[1] Zhao Yan, Lin Li, Dong Wen, Wang Hao, et al. A new variable step-size LMS method and its applicationin DOA estimation of OFDMA signals [J]. Journal of Southeast University (English Edition), 2020, 36 (2): 145-151. [doi:10.3969/j.issn.1003-7985.2020.02.004]

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A new variable step-size LMS method and its applicationin DOA estimation of OFDMA signals()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

36

Issue:

2020 2

Page:

145-151

Research Field:

Information and Communication Engineering

Publishing date:

2020-06-20

Info

Title:

A new variable step-size LMS method and its applicationin DOA estimation of OFDMA signals

Author(s):

Zhao Yan¹;  Lin Li²;  Dong Wen³;  Wang Hao³;  Wu Zhentao³;  Wang Xiaojun³;  Chen Xiaoshu³

¹The PLA’s 61212 Army, Beijing 100000, China
²School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
³National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China

Keywords:

direction of arrival;  variable step-size least mean square;  orthogonal frequency division multiple access;  third-party devices

PACS:

TN929.531

DOI:

10.3969/j.issn.1003-7985.2020.02.004

Abstract:

To meet the requirements of quick positioning of mobile terminals from base stations(BSs)or third-party devices, as well as to improve the convergence speed and reduce the steady state maladjustment of the least mean square(LMS)method, a new logarithmic-sigmoid variable step-size LMS(LG-SVSLMS)was proposed and applied to estimate the direction of arrival(DOA)of orthogonal frequency division multiple access(OFDMA)signals. Based on the proposed LG-SVSLMS, a non-blind DOA estimation system for OFDMA signals was constructed. The proposed LG-SVSLMS adopts a new multi-parameter step-size update function which combines the sigmoid function and the logarithmic function. It controls the adjustment magnitude of step-size during the initial and steady state phases of the LMS method to achieve both a high convergence speed and low steady state maladjustment. Finally, simulation was conducted to verify the performance of the LG-SVSLMS. The simulation results show that the non-blind DOA estimation system based on the LG-SVSLMS can accurately estimate the DOA of the target signal in the scenario where interference signals from multi-source and multi-path fading signals arrive at the third-party devices asynchronously with the target signal, and the estimation deviation is within ±3°. The non-blind DOA estimation for OFDMA signals with the proposed LG-SVSLMS is of great significance for the instant positioning technology of mobile terminals based on the adaptive antenna array.

References:

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Memo

Memo:

Biography: Zhao Yan(1982—), male, doctor, research assistant professor, chym_zhaoyan@163.com.
Foundation items: The Social Development Projects of Jiangsu Science and Technology Department(No.BE2018704), the Technological Innovation Projects of Ministry of Public Security of China(No.20170001).
Citation: Zhao Yan, Lin Li, Dong Wen, et al. A new variable step-size LMS method and its application in DOA estimation of OFDMA signals[J].Journal of Southeast University(English Edition), 2020, 36(2):145-151.DOI:10.3969/j.issn.1003-7985.2020.02.004.

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