22-Elec-B3 Digital Communications Systems: May 2018

Paper format. National Examinations — May 2018, 16-Elec-B3 Digital Communications Systems. Three hours, closed book; a PEO-approved non-programmable calculator is permitted. Five questions of 25 marks each are printed; any four constitute a complete paper worth 100 marks, and only the first four appearing in the answer book are marked. All five questions are solved here, because this set is a study resource rather than a marked script. Note 1 of the cover page invites the candidate to submit a clear statement of any assumption made where a question is open to interpretation — that licence is used explicitly in Question 1.

Reference texts.

• S. Haykin, Communication Systems, 5th ed. — noise figure and equivalent noise temperature, information theory and source coding, sampling and quantisation.
• B. P. Lathi and Z. Ding, Modern Digital and Analog Communication Systems, 4th ed. — PCM, spread spectrum, error-control coding, link power budgets.
• B. Sklar, Digital Communications: Fundamentals and Applications, 2nd ed. — communications link analysis, convolutional coding and the Viterbi algorithm, spread-spectrum techniques.
• J. G. Proakis and D. G. Manolakis, Digital Signal Processing: Principles, Algorithms and Applications, 4th ed. — sampling theorem, aliasing, quantisation error.