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ECE 563 Exam 1 with Solutions

# We want to use this to generate an upper sideband

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Unformatted text preview: of a descrambler system that has x s ( t ) as input and xc ( t ) as output. € € € 3. (22 points) Say that we have a message signal mc (t ) with the Fourier Transform M c ( f ) as shown below. We want to use this to generate an upper sideband transmitted signal xc (t ) having Fourier Transform Xc ( f ) , also as shown below. Xc ( f ) Mc ( f ) −10 f (kHz) f (kHz) −100 −90 10 90 a. (11 points) Suppose that we use a system of the form mc (t ) C/D\$ TS H( F ) # D/C\$ TS 2 cos ( 2π F0 n ) 100 xc ( t ) 1 where = 200 kHz. Complete the design by finding the value of F0 and the DT Ts system’s frequency response H ( F ) . € b. (11 points) Now suppose that xc (t ) is input to the system shown below, where € 1 = 90 kHz. Draw Yr€f ) . ( T2 xc ( t ) C/D\$ D/C\$ T2 € T2 yr (t ) 4. (22 points) Con...
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