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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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Voiceprint recognition based on BP Neural network and CNN 4

Voiceprint recognition based on BP Neural Network and CNN

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2019 4th International Conference on Intelligent Computing and Signal Processing, ICSP 2019

作者： Zhipeng, Dong Jingcheng, Wei Yumin, Xu Qingmin, Meng Xiaoming, Wang Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education College of Telecommunications and Information Engineering Nanjing210003 China National Mobile Communications Research Lab Southeast University Nanjing210096 China

At present, speech recognition has become a key technology of human-computer interaction, which can be used in semantic recognition and speaker identification and other related applications. This paper focuses on a speaker identification scene and the technical design. Because artificial neural network has the ability to distinguish complex classification boundaries, plenty of work on speech recognition had studied multi-layer perceptual networks to improve the accuracy of classification where back propagation method (BP algorithm) has been used. In the studied scheme, when the test objects (speakers) speak the same isolated word, the identification system can judge who the speaker is by identifying the voice voiceprint of different people. Our design not only considers the recognition based on BP as well as its variant, but also explores the voiceprint recognition based on convolution neural network (CNN). Secondly, the network structure and performance are also compared in detail. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Speech recognition

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Research on vertical handoff decision based on PROMETHEE algorithm for heterogeneous wireless networks

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International Journal of Advancements in Computing technology 2012年第17期4卷 334-342页

作者： Shengmei, Liu su, Pan Zhengkun, Mi Broadband wireless communication and sensor network technology key lab. of ministry of education Nanjing University of Posts and Telecommunications Nanjing 210003 China

The PROMETHEE (Preference Ranking Organization METHod for Enrichment Evaluation) algorithm is applied in the vertical handoff decision technology for heterogeneous wireless networks and researched on its performance. Four 3GPP defined traffic classes are considered in performance evaluation. An attribute matrix is constructed by considering the SINR in the source network and the equivalent SINR in the target network, the required bandwidth, the traffic cost and the available bandwidth of participating access networks. Handoff decision meeting multi-attribute QoS requirement is made according to the traffic features. The weight relation of decision elements is determined with Least Square (LS) method. Finally decision is made by using PROMETHEE algorithm based on the attribute matrix and weight vector. The simulation results show that the PROMETHEE algorithm can provide satisfactory vertical handoff performance and the proposed LS-PROMETHEE algorithm can be fit for the characteristics of the traffic.

关键词： Heterogeneous networks

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Poster: Secret key generation from CFR for OFDM TDD systems over fading channels 9

Poster: Secret key generation from CFR for OFDM TDD systems ...

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9th International Conference on communications and networking in China, CHINACOM 2014

作者： Peng, Yuexing Alexandropoulos, George C. Wang, Peng Li, Yonghui Ha, Dac-Binh Key Lab of Universal Wireless Communication Beijing University of Posts and Telecommunications Beijing China Broadband Wireless and Sensor Network Group Athens Information Technology Peania Greece Centre of Excellence in Telecommunications University of Sydney Sydney Australia Institute of Research and Development Duy Tan University Danang Viet Nam

ISBN: (纸本)9781479959709

One of the basic problems in cryptography is the generation of a common secret key between two legitimate parties in order to prevent eavesdropping. In this paper, we develop an information-theoretic secret key generation method that exploits the physical layer properties of the multipath channel in orthogonal frequency division multiplexing (OFDM) systems with time division duplexing (TDD), and in particular the amplitude and phase of the estimated channel frequency response (CFR). Both the fast space decorrelation and the independency of the amplitude and phase of the multipath fading channel are used to generate the secret key, leading to increased secrecy bit rate and negligible secrecy leakage. The effect of the channel estimation error, delay and mobility are investigated for the presented method. Simulation results corroborate the increased performance of the proposed method over existing ones. © 2014 IEEE.

关键词： Orthogonal frequency division multiplexing

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A load-balanced data aggregation scheduling for duty-cycled wireless sensor networks

A load-balanced data aggregation scheduling for duty-cycled ...

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2012 4th IEEE International Conference on Cloud Computing technology and Science, CloudCom 2012

作者： Chen, Zhengyu Yang, Geng Chen, Lei Xu, Jian Wang, Haiyong Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts AndTelecommunications Nanjing 210046 China College of Computer Science and Technology Nanjing University of Posts and Telecommunications Nanjing 210046 China School of Information Technology Jinling Institute of Technology Nanjing 211169 China

ISBN: (纸本)9781467345095

To bridge the gap between limited energy supplies of the sensor nodes and the system lifetime, duty-cycle wireless sensor networks (WSNs) with data aggregation are studied in this paper. We proposed a load-balanced and latency-efficient data aggregation scheduling for duty-cycled WSNs. A shortest path tree (SPT) is used as the routing structure for data aggregation scheduling. In SPT, parent-children assignments are well-designed to assign nodes from level h+1 to the parents at level h such that every parent has a balanced load, while reducing the sleep latency which is a period of time for a sender to wait for its parent to be active. Finally, through the simulation and comparisons, we prove the effectiveness of our approach. © 2012 IEEE.

关键词： Scheduling

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WSSecTool: A web service security analysis tool based on program slicing

WSSecTool: A web service security analysis tool based on pro...

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2012 IEEE 8th World Congress on Services, SERVICES 2012

作者： Fu, Wei Zhang, Yingzhou Zhu, Xianting Qian, Junyan College of Computer Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing Jiangsu 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing Jiangsu 210003 China Dept. of Computer Science and Technology Guilin Univ. of Electronic Technology Guilin 541004 China

ISBN: (纸本)9780769547565

With the development of web service, more and more attention has been drawn to web service in recent years. However, the damage caused by service security problems is becoming more and more serious nowadays. This paper develops a web service security analysis tool, WSSecTool, which is based on program slicing. This tool includes three modules namely slicing module, safety publishing module and testing module. Slicing module analyzes source codes of web service to generate method dependence graph (MDG). After MDG is generated, the tool slices MDG to detect the unsafe methods and the spread of them. Safety publishing module helps to hide unsafe methods to make them invisible to outer users after publishing. Testing module can test the services published by this tool to validate the correctness and feasibility of our analysis method. The experiments show that our tool is effective and practical. © 2012 IEEE.

关键词： Web services

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International Journal of Internet Manufacturing and Services 2014年第4期3卷 341-357页

作者： Win, Nwe Nwe Htay Jianmin, Bao Gang, Cui Harbin Institute of Technology Harbin150001 China Myanmar Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing210003 China

This paper presents an efficient service similarity matchmaking method that considers complex QoS structures and attributes because sole consideration of QoS constraint becomes insufficient to handle sophisticated concepts described in service documents. To overcome the shortcoming of semantic exploitation in traditional matchmaking mechanisms, we propose a novel similarity matchmaking method that compares the equivalences between service advertisements and requirements based on three essential criteria called structure, attribute and constraint similarity. The aim is to reveal the complicated QoS semantic concepts embedded in QoS-based service documents and exploit them in matchmaking. The similarity score obtained from evaluation of each similarity criteria is also calculated and a service collection set with the highest similarity scores is provided to the user as the result. The simulation and experiment results prove that our matchmaking method surpasses the other service matchmaking and discovery techniques. Copyright © 2014 Inderscience Enterprises Ltd.

关键词： Semantics

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Optimal power allocation and relay selection for cognitive two-way AF relaying network

Optimal power allocation and relay selection for cognitive t...

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IET International Conference on Information Science and Control Engineering 2012 (ICISCE 2012)

作者： Ronghua Luo Zhen Yang Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications China

ISBN: (纸本)9781629939254

In an underlay cognitive two-way Amplify-and-Forward (AF) relaying network, secondary users (SUS) and primary user (PU) can share the licensed spectrum simultaneously under the interference threshold constraint. In this paper, the joint power allocation and optimal relay selection scheme is proposed for allocating radio resource on cognitive nodes effectively. For power allocation problem, the objective function is to maximize the achieved minimum Signal to Interference plus Noise Ratio (SINR) at SUS, and the constraints include the total transmit power of cognitive nodes and PU interference threshold, the optimal power allocation algorithm and a simple distributed power allocation algorithm are proposed. Furthermore, based on these results, an optimal two-way relay selection scheme is proposed. Simulation results show that the proposed joint power allocation algorithms and relay selection scheme can achieve excellent system performance.

关键词： Cognitive two-way AF relaying Interference threshold Power allocation Relay selection power splitting interference threshold Allocation Algorithm Transmitter power relay Bidirectional

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Effective Prediction Mode Decision Scheme Concerning Scene Switch

Effective Prediction Mode Decision Scheme Concerning Scene S...

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International Conference on wireless communications and Signal Processing

作者： Wei Pu Dong Hu Education Ministry's Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781509028610

In HEVC, prediction mode decision is essential for efficient coding in applications. While many fast algorithms have been designed to reduce the candidate modes, the features of scene switch frames have seldom been considered. These frames usually have no relationship with the previous frames. Thus, intra modes should be used. In this paper, we propose a simple and efficient Hash-based algorithm. It evaluates the motion intensity of videos and can detect the occurrence of scene switch efficiently. Then chooses the best prediction modes among intra ones directly for CUs in these frames. Experimental results show that it achieves 42% to 53% time saving of the switch frame prediction. Meanwhile, as the prediction time of a switch frame is about 5 to 13 times over that of a normal continuous frame, the algorithm can achieve an outstanding improvement in the prediction of the whole video, especially when dealing with multi-scene videos.

关键词： Mode decision Intra mode Motion intensity Scene switch

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Lorentzian hard thresholding pursuit for compressed sensing in the presence of impulsive noise 4

Lorentzian hard thresholding pursuit for compressed sensing ...

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2014 4th IEEE International Conference on Information Science and technology, ICIST 2014

作者： Yun-Yun, Ji Zhen, Yang College of Communications and Information Engineering Nanjing University of Posts and Telecommunications Nanjing Jiangsu Province210003 China Key Lab of 'Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing Jiangsu Province210003 China

ISBN: (纸本)9781479948086

The Lorentzian hard thresholding pursuit algorithm is proposed in this paper to achieve efficient reconstruction for compressed sensing in the presence of impulsive noise. In the Lorentzian hard thresholding pursuit algorithm, the minimum LL2 norm problem is solved with respect to a support which is obtained through the hard thresholding operator. The convergence and reconstruction performance of the Lorentzian hard thresholding pursuit algorithm is proved in theory in this paper. Experimental results show that the reconstruction performance of the Lorentizian hard thresholding pursuit algorithm is superior to the Lorentzian iterative hard thresholding algorithm which is also an effective algorithm for sparse reconstruction of compressed sensing in the impulsive noise environment. © 2014 IEEE.

关键词： Cost functions

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