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17-Phys-B4 Signals and Communications: December 2015

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

  1. Question 1 Discrete-Time Feedback System — Transfer Function, Stability, Impulse Response
  2. Question 2 Fourier Series, Power Spectral Density and Bandpass Filtering of a Periodic Pulse Train
  3. Question 3 Amplitude Modulation — Waveform, Efficiency, Spectrum, Envelope, Detector
  4. Question 4 PCM — Sampling Rate, Quantization Bits, Bit Rate, TDM Bandwidth
  5. Question 5 Multitone FM — Message, Power, Peak Deviation, Bandwidth, Demodulator
  6. Question 6 Bandpass Spectral Mirroring and Frequency Conversion with a Limited Local Oscillator

Start with Question 1 →

Paper format. 98-Phys-B4 Communications, National Examination December 2015 — a three-hour closed-book examination (a standard non-programmable, no-text-storage calculator is the only aid permitted). The cover page states any five of the six questions constitute a complete paper, with only the first five as they appear in the answer book marked; every question is nonetheless answered in full below so the paper remains a complete study resource. All six questions carry equal value. The exam's own sixth question carries no printed number on the page; it is labelled Question 6 here for completeness.

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