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FSK matlab code | FSK modulation matlab source code

This page of MATLAB source code covers FSK matlab code. The output plots and mathematical equations of FSK modulation matlab code are mentioned. FSK modulation stands for Frequency Shift Keying Modulation.

Introduction:
The FSK modulation is a digital modulation technique in which frequency of the carrier signal varies in accordance to the digital binary data (1 or 0). Binary logic-1 represents higher carrier frequency (i.e. 'f1') and logic-0 represents lower carrier frequency (i.e. 'f2') .

Fig.2 FSK Modulation

The figure-1 depicts FSK modulation type. As shown inputs are digital binary data and analog carrier while output is analog FSK modulated signal. FSK modulation offers increased immunity against noise at the cost of larger bandwidth. Also refer difference between ASK, FSK and PSK modulation types>>.

FSK matlab code

clear;
clc;
b = input('Enter the Bit stream \n '); %b = [0 1 0 1 1 1 0];
n = length(b);
t = 0:.01:n;
x = 1:1:(n+1)*100;
for i = 1:n
if (b(i) == 0)
b_p(i) = -1;
else
b_p(i) = 1;
end
for j = i:.1:i+1
bw(x(i*100:(i+1)*100)) = b_p(i);
end
end
bw = bw(100:end);
wo = 2*(2*pi*t);
W = 1*(2*pi*t);
sinHt = sin(wo+W);
sinLt = sin(wo-W);
st = sin(wo+(bw).*W);
subplot(4,1,1)
plot(t,bw)
grid on ; axis([0 n -2 +2])
subplot(4,1,2)
plot(t,sinHt)
grid on ; axis([0 n -2 +2])
subplot(4,1,3)
plot(t,sinLt)
grid on ; axis([0 n -2 +2])
subplot(4,1,4)
plot(t,st)
grid on ; axis([0 n -2 +2])
Fs=1;
figure %pburg(st,10)
periodogram(st)

Input and Output of FSK modulation matlab source code

Run the downloaded FSKModulation.m file after unzipping the folder. and provide input as follows.

After the input is given press "ENTER" key, you will get output matlab image as below.