How to generate white noise with certain power spectral density using wgn function?

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Wei Zhang
Wei Zhang on 11 Dec 2021
wgn function has three arguments: wgn(m,n,power)
If I want to generate a white noise time series with power spectral density S0, whould I set "power" equal to S0?
Many thanks

Answers (1)

Ashutosh Singh Baghel
Ashutosh Singh Baghel on 20 Dec 2021
Edited: Ashutosh Singh Baghel on 20 Dec 2021
Hi Wei,
I understand you wish to generate white noise samples in volts. This can be done using 'wgn' function.
m = 1000; % Number of white Gaussian noise samples
n = 1; % Number of channels desired
power = -6; % Power of noise samples
wgnoise = wgn(m,n,power);
var(wgnoise)
ans = 0.2573
Power of noise samples, is specified as a scalar. The default unit for power is dBW.
Please refer to MATLAB Documentation link of 'wgn(m,n,power)' function.

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