Add White Gaussian Noise MATLAB

StackOverflow https://stackoverflow.com/questions/19240554

  •  30-06-2022
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Question

When we use following Matlab function

signal=awgn(signal,5,'measured')

How much SNR do we have added to original signal? I mean the SNR is 5 dB? How can I add 20 dB noise to signal by using this command?

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Solution

Like Dan has mentioned in the comments, the second argument is used to set the value of SNR.

However, this is under the assumption that your signal has a power of 0 dBW. In case the signal power is different, you need to increase (or decrease) the value of the snr argument appropriately.

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