|Table of Contents|

[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]

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

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

2020 2
Research Field:
Information and Communication Engineering
Publishing date:


A new variable step-size LMS method and its applicationin DOA estimation of OFDMA signals
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
direction of arrival variable step-size least mean square orthogonal frequency division multiple access third-party devices
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.


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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.
Last Update: 2020-06-20