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Closed-Form Algorithm for 3-D Near-Field OFDM Signal Localization under Uniform Circular Array

Due to its widespread application in communications, radar, etc., the orthogonal frequency division multiplexing (OFDM) signal has become increasingly urgent in the field of localization. Under uniform circular array (UCA) and near-field conditions, this paper presents a closed-form algorithm based...

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Detalles Bibliográficos
Autores principales: Su, Xiaolong, Liu, Zhen, Chen, Xin, Wei, Xizhang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5795880/
https://www.ncbi.nlm.nih.gov/pubmed/29342905
http://dx.doi.org/10.3390/s18010226
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author Su, Xiaolong
Liu, Zhen
Chen, Xin
Wei, Xizhang
author_facet Su, Xiaolong
Liu, Zhen
Chen, Xin
Wei, Xizhang
author_sort Su, Xiaolong
collection PubMed
description Due to its widespread application in communications, radar, etc., the orthogonal frequency division multiplexing (OFDM) signal has become increasingly urgent in the field of localization. Under uniform circular array (UCA) and near-field conditions, this paper presents a closed-form algorithm based on phase difference for estimating the three-dimensional (3-D) location (azimuth angle, elevation angle, and range) of the OFDM signal. In the algorithm, considering that it is difficult to distinguish the frequency of the OFDM signal’s subcarriers and the phase-based method is always affected by errors of the frequency estimation, this paper employs sparse representation (SR) to obtain the super-resolution frequencies and the corresponding phases of subcarriers. Further, as the phase differences of the adjacent sensors including azimuth angle, elevation angle and range parameters can be expressed as indefinite equations, the near-field OFDM signal’s 3-D location is obtained by employing the least square method, where the phase differences are based on the average of the estimated subcarriers. Finally, the performance of the proposed algorithm is demonstrated by several simulations.
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spelling pubmed-57958802018-02-13 Closed-Form Algorithm for 3-D Near-Field OFDM Signal Localization under Uniform Circular Array Su, Xiaolong Liu, Zhen Chen, Xin Wei, Xizhang Sensors (Basel) Article Due to its widespread application in communications, radar, etc., the orthogonal frequency division multiplexing (OFDM) signal has become increasingly urgent in the field of localization. Under uniform circular array (UCA) and near-field conditions, this paper presents a closed-form algorithm based on phase difference for estimating the three-dimensional (3-D) location (azimuth angle, elevation angle, and range) of the OFDM signal. In the algorithm, considering that it is difficult to distinguish the frequency of the OFDM signal’s subcarriers and the phase-based method is always affected by errors of the frequency estimation, this paper employs sparse representation (SR) to obtain the super-resolution frequencies and the corresponding phases of subcarriers. Further, as the phase differences of the adjacent sensors including azimuth angle, elevation angle and range parameters can be expressed as indefinite equations, the near-field OFDM signal’s 3-D location is obtained by employing the least square method, where the phase differences are based on the average of the estimated subcarriers. Finally, the performance of the proposed algorithm is demonstrated by several simulations. MDPI 2018-01-14 /pmc/articles/PMC5795880/ /pubmed/29342905 http://dx.doi.org/10.3390/s18010226 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Su, Xiaolong
Liu, Zhen
Chen, Xin
Wei, Xizhang
Closed-Form Algorithm for 3-D Near-Field OFDM Signal Localization under Uniform Circular Array
title Closed-Form Algorithm for 3-D Near-Field OFDM Signal Localization under Uniform Circular Array
title_full Closed-Form Algorithm for 3-D Near-Field OFDM Signal Localization under Uniform Circular Array
title_fullStr Closed-Form Algorithm for 3-D Near-Field OFDM Signal Localization under Uniform Circular Array
title_full_unstemmed Closed-Form Algorithm for 3-D Near-Field OFDM Signal Localization under Uniform Circular Array
title_short Closed-Form Algorithm for 3-D Near-Field OFDM Signal Localization under Uniform Circular Array
title_sort closed-form algorithm for 3-d near-field ofdm signal localization under uniform circular array
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5795880/
https://www.ncbi.nlm.nih.gov/pubmed/29342905
http://dx.doi.org/10.3390/s18010226
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