How to add AWGN noise using randn function?
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I have a discrete time signal which I generated as follows:
I wish to add AWGN noise using randn() function with mean=0 and variance=0, 0.1, 0.5, 1, 1.5 and 3.
The code i have written is:
How can I modify my function to add the noise and later on, demodulate it back into a matrix (as shown in 'w' array)?
回答（1 个）
Aastha
2025-6-12
To add AWGN noise using the "randn" function in MATLAB, you can follow the steps outlined below:
1. The "randn" function in MATLAB generates samples from a standard normal distribution, which has a mean of 0 and a variance of 1.
You may refer to MathWorks documentation of "randn" function for any queries on it:
2. To add AWGN noise with a specified variance "v", you can scale the output of "randn" using the square root of the variance. You may refer to the MATLAB code snippet below to do so:
awgn_noise = sqrt(v).*randn(); % N(0,v)
I hope this helps!
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2021-1-13
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