STFD - What does STFD stand for? The Free Dictionary
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Then, substituting (1) into (3) and taking the expectation, we obtain the STFD matrix 
For the purpose of simplifying the STFD matrix (4) and applying the subspace methods to find DOA, the window length L can be restricted by 
The STFD matrix and the source TFDs matrix in (6) are similar to the spatial covariance matrix and the source covariance matrix.
The shares of the Company are quoted on the Canadian Dealing Network under the trading symbol - STFD