Matlab program for Frequency shift keying.
Matlab code
clc;clear all;close all;
A1=1; %Amplitude of Carrier Wave
fc2=input('Enter the frequency for bit 1 of carrier wave(fc2)= ');
n=input('Enter the no of bit= ');
r=input('Enter the Bite Rate (In bits/sec)= ');
tpb=1/r; %Time duration for per bit
x=rand(1,n); x
for i=1:length(x)
if x(i)>=0.5
B(i)=1;
else
B(i)=0;
end;
end;
B
t1=0; %Temporary variable for time
st=[]; %Variable for store time
Sbs=[]; %Variable for store Bit stream
Sfsk=[]; %Variable for store fsk signal
for i=1:length(B)
if B(i)==0 % When bit is 0 --
t=t1:0.001:t1+tpb; % for time duration tpb behaviour of--
Bs=zeros(1,length(t)); % Bit stream and--
fsk=A1*sin(2*pi*fc1*t); % fsk signal.
else
t=t1:0.001:t1+tpb;
Bs=ones(1,length(t));
fsk=A1*sin(2*pi*fc2*t);
end;
st=[st t]; %storing tpb duration of time
Sbs=[Sbs Bs]; %storing Bit stream in tpb duration
Sfsk=[Sfsk fsk]; %storing fsk signal in tpb duration
t1=t1+tpb; %initial value of next tpb duration for iteration
end;
Sc1=A1*sin(2*pi*fc1*st); %1st Carrier Wave
Sc2=A1*sin(2*pi*fc2*st); %2nd Carrier Wave
subplot(4,1,1);
plot(st,Sbs);
axis([0 tpb*n -2 2])
xlabel('Time');ylabel('Amplitude');title('Bit stream');
subplot(4,1,2);
plot(st,Sc1);
xlabel('Time');ylabel('Amplitude');title('1st Carrier wave');
subplot(4,1,3);
plot(st,Sc2);
xlabel('Time');ylabel('Amplitude');title('2nd Carrier wave');
subplot(4,1,4);
plot(st,Sfsk);
xlabel('Time');ylabel('Amplitude');title('FSK Signal');
Command window
Enter the frequency for bit 0 of carrier wave (fc1) = 5
Enter the frequency for bit 1 of carrier wave (fc2) = 10
Enter the no of bit= 10
Enter the Bite Rate (In bits/sec) = 1
x =
Columns 1 through 9
0.7943 0.3112 0.5285 0.1656 0.6020 0.2630 0.6541 0.6892 0.7482
Column 10
0.4505
B =
1 0 1 0 1 0 1 1 1 0
Figure window
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