Hongwei Liu
Xidian University
1304 Papers
3.9K Citations
Hongwei Liu is an academic researcher from Xidian University. The author has contributed to research in topics: Computer science & Chemistry. The author has an hindex of 67, co-authored 898 publications. Previous affiliations of Hongwei Liu include Harbin Institute of Technology & University of Queensland.
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Papers
Mitigating Sensor Motion Effect for AOA and AOA-TOA Localizations in Underwater Environments
Abstract: The motion of sensors during the measurement period, if not accounted for, can degrade significantly the localization accuracy. This paper investigates the sensor motion effect for the positioning of an object, using angles of arrival only or together with time of arrival measurements. The biases from the AOA and TOA data models when ignoring the motion effect are examined. Positioning algorithms for AOA localization and mixed AOA-TOA localization that account for the motion effect are developed by the pseudo-linear formulation. The algorithms derived include the computationally attractive closed-form estimators and the noise resilient semidefinite programming solutions. The bias coming from the pseudo-linear formulation is analyzed in detail, and it can be subtracted from the closed-form solution to obtain a bias-suppressed estimate. Simulation validates the effectiveness of the proposed solutions in achieving the CRLB performance under Gaussian noise before the thresholding effect occurs.
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Target capacity based simultaneous multibeam power allocation scheme for multiple target tracking application
TL;DR: Simulation results demonstrate that the proposed TC-SMPA scheme can greatly increase the target capacity of the C-MIMO radar when compared with the traditional uniform allocation scheme.
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Defect-related dynamics of photoexcited carriers in 2D transition metal dichalcogenides
TL;DR: In this paper, the defect-related relaxation mechanisms of photoexcited species in TMDs according to the time scale utilizing ultrafast spectroscopy techniques are reviewed and the direction in material design and performance optimization.
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•Journal Article
Tuning the surface structure of nitrogen-doped TiO2Nanofibres : an effective method to rnhance photocatalytic activities of visible-light-driven green synthesis and degradation
Zhanfeng Zheng,Jian Zhao,Yong Yuan,Hongwei Liu,Dongjiang Yang,Sarina Sarina,Hongjie Zhang,Eric R. Waclawik,Huaiyong Zhu +8 more
TL;DR: The surface of the N-doped TiO2 nanofibres can be tuned by facial calcination in air to remove the surface-bonded N species, whereas the core remains N doped as mentioned in this paper.
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Ultrahigh photoconductivity of bandgap-graded CdSxSe1-x nanowires probed by terahertz spectroscopy
Hongwei Liu,Junpeng Lu,Zongyin Yang,Jinghua Teng,Lin Ke,Xinhai Zhang,Limin Tong,Chorng Haur Sow +7 more
TL;DR: The demonstration of the ultrahigh photoconductivity makes bandgap-graded CdSxSe1−x nanowires a promising candidate as building blocks for nanoscale electronic and photonic devices.