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22-Elec-A3 Signals and Communications: December 2015

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Discrete-Time System — Transfer Function, Stability and Impulse Response
  2. Question 2 Fourier Series, Power Spectral Density and Band-Pass Filtering
  3. Question 3 Amplitude Modulation — Waveform, Efficiency, Spectrum and Detection
  4. Question 4 PCM Transmission of an Audio Signal
  5. Question 5 Frequency Modulation with a Two-Tone Phase Deviation
  6. Question 6 Spectral Inversion and Frequency Conversion

Start with Question 1 →

Paper format: 07-Elec-A3 Signals and Communications, December 2015 — 3 hours, closed book, a standard non-programmable calculator permitted. Six questions of equal value (20 marks each); any five constitute a complete paper, and only the first five presented are marked. All six are solved here, since the set is intended as a study resource.

Reference texts. B. P. Lathi and Z. Ding, Modern Digital and Analog Communication Systems, 4th ed. (AM/FM, PCM, frequency conversion); A. V. Oppenheim and A. S. Willsky, Signals and Systems, 2nd ed. (Fourier series, LTI systems); J. G. Proakis and D. G. Manolakis, Digital Signal Processing, 4th ed. (z-transform, difference equations, stability); S. Haykin, Communication Systems, 5th ed. (modulation and detection).