Performance investigation of robust concentric circular antenna array beamformer in the presence of look direction disparity

Reza, Md. Farhamdur; Hossain, Md. Saddam

doi:10.1016/j.aeue.2017.07.033

Cited by 11 publications

(6 citation statements)

References 20 publications

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“…In FDL, to reduce the signal cancelation because of DOA error, a fixed value is added to the diagonal of the correlation matrix. Correlation matrix in FDL technique becomes [14],…”

Section: Fdl Based Robust Beamformingmentioning

confidence: 99%

“…Optimal diagonal loading (ODL) is one of the robust techniques which is used to enhance the robustness of beamformer in the appearance of DOA mismatch [14,34]. Correlation matrix in ODL method considering DOA error is given by [14]…”

Section: Odl Based Robust Beamformingmentioning

confidence: 99%

“…Diagonal loading (DL) technique is a notable one discussed in [8][9][10][11][12][13]. ODL [14] and VDL [7,15] techniques have been applied on CCAA to make the array system robust whose performance is better than a linear antenna array. ODL robust technique has been exploited in hexagonal antenna array in [16].…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this paper is to enhance the directivity and robustness in appearance of DOA error and minimize SLL. In this paper, a CHAA using VDL technique is presented in the presence of DOA error which delivers better performance than the existing CHAAs [16] and CCAA [14]. Moreover, some conventional window functions have been modified and applied to CHAA to taper the SLL.…”

Section: Introductionmentioning

confidence: 99%

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Variable Diagonal Loading Based Robust Concentric Hexagonal Antenna Array With Low Side Lobe Level Using Tapering Windows

Ali¹,

Hossain²,

Reza³

2020

PIER C

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In this paper, the performance of a concentric hexagonal antenna array (CHAA) is investigated with the exploitation of a robust variable diagonal loading (VDL) technique in the presence of direction of arrival (DOA) mismatch. The performance of minimum variance distortionless response (MVDR) based CHAA is compared with the performance of existing MVDR based concentric circular antenna arrays (CCAAs), and it is found that the proposed MVDR based CHAA provides 25.54% narrow half-power beamwidth (HPBW) and lower side lobe level than the existing MVDR based CCAA. When DOA mismatch occurs between main beam steering direction and actual signal-of-interest (SOI) direction, the performance of MVDR based CHAA is deteriorated. In the case of DOA mismatch, to ameliorate the performance of CHAA, this paper proposes VDL technique for the CHAA processor and compares the performance of the proposed robust CHAA with the existing robust CHAAs. The proposed VDL based robust CHAA delivers 88.37% and 78.56% higher output power for 2 • DOA mismatch than existing fixed diagonal loading (FDL) and optimal diagonal loading (ODL) based CHAAs, respectively. Several tapering window functions are proposed to reduce the side lobe level of CHAA. Performance of the proposed beamformer is analyzed utilizing MATLAB environment in various scenarios.

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“…In FDL, to reduce the signal cancelation because of DOA error, a fixed value is added to the diagonal of the correlation matrix. Correlation matrix in FDL technique becomes [14],…”

Section: Fdl Based Robust Beamformingmentioning

confidence: 99%

Section: Odl Based Robust Beamformingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Variable Diagonal Loading Based Robust Concentric Hexagonal Antenna Array With Low Side Lobe Level Using Tapering Windows

Ali¹,

Hossain²,

Reza³

2020

PIER C

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show abstract

“…In this paper, a beamformer named Linearly arranged Concentric Circular Antenna Array (LCCAA) is proposed to overcome the aforementioned difficulties. The proposed beamformer is compared with the existing beamformer-concentric circular antenna array (CCAA) [33], linear array [34], uniform concentric circular antenna array (UCCAA) [35], centered element concentric circular antenna array (CEC-CAA) [36], uniform centered element concentric circular antenna array (UCECCAA) [36] and uniform linearly arranged concentric circular antenna array (ULCCAA) beamformer where the proposed LCCAA beamformer shows the better performance than others with the conventional technique. However, the conventional technique is unable to peak the rightmost signal and the optimal technique is applied to peak the actual signal and attenuate the interference.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Linearly arranged Concentric Circular Antenna Array with Low Sidelobe Level and Beamwidth Using Robust Tapering Technique.

Rahaman

Reza

Hossain

et al. 2021

Preprint

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In this research, a novel antenna array named Linearly arranged Concentric Circular Antenna Array (LCCAA) is proposed concerning lower beamwidth, lower sidelobe level, sharp ability to detect the false signal, and impressive SINR performance. The performance of the proposed LCCAA beamformer is compared with geometrically identical existing beamformers using the conventional technique where the LCCAA beamformer shows the lowest beamwidth and sidelobe level(SLL) of 12.50°and -15.17 dB in equal element accordingly. However, the performance gets degraded due to looking direction error, and robust techniques- fixed diagonal loading (FDL), optimal diagonal loading (ODL), and variable diagonal loading (VDL) are applied to all the potential arrays to minimize this problem. Furthermore, the LCCAA beamformer is further simulated to reduce the sidelobe applying tapering techniques where the hamming window shows the best performance having 17.097 dB less sidelobe level compared to the uniform window. The proposed structure is also analyzed under a robust tapered (VDL-hamming) method which reduces around 69.92 dB and 48.39 dB more sidelobe level compared to conventional and robust techniques. Analyzing all the performances, it is clear that the proposed LCCAA beamformer is superior and provides the best performance with the proposed robust tapered (VDL-hamming) technique.

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Robust beamforming for non-circular signals in uniform linear arrays with unknown mutual coupling

Meng

Dong

Shi

et al. 2022

Digital Signal Processing

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Performance investigation of robust concentric circular antenna array beamformer in the presence of look direction disparity

Cited by 11 publications

References 20 publications

Variable Diagonal Loading Based Robust Concentric Hexagonal Antenna Array With Low Side Lobe Level Using Tapering Windows

Variable Diagonal Loading Based Robust Concentric Hexagonal Antenna Array With Low Side Lobe Level Using Tapering Windows

Performance Analysis of Linearly arranged Concentric Circular Antenna Array with Low Sidelobe Level and Beamwidth Using Robust Tapering Technique.

Robust beamforming for non-circular signals in uniform linear arrays with unknown mutual coupling

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