Zhenghai Wang’s research while affiliated with Nanchang University and other places

... To the best of our knowledge, there exist only two studies in the literature on IRS-assisted visible light positioning (VLP) [29], [30]. The authors in [29] propose an algorithm based on sparse Bayesian learning for solving the localization problem in IRS-assisted indoor VLP, deriving the Fisher information matrix, position estimation bound (PEB), and RMSE expressions for NLOS scenarios. ...

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Visible Light Positioning with Intelligent Reflecting Surfaces under Mismatched Orientations

... In this paper, we focus on visible-light positioning (VLP) [3], [4]. According to the survey papers [3], [4], VLP estimates the distance and angle between the target and an LED by receiving and detecting the light signals from light sources via a photodiode (PD) [5] or a camera [6]. In general, VLP systems can be implemented in indoor environments by utilizing existing lighting devices such as LEDs. ...

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Indoor Drone 3-D Tracking Using Reflected Light From Floor Surfaces

... Preliminary 3D imaging results demonstrated a worst case depth error of 20 mm on a 25 cm distance of the camera target. Another research group presented a novel approach relying on differential phase of arrival [22]. The authors deployed 4 transmitters serving as a dual-frequency orthogonal beacon. ...

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An Experimental Testbed for the Performance Evaluation of Optical Time Difference of Arrival Based Indoor Positioning

... Software equalization is more accurate than hardware equalization at the cost of increased computational resources, which may decrease the data rate performance when the training sequences are too long [22]. Hardware equalization, also known as analog equalizer circuits, has been widely used in broadband optical systems [23]. ...

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Investigation of Hardware Equalizer Based on a Bridged-T Network for High-Speed VLC

... The developed NOMA network with relay investigated to secure communication in turn, enhancing data transmission efficiency and preventing eavesdropping [16]. The VL-NOMA code domain was examined to facilitate nextgeneration high-capacity machine communication presented in [17]. The VL-NOMA wireless device deployed grouping multi-users to evaluate and enable connectivity in gigabits per second [18] for multiple access users. ...

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Analysis of interference effect in VL‐NOMA network considering signal power parameters performance

... Most of the methods mentioned above utilize dermoscopic images directly as inputs for their respective models [18][19][20]. However, these images often contain irrelevant elements such as hair, wounds, pen markings, and air bubbles, which can negatively impact the model's performance. ...

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A Hybrid Convolutional Neural Network Model for the Classification of Multi‐Class Skin Cancer

... Lin et al. [12] reported a self-powered lighttrapping structured Sb 2 S 3 thin film PD with a detectivity of 2.84 × 10 13 Jones to detect weak light signals. The Sb 2 S 3 thin film structure has significant advantages in uniformity, cost, and integration for the visible light communication system [13,14]. The heterojunction in a PD is a crucial point, affecting the detectivity and response speed. ...

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Self-powered Sb2S3 photodetectors with efficient carrier transport enabled by compact vertical TiO2 nanorods

... The RIS-assisted VLC channel model has been established and analyzed in [8], which laid theoretical foundations for the design of the system. Channel capacity improvement and coverage extension were the main research objectives in the RIS-assisted VLC system design [6,9,10]. More than 40% data rate improvement and 300% coverage extension with the assistance of RIS in free-space optic system has been numerically evaluated [11]. ...

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RIS-assisted optical receiver model and reflected angle optimization for visible light communication in mobile environments

... The works in [13] and [14] investigated maximizing the achievable throughput using particle swarm optimization (PSO), where [13] optimized the position of the RIS elements and [14] optimized the assignment of the elements in multiple-input multiple-output (MIMO) setup. In addition, [15] proposed a hybrid NOMA scheme for improving the RIS-assisted VLC system capacity, while [16] studied improving the asymptotic capacity of the multiple-input single-output (MISO) RIS-aided VLC systems by utilizing the theory of quadratic programming. The work in [17] proposed a two-stage deep Q-learning-based resource management framework for RIS-assisted VLC systems to maximize the possible fairness among users and the overall spectral efficiency. ...

Reference:

Sum Rate and Fairness Optimization in RIS-Assisted VLC Systems

... To safeguard different wireless networks, PLS techniques have been extensively studied in the literature for various applications such as cooperative non-orthogonal multiple access (NOMA) networks [23], opportunistic relaying in IoT networks [24], full-duplex relaying [25], energy harvestingbased device-to-device communications [26], and UAV-aided secure wireless communication [27]- [29]. In particular, [28] investigated resource allocation for secure downlink UAV transmissions towards a terrestrial user empowered by a reconfigurable intelligent surface (RIS) where a friendly UAVjammer is employed for communication secrecy. The work in [29] explored improving PLS for a UAV-aided cognitive relay system with the help of cooperative jamming and robust resource management. ...

Reference:

Secure Short-Packet Communications via UAV-Enabled Mobile Relaying: Joint Resource Optimization and 3D Trajectory Design