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Unformatted text preview: ECE 5520, Spring 2010 Mid Term 2 March 18, 2010 Time: 75 minutes Name: Question Points 1 2 3 4 5 6 7 8 9 Total 1 1. (5 points) What is the role of pulseshaping in digital communication systems? 2. (10 points) In digital communication systems what characteristic of a received signal may be used for timing recovery. Explain. 3. (5 points) With your understanding of VSB modulation discussed in the class text, how do you compare the bandwidth efficiency of a VSB system with that of a QAM system? Explain 2 4. (10 points) If p T ( t ) satisfies the set of equations < p T ,k ( t nT b ) , p T ,l ( t mT b ) > = m,n k,l where p T ,k ( t ) = p T ( t ) e j 2 kFt explain how do we use this to construct a multicarrier transmit signal. Also, explain how the the transmitted data symbols can be extracted from the received signal, assuming an ideal channel. 5. (10 points) In OFDM, demodulation (the FFT) is applied to the portion of the each OFDM symbol that contains pure tones. Explain in your own words what does this statement refer to. Explain the role of cyclic prefix in achieving this goal....
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This note was uploaded on 03/18/2011 for the course ECE 5520 taught by Professor Shamir,g during the Spring '08 term at University of Utah.
 Spring '08
 Shamir,G

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