designing noise generator by using matlab

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hitman1988

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hi all

i wanna design a noise generator by using matlab , but not by sumlink method . i wanna design i by using programing method not the blocks
can you help me with that? please
 

hiiii
please help me , the problem is how to calculate the mean and the variance of this system in matlab the code as following
x = 1000;
y = 1000;
h = wgn(x,y,10);
plot(h)
 

Your code:

x = 1000;
y = 1000;
h = wgn(x,y,10);

Generates a 1000x1000 matrix of white gaussian noise in decibels, is that what you want?

If you are after adding a noise signal to signal or collection of data, you can use some like:

t = 0:.001:.25;
x = sin(2*pi*60*t); //60 Hz Sine Wave

y = x + 2*randn(size(t)); //Add random noise


plot(y(1:50))
title('Noisy time domain signal'); //Plot it


s = std; //Standard Deviation

v = var; //Variance

m = mean; //Mean
 

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    hitman1988

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i hope this will help, try "help awgn", which will calculate the signal power and add the desired amount of noise automatically.
 

philoman said:
i hope this will help, try "help awgn", which will calculate the signal power and add the desired amount of noise automatically.
Click to expand...

In his question is how to create a noise function such as the awgn not to use the already created by mathwork
 

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