How to add AWGN noise using randn function?

6 次查看（过去 30 天）
Afaq Ahmad
Afaq Ahmad 2021-1-13
回答： Aastha 2025-6-12
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)?

请先登录，再回答此问题。

回答（1 个）

Aastha
Aastha 2025-6-12
Hi @Afaq Ahmad,
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:
https://www.mathworks.com/help/matlab/ref/double.randn.html
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!

类别

在 Help Center 和 File Exchange 中查找有关 Propagation and Channel Models 的更多信息

标签

产品


版本

R2014a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by