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17-Phys-B4 Signals and Communications: December 2016

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

  1. Question 1 Periodic Pulse Train Through Ideal Low-Pass and High-Pass Filters
  2. Question 2 Discrete-Time IIR System — Realization, Impulse Response, Stability
  3. Question 3 DSB and AM Modulation of a Staircase Message — Power, Efficiency, Bandwidth
  4. Question 4 PCM System Design — Sampling Rate, Bit Rate, SNR
  5. Question 5 Spectral Analysis of a Composite Message — Bandwidth Under DSB and SSB
  6. Question 6 VCO-Based FM Modulator — Output Expression, Demodulation, Carson Bandwidth

Start with Question 1 →

Paper format. 98-Phys-B4 Communications, National Examination December 2016 — 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.

Reference texts. A. V. Oppenheim and A. S. Willsky, Signals and Systems, 2nd ed. (Fourier series, sampling, z-transform); S. Haykin and M. Moher, Communication Systems, 5th ed. (AM/DSB/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).