Adding noise signal to data encoding

Question

I am following this example code. I want to add a random noise signal with 2 values per bit. How can I solve that?

The Code looks like:

bits =[1,0,1,0,1,0,1,0];
bitrate = 1; % bits per second

figure;
[t,s] = pnrz(bits,bitrate);
plot(t,s,'LineWidth',3);
axis([0 t(end) -1.1 1.1])
grid on;
title(['Polar NRZ: [' num2str(bits) ']']);
T = length(bits)/bitrate; % full time of bit sequence
n = 200;
N = n*length(bits);
dt = T/N;
t = 0:dt:T;
x = zeros(1,length(t)); % output signal
for i = 0:length(bits)-1
    if bits(i+1) == 1
        x(i*n+1:(i+1)*n) = 1;
    else
        x(i*n+1:(i+1)*n) = -1;
    end
end

The noise, you are adding, to which variable ?

user813853
– user813853

2015-07-17 10:45:50 +00:00
Commented Jul 17, 2015 at 10:45 — user813853
– user813853, Commented Jul 17, 2015 at 10:45

Community · Accepted Answer · 2017-05-23 11:58:16Z

0

if I well understood your question, you can use the random function :

random1or0 = randi(2)-1;

So randi will generate a random integer (in uniformly distributed manner) between 1 and 2, then subtracts 1 to get 0 or 1.

You can relate to this question Generate a random number in a certain range in MATLAB for more details about random numbers in matlab.

edited May 23, 2017 at 11:58

CommunityBot

11 silver badge

answered Jul 9, 2015 at 14:15

user813853

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4 Comments

Sanap Over a year ago

yes it's right, but i want to know how to add 2 values per bit as noise signal?

user813853 Over a year ago

x(i*n+1:(i+1)*n) = (1+ random1or0) % 2; and that's it. a noise is just random 0 or 1 added to the output, but if you want more details you have to read about noise in signals ...

user813853 Over a year ago

x(i*n+1:(i+1)*n) = (1+ random1or0) % 2; is another solution @Sanap

user813853 Over a year ago

@Sanap does this answer your question ? can you please explain what you mean by how to add 2 values per bit ? to add to which variable ?

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