Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Paper format. Professional Engineers of Ontario annual examinations, December 2015, 07-Elec-B3 Digital Communication Systems — 3 hours, closed book, a PEO-approved non-programmable calculator permitted. Five questions of 25 marks are printed; any four constitute a complete paper worth 100 marks, and only the first four appearing in the answer book are marked. Marks are shown in the left margin. Note 1 on the cover page urges the candidate to submit a clear statement of any assumptions made. All five questions are solved below, because the set is intended as a study resource rather than a sitting.
Reference texts. J. G. Proakis and M. Salehi, Communication Systems Engineering, 2nd ed. (link budgets, source coding, block codes, PCM); S. Haykin and M. Moher, Communication Systems, 5th ed.; B. Sklar, Digital Communications: Fundamentals and Applications, 2nd ed. (spread spectrum, ch. 12); T. M. Cover and J. A. Thomas, Elements of Information Theory, 2nd ed. (entropy, Huffman and Shannon–Fano–Elias codes); S. Lin and D. J. Costello, Error Control Coding, 2nd ed. (linear block codes); A. V. Oppenheim and R. W. Schafer, Discrete-Time Signal Processing, 3rd ed. (sampling, quantization); T. S. Rappaport, Wireless Communications: Principles and Practice, 2nd ed. In the Canadian frame, licence-exempt spread-spectrum equipment is governed by ISED RSS-247 and spectrum allocations by the Canadian Table of Frequency Allocations.
