Why is my Gaussian Noise Generator block in the Communications Blockset unable to output random values when my signal is frame-based?

I have a model which has a Gaussian Noise Generator as a source. However, I noticed that if the signal is frame-based, the output of the first frame is not Gaussian and it does not have values indicated by the given "Mean" and "Variance" parameters.

Answer 1

[MathWorks Support Team]

This bug has been fixed for Release 14 (R14). For previous releases, please read below for any possible workarounds:

This has been verified as a bug in the Communications Blockset in the way that the Gaussian Noise Generator handles the first frame of its output.

Currently, to work around this issue, try substituting the DSP Random Number block for the Gaussian Noise Generator block. Change the parameters "Source Type" to Gaussian and "Repeatability" to Specify seed.