DOA estimation for uniform circular array without the source number based on beamspace transform and higher-order cumulant |
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| Institution: | 1. Electronics Research Institute, Computers and Systems Department, Cairo, Egypt;2. Al-Azhar University, Computers and Systems Department, Cairo, Egypt;1. Department of CSE, United Institute of Technology, Coimbatore, India;2. Department of EIE, Bannari Amman Institute of Technology, Sathyamangalam, India |
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| Abstract: | Fourth-order cumulant is one of most widely used high-order cumulant for direction of arrival (DOA) estimation due to its ability of expanding the virtual array aperture as well as suppressing Gaussian noise. To address the two-dimensional (2D) DOA estimation problem, we propose a modified MUSIC scheme for uniform circular array (UCA) in this paper. Firstly, the fourth-order cumulant of UCA is considered to construct a new propagator, resulting in the elimination of a priori knowledge of the number of signals. Secondly, the UCA is transformed by beamspace transformation, reducing the time computational complexity of the algorithm since the two-dimensional grid search and singular value decomposition are avoided. And finally a low-rank recovery algorithm is adopted to improve the accuracy regarding the limited snapshots scenario. The numerical simulations validate the superiority of the proposed method. |
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| Keywords: | DOA estimation Uniform circular array Fourth-order cumulant Beamspace transform Source number |
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