EEE206 EEE206 1 TURN OVER Data Provided: Tables of Bessel FunctionsThe University of Sheffield DEPARTMENT OF ELECTRONIC AND ELECTRICAL ENGINEERING Spring Semester 2004-2005 (2 hours) Communication Systems 2 Answer THREEquestions. 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. Why are the processes of modulation and demodulation widely used in communication systems? (3)b. Figure 1 shows a basic circuit for producing an AM-DSB-CP signal. Figure 1 (i) Explain how the circuit works and sketch the waveforms at points A, B and C if the message is a simple sine wave. A BC
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