DCS PRACTICAL

AIM: Implementation of pulse code modulation using MATLAB

MATLAB CODE:

A=2;

fc=3;

fs=20;

n=3;

t=0:1/(100*fc):1;

x=A*sin(2*pi*fc*t);

ts=0:1/fs:1;

xs=A*sin(2*pi*fc*ts);

x1=xs+A;

x1=x1/(2*A);

L=(-1+2^n);

x1=L*x1;

xq=round(x1);

r=xq/L;

r=2*A*r;

r=r-A;

y=[];

for i=1:length(xq);

d=dec2bin(xq(i),n);

y=[y double(d)-48];

end

MSE=sum((xs-r).^2)/length(x);

Bitrate=n*fs;

Stepsize=2*A/L;

QNoise=((Stepsize)^2)/12;

subplot(3,1,1);

plot(x)

stem(ts,xs)

subplot(3,1,2);

stem(ts,x1)

stem(ts,xq)

plot(ts,xq)

plot(t,(x+A)*L/(2*A))

subplot(3,1,3);

stairs([y y(length(y))])

axis([0 length(y) -2 2])