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Oreste Andrisano

Professore emerito

Alma Mater Studiorum - Università di Bologna

Contenuti utili

Topics list related to the lectures - Fundamentals of Telecommunications

  1. Introduction to the course "Fundamentals of Telecommunications". Evolution of the TLC network. Frequency band. Main Application and services. Heterogeneous networks. Block Diagram

  2. Introduction to periodic signals: Fourier series for real signals

  3. Main applications: Heterogeneous networks. Different media. Mobile network structure. Multiple access. Spectrum and power efficiency.

  4. Data rates in mobile - block diagram of the transmission system. Performance in the presence of disturbance. Quality for analog and digital system.

  5. Examples of Fourier series expansion: quadratic waveform and sinosoidal tone.

  6. Complex exponential expression of Fourier series - comparison to the real case

  7. Block diagram of the communication system. Example of propagation characteristics: railway tunnel, simulation and measurement techniques. Linear circuit analysis. Transfer function. Complex numbers. Example: the RC cell. 3-dB bandwidth. Evaluation of the frequency response and introduction to the lab. experience.

  8. Fourier series: application to the cases seen in the laboratory

  9. First laboratory experience: quadratic waveform and sinusoidal tone - comparison between theory and practice

  10. Signal and Linear circuit analysis. dB definition and exercises. Summary on Fourier series. Aperiodic signals. Energy and Fourier transform. Various expressions. Network output for a general signal. Concept of filter

  11. Linear filter response, not distortion conditions, example of the Fourier integraòl evaluation of a pulse. Discussion on secondary lobes and associated periodic function.Filter design, ripple and attenuation. Step function at the input of an ideal lowpass filter.

  12. Exercises on logarithmic units and applications to the oscilloscope: ratio between Fourier series coefficients

  13. Exercise on linear filtering

  14. Second laboratory experience: RC filter

  15. Output of the response of an ideal lowpass filter to the step function. Distortion discussion. Response to a pulse as a sum of two steps. Time domain analysis: representation of a signal in the time domain. Definition and measure of the impulsive response . Choice of the duration value. Fourier transform of the Dirac operator. Connection between the frequency and domain analysis.

  16. Summary on frequency and time domain analysis. Impulse response of the ideal lowpass filter. Discussion about the product bandwidth and duration of a signal.FIR definition starting from the convolution theorem.Sampling process: sampled signal spectrum and anti-aliasiing conditions. Shannon theorem.

  17. Digital filtering implementation via DSP and simulink

  18. Third laboratory experience. A/D amd D/A conversion. Digital filtering.

  19. A/D and D/A conversion. Sampling process with discussion in the time and frequency domain. Expression of the signal as a function of the sampled values. Quantization and Coding. Evaluation od the quantization and signal to noise ratio as a function of number of bits per sample.

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