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A sliding fractal autoregressive integrated moving average model based on time compensation: SFARIMA

Advances in Information Sciences and Service Sciences 2012年第19期4卷 11-17页

作者： Yin, An-sheng Zhang, Shun-yi Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education China Institute of Information and Network Technology Nanjing University of Posts and Telecommunication China

The traditional Poisson model in the modern data networks have been ineffective and cannot reflect the real flow trend. However, since Hosking discovers the network traffic self-similarity, self-similar models have continued to emerge, this article improved FARIMA model based on time compensation. We put forward a sliding FARIMA model which fixes the time delay of FARIMA model and analyzed the model's application in the anomaly detection of network.

关键词： Software engineering

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Cloud-Edge Collaboration via Preference-based Reinforcement Learning in Semantic communications 11

Cloud-Edge Collaboration via Preference-based Reinforcement ...

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11th International Conference on Advanced Cloud and Big Data, CBD 2023

作者： Xu, Yikai Chen, Mingkai Zhang, Zhe Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing210003 China

ISBN: (纸本)9798350345346

With the development of next-generation mobile communication, semantic communication is considered as a novel technology that focuses on conveying the meaning of a message to the intended users. The key of semantic communication is that the receiver and sender should have the similar background knowledge, hence the semantic knowledge base is the corner-stone of semantic communication. However, how to select an appropriate content as the background knowledge from huge amount of knowledge base data is a challenge in realizing a semantic communication system. Caching partial semantic knowledge bases at edge servers in advance is a promising approach to overcome the above issue. In this paper, we propose a novel semantic knowledge base deployment architecture, in which the specific content of the semantic knowledge base cached at the edge server is determined by the user's personal preferences, fact relevance, and the sender-receiver matching degree. The semantic knowledge base deployment architecture is affected by conditions such as latency and storage capacity of the edge server. Based on preference-based reinforcement learning (PbRL), we propose a policy ranking algorithm to drive the replacement of the categorical cache for semantic knowledge bases to maximize the hit ratio and the sender-receiver matching degree under the constraints of latency and caching capacity. Simulation results show that our algorithm can obtain higher knowledge base hit ratio and matching degree. © 2023 IEEE.

关键词： Reinforcement learning

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Dual-Mode Resonant Sectorial Monopole Antenna with Stable Backfire Gain

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Chinese Journal of Electronics 2024年第6期33卷 1478-1486页

作者： Feiyan JI Heng ZHANG Xiuqiong XING Wenjun LU Lei ZHU Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and Telecommunications Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau

A novel design approach to wideband, dual-mode resonant monopole antenna with stable, enhanced backfire gain is advanced. The sectorial monopole evolves from a linear, 0.75-wavelength electric prototype monopole under wideband dual-mode resonant operation. As theoretically predicted by the two resonant modes TE3/5,1and TE9/5,1within a 150° radiator, the operation principle is revealed at first. As have been numerically demonstrated and experimentally validated at 2.4-GHz band, the designed antenna exhibits a wide impedance bandwidth over 90.1%（i.e., 2.06–5.44 GHz）, in which the stable gain bandwidth in the backfire,-x-direction（θ = 90°, φ = 180°） with peak value of 3.2 dBi and fluctuation less than 3 dB is up to 45.3%（i.e., 3.74–5.44 GHz）. It is concluded that the stable wideband backfire gain frequency response should be owing to the high-order resonant mode in the unique sectorial monopole antennas.

关键词： Fluctuations Azimuth Prototypes Metals Resonance Frequency measurement broadband antennas Impedance Gain Wideband

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Novel self-renewal Hash chain based on Ito-Saito-Nishizeki secret sharing scheme

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Journal of China Universities of Posts and Telecommunications 2012年第SUPPL. 2期19卷 122-127页

作者： Dai, Ting Huang, Hai-Ping Wang, Ru-Chuan Pan, Xin-Xing College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

Hash chain mechanism has been widely used into a variety of encryption applications and services. The introduction of renewable Hash chain overcomes resource-constrained defect in traditional Hash chains, but many current renewable schemes still hold unsatisfactory performance especially on security and complexity. This paper proposed a novel self-renewable Hash chain construction scheme based on Ito-Saito-Nishizeki secret sharing scheme (SSS). It has proved that the proposed Hash chain scheme has higher security and less consumption of communication, computation and memory than the typical schemes proposed in the existing literatures. © 2012 The Journal of China Universities of Posts and Telecommunications.

关键词： Cryptography

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(t, n) secret sharing scheme based on cylinder model in wireless sensor networks

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Journal of networks 2012年第7期7卷 1009-1016页

作者： Huang, Haiping Chen, Hao Wang, Ruchuan Mao, Qian Cheng, Renyuan Nanjing University of Posts and Telecommunications Department of Computer Nanjing University of Aeronautics and Astronautics Department of Computer Science and Technology Nanjing China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Ministry of Education/Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing China

Since the existence of characteristics of heterogeneity, limited energy, complexity and so forth, it turns into a research hot spot on the security mechanism of wireless sensor networks (WSN), especially the problems on the key management. On regard of the deficiency of extant secret sharing schemes, we develop a (t, n) threshold secret sharing scheme which is based on the cylinder model, including the procedures of master-key reconfiguration and sub-key updating. This scheme enables several nodes to be responsible for the security of key together, and by the mean time, we introduce a monitoring mechanism to improve the capability of anti-capturing. With the security theoretical analysis and the comparison with the performance on BPCGR, GKD simulation experiment, it reveals that our scheme satisfies the security requirement of key management in wireless sensor networks, and can effectively reduce the cost on communication and computation. © 2012 ACADEMY PUBLISHER.

关键词： wireless sensor networks

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Cross-modal Semantic communications in 6G

Cross-modal Semantic Communications in 6G

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2023 IEEE/CIC International Conference on communications in China, ICCC 2023

作者： Chen, Mingkai Liu, Minghao Wang, Wenjun Dou, Haie Wang, Lei Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing210003 China

ISBN: (纸本)9798350345384

In 6G communication, semantic communication is considered one of the most promising directions to fulfill users' demands for immersive multi-modal experiences, low latency, and high reliability. We proposes a cross-modal semantic communication approach based on deep learning, where both semantic coding and decoding are carefully crafted to provide optimum performance. Firstly, cross-modal semantic fusion is designed to enable end-to-end data transmission, driven by various task requirements of multi-modal business users. In addition, the proposed approach for evaluation on the semantic similarity is highly effective. It consists of a siamese network and a pseudo-siamese network, which can accurately obtain the matching loss between modal contents. Finally, the simulation results show that the proposed cross-modal semantic communication approach outperforms traditional communication systems, especially in low SNR scenarios. The similarity of cross-modal semantic communication improves by more than 53% compared to the traditional approaches, demonstrating its superiority and feasibility. Overall, our solution can meet the increasing demands of modern communication and facilitate seamless and intuitive experiences for users. © 2023 IEEE.

关键词： Signal processing

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An area constrained MAP localization with channel parameters estimation for indoor rss positioning

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Journal of Computational Information Systems 2015年第17期11卷 6335-6344页

作者： Cai, Zhengguo Shang, Lin Yang, Xuguang Wang, Yingguan Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China

Indoor localization is a significant issue for Internet of Things. However, it is a problem for the indoor positioning to use received signal strength measurements that the signal may be contaminated by the time-variant fading interference due to walls and pedestrians. This paper proposes a novel localization scheme for the mixed line-of-sight and none-line-of-sight environment. It presents a feasible method based on Expectation Maximization to approximate the noise distribution with a mixture of two Gaussians. The MAP estimator takes the indoor architecture into account, regarding it as a constraint to the prior distribution of estimated positions. A multiple links hypothesis is introduced to adapt to the link altering. The experiment demonstrates its better performance of precision and feasibility. © 2015, by Binary Information Press

关键词： Indoor positioning systems

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Entanglement concentration for W-type entangled coherent states

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Chinese Physics B 2014年第8期23卷 269-273页

作者：盛宇波刘炯赵圣阳王磊周澜 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsMinistry of Education Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications College of Mathematics and Physics Nanjing University of Posts and Telecommunications

An entangled coherent state （ECS） is one type of entanglement, which is widely discussed in the application of quan- tum information processing （QIP）. In this paper, we propose an entanglement concentration protocol （ECP） to distill the maximally entangled W-type ECS from the partially entangled W-type ECS. In the ECP, we adopt the balanced beam split- ter （BS） to make the parity check measurement. Our ECP is quite different from the conventional ECPs. After performing the ECP, not only can we obtain the maximally entangled ECS with some success probability, but also we can increase the amplitude of the coherent state. Therefore, it is especially useful in long-distance quantum communication, if the photon loss is considered.

关键词： quantum communication and computation entanglement concentration coherent state

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Multiple regions matching with spin images for 3D face recognition

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Journal of Information and Computational Science 2014年第13期11卷 4487-4497页

作者： Zhang, Cheng Gu, Yuzhang Hu, Keli Wang, Yingguan Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China

This paper presents a novel method for 3D face recognition under expression and occlusion variations. It is based on the combination of the matching results from matching multiple partial regions on the 3D face. Spin image features are used for comparison between faces. Meanwhile, an efficient approach is proposed to detect nose tip and the nose tip determines the location of each candidate region. To fuse the contribution of each region, score-based and rank-based fusion scheme are performed and compared. The proposed method is evaluated on the Bosphorus database and achieves good results. It obtains 96.68% recognition rate in the presence of expression and occlusion variations. Copyright © 2014 Binary Information Press.

关键词： Face recognition

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Complete Bell-state analysis for a single-photon hybrid entangled state

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Chinese Physics B 2013年第3期22卷 179-183页

作者：盛宇波周澜程维文巩龙龑王磊赵生妹 Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications College of Mathematics & Physics Nanjing University of Posts and Telecommunications

We propose a scheme capable of performing complete Bell-state analysis for a single-photon hybrid entangled *** single-photon state is encoded in both polarization and frequency degrees of *** setup of the scheme is composed of polarizing beam splitters,half wave plates,frequency shifters,and independent wavelength division multiplexers,which are feasible using current *** also show that with this setup we can perform complete two-photon Bell-state analysis schemes for polarization degrees of ***,it can also be used to perform the teleportation scheme between different degrees of *** setup may allow extensive applications in current quantum communications.

关键词： quantum communication hybrid entangled state Bell-state analysis

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