Tutorial3 - 1 Tutorial 3 Amplitude Modulation(AM Principles...

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Principles of Communications 1 Tutorial 3 Amplitude Modulation (AM)
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Principles of Communications 2 Problem 1 (AM-DSB-SC) A modulating signal [with Fourier transform ] is applied to a double-sideband suppressed-carrier ( DSB-SC) modulator operating at a carrier frequency of 200 Hz with a scaling factor of 1 . Sketch the spectrum of the resulting AM-DSB-SC waveform, identifying the upper and lower sidebands , for each of the following cases. (i) (ii) [1 cos( /100)]/ 2 100 ( ) 0 elsewhere f f S f π + < = S ( f ) s ( t ) s ( t ) = cos(100 π t )
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Principles of Communications 3 Problem 2 (AM-DSB-C) 1) Determine the carrier frequency . 2) Draw the spectrum of the transmitted signal. 300 Hz 320 Hz k f k f S ( f ) (Volts/Hz) ( k Hz) -10 10 0 2 Consider an information signal with the spectrum shown below. Suppose we have a channel capable of passing frequencies in the range and we want to transmit the signal across the channel using AM-DSB-C with a scaling factor of 1 . Further suppose that the
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