Eee206_2005_exam - EEE206 Data Provided Tables of Bessel Functions The University of Sheffield DEPARTMENT OF ELECTRONIC AND ELECTRICAL ENGINEERING

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EEE206 EEE206 1 TURN OVER Data Provided: Tables of Bessel Functions The University of Sheffield DEPARTMENT OF ELECTRONIC AND ELECTRICAL ENGINEERING Spring Semester 2004-2005 (2 hours) Communication Systems 2 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. 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 B C
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EEE206 EEE206 2 CONTINUED (ii) Sketch the waveform at point C if the message waveform amplitude is very large. Why should this situation be avoided in practice?
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This note was uploaded on 09/25/2008 for the course EEE 206 taught by Professor Langley during the Spring '08 term at University of Sheffield.

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Eee206_2005_exam - EEE206 Data Provided Tables of Bessel Functions The University of Sheffield DEPARTMENT OF ELECTRONIC AND ELECTRICAL ENGINEERING

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