluation without final exam
Assessment Components
Designation |
Weight (%) |
Apresentação/discussão de um trabalho científico |
30,00 |
Trabalho prático ou de projeto |
70,00 |
Total: |
100,00 |
Amount of time allocated to each course unit
Designation |
Time (hours) |
Apresentação/discussão de um trabalho científico |
20,00 |
Estudo autónomo |
50,00 |
Frequência das aulas |
36,00 |
Trabalho escrito |
56,00 |
Total: |
162,00 |
Eligibility for exams
From sufficient attendance to classes.
Calculation formula of final grade
•Assignments including simulation and report (70% weight of final grade).
•Final presentation and discussion (30% weight of final grade).
Examinations or Special Assignments
Non applicable.
Special assessment (TE, DA, ...)
Except for attendance, all other activities must be done.
Classification improvement
Non applicable.
Observations
Non applicable.