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New sparse array for non‐circular sources with increased degrees of freedom
2021
Electronics Letters
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In this letter, a new sparse array configuration for non-circular sources is presented, which significantly increases the achievable DOFs and improves the direction-of-arrival estimation performance. ...
Recently, sparse arrays have received considerable attention as they provide larger array aperture and increased degrees-of-freedom (DOFs) compared to uniform linear arrays. ...
Conclusion: We proposed a new array configuration for NCS that achieves more uDOFs and results in a hole-free virtual ULA. ...
doi:10.1049/ell2.12000
fatcat:z3stlo6p3jemxou66mmlunxox4
Analysis and Design of Nonuniform Arrays for Direction Finding
[article]
2018
arXiv
pre-print
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The problem of direction-of-arrival (DOA) estimation using non-uniform arrays is considered. ...
To address a more practical scenario, various methods for DOA estimation using non-uniform arrays in the presence of mutual coupling are presented. ...
Hoorfar, "Mutual coupling effect and
compensation in non-uniform arrays for direction-of-arrival estimation," Digital Signal
Processing Special Issue on Co-prime Sampling and Arrays (in press ...
arXiv:1812.03091v1
fatcat:ygypzgfdi5gwdkdxirieqddhfm
A Novel MIMO Array with Reduced Mutual Coupling and Increased Degrees of Freedom
2021
Mathematical Problems in Engineering
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In this paper, we consider the problem of array design for Multiple-Input Multiple-Output (MIMO) array under the condition of fixed number of physical sensors and mutual coupling. ...
It can obtain the closed form expressions for the physical sensor locations and the degrees of freedom (DOF) from any given number physical sensors. ...
In this paper, we investigate the problem of increasing virtual aperture for the colocated MIMO radar with considering the unknown coupling and propose a novel MIMO array structure. ...
doi:10.1155/2021/3703657
fatcat:o3d5ise3ynfxvj6j6p7kjajs2i
Sparse Automotive MIMO Radar for Super-Resolution Single Snapshot DOA Estimation With Mutual Coupling
2021
IEEE Access
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A novel sparse automotive multiple-input multiple-output (MIMO) radar configuration is proposed for low-complexity super-resolution single snapshot direction-of-arrival (DOA) estimation. ...
A performance comparison between the sparse and conventional MIMO radars with the same number of TX and RX channels confirms a spatial resolution enhancement. ...
Moreover, non-uniform sparse arrays, e.g., minimum redundancy arrays [4] and co-prime arrays [5] , have been proposed to obtain more degrees-of-freedom (DOF). ...
doi:10.1109/access.2021.3122967
fatcat:gyoedte5m5chbnjbqbd3femdiy
k-Level Extended Sparse Array Design for Direction-of-Arrival Estimation
2022
Electronics
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Sparse arrays based on the concept of a sum-difference coarray (SDCA) have increased degrees of freedom and enlarged effective array aperture compared to those only considering a difference coarray. ...
According to the proposed sparse array, the spatial and temporal information of the incident sources are jointly exploited for underdetermined direction-of-arrival estimation. ...
Conflicts of Interest: The authors declare no conflict of interest. Electronics 2022, 11, 3911 ...
doi:10.3390/electronics11233911
fatcat:c2ecytmwxrfedojpsuxy3mksuq
DOA Estimation of a Novel Generalized Nested MIMO Radar with High Degrees of Freedom and Hole-Free Difference Coarray
2021
Mathematical Problems in Engineering
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A novel generalized nested multiple-input multiple-output (MIMO) radar for direction of arrival (DOA) estimation is proposed in this paper. ...
By optimizing the array element configuration, we can obtain the best number of elements of the transmitter and receiver and the attainable degrees of freedom (DOF). ...
Amin, and A. Hoorfar, "Mutual coupling effect and compensation in non-uniform arrays for direction-of-arrival estimation," Digital Signal Processing, vol. 61, pp. 3-14, 2017. ...
doi:10.1155/2021/6622154
fatcat:eqod3jy6xrhgtmh3mwm6iln3ye
Coprime Transformed Nested Array with Enhanced DOFs and Reduced Mutual Coupling Based on the Difference and Sum Coarray
2022
Electronics
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Recently, the concept of the difference and sum coarray has attracted increasing interest in the direction of the arrival estimation field because it can generate enhanced degrees of freedom. ...
Numerical simulations are performed to verify the superiority of the proposed array configuration in terms of the number of DOFs, mutual coupling and direction of arrival (DOA) estimation accuracy. ...
It is clearly seen that all the RMSE values decrease with the increase of SNR, and the proposed CTNA has the lowest RMSE among the seven sparse arrays due to the enhanced DOFs and reduced mutual coupling ...
doi:10.3390/electronics11050823
fatcat:oa3rb4ieybab7dzyujdhy3x6tu
Sparse Linear Antenna Arrays: A Review
[chapter]
2021
Antenna Systems [Working Title]
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Alternately, for a given number of sensors, sparse arrays provide larger apertures and higher degrees of freedom than full arrays (ability to detect more source signals through direction-of-arrival (DOA ...
degrees of freedom (DOFs), sharp angular resolutions and susceptibility to mutual coupling. ...
The number of unique lags in the DCA of a sparse array gives the number of source angles that can be detected during DOA estimation (often known as the degrees of freedom (DOFs) offered by the sparse array ...
doi:10.5772/intechopen.99444
fatcat:kp2egae4rzbuvoibm6xowl6mlq
Sparse linear nested array for active sensing
2017
2017 25th European Signal Processing Conference (EUSIPCO)
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This paper presents a novel closed-form sparse linear array configuration designed for active sensing, called the Concatenated Nested Array (CNA). The key parameters of the CNA are derived. ...
However, finding the array configuration with the smallest number of elements is generally a computationally difficult problem. ...
A sparse array can achieve the same degrees of freedom (DOF) as a filled array with N elements, using only O( √ N ) elements [2] . ...
doi:10.23919/eusipco.2017.8081555
dblp:conf/eusipco/RajamakiK17
fatcat:6linmpetcvfarmjmxr2viselwq
Direction of Arrival Estimation and Robust Adaptive Beamforming with Unfolded Augmented Coprime Array
2020
IEEE Access
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Meanwhile, an increase of the DOFs and improved direction of arrival (DOA) estimation accuracy can be achieved in the presence of mutual coupling. ...
An augmented coprime array systematically employs two sparse subarrays to produce a large-scale difference co-array with attractive merits, such as enhanced degrees of freedom (DOFs) and enlarged array ...
with more antennas than the physical array for increased achievable degrees of freedom (DOFs). ...
doi:10.1109/access.2020.2968956
fatcat:qvj6nnwad5bajjiz5t5hflfeha
A High Resolution Optimum 2D Coprime Planar Array
[article]
2022
arXiv
pre-print
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In this paper, we propose a two-dimensional novel sparse array configurations to estimate both azimuth and elevation angle of arrival of the signal. ...
We explore the non-uniformity of the sparse arrays to enhance the Degrees of Freedom (DOF) by considering the under-determined cases using the concept of the virtual array. ...
Hence to overcome the problem of phase coupled estimation results and to overcome mutual coupling we propose a planar sparse array which is a phased antenna array. ...
arXiv:2206.03994v1
fatcat:f5xun4kfi5bezo7lf67k24qrxu
Two-Dimensional Direction-of-Arrival and Polarization Parameter Estimation Using Parallel Co-prime Polarization Sensitive Array
2019
IEEE Access
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INDEX TERMS Parallel co-prime polarization sensitive array, direction-of-arrival estimation, polarization parameter estimation, polarization sensitive array. 6566 This work is licensed under a Creative ...
The degrees of freedom (DOFs) have been extended due to the co-prime structure, so that the more signals can be detected and the estimation accuracy is improved. ...
ACKNOWLEDGMENT The authors would like to thank the anonymous reviewers for their valuable comments and suggestions. ...
doi:10.1109/access.2019.2957546
fatcat:kyqpbqnpmjefhakezx3j65arxm
Sparse Linear Nested Array For Active Sensing
2018
Zenodo
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Publication in the conference proceedings of EUSIPCO, Kos island, Greece, 2017 ...
A sparse array can achieve the same degrees of freedom (DOF) as a filled array with N elements, using only O( √ N ) elements [2] . ...
Mutual coupling may also be reduced due to the larger interelement distances in sparse arrays [7] , [8] . ...
doi:10.5281/zenodo.1159248
fatcat:udb3khvb2za2xje6mphjrpa6su
A super transformed nested array with reduced mutual coupling for direction of arrival estimation of non‐circular signals
2022
IET radar, sonar & navigation
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K E Y W O R D S degree of freedom, direction of arrival (DOA), mutual coupling, nested arrays, non-circular signal | INTRODUCTION Direction-of-arrival (DOA), as an important aspect of array signal processing ...
the accuracy of direction of arrival (DOA) estimation. ...
Additionally, the proposed array possesses the highest DOA estimation accuracy in the entire ranges of SNR among all the arrays due to its increased DOFs and reduced mutual coupling. ...
doi:10.1049/rsn2.12221
fatcat:mdggioi6urfphdvlmkfvrbkgua
Electromagnetic Vector Sparse Nested Array: Array Structure Design, Off-Grid Parameter Estimation Algorithm
2021
Mathematical Problems in Engineering
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By introducing sparse factor (SF) between every adjacent sensor, the proposed SNA has flexibility of extending the array aperture and reducing the mutual coupling effect. ...
In addition, the improved off-grid orthogonal matching pursuit method obtains joint direction of arrival (DOA) and polarization estimates with a relatively small overcomplete dictionary because this off-grid ...
of signal processing for two-dimensional underwater acoustics coprime array), the fund of Sonar Technology Key Laboratory (range estimation and location technology of passive target via multiple array ...
doi:10.1155/2021/5525221
fatcat:l7envjoy4remfbw24nuhuyf2ny
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