One of the simplest filters is weighted delay and sum beamformer. The output is the average of the linear combination of delayed signals. In other words, the beamformer output is formed by averaging weighted and delayed versions of receiver signals. The delay is chosen such that the passband of beamformer is directed to a specific direction in the space.

Classical estimation theory

This section deals with the estimation of the power spectral density of the multi-dimensional signals. The spectral density function can be defined

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