Quiz04-Sec1-sol - EE380 – Communication Systems Section 1...

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Unformatted text preview: EE380 – Communication Systems Section 1 – SET 1 Spring 2010-2011 Quiz Number 4 – Solutions Closed Book; Closed Notes Time Given=5 minutes (Apr 28, 2011) “I certify that I have neither received nor given unpermitted aid on this examination and that I have reported all such incidents observed by me in which unpermitted aid is given.” Signature Name Student ID Problem 1: [4pts] A message signal m ( t ) modulates a 1MHz carrier and the resulting modulated signal is given by 2 cos(2 π × 1 . 1 × 10 6 t ) during a given interval. (a) [2pts] If the modulation is PM (phase modulation) with the constant K p = 2 π × 10 4 as used in class, find an expression for the message signal m ( t ). Solution: Carrier frequency f c = 1 × 10 6 given. Total angle: θ ( t ) = 2 πf c t + K p m ( t ) = 2 π × 1 . 1 × 10 6 t = ⇒ K p m ( t ) = 2 π × . 1 × 10 6 t = 2 π × 10 5 t m ( t ) = 10 t (b) [2pts] If the modulation is FM (frequency modulation) with the constant K f = 2 π × 10 4 as used in class,...
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Quiz04-Sec1-sol - EE380 – Communication Systems Section 1...

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