homework 4.pdf - 연세대학교 전기전자공학부 Communications Theory Homework Set#4 Assigned Due 23:59 Problem 1(1 Make and draw your own PM

# homework 4.pdf - 연세대학교 전기전자공학부...

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연세대학교 전기전자공학부 Communications Theory Homework Set #4 Assigned: April 15, 2014 Due: April 29, 2014 23:59 Problem 1. (1) Make and draw your own PM modulated signal waveforms that can represent four different kinds of messages. 1 : s 2 : s 3 : s 4 : s (2) Make and draw your own FM modulated signal waveforms that can represent four different kinds of messages. 1 : s 2 : s 3 : s 4 : s

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Problem 2. An FM signal is given as 2 0 co s 2 5 0 t c u t f t m d   where m t is shown below. (1) Sketch the instantaneous frequency as a function of time. (2) Determine the peak-frequency deviation.
Problem 3. An angle-modulated signal as the form 100 cos 2 4 sin 2000 c u t f t t where 10 M H z c f . (1) Determine the average transmitted power.

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Unformatted text preview: (2) Determine the peak-phase deviation. (3) Determine the peak-frequency deviation. (4) Is this an FM or a PM signal? Explain. Problem 4. The message signal   m t into an FM modulator with a peak frequency deviation H z 2 5 v d f  is shown in following figure. Plot the frequency deviation in Hz and the phase-deviation in radians. Problem 5. Sketch FM wave for signal 1 ( ) m t in [Fig. 5-1] and PM wave for 2 ( ) m t in [Fig. 5-2]. The constants are 5 1 0 f k  and p k     . Carrier frequency is 8 1 0 c f  . And then discuss about characteristics of waveform results (How can we distinguish signal with waveform). Fig. 5-1 Fig. 5-2...
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