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polar_NRZ_I.m
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polar_NRZ_I.m
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clc; %clear command line
clear all; %clear variables
close all; %clear figures
bits = [1 0 1 0 0 0 1 0 1 1 0 1 0 0];
%Modulation :
bitRate = 1;
voltage = 5;
samplingRate = 1000;
samplingTime = 1/samplingRate;
endTime = length(bits)/bitRate;
time = 0:samplingTime:endTime;
disp(time);
sign = 1;
index = 1;
modulation = [];
if(bits(index) == 1)
sign = -1*sign;
end
for i = 1:length(time)
modulation(i) = sign * voltage;
if(time(i)*bitRate>= index)
index = index+1;
if(index <= length(bits) && bits(index) == 1)
sign = -1*sign;
end
end
end
plot(time,modulation,'LineWidth',3);
axis([0 endTime -voltage-5 voltage+5]);
grid on;
%Demodulation :
index = 1;
value = voltage;
demodulation = [];
for i = 1:length(modulation)
if(modulation(i) == value)
demodulation(index) = 0;
else
demodulation(index) = 1;
end
if(time(i)*bitRate >= index)
index = index+1;
value = modulation(i);
end
end
disp(demodulation);
% 1 = state change ( stat at -5 ) ; 0 = no change