adding white noise on a received signal

[yannoush]

hello

I have created a pulse signal (transmitted and received), and I want to add a white noise with a variance of 1 to the received signal, but I don't know how to do this. if someone can help me?

thanks

 

[GregLocock]

I'm too rusty on matlab to help directly, but here is how to generate good quality white noise, or indeed, any other shaped spectrum.

Create a 2^n long array for the modulus, and shape this to the desired profile against frequency

Create an array for phase, and fill it with random numbers between 0 and 2 pi

Do an IFFT of this data, to give a real time series. This is a time history of statistically valid Gaussian white noise.





Cheers

Greg Locock