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eee206_2002_exam - Data attached:Table of Bessel Functions...

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Data attached:Table of Bessel Functions EEE206/EEE274 The University of Sheffield DEPARTMENT OF ELECTRONIC AND ELECTRICAL ENGINEERING Spring Semester 2001-2002 (2 hours) EEE206: COMMUNICATION SYSTEMS EEE274: SIGNALS AND COMMUNICATION SYSTEMS Answer THREE questions. No marks will be awarded for solutions to a fourth question. Solutions will be considered in the order that they are presented in the answer book. Trial answers will be ignored if they are clearly crossed out. The numbers given after each section of a question indicate the relative weighting of that section. 1. (a) Explain what is meant by the term "multiplexing" . Give descriptions of three types of multiplexing which are in current use. Illustrate your answer with diagrams where appropriate. (10) (b) A coaxial transmission line passes frequencies in the range 0 to 12 MHz. Determine the maximum number of speech channels, each of 4 kHz bandwidth, that can be transmitted over the transmission line via (i) a time division multiplexed PCM system. Assume that the sampling frequency used is 1.2 times Nyquist, each PCM word contains 6 bits and each
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