Wideband Adaptive Beamforming Using Linear Phase Filterbanks

This paper describes the use of linear phase filter banks to perform wideband adaptive beamforming. The application of two types of filter banks is investigated. First, a simple discrete Fourier transform filter bank (DFTFB) is examined, and second a linear phase paraunitary filter bank (LPPUFB) designed using nonlinear optimization techniques is reviewed. For both filter banks, it is shown that computing and applying the optimal beamformer weights independently for different frequency bands yields better performance than a narrowband beamformer.