FL2008EE757H3 - c t) y(t) LO Cos( c t ) LPF d(t) 2. The...

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UNIVERSITY OF NEW HAMPSHIRE DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING ECE757 - Commmunication Systems FALL 2008 DUE DATE: Friday 3 October 2008 Text Reading Chapter 8: Sections: 8.1, 8.2, 8.3, 8.4 (already assigned) Text Problems: 8.1 -7, 8.1-8, 8.2-3, 8.2-6, 8.3-1, 8.3-6, 8.4-8 Additional Problems not in Text: 1. Verify that the message signal m(t) is recovered from a modulated DSB signal by first multiplying it by a local sinusoidal carrier and then passing the resultant signal through a low-pass filter, as shown below in both the a) time domain, and b) the frequency domain. x DSB_SC (t) = m(t)Cos(
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Unformatted text preview: c t) y(t) LO Cos( c t ) LPF d(t) 2. The following equation describes an Amplitude Modulation (AM) signal. You are to write a Matlab program that will this function and then vary the following parameters ( , A c , tone , and c ) to allow you to explore the various effects that they have in the time domain. (email me your matlab code) ( ) ( ) ( ) ( ) ( ) ( ) AM LC c c c c tone x t m t A C o s t A C o s m t Cos t t = + = 3. Modify your code and demonstrate what occurs in the Frequency Domain. Explain your results. (email me your matlab code)...
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