DOA Estimation for Highly Correlated and Coherent Multipath Signals with Ultralow SNRs
In a typical multipath propagation environment, there exists a strong direct path signal accompanying with several weak multipath signals. Due to the strong direct path interference and other masking effects, the Direction-of-Arrival (DOA) of a weak multipath signal is hard to be estimated. In this...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | International Journal of Antennas and Propagation |
| Online Access: | http://dx.doi.org/10.1155/2019/2837315 |
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| author | Li Cheng Yang Li Lianying Zou Yong Qin |
| author_facet | Li Cheng Yang Li Lianying Zou Yong Qin |
| author_sort | Li Cheng |
| collection | DOAJ |
| description | In a typical multipath propagation environment, there exists a strong direct path signal accompanying with several weak multipath signals. Due to the strong direct path interference and other masking effects, the Direction-of-Arrival (DOA) of a weak multipath signal is hard to be estimated. In this paper, a novel method is proposed to estimate the DOA of multipath signals with ultralow signal-to-noise ratio (SNR). The main idea is to increase the SNR and signal-to-interference ratio (SIR) of the desired multipath signal in time-delay domain before DOA estimation processing. Firstly, the cross-correlation functions of the direct path signal and the received array signal are calculated. Then, they are combined and constructed to an enhanced array signal. Under certain conditions, the SNR and SIR of the desired signal can be significantly increased. Finally, the DOAs of multipath signals can be estimated by conventional technologies, and the associated time delays can be measured on the DOA-time-shift map. The SNR and SIR gains of the desired signal are analyzed theoretically, and theoretical analysis also indicates that the Cramer–Rao bound can be reduced. Simulation examples are presented to verify the advantages of the proposed method. |
| format | Article |
| id | doaj-art-27ccd08cdab1442fa39fd2e22ebe02f3 |
| institution | Kabale University |
| issn | 1687-5869 1687-5877 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Antennas and Propagation |
| spelling | doaj-art-27ccd08cdab1442fa39fd2e22ebe02f32025-08-20T03:54:42ZengWileyInternational Journal of Antennas and Propagation1687-58691687-58772019-01-01201910.1155/2019/28373152837315DOA Estimation for Highly Correlated and Coherent Multipath Signals with Ultralow SNRsLi Cheng0Yang Li1Lianying Zou2Yong Qin3Hubei Engineering Research Center of Video Image and HD Projection, School of Electrical and Information Engineering, Wuhan Institute of Technology, Wuhan 430205, ChinaHubei Engineering Research Center of Video Image and HD Projection, School of Electrical and Information Engineering, Wuhan Institute of Technology, Wuhan 430205, ChinaHubei Engineering Research Center of Video Image and HD Projection, School of Electrical and Information Engineering, Wuhan Institute of Technology, Wuhan 430205, ChinaSchool of Information Engineering, Nanchang Institute of Technology, Nanchang 330099, ChinaIn a typical multipath propagation environment, there exists a strong direct path signal accompanying with several weak multipath signals. Due to the strong direct path interference and other masking effects, the Direction-of-Arrival (DOA) of a weak multipath signal is hard to be estimated. In this paper, a novel method is proposed to estimate the DOA of multipath signals with ultralow signal-to-noise ratio (SNR). The main idea is to increase the SNR and signal-to-interference ratio (SIR) of the desired multipath signal in time-delay domain before DOA estimation processing. Firstly, the cross-correlation functions of the direct path signal and the received array signal are calculated. Then, they are combined and constructed to an enhanced array signal. Under certain conditions, the SNR and SIR of the desired signal can be significantly increased. Finally, the DOAs of multipath signals can be estimated by conventional technologies, and the associated time delays can be measured on the DOA-time-shift map. The SNR and SIR gains of the desired signal are analyzed theoretically, and theoretical analysis also indicates that the Cramer–Rao bound can be reduced. Simulation examples are presented to verify the advantages of the proposed method.http://dx.doi.org/10.1155/2019/2837315 |
| spellingShingle | Li Cheng Yang Li Lianying Zou Yong Qin DOA Estimation for Highly Correlated and Coherent Multipath Signals with Ultralow SNRs International Journal of Antennas and Propagation |
| title | DOA Estimation for Highly Correlated and Coherent Multipath Signals with Ultralow SNRs |
| title_full | DOA Estimation for Highly Correlated and Coherent Multipath Signals with Ultralow SNRs |
| title_fullStr | DOA Estimation for Highly Correlated and Coherent Multipath Signals with Ultralow SNRs |
| title_full_unstemmed | DOA Estimation for Highly Correlated and Coherent Multipath Signals with Ultralow SNRs |
| title_short | DOA Estimation for Highly Correlated and Coherent Multipath Signals with Ultralow SNRs |
| title_sort | doa estimation for highly correlated and coherent multipath signals with ultralow snrs |
| url | http://dx.doi.org/10.1155/2019/2837315 |
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