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A frequency-invariant beamformer (FIB) that uses a reduced number of adaptive coefficients is described. A beam space extension of a previously proposed uniform linear array FIB is used in the design procedure that is analogous to the frequency-sampling method in filter design. Simulations show similar synthesis performance between the conventional and proposed FIB, with the latter offering reduced complexity in adaptive applications.
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Marciano et al. (2000) studied this question.
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