NivaarExam PrepOfficial exam papers ↗

17-Phys-B4 Signals and Communications: December 2014

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

  1. Question 1 Fourier Transform, Spectra and Filtering of a Delayed Exponential
  2. Question 2 Half-Wave Rectifier, AC Coupling and Integration of a Cosine
  3. Question 3 PCM Sampling, Quantization and Multiplexed Bit Rate
  4. Question 4 Modulator Waveforms and Demodulators for a Square-Wave Message
  5. Question 5 Superheterodyne Receiver — LO Tuning, Image Frequency and Front-End Filter
  6. Question 6 Discrete-Time Causal System — Difference Equation, Transfer Function and Stability
  7. Question 7 AM Signal — Time Domain, Spectrum, Envelope and Demodulation

Start with Question 1 →

Paper format. 98-Phys-B4 Communications, National Examination December 2014 — 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 seven 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 seven questions carry equal value.

Reference texts. A. V. Oppenheim and A. S. Willsky, Signals and Systems, 2nd ed. (Fourier transform properties, LTI convolution, the sampling theorem); S. Haykin and M. Moher, Communication Systems, 5th ed. (AM/DSB/FM/PM modulation, PCM, the superheterodyne receiver); B. P. Lathi and Z. Ding, Modern Digital and Analog Communication Systems, 4th ed. (envelope/coherent detection, image-frequency rejection); J. G. Proakis and D. G. Manolakis, Digital Signal Processing, 4th ed. (z-transforms, difference equations, BIBO stability).