Universidade Nova de Lisboa

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Faculdade de Ciências e Tecnologia

Wireless Communications

Code

7303

Academic unit

Faculdade de Ciências e Tecnologia

Department

Departamento de Engenharia Electrotécnica

Credits

6.0

Teacher in charge

Paulo da Costa Luís da Fonseca Pinto, Rodolfo Alexandre Duarte Oliveira

Weekly hours

4

Total hours

75

Teaching language

Português

Objectives

The main goal it is to give to the students the necessary skills to understand and to establish connection between the following aspects:

Cellular planning

Concepts of frequency planning associated to cellular networks. Frequency planning to achieve optimal system capacity. Frequency re-use strategies and capacity maximization techniques with resource to the sectorization, micro and pico cells. The RF interference problem in cellular systems.  

Propagation aspects

Limitation propagation aspects related with coverage planning, as ground reflection and obstacle diffraction. Knowledge of the different propagation models normally adopted in the project of mobile communications systems. Capacity to carry through the relation with different inherent project propagation environments. Channel type identification and adoption of the adjusted mathematical model suitable to the characterization of the existing channel type. Diversity techniques used for fading compensation, due to propagation multi-path.  

Transmission in mobile communications

Understanding the modulation techniques used for radio communications and the limitations. Understand the advantages and characteristics that justify the choice of one modulation in a mobile communication system. Spectral limitations and power amplification problems, associated to the digital modulations normally adopted. Identify the necessity of detection and correction codes and the applicability context of each one.  

Systems
System analysis including GSM, UMTS and Wireless Lans, topology and constitution. Access and encryption techniques. Protocol analisys. Codification structures. Services.

Subject matter

1. Introduction.
1.1. Evolution of the mobile communications
1.2. Typical architecture
1.3. Private mobile radio systems


2. Basic concepts in the cellular planning
2.1. Frequency re-use
2.2. Strategies for channel attribution
2.3. Handoff methods
2.4. Interference

2.4.1. Co-canal
2.4.2. Adjacent canal
2.4.3. Techniques for interference reduction
2.4.4. Interference impact in system capacity

2.5. Techniques for capacity improvement

2.5.1. Cellular standards/frequency planning
2.5 2. Sectorization and continuous power adjustment
2.5.3. Concept of dynamic channels allocation
2.5.4. Cell division
2.5.5. Micro-cells

3. Propagation aspects
3.1. Propagation limitations

3.1.1. Propagation in free space/ Friis formula
3.1.2. Specular reflection and dispersion
3.1.3. Esteem of the signal in "plain land"
3.1.4. Obstacles diffraction
3.1.5. Doppler effect

3.2. Propagation models


3.2.1. Empirical and deterministic models
3.2.2. Propagation environments classification
3.2.3. Okumura-Hata model

3.3. Propagation multi-passage
3.4. Slow and fast fade-out
3.5. Statisticians of the fade-out in mobile communications


4. Transmission in mobile communications
4.1. Basic concepts
4.2. Digital modulations


4.2.1. Line codes
4.2.2. DEP and bandwidth
4.2.3. Phase modulation
4.2.3.1. BPSK
4.2.3.2. DPSK
4.2.3.3. QPSK and O-qpsk
4.2.3.4. Emission and reception structures
4.2.4. Modulation of involving constant

4.2.4.1. FFSK
4.2.4.2. MSK
4.2.4.3. GMSK

4.3. Channel codification

4.3.1. Block codes
4.3.2. Convolucionais codes
4.3.3. Turbo codes
4.3.4. receivers structures
4.3.4.1. Equalization
4.3.4.2. Diversity

5. systems
5.1. System GSM (Global System will be Mobile Communications)

5.1.1. Characteristics of systems GSM and DCS 1800
5.1.2. Topology and components of net GSM
5.1.3. Channel types
5.1.4. Multiple access techniques(FDMA/TDMA)
5.1.5. Encryption
5.1.6. GSM frame structure
5.1.7 Handover and rooming procedures
5.1.8. Establishment and guiding of calls

5.2. UMTS (Universal Mobile Telecommunications System)

5.2.1. Evolution to the systems of mobile communications of 3ª generation
5.2.2. UMTS technology
5.2.3. Access techniques
5.2.4. UTRAN
5.2.5. Broadband mobile services supported in UMTS

5.3. Local wireless networks5.3.1. Introduction to 802.11


5.3.2. General technology characteristics
5.3.3. Criteria of sizing of cells / capacity
5.3.4. Physical channel and data structures
5.3.5. Integration with other mobile communications systems

Bibliography

“Wireless Communications, Principles & Practice”, Theodore S. Rappaport, Prentice Hall Communications Engineering and emerging Technologies Series, 1999.
“UMTS Networks Architecture, Mobility and services”, Heikki kaaranen, Ari Ahtiainen and Laurie Laitinen, John wiley and Sons.
“GSM  Switching, Services and Protocols”, Jörg Eberspächer, Hans- Jörg Vögel e Christian Bettstetter, John Wiley & Sons, 2001. 
“802.11 Wirelless networks the definitive Guide”, Matthew s. Gast, O’Reilly, 2002

Additional bibliography

Mobile Cellular Telecomunications Systems, William C. Y. Lee, McGraw-Hill Book Company, 1990.

Mobile Radio Communications, Raymond Steele, Pentech Press Publishers-London, 1992.
Communications systems, A. Bruce Carlson, McGraw-Hill,  2001.
 

 

Teaching method

The course consists on two weekly sessions of theoretical-pratical seminars with the duration of one hour and half each. There is also a laboratory part with one weekly session of two hours. In the laboratory the students must perform two group projects (two students per group).

Evaluation method

General Rule

The assessment is composed by a theoretical part and a laboratorial part. The student must have a minimum of 9.5 point in each part 

The final grade for the approved students (in any of the possible dates of exams) is weighted in 70% for the theoretical part and 30% for the laboratorial part

Theoretical Part

The assessment of the theoretical part can be distributed or centralized:     

Distributed assessment – consists on the execution of two mid-term tests. On the date of the final exam it is possible to repeat one mid-term test upon invitation from the structors. The theoretical grade is calculated using the following formula:            

theor_grade = 35% 1st test + 35% 2nd test       

Centralized assessment – consists on the execution of a final exam. In this case the theoretical grade is the grade of the exam. Students that opted by the distributed assessment can change to the centralized assessment any time during the semester.

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