Up to now the most literatures consider uniform, single-stage and serial beamforming algorithms such as a linear filtering It is obvious that the linear filtering algorithm is simplest in terms of mathematics among all other filtering algorithms. However, it is wonder the real complexity and efficiency of the linear filtering algorithm is simplest or not. One of the evidence showing that linear processing is not optimum solution in the real world is that filtering algorithms in the nature is not uniform, not single-stage and not serial, for example, neuron in the bio systems.

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