DIGITAL COMMUNICATION
Academic year and teacher
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- Versione italiana
- Academic year
- 2016/2017
- Teacher
- VELIO TRALLI
- Credits
- 6
- Didactic period
- Primo Semestre
- SSD
- ING-INF/03
Training objectives
- The course presents and analyzes the basic principles for the realization of a digital communication system.
The student will gain the knowledge of:
- the basic principles of detection theory and the methods to design receivers for modulated and encoded digital signals (symbol estimation and synchronization)
- the techniques for digital communications over frequency selective channels: equalization techniques, multicarrier systems, spread-spectrum techniques.
At the end of the course the student will be able to:
- understand and define the structure of the basic digital communication systems and the algorithms behind the different functionalities
- understand and define basic techniques and algorithms for digital transmission over frequency selective channels. Prerequisites
- Knowledge of the fundamentals of signal theory and communication systems, probability theory and statistics, linear algebra
Course programme
- - Introduction to the principles of binary transmission and detection
- Signal space and geometrical representation of signals, transmission with M waveforms, maximum likelihood and minimum distance estimation, probability of error
- Digital modulated signals with memory, CPM signals, MLSE receivers and their application to CPM signals and to linearly modulated signals with intersymbol interference or coding.
- MSK signals and their receivers, receivers for signals with unknown phase and application to MPSK
- Synchronization in coherent and noncoherent receivers, carrier frequency, phase and timing synchronization, open-loop and closed-loop estimation, performance evaluation
- Characterization of multipath propagation channels, frequency and time selectivity, small-scale stationary models
- Receivers for frequency selective channels, linear equalizers, ZF and MMSE criteria, LMS algorithm, fractionally-spaced equalizers, DFE equalizers, RLS algorithm, channel estimation in MLSE receivers
- Direct-sequence spread-spectrum systems, Rake receiver, CDMA multiple access
- Multicarrier systems, OFDM system and its discrete-time implementation, performance
- Advanced transmission techniques and applications Didactic methods
- The course is based on classroom lessons that cover all the items in the programme. The presentation of the theory is followed by selected examples or exercises. At the end of the course, each student is required to individually investigate an advanced topic chosen in a list provided by the teacher. This investigation includes reading and understanding a book section and/or a scientific article, and the composition of a report on the topic.
Learning assessment procedures
- The final examination is suitably organized to check the achievement of the learning objectives as outlined above. It consists of a single oral part that includes the discussion of the chosen advanced topic and some questions addressing the theoretical parts of the programme. If requested, English can be used for the final exam.
Passing the final exam is the proof that knowledge and abilities outlined in the training objectives of the course have been achieved. Reference texts
- 1. J.G.Proakis, Digital Communications, McGraw Hill
2. S.G.Wilson, Digital Modulation and Coding, Wiley
3. U.Mengali, M.Morelli, Trasmissione numerica, McGraw Hill
4. G.M.Vitetta, Fondamenti di trasmissione numerica con applicazioni alle radiocomunicazioni - Parte I: Le modulazioni numeriche, Pitagora
The content of the course is almost completely covered by the textbook 1. The other textbooks, together with 1, can be used to enlarge the knowledge on specific topics.
