EEN404_09fall_midterm1

EEN404_09fall_midterm1 - EEN 404 - Communication Systems -...

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EEN 404 - Communication Systems - Fall 2010 1 Midterm Exam – October 21, 2010 Closed book, a cheat sheet of letter size is allowed. Please be rigorous and pre- cise, show your work to get points. NAME: STUDENT ID: GOOD LUCK!
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EEN 404 - Communication Systems - Fall 2010 2 Total points: 100 Duration: 75 minutes Problem Score 1 (20pts) 2 (40pts) 3 (40pts) Total
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EEN 404 - Communication Systems - Fall 2010 3 1. (20 points) Assume that a message signal m ( t ) = 4cos(2000 πt ) + 8 cos(4000 πt ) is modulated on a carrier signal 4 cos(20000 πt ). (a) (10 points) If DSB modulation is used, derive an expression for the spectrum of the DSB modulated signal, and sketch the spectrum, giving the weights and frequencies of all components. (b) (10 points) If SSB is used, give an expression for the spectrum of the LSB mod- ulated signal, and sketch the spectrum, giving the weights and frequencies of all components.
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EEN 404 - Communication Systems - Fall 2010 4
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EEN404_09fall_midterm1 - EEN 404 - Communication Systems -...

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