Dear Researchers,

I have a model in which I extracted Signal Subspace (SS),Qs, from the measured Covariance matrix. Now I wan to extract the noise subspace (of course without EVD decomposition method). my question is: If I project the null space of Qs as follow:

Projected_Qs=eye(M) - Qs x inv(Qs' x Qs) x Qs'

Is that mean I get noise subspace ,Qn, please? in other word, is Projected_Qs=Qn?

I appreciate your answers.

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