noise in system generator

Thanks for all... how to find the type of noise present in a circuit in system generator? plz answer me..

[Walter Roberson]

This sounds more like a theoretical question than a MATLAB question.

Is this question perhaps related to Simulink, or perhaps even SimPower ?

[shiyamala]

ok. What is the purpose of adding AWGN channel in communication?

Answer 1

[Wayne King]

I agree with Walter that is not a MATLAB/Simulink question.

Additive WGN is a good noise model because in a wide variety of contexts (not just the one you cite) you find that the signal or image is disturbed (perturbed) by small contributions from a number of disparate (independent) sources. The sum of these contributions results in a Gaussian distribution (see the central limit theorem).

However, there are contexts in which the optimal distribution for modeling is non-Gaussian. This may be because you apply some operation to the signal, or image, which applies the same operation to the noise. This results in a transformed Gaussian RV, which can end up Rayleigh-distributed, or chi-square distributed for example.

Also, the noise may be contributed by one or two dominant sources and we may choose a different distribution to model that noise.

[shiyamala]

ok thank you