Robust Concentric Circular Antenna Array With Variable Loading Technique in the Presence of Look Direction Disparity

Reza, Md. Farhamdur; Hossain, Md. Selim

doi:10.2528/pierm17030809

Cited by 13 publications

(10 citation statements)

References 27 publications

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“…The proposed CHAA exploiting VDL technique is self-acting, and the value of loading level relies on SOI power level, noise power level, norm of steering vector considering with DOA error and without DOA error, and steering vector distortion bound. Correlation matrix in VDL method because of DOA mismatch can be computed by [7],…”

Section: Vdl Based Robust Beamformingmentioning

confidence: 99%

“…Interelement spacing, signal propagation speed, and signal frequency are half-wavelength, 3 × 10 8 m/s, and 0.3 GHz, respectively. Figure 4 exhibits the power pattern comparison between the proposed MVDR based CHAA and MVDR based CCAA [7] with the same number of elements (19) where the beamwidth of CHAA is significantly narrower than the beamwidth of CCAA. For example, the HPBWs of proposed CHAA and existing CCAA are 35.88 • and 48.19 • , respectively.…”

Section: Performance Analysismentioning

confidence: 99%

“…Linear [4,5] and circular [6,7] structures are used for smart antennas. Linear antenna array produces the narrowest beamwidth and higher dircetivity, but the shortcoming of this array is that it cannot scan over 360 • azimuth angle, and the dimension of linear antenna array becomes large when a large number of antenna elements are incorporated in this array.…”

Section: Introductionmentioning

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%

See 3 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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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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Section: Vdl Based Robust Beamformingmentioning

confidence: 99%

Section: Performance Analysismentioning

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

Self Cite

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“…The performance of a MVDR beamformer degrades if there is any difference between steering direction and actual signal direction [13][14][15][16][17][18]. To improve the performance of the beamformer, different loading techniques are used in [19][20][21][22][23][24][25]. This paper also proposes a novel technique named tapered robust MVDR CECCAA beamformer.…”

Section: International Journal Of Antennas and Propagationmentioning

confidence: 99%

Robust Centered Element Concentric Circular Antenna Array with Low Side Lobe Using Variable Loading and Tapering Windows in the Presence of Array Imperfections

Reza

Hossain

Rashid

2017

International Journal of Antennas and Propagation

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This paper presents centered element concentric circular antenna array (CECCAA) using variable diagonal loading (VDL) technique and different filtering windows. The different filtering windows are modified to apply in the CECCAA system. The modified novel technique not only is able to reduce the side lobe level (SLL) but also has the ability to detect and highly attenuate the directional interferences. However, the performance of CECCAA system is degraded in the presence of array imperfections. This performance degradation problem due to array imperfections can be improved by using robust techniques. The proposed technique is also robust against array imperfections and improves the performance. Moreover, the performance of the proposed structure is better than a concentric circular antenna array (CCAA). Several examples are presented to analyze the performance of proposed beamformer by using different tapering windows.

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Performance Analysis of Uniform Concentric Circular Antenna Array Beamformer Using Different DOA Estimation Technique

Sarkar

Reza

2018

2018 4th International Conference on Electrical Engineering and Information &Amp; Communication Technology (iCEEiCT)

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Robust Concentric Circular Antenna Array With Variable Loading Technique in the Presence of Look Direction Disparity

Cited by 13 publications

References 27 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

Robust Centered Element Concentric Circular Antenna Array with Low Side Lobe Using Variable Loading and Tapering Windows in the Presence of Array Imperfections

Performance Analysis of Uniform Concentric Circular Antenna Array Beamformer Using Different DOA Estimation Technique

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