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Your search keyword '"Yang, XiaoLong"' showing total 145 results
Start Over Author "Yang, XiaoLong" Publisher ieee
145 results on '"Yang, XiaoLong"'

37. Joint User Association and Edge Caching in Multi-Antenna Small-Cell Networks.

Author

Yang, Xiaolong, Fei, Zesong, Li, Bin, Zheng, Jianchao, and Guo, Jing

Subjects
*RECOMMENDER systems, *EDGES (Geometry), *BEAMFORMING, *SIGNAL-to-noise ratio, *INTEGER programming, *MULTICASTING (Computer networks)
Abstract

Caching popular contents at edge networks (such as small-cell base stations) has been proposed to deal with the ever-growing mobile traffic. At the meantime, recommendation system is able to shape user demands for further prompting caching gain. In this paper, we study a multi-antenna multi-cell edge network employing transmit beamforming with caching-aware recommendation and user association. We first establish a framework for the joint problem of beamforming, user association, content caching and recommendation to minimize the content transmission delay of mobile users, by specifying a set of necessary conditions for all four component functions of the network. The resulting optimization problem corresponds to a non-convex, multi-timescale, and mixed-integer programming problem, which is hard to handle. To deal with the difficulty in solving the joint optimization problem by the direct formulation, we equivalently decompose it into three sub-problems. Then, we develop a computationally-efficient iterative algorithm to obtain the sub-optimal solution, where the three subproblems are tackled iteratively. Simulation results are conducted to demonstrate that the proposed algorithm can obtain lower transmission delay than baseline schemes. [ABSTRACT FROM AUTHOR]

Published
2022
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38. Discrete-Time Predictive Sliding Mode Control for a Constrained Parallel Micropositioning Piezostage.

Author

Kang, Shengzheng, Wu, Hongtao, Yang, Xiaolong, Li, Yao, Yao, Jiafeng, Chen, Bai, and Lu, Huimin

Subjects
SLIDING mode control, PIEZOELECTRIC actuators, CLOSED loop systems
Abstract

This article proposes a new discrete-time predictive sliding mode control (DPSMC) for a parallel micropositioning piezostage to improve the motion accuracy in the presence of cross-coupling hysteresis nonlinearities and input constraints. Unlike the traditional linear discrete-time sliding mode control (DSMC), the proposed DPSMC is chattering free and has a faster convergence rate thanks to the design of a nonlinear discrete-time fast integral terminal sliding mode surface. Moreover, by combining with the receding horizon optimization, the sliding mode state is predicted to follow the expected trajectory of a predefined continuous sliding mode reaching law, which also allows the proposed controller to explicitly deal with constraints. The stability of the closed-loop system is analyzed under the model disturbances and constraints, and proves that the proposed DPSMC can offer a smaller quasi-sliding mode bandwidth than the traditional DSMC. The effectiveness of the proposed controller is validated by a series of numerical simulations and experiments. Results demonstrate the advantages of proposed DPSMC over the traditional DSMC method. [ABSTRACT FROM AUTHOR]

Published
2022
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39. Filtering Push–Pull Power Amplifier Based on Multifunctional Impedance Matching Network.

Author

Dong, Gaoya, Yang, Xiaolong, Fang, Yunnan, and Tentzeris, Manos M.

Abstract

A filtering push–pull power amplifier (PPPA) is presented based on the multifunctional impedance matching network (MIMN), which is constructed by coupled lines and open-circuited transmission lines. Due to the symmetry of designed MIMN, the even-and odd-mode method is employed to analyze the operating mechanisms, which reveal that designed MIMN can achieve high common mode suppression under the even-mode excitation, while provide good impedance transformation and filtering response under the odd-mode excitation. Finally, a filtering PPPA based on the MIMN is designed as well as measured, and the measured operating frequencies are ranging from 1.85 to 2.03 GHz. The measured maximum gain and peak power-added efficiency are 13.9 dB and 57.8%, while the measured upper stopband extends to 4.1f0 with the suppression level of 20 dB. [ABSTRACT FROM AUTHOR]

Published
2022
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40. Structural Parameters Optimization of Rectangular Sealing Ring Based on Orthogonal Test

Author

Yuan Xiaozhongling, Yang Xiaolong, Jiang Li, Li Tuo, and Chen Fei

Subjects
Ring (mathematics), Chamfer, Materials science, Physics::Instrumentation and Detectors, business.industry, Physics::Medical Physics, Structural engineering, Deformation (meteorology), Compression (physics), Finite element method, Stress (mechanics), Contact mechanics, von Mises yield criterion, business
Abstract

The rectangular sealing ring mainly used in static sealing structure is usually subject to sealing failure, permanent deformation and other problems in practical use. The two-dimensional axis-symmetrical finite element analytical model of rectangular sealing ring during working is established to deal with the above prominent problems based on Von Mises yield principle, virtual work principle, axial symmetry principle and nonlinear contact theory, and orthogonal optimization is used to optimize the key structural parameters of rectangular sealing ring such as section width, section thickness and chamfer size to acquire the optimal combination scheme for key parameters of sealing ring, and contrastive analysis is done on the mechanical property of sealing ring before and after optimization. The research results indicate that: First the ranking of the factors affecting the performance of rectangular sealing ring in descending order is: section width, chamfer size, section thickness; Second the optimal combination for key structural parameters of rectangular sealing ring is: section width of 4 mm, section thickness of 3.5 mm, and chamfer size of 0.3 mm; Third compared with that before optimization, the maximum contact stress of rectangular sealing ring after optimization is improved by 21.87% on average, amount of compression reduced by 11.59% on average, and the maximum Mises stress increased only by 7.72% on average; fourth under the same axial assembly force, the optimized rectangular sealing ring has the contact stress increased, the amount of compression reduced and the risk of permanent deformation lowered; Fifth, Mises stress and contact stress of the optimized rectangular sealing ring are uniformly distributed, beneficial to improving the sealing performance. According to the conclusion, the rectangular sealing ring after parameter optimization can better satisfy the requirements on sealing performance and avoid permanent deformation.

Published
2020

41. Airport-Specific Light-Guiding Taxiing Guidance Sign

Author

Li Tuo, Chen Fei, Yang Xiaolong, Ma Xiaodan, and Jiang Li

Subjects
Brightness, Light source, Computer science, business.industry, Bar (music), Volume (computing), Light guide, Computer vision, Artificial intelligence, business, Visual navigation, Sign (mathematics)
Abstract

The taxiing guidance sign is an airport visual navigation aid. At present, most common signs are of light bar structures, which use various light sources and complicated installation methods. The LED light-guiding taxiing guidance sign herein uses LED as the light source and employs the light guide module to achieve uniform brightness, thus effectively reducing the volume of the sign, reducing the number of light sources, facilitating the installation and maintenance, and being more suitable for airport application.

Published
2020

43. Decimeter Level Indoor Localization Using WiFi Channel State Information.

Author

Yang, Runming, Yang, Xiaolong, Wang, Jiacheng, Zhou, Mu, Tian, Zengshan, and Li, Lingxia

Abstract

Indoor localization using WiFi signal parameters is challenging, with encouraging decimeter localization results available with enough line-of-sight coverage and hardware infrastructure. This paper proposes a new 2-dimensional multiple packets based matrix pencil (2D M-MP) method to estimate the Angle of Arrival (AoA) and Time of Flight (ToF) based on WiFi channel state information (CSI). Compared with the conventional parameter estimation algorithms, this method has two advantages. First, 2D M-MP method uses the discrete Fourier transform (DFT) to convert the complex computation into real computation to reduce the computational complexity significantly without losing accuracy. Second, it accumulates multiple CSI packets to improve the parameter estimation accuracy effectively, especially at low values of signal-to-noise-ratio (SNR) environment. To verify the practicability of our proposed 2D M-MP method, we set up a localization system in an actual scenario using commodity WiFi cards which demonstrates that the performance of 2D M-MP method is better than conventional parameter estimation algorithms and can achieve a localization accuracy of 42 cm in indoor hall deployment. [ABSTRACT FROM AUTHOR]

Published
2022
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44. A Fractional-Order Normalized Bouc–Wen Model for Piezoelectric Hysteresis Nonlinearity.

Author

Kang, Shengzheng, Wu, Hongtao, Li, Yao, Yang, Xiaolong, and Yao, Jiafeng

Abstract

This article presents a new fractional-order normalized Bouc–Wen (BW) (FONBW) model to describe the asymmetric and rate-dependent hysteresis nonlinearity of piezoelectric actuators (PEAs). In view of the fact that the classical BW (CBW) model is only efficient for the symmetric and rate-independent hysteresis description, the FONBW model is devoted to characterizing the asymmetric and rate-dependent behaviors of the hysteresis in PEAs by adopting an $N$ th-order polynomial input function and two fractional operators, respectively. Different from the traditional modified BW models, the proposed FONBW model also eliminates the redundancy of parameters in the CBW model via the normalization processing. By this way, the developed FONBW model has a relatively simple mathematic expression with fewer parameters to simultaneously characterize the asymmetric and rate-dependent hysteresis behaviors of PEAs. Model parameters are identified by the self-adaptive differential evolution algorithm. To validate the effectiveness of the proposed model, a series of model verification and inverse-multiplicative-structure-based feedforward control experiments are carried out on a PEA system. Results show that the proposed model is superior to the CBW model and traditional modified BW model in modeling accuracy and hysteresis compensation. [ABSTRACT FROM AUTHOR]

Published
2022
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