Optimal design of FIR beamformer with frequency invariant patterns

Yan, Shefeng

doi:10.1016/j.apacoust.2005.09.008

Cited by 45 publications

(22 citation statements)

References 31 publications

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“…We assume that the needed presteering delay (unit in taps) that aligns the desired signal arrived from φ 0 (the pointing direction of the beamformer) for channel n is ζ n (φ 0 ). The array weight can be thus rewritten as [17] w n f j = e −i2π fj int[ζn(φ0)−(L−1)/2]Ts…”

Section: Time-domain Beamformermentioning

confidence: 99%

Broadband Beamspace DOA Estimation: Frequency-Domain and Time-Domain Processing Approaches

Yan

2006

EURASIP J. Adv. Signal Process.

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Frequency-domain and time-domain processing approaches to direction-of-arrival (DOA) estimation for multiple broadband far field signals using beamspace preprocessing structures are proposed. The technique is based on constant mainlobe response beamforming. A set of frequency-domain and time-domain beamformers with constant (frequency independent) mainlobe response and controlled sidelobes is designed to cover the spatial sector of interest using optimal array pattern synthesis technique and optimal FIR filters design technique. These techniques lead the resulting beampatterns higher mainlobe approximation accuracy and yet lower sidelobes. For the scenario of strong out-of-sector interfering sources, our approaches can form nulls or notches in the direction of them and yet guarantee that the mainlobe response of the beamformers is constant over the design band. Numerical results show that the proposed time-domain processing DOA estimator has comparable performance with the proposed frequency-domain processing method, and that both of them are able to resolve correlated source signals and provide better resolution at lower signal-to-noise ratio (SNR) and lower root-mean-square error (RMSE) of the DOA estimate compared with the existing method. Our beamspace DOA estimators maintain good DOA estimation and spatial resolution capability in the scenario of strong out-of-sector interfering sources.

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Section: Time-domain Beamformermentioning

confidence: 99%

Broadband Beamspace DOA Estimation: Frequency-Domain and Time-Domain Processing Approaches

Yan

2006

EURASIP J. Adv. Signal Process.

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“…Several methods of designing a CMR beamformer have been proposed, [14][15][16][17][18][19][20][21] among them some were FIR implementation. [14][15][16]20,21 In Ref.…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16]20,21 In Ref. 14, an analog technique based on approximating an ideal continuous aperture using the scale-frequency relationship of the array aperture was presented.…”

Section: Introductionmentioning

confidence: 99%

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Optimal array pattern synthesis for broadband arrays

Yan

Hou

2007

The Journal of the Acoustical Society of America

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103

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Broadband beamformers with constant mainlobe response over the frequency of interest are desirable in many applications including underwater acoustics, ultrasonics, acoustic imaging and communications, and so on. Solutions to this problem have been presented for specific array geometry often requiring a larger number of sensors. And the array pattern synthesis error minimization is employed for the whole field of view, which leads to suboptimal designs. In this paper, a broadband array pattern synthesis approach to designing time-domain constant mainlobe response beamformer is proposed. By imposing constraints both on the mainlobe spatial response variation over frequency and on the sidelobes of the beamformer, several optimization criteria are presented and the corresponding convex second-order cone programming implementations are given. In this approach, no preliminary desired beampattern is required and the beam responses variation minimization is employed only in the mainlobe region and not in the sidelobe regions, which improves the beamformer mainlobe synthesis accuracy. Equally, one can obtain lower sidelobes at the same mainlobe synthesis accuracy. This approach is applicable to arrays with arbitrary geometry. Simulation and experimental results are presented to illustrate the effectiveness of this approach. Performance comparisons of the proposed beamformers and the existing beamformer are also provided.

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“…The beampattern is a function of both direction and frequency. The two-dimensional Fourier transform [62], weighted Chebyshev approximation [63], eigenfilters [64], second-order cone programming (SOCP) [65][66][67][68], vector space projections [69], and some other approaches [70][71][72], have been proposed to synthesize broadband beampatterns. References [73,74] are examples designing broadband beamformers with specified nulls.…”

Section: Iv) Broadband Pattern Synthesismentioning

confidence: 99%

Array signal processing techniques for broadband beamforming

Huang¹

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Optimal design of FIR beamformer with frequency invariant patterns

Cited by 45 publications

References 31 publications

Broadband Beamspace DOA Estimation: Frequency-Domain and Time-Domain Processing Approaches

Broadband Beamspace DOA Estimation: Frequency-Domain and Time-Domain Processing Approaches

Optimal array pattern synthesis for broadband arrays

Array signal processing techniques for broadband beamforming

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