Reweighted Regularized Sparse Recovery for DOA Estimation With Unknown Mutual Coupling

Wang, Xianpeng; Meng, Dandan; Huang, Mengxing; Wan, Liantian

doi:10.1109/lcomm.2018.2884457

Cited by 51 publications

(42 citation statements)

References 16 publications

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“…Ideally, arbitrarily large rejections can be achieved just by implementing a strong coupling coefficient or a sufficiently long filter. In practice, achievable rejection saturates beyond a certain filter length . To achieve the theoretical rejection level, partial reflections in all periods of the filter have to interfere constructively.…”

Section: Resultsmentioning

confidence: 99%

“…A myriad of optical filters has been reported for the silicon photonics technology, including Bragg grating filters, cascaded micro‐resonators, and Mach–Zehnder interferometers (MZI) . Although theoretical designs can achieve remarkably large rejection levels, most practical implementations are limited to the 30–60 dB range . The main limiting factor to the achievable on‐chip optical rejection currently lies in fabrication imperfections.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coherency‐Broken Bragg Filters: Overcoming On‐Chip Rejection Limitations

Oser

Mazeas

Roux

et al. 2019

Laser & Photonics Reviews

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Selective optical filters with high rejection levels are of fundamental importance for a wide range of advanced photonic circuits. However, the implementation of high-rejection on-chip optical filters is seriously hampered by phase errors arising from fabrication imperfections. Due to coherent interactions, unwanted phase-shifts result in detrimental destructive interferences that distort the filter response, whatever the chosen strategy (resonators, interferometers, Bragg filters, etc.). State-of-the-art high-rejection filters partially circumvent the sensitivity to phase errors by means of active tuning, complicating device fabrication and operation. Here, a new approach based on coherency-broken Bragg filters is proposed to overcome this fundamental limitation. Non-coherent interaction among modal-engineered waveguide Bragg gratings separated by single-mode waveguides is exploited to yield effective cascading, even in the presence of phase errors. This technologically independent approach allows seamless combination of filter stages with moderate performance free of active control, providing a dramatic increase of on-chip rejection. Based on this concept, on-chip non-coherent cascading of Si Bragg filters is experimentally demonstrated, achieving a light rejection exceeding 80 dB, the largest value reported for an all-passive silicon filter.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coherency‐Broken Bragg Filters: Overcoming On‐Chip Rejection Limitations

Oser

Mazeas

Roux

et al. 2019

Laser & Photonics Reviews

View full text Add to dashboard Cite

show abstract

“…Inspired by the method in [5], an effective block sparse representation model is considered for DOA estimation in the presence of unknown MC for ULA by [11]. In order to further exploit the block sparsity of the signal, a reweighted ℓ 1 -norm method [12] is introduced to solve the block sparse DOA estimation with MC, where the weighted matrix is determined by a MUSIC-like spectrum. In [13], a sparsity-inducing method over covariance matrix is proposed, which provides larger degrees of freedom and array aperture.…”

Section: Introductionmentioning

confidence: 99%

“…In this letter, a novel block sparse reconstruction method is devised and analyzed for DOA estimation with unknown MC, which first formulates a modified array manifold matrix without MC compensation, and establishes block sparse reconstruction model which differs from the models in [11], [12]. Then a family of block smoothed ℓ 0 approximation functions are utilized to exploit the block sparsity.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Block Sparse Reconstruction Method for DOA Estimation With Unknown Mutual Coupling

Zhang

Jiang

et al. 2019

IEEE Commun. Lett.

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In this letter, we consider the direction-of-arrival (DOA) estimation in the presence of unknown mutual coupling in application to uniform linear arrays (ULAs). A novel method is proposed that treats the DOA estimation as a block sparse signal reconstruction problem with a modified array manifold matrix which utilizes the information of entire array output. A block smoothed ℓ 0 norm approximation technique is introduced to solve the problem. Finally, an iterative proximal algorithm is proposed. Simulation results are presented that show the superiority of the proposed method against other known techniques.Index Terms-Direction-of-arrival (DOA), mutual coupling, block sparse reconstruction, block smoothed ℓ 0 (BSL0).

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Direction-Finding and Polarization Estimation with Spread Orthogonal Loop and Dipole Arrays

Tang

Shu

et al. 2021

Circuits Syst Signal Process

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Reweighted Regularized Sparse Recovery for DOA Estimation With Unknown Mutual Coupling

Cited by 51 publications

References 16 publications

Coherency‐Broken Bragg Filters: Overcoming On‐Chip Rejection Limitations

Coherency‐Broken Bragg Filters: Overcoming On‐Chip Rejection Limitations

A Novel Block Sparse Reconstruction Method for DOA Estimation With Unknown Mutual Coupling

Direction-Finding and Polarization Estimation with Spread Orthogonal Loop and Dipole Arrays

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