Communication Engineering Programs using scilab

 Communication Engineering Programs using scilab

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7. Create a sin wave and analyze the effect of adding noise to it.

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  Create a sin wave and analyze the effect of adding noise to it. // Create a sin wave and analyze the effect of adding noise to it. subplot( 3 , 1 , 1 ); noisegen (. 5 , 30 , 1 ); x=- 5 :. 01 : 35 ; y= feval (x,Noise); plot(x,y); subplot( 3 , 1 , 2 ); //simple plot B= 5 * sin (x); plot(B); subplot( 3 , 1 , 3 ); C=y.*B; plot(C); // Output Create a sin wave and analyze the effect of adding noise to it.
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3. Program to generate FM Signal and Analyze the effect of increasing modulation index for each modulation technique.

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  Program to generate FM Signal and Analyze the effect of increasing modulation index for each modulation technique. // FM --> Frequency Modulation Ac= 10 ; Am= 10 ; wm= 2 * %pi * 25 ; wc= 2 * %pi * 400 ; t=[ 1 : 0.0002 : 1.1 ]; m=Am* cos (wm*t); c=Ac* cos (wc*t); subplot( 5 , 1 , 1 ); mf= 10 ; Sam1=Ac* cos (wc.*t+(mf)* sin (wm.*t)); plot(t,Sam1, 'red' ); legend( 'm=10' ); mf= 12 ; subplot( 5 , 1 , 2 ); Sam=Ac* cos (wc.*t+mf* sin (wm.*t)); plot(t,Sam , 'blue' ); legend( 'm=12' ); xlabel( 'Time' ); ylabel( 'Amplitude' ); subplot( 5 , 1 , 3 ); mf= 15 ; Sam=Ac* cos (wc.*t+(mf)* sin (wm.*t)); plot(t,Sam, 'black' ); legend( 'm=15' ); subplot( 5 , 1 , 4 ); mf= 20 ; Sam=Ac* cos (wc.*t+(mf+ 20 )* sin (wm.*t)); plot(t,Sam, 'green' ); legend( 'm=20' ); subplot( 5 , 1 , 5 ); mf= 15 ; Sam1=Ac* cos (wc.*t+(mf)* sin (wm.*t)); plot(t,m, 'black' ,t,c, 'green' ,t,Sam1, 'blue' ); legend(...
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4. Simulate BASK or ASK technique using Scilab.

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  Simulate BASK or ASK technique using Scilab. // BASK or ASK --> Binary Amplitude Shift Keying t=[ 0 : 0.02 : 5 * %pi ]; wc= 7 ; A= 0.5 ; Vm= squarewave (t, 30 ); // The second parameter in the squarewave function is the percent of the period in which the // signal is positive. Vc=A/ 2. * cos (wc.*t); Va=( 1 +Vm).*(Vc); subplot( 3 , 1 , 1 ); plot(t,Vm, 'black' ); subplot( 3 , 1 , 2 ); plot(t,Vc, 'black' ); subplot( 3 , 1 , 3 ); plot(t,Va, 'black' ); // Output BASK or ASK --> Binary Amplitude Shift Keying
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