Academic Staff
Faculty in charge:
στρατάκης δημήτριος
Stratakis DImitrios
Assistant Professor
Αναπληρωτής Καθηγητής
+30 2810-379891, +30 2810-379760
COURSE CONTENTS
THEORY
Description:
The course focuses on the study of telecommunication systems and signals in the frequency as well as the time domain. The effect of noise is also studied (briefly). Basic concepts such as the signal spectrum and the system transfer function are related via fundamental relations of Fourier analysis.
The backbone of the course is the presentation of the principles, methodology and the effects upon the signals of the ampitude, phase, frequency modulation as well as digital modulation techniques.
Layout:
- Basic Concepts :System and waveform analysis in the frequency domain, Discrete and continuous spectra, Fourier analysis and Transformations, The system transfer function, System response in harmonic, impulse and step function input, Delta function and the importance of impulse response and convolution integrals, Normalized power and the Parseval Theorem.
- Amplitude Modulation:The spectrum and bandwidth of an amplitude modulated signal, DSB, DSB-SC and SSB modulation, Demodulation techniques, Frequency Division Multiplex (FDM) signals.
- Frequency Modulation:Phase modulation, Frequency modulation, The spectrum and bandwidth of a frequency modulated signal, The role of Bessel functions and â coefficient in the signal bandwidth, Frequency modulation of constant bandwidth, NBFM, WBFM, Frequency Modulators, Indirect Frequency modulation (Armstrong), Frequency multiplication, FM demodulation, FM stereo, signal, transmitter and receiver.
- Digital Signal Modulation Techniques:Analog to digital signal conversion, The sampling theorem, Quantization and quantization error, Pulse Amplitude Modulation - PAM, Pulse Code Modulation PCM, Companding, PCM Multiplex, Differential PCM, Delta modulation, ADM, Vocoders, PSK, ASK, FSK, MSK, Characteristics of data transmission.
- Noise:Condensed presentation of noise in the above mentioned telecommunications systems.
LABORATORY
A series of laboratory exercises will cover the theoretical part of the course. Also using special software simulation packages (Python, MatLab), simple telecommunication systems will be simulated in PC's.
- Spectrum analysis
- AM modulation-demodulation
- FM modulation-demodulation
- Studying of Filters
- A / D conversion
- PCM
- Delta modulation
- Simulation of FM communication system
- Simulation of PCM communication system
RECOMMENDED BIBLIOGRAPHY
- Τηλεπικοινωνιακά συστήµατα, Taub/Schilling (Ελλην. έκδοση), McGrawHill, 1995, ISBN: 960-7219-32-5
- Communication Systems, A. Bruce Carlson, McGraw-Hill, 1986, ISBN: 007009960
- Communication Systems, S. Haykin, John Wiley & Sons, 2000, ISBN:0471178691
- IEEE Communications magazine, www. Comsoc.org/~ci
- Web sites, (οι σχετικές διευθύνσεις θα δίδονται από τον διδάσκοντα)