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Digital Communication Systems

Module ID

Υ502

Semester

5

Hours/Week - ECTS

5 – 5

George Karetsos

Professor

Learning Outcomes

Upon completion of the course, students will be able to:

  • Encode a signal source and find its entropy.
  • convert a signal from analog to digital and find the quantization error.
  • find the required bandwidth for PCM systems.
  • create geometric representations from the waveforms of the signals.
  • know the function and how to use the correlation demodulator.
  • know the function and how to use the custom filter demodulator.
  • know the function and how to use the optimal carrier.
  • They will familiarize themselves with the issue of demodulation and understand the relevant methodologies for recovering the transmitted signals at the receiver.
  • Determine the potential for error for various digital modulation techniques and understand ways to minimize it.
  • study the issue of digital transmission over limited bandwidth channels and understand the problems arising from this fact.
  • design signals suitable for bandwidth-limited channels.
  • specify AWGN channel capacity and basic coding principles for reliable communication.
  • solve design problems of digital telecommunication systems using appropriate PC software.

Indicative Module Content

  • Sources of information, entropy, and coding.

  • Nyquist theorems (regarding the required bandwidth).

  • Analog to digital conversion: Pulse Code Modulation (PCM), Differential Pulse Coding (DPCM), and Delta modulation (DM).

  • Introduction to the concept of noise and noise channel modeling (Gaussian white noise additive, AWGN).

  • AWGN channel capacity.

  • Baseband digital transmission techniques: Pulse Amplitude Modulation (PAM) and Pulse Position Modulation (PPM).

  • Optimal detector design for digitally modulated signals in the presence of Additive White Gaussian Noise.

  • Intersymbol interference phenomenon and its elimination with raised cosine filters.

  • Passband digital modulation techniques: Phase shift keying (PSK), Phase shift and amplitude modulation (QAM), frequency-shift keying (FSK).

  • Error probability of digital modulation techniques