Multirate systems and filter banks
Multirate systems and filter banks
Multirate Digital Signal Processing
Multirate Digital Signal Processing
Subband array implementations for space-time adaptive processing
EURASIP Journal on Applied Signal Processing
Applications of the SRV constraint in broadband pattern synthesis
Signal Processing
New structures for adaptive filtering in subbands with critical sampling
IEEE Transactions on Signal Processing
Wideband beamspace adaptive array utilizing FIR fan filters formultibeam forming
IEEE Transactions on Signal Processing
Design of Frequency Invariant Beamformers for Broadband Arrays
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
Digital Signal Processing
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The design of frequency invariant beamformers (FIBs) with off-broadside main beams is studied and it is shown that the required FIR filter length in this case should be much larger than the one with a broadside main beam. To reduce the computational complexity of such a beamformer and also improve its frequency invariant property at lower frequencies, two subband implementations are proposed. In the first one, the fullband array signals are split into subbands by a bank of analysis filters and the corresponding decimated subband signals form a series of subband arrays. Based on this standard subband structure, we then change the sensor spacings of different subband signals so that lower frequency bands have a larger spacing, which leads to a class of FIBs with scaled aperture with further improved performance at lower frequencies.