Digital communications M - Z
Academic Year 2022/2023 - Teacher: Sergio PALAZZOExpected Learning Outcomes
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Knowledge and understanding the most important elements regarding digital communications Capture and
understanding the basic elements to analyze digital transmission techniques,
and the procedures for achieving the main parameters characterizing a digital
and analog communication system.
Applying knowledge and understanding of the state-of-art technologies of digital communications systems, also targeted to the practical application in non-usual contexts Skills development for analysis of reference systems of analog and digital communications systems, also aimed at the individuation of the main system parameters (signal-to-noise ratio, bit error rate, bandwidth, energy consumption, circuit complexity). The target is to allow the student to use this knowledge also for future systems, although different from the ones studied in this course.
Making judgements of the main topics of this course Outgrowth of a sufficient level of making judgements in discovering the main peculiarities of analog and digital communications systems and of the available tools not only for the design of simple systems like the ones studied during the course, but also of more complex systems, like satellite communications and 5G, which require further maturation of what studied during the course.
Communication skills finalized to heterogeneous interlocutors Outgrowth of an effective and high-level communications skill for topics regarding analog and digital transmission, modulation systems and transmission devices.
Learning skills of the evolutions of the topics studied during the course, independently Outgrowth of skills for autonomous training regarding scientific evolution and specific digital communications technologies to deepen new transmission technologies for cables, fiber and wireless, also with reference to techniques applied to ADSL, LTE, 4G, 5G and 6G. |
Course Structure
The course is composed of a part of theory (35 hours), and a part of practice (15 hours).
In the case lectures will be partially or fully realized remotely by a video-communications platform, what declared above could undergo some changes, in order to achieve the objectives targeted in this syllabusRequired Prerequisites
Convolution
Bandwidth of a base-band and passband signal
Power spectrum and autocorrelation function
Periodical signals
Probability theory, random variables and random processes
Time-invariant linear systems and distortions
Sampling of a signal and interpolation from a sequenceAttendance of Lessons
Detailed Course Content
The course is structured in the following Elementary Teaching Units (ETU):
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Contents |
HOURS |
Reference material |
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ETU 1: Baseband pulse and digital signaling · *Reference scheme; Pulse Amplitude Modulation; Transmission formatting filter · *Binary and Multilevel Line Codes. Power Spectrum. Spectral Efficiency. · *Orthogonal and orthonormal Series Representation of Signals; Multidimensional tranmission. · *Intersymbol Interference (ISI) and Nyquist Criteria · *Bit error rate (ber) for base-band digital transmissions · Diagrams of digital modulators and demodulators · Antennas and 5G systems |
24 |
Couch: Chap. 3.1 and 3.2 and material provided by the lecturer |
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ETU 2: Analog modulations · *Complex Envelope Representation of Bandpass Waveforms; Definitions: Baseband, Bandpass, and Modulation · Spectrum and power spectrum of band-pass signals · Average and peak power of band-pass signals. · *Amplitude, Phase and frequency modulation of analog signals |
10 |
Couch: Chap. 5.1 – 5.5 and Chap. 7.8 and material provided by the lecturer |
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ETU 3: Digital modulations · *Binary modulations: OOK, BPSK and 2-FSK: complex envelope and modulated signl; Power spectrum of the digital envelope and of the modulated signal; *transmission bandwidth, *Bit error rate · *Multidimensional modulations: MPSK, QPSK and N-QAM: complex envelope and modulated signal; Power spectrum of the digital envelope and of the modulated signal; *transmission bandwidth, *Bit error rate · *DMT and OFDM transmission systems |
10 |
Couch: Chap. 7.1 – 7.7 and material provided by the lecturer |
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ETU 4: Baseband transmission of analog signals · *PCM modulation. Sampling, Quantization, and Encoding · *Uniform and non-uniform Quantization · Design of Telephone PCM |
6 |
Couch: Chap. 3.3 and material provided by the lecturer |
Textbook Information
- [Cou] Leon W. Couch, Digital & Analog Communication Systems (8th Edition), Pearson Education Limited, 2013.
- [Pro]
J. G. Proakis, M. Salehi, Communication System Engineering, Prentice Hall
Learning Assessment
Learning Assessment Procedures
The exam consists of an optional in-itinere test and an oral exam.
The in-itinere test, lasting 3 hours, is evaluated with a score that will be taken into account during the oral examination.
In particular:
· who pass the test with a “A” score will be able to participate to the exam with a reduced program, in which there will not be any numerical exercise. He will also have to answer only two questions, while the third will be considered passed with a correct answer.
· who pass the test with a “B” score will be able to take the exam with a reduced program, in which there will be only some supplementary exercises to cover the gaps shown in the in-itinere test. He will also have to answer only two questions, while the third will be considered passed with a correct answer.
· who do not pass the in-itinere test will have to take an exam with the full program, as well as those who have not participated in the in-itinere test.
Who pass the in-itinere test with a “B” score will be able to take the exam as “A” score, but obtaining a final score that cannot exceed 27/30.
The oral exam consists of 3 questions, one of which will concern the development of a numerical exercise or the description of a GNURadio project among those previously provided by the teacher.