Single Snapshot 2D-DOA Estimation in Wireless Location System
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Single Snapshot 2D‑DOA Estimation in Wireless Location System Veerendra Dakulagi1 Accepted: 11 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this research paper, we have devised single-snapshot direction-of-arrival (DOA) algorithms for a uniform circular array (UCA) to resolve multiple targets. Estimation of signal parameters via rotational invariance technique (ESPRIT) and the modified multiple signal classification (MUSIC) algorithms are employed for high-resolution estimation of DOAs. Experimental results are shown to validate the efficacy of the proposed methods. Computer simulations prove that the proposed UCA-ESPRIT and the UCA-modified MUSIC algorithms using single snapshot provide the accurate estimation of DOAs but with the reduced computational complexity. The CPU time obtained using an intel i5 processor shows a significant reduction in computation time as compared to the classical methods. Hence the proposed DOA methods using single snapshot for UCA are suitable in wireless location systems when only a few snapshots or, in the worst case, a single snapshot of the antenna array is on hand for the signal estimation. Keywords Antenna array · Direction-of-arrival (DOA) · ESPRIT · MUSIC · UCA
1 Introduction DOA estimation algorithms are widely used in wireless communication applications including radar [1, 2], cellular communication [2] and sonar [3, 4], etc. Most of the research work in literature use a ULA for spectral estimation of desired signals since DOA estimation using a UCA is always a challenging thing [5, 6]. Recently, large scale UCA has been considered as one the most promising methods in array signal processing (e.g., millimeter-wave and massive MIMO communication) [7]. Single snapshot spectrum estimation methods are attractive in the wireless communication application due to the following reasons. 1. The time of computation and execution can be reduced by using a single snapshot. 2. Some added simplifications are possible by the use of a single signal sample. * Veerendra Dakulagi [email protected] 1
Department of Electronics and Communication Engineering, Lincoln University College, 47301 Petaling Jaya, Kuala Lumpur, Malaysia
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3. The reaction speed can be increased instantaneously after measurement without waiting for large snapshots. 4. Frequency interferer may distort many samples which will not contribute to the estimation. 5. Clutter can superpose a few samples. Such samples cannot be used for DOA estimation. Most of the research work [8–12] especially for DOA estimation using a single snapshot uses a uniform linear array (ULA) as an array configuration. However, most of the practical applications require UCAs. The key feature is, UCAs can provide 360° coverage in azimuth and 180° coverage in elevation [13]. DOA estimation using UCAs is an attractive solution antenna array configurations for performance-driven communication systems. Multipath propagation or intentional jamming in mobile c
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