how to generate white noise with a specific No

[fanshuo]

how to generate white noise with a specific power spectral density in matlab?
has it anything to do with standard deviation?

Thanks!

 

[ebook123456789]

randn
yes

 

[abaidullah]

offcourse the noise spectral density depends upon the SD.

 

[anoop_ha]

If I understand your Question correctly - you are asking how to generate a noise signal with a specific noise variance [Standard Deviation = sqrt(variance)].

if 'No' is the required noise variance then the following Matlab code will generate a noise stream with variance of No.

noise_stream = sqrt(No/2) * randn(1,length_sequence);

 

[zorro]

Fanshuo,

Using the randn function, the psd is sigma^2/Fsampling, where sigma is the standard deviation of the samples.
Regards

Z