 Everest Executive and Management College

Sitapaila, Kathmandu

Lab Manual

Analog Communication Laboratory

BELX-6th sem

Everest Anatomist and Managing College

Experiment No . you: To generate WAS wave without using matlab integrated function.

1 . Objective: To build AM trend.

2 . Theory: Explain regarding MATLAB

MATLAB can be described as software package pertaining to high performance numerical computation and visualization. It gives you an online environment with hundred of built in function for specialized computation, graphics, and movement. Best of all, additionally, it provide convenient extensibility having its own higher level programming language. The term MATLAB is short for MATrix Clinical.

3. Plan:

clear every

T=1/100;

fm=0. 25;

fc=10;

mt=sin(2*pi*fm*[0: T: 10]);

subplot(3, 1, 1);

plot(mt)

ct=sin(2*pi*fc*[0: T: 10]);

subplot(3, you, 2);

plot(ct)

yt=mt. *ct;

subplot(3, 1, 3);

plot(yt)

4. Program Output

[pic]

5. Concerns

a) What do you mean by вЂ. *' in above program.

b) Explain following MATLAB command story and subwoofer plot.

d) Why modulation is required in communicatioin program.

6. Conversation and Bottom line

Experiment Number 2: To build AM say and storyline it's frequency spectrum applying matlab.

1 . Objective: To create AM influx and bring frequency domain representation.

2 . Theory:

three or more. Program

%setting

fm=20;

fc=500;

vm=1;

vc=1;

%x-axis: Time(second)

t=0: zero. 00001: 0. 099999;

f=0: 1: 9999;

%y-axis Voltage(Volt)

wc=2*pi*fc;

wm=2*pi*fm;

v1=vc+vm*sin(wm*t);

v2=-(vc+vm*sin(wm*t));

vm=vm*sin(wm*t);

vc=vc*sin(wc*t);

vam=(1+sin(wm*t)). *(sin(wc*t));

vf=abs(fft(vam, 10000)/10000);

%plot figure in time domain

figure;

subplot(2, 2, 1);

plot(t, vm);

hold on;

plot(t, v1, 'r'), plot(t, a huge selection of, 'r');

title('Am waveform period domain');

xlabel('time'), ylabel('amplitude');

main grid on;

%Plot figure in consistency domain

%figure;

subplot(2, a couple of, 2);

plot(f*10, vf);

axis([(fc-2*fm) (fc+2*fm) 0 0. 6]);

title('AM waveform frequency domain');

xlabel('frequency'), ylabel('amplitude');

grid on;

%Plot modulating signal

%figure;

subplot(2, 2, 3);

plot(t, vm);

title('AM modulating signal');

xlabel('title'), ylabel('amplitude');

grid upon;

% Plan carrier signal

%figure;

subplot(2, 2, 4);

plot(t, vc);

title('AM jar signal');

xlabel('time'), ylabel('amplitude');

grid on;

clear;

4. Software Output

[pic]

5. Issue

a) So why frequency website analysis is important in electric and communication system?

b) Write the equation for WAS wave.

six. Discussion and Conclusion...

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