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8th International ICST Conference on Communications and Networking in China (CHINACOM)

作者： Xiong, Yanwei Zhang, Jianhua Zhang, Ping Beijing Univ Posts & Telecommun Key Lab Universal Wireless Commun Minist Educ Beijing 100088 Peoples R China

ISBN: (纸本)9781479914067

In many applications, such as communication, speech coding, and audio technology, not only the sampling frequency but also the actual sampling instants are of crucial importance. Fractional sample delay has been widely used in the domain of signal processing. There are many methods to obtain higher delay resolution. However the common defect is that they can not provide a continuous variable accurate delay. In this paper we take into account the characteristic of the information carried by the signal, which is the essence of the signal. A novel method based on the signal sparsity is prosed. Compared to the traditional interpolation algorithm, this method has lower normalized mean square error (NMSE) and can obtain arbitrary sample delay.

关键词： fractional sample delay signal sparsity interpolation algorithm

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A novel method of direction of arrival estimation for large parabolic reflector antenna

A novel method of direction of arrival estimation for large ...

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International Symposium of IEEE-Antennas-and-Propagation-Society / USNC/URSI National Radio Science Meeting

作者： Cao, Hailin Chen, Zhoujian Tao, Lu Liu, Jing Zhu, Chengzhuo Yu, Yantao Fan, Jin Chongqing Univ Ctr Commun & Tacking Telemetering & Command Chongqing 400044 Peoples R China Chinese Acad Sci Natl Astron Observ China Beijing 100012 Peoples R China

ISBN: (纸本)9781538632840

In this paper, a novel approach of direction of arrival (DOA) estimation for large parabolic reflector antenna based on focal-field distributions is proposed. First through simulation, we get the focal field distribution with different incident direction. And then the data received by the array feed is restored by interpolation algorithm. Finally the direction of incoming plane wave can be identified by matching the restoration data with simulation data. Numerical simulation results demonstrate satisfactory performance of the approaches.

关键词： DOA parabolic antenna focal-field distributions interpolation algorithm auto-correlation algorithm

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Research on OFDAM Channel Estimation algorithm in Electrical Private Network 2

Research on OFDAM Channel Estimation Algorithm in Electrical...

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2nd International Conference on Communication and Information Systems (ICCIS)

作者： Yang, Li Yang, Hu Bao, Feng Tao, Ma NARI Grp Corp State Grid Elect Power Res Inst Nanjing 211000 Jiangsu Peoples R China

ISBN: (纸本)9781450353489

In this paper, the channel estimation algorithm based on pilot for orthogonal frequency division multiplexing (OFDM) in electrical special network is studied. Firstly, various channel estimation algorithms are discussed, such as least squares estimation algorithm (LS algorithm) and least mean square error estimation algorithm. And then, a class of interpolation algorithms are introduced, such as linear interpolation, two order linear interpolation and so on. Among them, the time domain filtering algorithm is studied in this paper. In addition, the subspace tracking method is introduced, which is used to track the delay subspace for improving the accuracy of the LS algorithm. The simulation results verify the feasibility of the interpolation algorithm and the time domain filtering algorithm. The research results can be used for communication of the electrical system.

关键词： Orthogonal Frequency Division Multiplexing (OFDM) Channel estimation Time Domain Filtering interpolation algorithm

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Improved Overlapped Block Motion Compensation Using Adaptive Weighting Matrices Design for 3D Wavelet-based Scalable Video Coding 5

Improved Overlapped Block Motion Compensation Using Adaptive...

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IEEE International Conference on Signal Processing, Communications and Computing ICSPCC 2015

作者： Chen, Ying Liu, Guizhong Xi An Jiao Tong Univ Sch Elect & Informat Engn Xian Peoples R China

ISBN: (纸本)9781479989201

Recently, scalable video compression using three-dimensional (3D) discrete wavelet transform has become a promising competitor in the scalable video coding (SVC) field. Overlapped block motion compensation (OBMC) is considered to be a key component of most efficient block-based motion estimation and compensation technologies for 3D wavelet-based SVC. However, the conventional OBMC approach globally smoothes out the prediction intensity field with the uniform window function for all the same-sized blocks, with the result that sharp features such as blocky edges are blurred or over-smoothed in the motion-compensated prediction. In this paper, we propose an improved OBMC scheme that adopts adpative weighting matrices for the case of variable block size motion compensation. Specifically, we resort to a parametric solution in closed form to express the optimal weights for the OBMC windows, based on the spatially-variant prediction of motion vectors. For our OBMC weighting matrices, the proposed interpolation algorithm is more effective in enhancing the coding performance than the most widely used interpolation algorithms, along with both the theoretical and empirical analyses. Experimental results show significant improvement over existing successful 3D wavelet-based scalable video codecs in both objective and subjective quality.

关键词： Overlapped block motion compensation variable block size motion compensation OBMC weighting matrices interpolation algorithm 3D wavelet-based SVC

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Key Technologies Research on Section Display of Full 3D Gas-assisted Injection Molding Simulation Results

Key Technologies Research on Section Display of Full 3D Gas-...

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2nd International Conference on Machine Design and Manufacturing Engineering (ICMDME)

作者： Ren, Qinghai Geng, Tie Chuzhou Univ Chuzhou Anhui Peoples R China Henan Univ Technol Zhengzhou Henan Peoples R China

ISBN: (纸本)9783037857816

Gas-assisted product usually has complex structure, and large differences in wall thickness. In the full-3D numerical simulation of gas-assisted injection molding, the section display technology can describe the plastic melt filling and gas penetration inside the complex gas-assisted product. So it can provide guidance for optimization of product design, mold design and molding parameters[1-3]. In this paper, the section display was achieved by using "effective element" algorithm which based on the pure space analytic geometry thought. The algorithm greatly reduced the amount of computation, and improved the computational efficiency by filtered the intersection calculation and the physical quantity interpolation.

关键词： Full-3D Gas-assisted Injection Molding Simulation Section Display Effective Element interpolation algorithm

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Curvelet Transform Based Super-Resolution Image Processing

Curvelet Transform Based Super-Resolution Image Processing

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12th IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)

作者： Thuong Le-Tien Luc Nguyen-Tan Giang Le-Thach Cao Bui-Thu Hochiminh City Univ Technol Dept Elect & Elect Engn 268 Ly Thuong KietDist 10 Ho Chi Minh City Vietnam Ind Univ Dept Elect Technol Ho Chi Minh City Vietnam

ISBN: (纸本)9781467356046

Super-Resolution (SR) Processing is a technique that produces a High - Resolution (HR) image from a range of Low - Resolution (LR) images. There are many methods for implementing the SR signal processing. In this paper, we introduce a specific transformation that were developed in the recent years called Curvelet Transform (CT), and then apply it in SR Processing to obtain a quality improvement of SR images. We discuss two separate algorithms using the Discrete Curvelet Transform (DCT) and then compare them based on the results of HR images. We find out that the first algorithm, named the iterative algorithm can produce better HR images than the second one, the interpolation algorithm. However, the iterative algorithm also take more computational cost than that of the interpolation algorithm. It is a reasonable trade-off between images quality and processing speed. We also made a comparison between our algorithms and previous works such as the Projection onto Convex Sets (POCS) and the Nearest Neighbourhood algorithms to show the quality improvement.

关键词： Curvelet Transform Superresolution Image Processing Iterative algorithm interpolation algorithm POCS algorithm Nearest Neighbourhood algorithm

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algorithms for nonnegative C² (R²) interpolation

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ADVANCES IN MATHEMATICS 2021年 385卷 107756-107756页

作者： Jiang, Fushuai Luli, Garving K.

Let E subset of R-2 be a finite set, and let f : E -> [0, infinity). In this paper, we address the algorithmic aspects of nonnegative C-2 interpolation in the plane. Specifically, we provide an efficient algorithm to compute a nonnegative C-2 (R-2) extension of f with norm within a universal constant factor of the least possible. We also provide an efficient algorithm to approximate the trace norm. (C) 2021 Elsevier Inc. All rights reserved.

关键词： Nonnegative data interpolation Shape preservation interpolation algorithm

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Optimization Methods of Motion Control System at The Inflection Point 3

Optimization Methods of Motion Control System at The Inflect...

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3rd IEEE Advanced Information Technology, Electronic and Automation Control Conference (IAEAC)

作者： Chen, Mei Wang, Shurun Hefei Univ Technol Sch Elect Engn & Automat Hefei Anhui Peoples R China

ISBN: (纸本)9781538645093

Motion control system has complex features, especially the motion planning problems of the system. Motion control system inevitably causes mechanical vibration when it moves to inflection point in high-speed interpolation process. In this paper, different mathematical models of the inflection point are set up. Outer arc method and inner arc method are put forward to optimize the interpolation algorithm at inflection point. And the advantages and disadvantages of the two methods are analyzed. Combining motion control with intelligent control, the selection of the key length at the inflection point based on fuzzy control theory. Finally, to verify the effectiveness of the methods, an open motion control platform was built, the interpolation algorithm is encapsulated in function block, which accords with the motion control standard proposed by PLCopen.

关键词： motion control inflection point fuzzy control theory interpolation algorithm

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Study on the Multi-axis Motion control based on LabVIEW

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International Conference on Information Technology for Manufacturing Systems (ITMS 2011)

作者： Gao, Junli Song, Haitao Peng, Huaming Liang, Yongzhong South China Univ Tech Sch Business Adm Guangzhou Guangdong Peoples R China Guangdong Univ Tech Sch Automat Guangzhou Guangdong Peoples R China South China Univ Tech Sch Design Guangzhou Peoples R China

ISBN: (纸本)9783037851494

On the basis of study on the key multi-axis motion control theories about acceleration & deceleration control, numerical interpolation algorithm, device drivers and application design technologies based on LabVIEW, verified the feasibility through the 3-axis numerical milling platform developed by ourselves. The platform can also realize the simulation and practical verification about the demonstration teaching process of numerical control machining and 3-dimensional contour of the workpiece machined, and has the significant practical value.

关键词： interpolation algorithm device driver LabVIEW multi-axis motion control

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General Modeling of Converter in Power Electronic Distribution System

General Modeling of Converter in Power Electronic Distributi...

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International Conference on Energy Engineering, ICEE 2023

作者： Liu, Wei Cao, Ran Qu, Changjun Yu, Xuechang Zhao, Yilin Nanjing University of Science and Technology Nanjing China

ISBN: (纸本)9789819771455

The degree of power electronization of the new distribution system is increasing, and the difficulty of electromagnetic transient simulation is also increasing. Hence, this study proposes a general electromagnetic transient modeling method for inverters. Firstly, a physical equivalent model of the insulated gate bipolar transistor used in classical single-phase bridge inverters is established, and its mathematical model is derived. Then, an electromagnetic transient simulation interpolation algorithm considering multiple switch actions and reinitialization is proposed to eliminate errors in the simulation process of equivalent simple models. The simulation characteristics of the proposed equivalent model are basically consistent with the ideal model, and have higher simulation efficiency. Additionally, the proposed interpolation algorithm achieves a balance between simulation calculation accuracy and efficiency. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Electromagnetic transient simulation General Converter interpolation algorithm

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