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Forward/backward spatial smoothing techniques for coherent signal identification

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2 Author(s)
S. U. Pillai ; Dept. of Electr. Eng. & Comput. Sci., Polytech. Univ., Brooklyn, NY, USA ; B. H. Kwon

A spatial smoothing scheme is further investigated in the context of coherent signal classification. It is shown that by making use of a set of forward and complex conjugated backward subarrays simultaneously, it is always possible to estimate any K directions of arrival using at most 3K/2 sensor elements. This is achieved by creating a smoothed array output covariance matrix that is structurally identical to a covariance matrix in some noncoherent situation. By incorporating eigenstructure-based techniques on this smoothed covariance matrix, it then becomes possible to correctly identify all directions of arrival irrespective of their correlation.<>

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IEEE Transactions on Acoustics, Speech, and Signal Processing  (Volume:37 ,  Issue: 1 )