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2020 International Symposium on Automation, Information and Computing, ISAIC 2020

作者： Ma, Hao Hu, Dong Li, Yi Jiangsu Province’s Key Lab of Image Procession and Image Communications Nanjing210003 China Education Ministry’s Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing210003 China Education Ministry’s Engineering Research Center of Ubiquitous Network and Heath Service Nanjing University of Posts and Telecommunications Nanjing210003 China

This paper presents a joint parallel loop filtering algorithm based on multi-thread load balancing in HEVC decoding, which implements the parallel processing of deblocking filtering (DBF) and sample adaptive compensation (SAO). Because of the diversity of video, the texture of different regions in an image is also different, which leads to various CTU partition methods. Therefore, the number of the boundary to be filtered is greatly different, resulting the computation load among multiple threads unbalanced in parallel processing. To solve this problem, an area division scheme is proposed, which divides the image into multiple areas, and the number of boundaries to be filtered in each area is similar. Then, the mapping relationship table is used to allocate these areas to multiple threads for parallel processing, so as to achieve the load balancing among the filtering threads. Finally, the cache technology is used to combine DBF and SAO to reduce the delay between them and improve the overall parallelism of the loop filter. Experimental results show that the performance of the proposed load balancing joint filtering algorithm is 8.15% higher than the previous scheme. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Textures

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Nanoparticle trapping by counter-surface plasmon polariton lens

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Chinese Optics Letters 2022年第2期20卷 177-181页

作者： Jingjing Hong Xingping Zhou Rui Zhuang Wei Peng Jiawei Liu Aiping Liu Qin Wang Institute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China

A counter-surface plasmon polariton lens(CSPPL) is proposed to perform stable nanoparticle trapping by providing up to120 k;T optical potential depth. The optical potential depth is related to the incident angle and phase difference of the light incident on two gratings of CSPPL. The depth of optical potential can be manipulated with negligible displacement by the incident angle less than 20°. Both the depth and the center position of the optical potential well can be manipulated by the incident phase difference. The study of stable and manipulatable optical potential on the CSPPL promotes the integration of optical tweezers.

关键词： optical tweezers surface plasmon polaritons optical potential interference

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Resource Allocation for Outage Probability Minimization in Cognitive wireless Powered communication networks

Resource Allocation for Outage Probability Minimization in C...

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International Conference on communication technology (ICCT)

作者： Qun Li Ding Xu Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China

This paper considers a cognitive wireless powered communication network (CWPCN) consisting of a cognitive base station (CBS) and a set of secondary users (SUs) sharing spectrum with a primary user (PU). The transmission time is assumed to be divided into two parts, where the CBS transfers energy in the downlink during the first time part, and the SUs use the harvested energy to transmit in the uplink based on the time-division multiple access (TDMA) during the second time part. We investigate the problem for minimizing the average outage probability of the SUs by jointly optimizing the time allocation and the downlink transmit power allocation under the interference power and the transmit power constraints and propose a heuristic algorithm to solve it. Simulations show that the proposed algorithm greatly outperforms the benchmark algorithms.

关键词： Resource management wireless communication Interference Power system reliability Probability wireless sensor networks Downlink

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An energy optimization scheme based on rate guarantee in emergency mesh network

An energy optimization scheme based on rate guarantee in eme...

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2011 International Conference on wireless communications and Signal Processing, WCSP 2011

作者： Zhao, Su Liang, Changqing Meng, Qingmin College of Telecommunication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China National Mobile Communications Research Lab. Southeast University Nanjing 210003 China

ISBN: (纸本)9781457710100

The wireless mesh network (WMN) is effective as emergency networks in disaster area which has a flexible network topology. The efficiency of the energy is particularly important in the emergency communication network. In this paper, we proposed an energy optimization scheme based on the framework of wireless mesh networks. This scheme ensures the data rate achieved under the condition of the original transmission power in the wireless mesh network, by reducing the mutual interference between nodes to make the transmission power of the nodes down, thus extends the lifespan of the emergency network effectively. A number of simulation results show that the proposed scheme can reduce the transmission power of nodes while ensuring the end-to-end data rates. © 2011 IEEE.

关键词： MESH networking

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QoS-guaranteed cross-layer resource allocation algorithm for multiclass services in downlink LTE system

QoS-guaranteed cross-layer resource allocation algorithm for...

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2010 International Conference on wireless communications and Signal Processing, WCSP 2010

作者： Ai, Qing Wang, Ping Liu, Fuqiang Wang, Yujin Yang, Feifei Xu, Jing Broadband Wireless Communication and Multimedia Laboratory Tongji University Shanghai China Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China Shanghai Research Center for Wireless Communications Information Building 280 Linhong Road Shanghai 200335 China

ISBN: (纸本)9781424475551

In this paper, a QoS-guaranteed cross-layer resource allocation algorithm for multiclass services in downlink LTE system is proposed, which takes EXP rule, channel quality variance, real-time services and non-real-time services and minimum transmission rate into account. The key features of the proposed algorithm are that all the users and resource blocks will be allocated step by step respectively. Numerical results demonstrate that the proposed algorithm effectively guarantees the user QoS requirement for multiclass services. At the same time, it mainly maintains the throughput and fairness performances in a high level. ©2010 IEEE.

关键词： Quality of service

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Double-Blockchain Assisted Secure and Anonymous Data Aggregation for Fog-Enabled Smart Grid

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Engineering 2022年第1期8卷 159-169页

作者： Siguang Chen Li Yang Chuanxin Zhao Vijayakumar Varadarajan Kun Wang Jiangsu Key Lab of Broadband Wireless Communication and Internet of Things Nanjing University of Posts and TelecommunicationsNanjing 210003China Jiangsu Engineering Research Center of Communication and Network Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China Anhui Provincial Key Laboratory of Network and Information Security Anhui Normal UniversityWuhu 241000China School of Computer Science and Engineering Vellore Institute of TechnologyChennai 600127India Department of Electrical and Computer Engineering University of CaliforniaLos AngelesCA 90095USA

As a future energy system,the smart grid is designed to improve the efficiency of traditional power systems while providing more stable and reliable ***,this efficient and reliable service relies on collecting and analyzing users’electricity consumption data frequently,which induces various security and privacy *** address these challenges,we propose a double-blockchain assisted secure and anonymous data aggregation scheme for fog-enabled smart grid named ***,we design a three-tier architecture-based data aggregation framework by integrating fog computing and the blockchain,which provides strong support for achieving efficient and secure data collection in smart ***,we develop a secure and anonymous data aggregation mechanism with low computational overhead by jointly leveraging the Paillier encryption,batch aggregation signature and anonymous *** particular,the system achieves fine-grained data aggregation and provides effective support for power dispatching and price adjustment by the designed double-blockchain and two-level data ***,the superiority of the proposed scheme is illustrated by a series of security and computation cost analyses.

关键词： Blockchain Fog computing Homomorphic encryption Smart grid Anonymity

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Gradient-Free optimization algorithm for single-qubit quantum classifier

arXiv

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arXiv 2022年

作者： Zhang, Anqi He, Xiaoyun Zhao, Shengmei Nanjing210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing210003 China

In the paper, a gradient-free optimization algorithm for single-qubit quantum classifier is proposed to overcome the effects of barren plateau caused by quantum devices. A rotation gate RX() is applied on a single-qubit binary quantum classifier, and the training data and parameters are loaded into with the form of vector-multiplication. The cost function is decreased by finding the value of each parameter that yield the minimum expectation value of measuring the quantum circuit. The algorithm is performed iteratively for all parameters one by one, until the cost function satisfies the stop condition. The proposed algorithm is demonstrated for a classification task and is compared with that using Adam optimizer. Furthermore, the performance of the single-qubit quantum classifier with the proposed gradient-free optimization algorithm is discussed when the rotation gate in quantum device is under different noise. The simulation results show that the single-qubit quantum classifier with proposed gradient-free optimization algorithm can reach a high accuracy faster than that using Adam optimizer. Moreover, the proposed gradient-free optimization algorithm can quickly completes the training process of the single-qubit classifier. Additionally, the single-qubit quantum classifier with proposed gradient-free optimization algorithm has a good performance in noisy environments. Copyright © 2022, The Authors. All rights reserved.

关键词： Cost functions

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Moving Object Distance Estimation Method Based on Target Extraction with a Stereo Camera

Moving Object Distance Estimation Method Based on Target Ext...

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International Conference on Image, Vision and Computing (ICIVC)

作者： Jingyi Zhang Jianxin Chen Qingyu Lin Liming Cheng Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing China

ISBN: (纸本)9781728123264

Real-time distance estimation with high accuracy is crucial to robot applications such as navigation and obstacle negotiation. However, considering the truth that high accuracy brings huge computation, the previous work either accelerates the distance estimation process through hardware, or only estimates the static objects, or sacrifices accuracy to realize real-time. In order to improve the trade-off between speed and accuracy, in this paper we propose a stereovision-based method that integrates the object detection and tracking into stereo matching. We utilize kernelized correlation filter (KCF) to track the moving object, and then extract target regions from image pair as input images to compute disparity map. In addition, we update each pixel's disparity by a simple but effective approach to further refine disparity map. Eventually, distance is calculated with disparity by triangulation. Experimental results show that our proposed method is suitable for dynamic environment, the extraction method improves the speed of the entire system, and the average accuracy of distance estimation can achieve over 95% from 88 cm to 300 cm when baseline is 151 mm.

关键词： Distance estimation Stereo vision KCF tracking Target region extraction Disparity refinement Triangulation Stereo cameras triangulation Stereoviews extraction of object Object detection object distance Static objects

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QoE Optimization for Traffic Offloading from LTE to WiFi

QoE Optimization for Traffic Offloading from LTE to WiFi

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IEEE Global Conference on Consumer Electronics (GCCE)

作者： Feng Tian Yue Yu Dapeng Li Jingwu Cui Yue Dong Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Ministry of Education Nanjing China

ISBN: (数字)9781728135755

ISBN: (纸本)9781728135762

In this paper, a novel QoE (Quality of Experience) optimization mechanism is proposed for the coexistence between LTE and WiFi networks, where traffic offloading is enabled from LTE to WiFi. Firstly, the throughput models of LTE and WiFi are analyzed, respectively. And then the users' satisfaction function is introduced to measure QoE. An optimal problem that maximizing the QoE of LTE network with guaranteeing the QoE of WiFi network, is formulated and solved by transformation and simplification. Simulation results indicate that traffic offloading can greatly improve the QoE of LTE network.

关键词： wireless fidelity Long Term Evolution Quality of experience Optimization Throughput wireless communication Interference

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Geometry Based LM of Robot to Imitate Human Motion with Kinect

Geometry Based LM of Robot to Imitate Human Motion with Kine...

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International Conference on Image, Vision and Computing (ICIVC)

作者： Wei Guo Jianxin Chen Ming Zhang Zhaolai Pan Ministry of Education Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Nanjing China

ISBN: (纸本)9781728123264

Humanoid robots are easily accepted by people because they have a body shape and appearance close to human. Humanoid robots have many application scenarios and great application potentials. Nevertheless, it is not easy to realize robot simulation due to the different physical structures of human bodies and robots. In this paper, we propose a geometry based LM algorithm for the robot to imitate the human motion of upper limb in real time. This method greatly improves the joint angle similarity under the premise of ensuring the similarity of the end trajectories. We designed a comprehensive and unrestricted motion simulation experiment to verify this method.

关键词： Kinect Inverse kinematic Nao Levenberg-Marquardt Geometry game player geometry Robot Human motion Humanoid robots Human Body

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