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Quiz03-Sec1-sol - EE380 Communication Systems Spring...

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EE380 – Communication Systems Section 1 – SET 1 Spring 2010-2011 Quiz Number 3 – Solutions Closed Book; Closed Notes Time Given=8 minutes (Apr 28, 2011) “IcertifythatIhaveneitherreceived norgivenunpermitted aidonthisexaminationand that I have reported all such incidents observed by me in which unpermitted aid is given.” Signature Name Student ID Problem 1: [4pts] A signal m ( t ) has a spectrum that is non-zero over the range [0, 10KHz], i.e., the signal bandwidth is 10KHz. A carrier at 10MHz is modulated by m ( t ) to generate a modulated signal x c ( t ). (a) [1pts] If the modulation is DSB-SC, over what frequency range is the spectrum of x c ( t ) non-zero? Only specify positive frequency range. Solution: [9.99MHz, 10.01MHz] (b) [1pts] If the modulation is AM, over what frequency range is the spectrum of x c ( t ) non-zero? Only specify positive frequency range. Solution: [9.99MHz, 10.01MHz] (c) [1pts] If the modulation is USB (upper single sideband), over what frequency range is the spectrum of x c ( t ) non-zero? Only specify positive frequency range.
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