An adaptive wideband beamforming structure with combined subband decomposition

An adaptive wideband beamforming structure is proposed with combined spatial/temporal subband decomposition. The received signals are first processed by a transformation matrix, and then split into a series of subbands, where independent beamformers can be operated. A special property is that some of the lower subbands can be discarded without affecting its performance, which leads to a system with a lower computational complexity and higher convergence speed. Index Terms--Adaptive arrays, array signal processing, linear arrays.