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IEEE Global communications Conference

作者： Yang Li Mengying Zhang Yang Yang Xudong Wang School of Information Science and Technology ShanghaiTech University Key Lab of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences UM-SJTU Joint Institute Shanghai Jiao Tong University

ISBN: (纸本)9781509013296

Due to the scarcity of the licensed spectrum, Licensed-Assisted Access Long-Term Evolution (LAA-LTE) network can be deployed in unlicensed spectrum, which is currently occupied by different Wi-Fi systems. It is a very challenging problem to ensure fair coexistence between LAA-LTE and Wi-Fi networks, in terms of spectrum sharing and traffic management. To solve this problem, a Fair Downlink Traffic Management (FDTM) scheme is proposed in this paper for hybrid LAA-LTE/Wi-Fi networks. By using the genetic algorithm, FDTM tunes the minimum Contention Window (CW_(min)) values and assigns feasible weights for the LAA eNBs with different traffic loads, thus to achieve (1) fair spectrum sharing with the existing Wi-Fi networks in unlicensed bands, and (2) fair service differentiation for downlink LAA-LTE traffic. Numerical results show our FDTM scheme can guarantee the throughput of Wi-Fi networks in shared unlicensed spectrum, while supporting proportional fairness for the LAA eNBs with different weights and CW_(min) values.

关键词： IEEE 802.11 Standard Throughput Downlink Genetic algorithms Long Term Evolution Biological cells Electronic mail

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Deterministic realization of collective measurements via photonic quantum walks

arXiv

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arXiv 2017年

作者： Hou, Zhibo Tang, Jun-Feng Shang, Jiangwei Zhu, Huangjun Li, Jian Yuan, Yuan Wu, Kang-Da Xiang, Guo-Yong Li, Chuan-Feng Guo, Guang-Can Key Laboratory of Quantum Information University of Science and Technology of China CAS Hefei230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Naturwissenschaftlich-Technische Fakultät Universität Siegen Siegen57068 Germany Beijing Key Laboratory of Nanophotonics Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China Institute for Theoretical Physics University of Cologne Cologne50937 Germany Department of Physics Center for Field Theory and Particle Physics Fudan University Shanghai200433 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China State Key Laboratory of Surface Physics Fudan University Shanghai200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Nanjing210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing210003 China

Collective measurements on identically prepared quantum systems can extract more information than local measurements, thereby enhancing information-processing efficiency. Although this nonclassical phenomenon has been known for two decades, it has remained a challenging task to demonstrate the advantage of collective measurements in experiments. Here we introduce a general recipe for performing deterministic collective measurements on two identically prepared qubits based on quantum walks. Using photonic quantum walks, we realize experimentally an optimized collective measurement with fidelity 0.9946 without post selection. As an application, we achieve the highest tomographic efficiency in qubit state tomography to date. Our work offers an effective recipe for beating the precision limit of local measurements in quantum state tomography and metrology. In addition, our study opens an avenue for harvesting the power of collective measurements in quantum information processing and for exploring the intriguing physics behind this power. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum optics

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A Context-aware Data Processing Model in power communication networks

A Context-aware Data Processing Model in power communication...

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2015 IEEE/CIC International Conference on communications in China - Workshops, CIC/ICCC 2015

作者： Guo, Yunfei Wang, Kun Liu, Shidong Guo, Jinghong Lu, Heng Smart Grid Research Institute State Grid Nanjing210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing210003 China

ISBN: (纸本)9781467397018

The power communication networks is a relatively complex system with high security, which is performed in a number of ways, such as safety of power generation equipment, security of transmission and distribution lines, as well as data transmission security. The core of power communication networks security is context-aware data processing. With continuously extending in scale of the power communication networks, power communication data process become more complicated. In order to realize automatization of data processing of the power communication networks, this paper proposed a Context-aware Data Processing Model in power communication networks (CDPM). In this three-layer architecture, a Distributed Database Based on Data Categorization (DDB-DC) is designed in storage layer, which is able to choose the most efficient approach to store the context-aware data from the gathering layer according to different context-aware data types. Then, a Real-time Feature Extraction algorithm (RFE) for context-aware systems is presented in the computing layer to process the context-aware data stream. The model is a new data processing method in power communication networks. © 2015 IEEE.

关键词： Feature extraction

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Feedback free distributed video coding rate control algorithm

Feedback free distributed video coding rate control algorith...

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International Conference on Information technology and Computer Application Engineering, ITCAE 2014

作者： Zhang, Deng Yin Ma, Teng Sci-tech Park of Internet of Things Nanjing University of Posts and Telecommunication Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunication Ministry of Education Nanjing China

ISBN: (纸本)9781138027176

In this paper, based on the feedback free distributed video coding system, a rate control algorithm was proposed for Wyner-Ziv frames. First, calculate the maximum correlation of coefficient band level between the source WZ frames and adjacent key frames in DCT domain, and the quantization matrix was determined based on maximum correlation and the QP of the key-frames;then, according to the generated low-complexity side information and source WZ frame with DCT transformation and quantization, allocate the bit plane rate. Experimental results show, compared with the existing rate control algorithm without feedback channel, the proposed algorithm can effectively improve the Rate-Distortion performance of the feedback free system with little additional complexity. © 2015 Taylor & Francis Group, London.

关键词： Feedback

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An all dynamic MAC protocol for wireless Body Area network

An all dynamic MAC protocol for Wireless Body Area Network

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11th International Conference on wireless communications, networking and Mobile Computing (WiCOM 2015)

作者： Jun Wang Yutian Xie Qiong Yi Key Lab of Broadband Wireless Communication and Sensor Network Technology NJUPT Nanjing Jiangsu China

ISBN: (纸本)9781510821279

wireless Body Area network (WBAN) is considered as a special type of WSN. It consists of low-power wireless sensor nodes, which are placed on or implanted in the body for continuous health monitoring. MAC protocol is responsible for conflict detection, processing, priority control, timeslot assignment, transmission order etc. So the design of MAC protocol plays an important role in the reliability and efficiency of WBAN. In order to increase the energy efficiency and reliability of WBAN, a new wireless body area network MAC protocol-AD-MAC protocol is proposed. The proposed protocol adopts dynamic priority control, dynamic timeslot allocation mechanism and dynamic length allocation mechanism of different access periods to achieve reliable transmission in the situation of low latency and low power consumption. The simulation results show that AD-MAC protocol is superior to IEEE802.15.6 MAC and CA-MAC in terms of throughput, power consumption and delay.

关键词： Energy-Efficiency IEEE802.15.6 wireless Body Area network body area networks MAC protocol Methotrexate-Actinomycin-Chlorambucil Regimen Energy efficiency wireless dynamic priority conflict detection

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An improved static B+ tree index adaptive to cloud environment for analytic application 5th

An improved static B+ tree index adaptive to cloud environme...

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5th International Conference on Environmental Science and Information Application technology, ESIAT 2014

作者： Wan, Mingxiang Ren, Chunshao Zhang, Dengyin Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunication Ministry of Education Nanjing China Sci-tech Park of Internet of Things Nanjing University of Posts and Telecommunication Nanjing210003 China

ISBN: (纸本)9781138028142

B+ Tree is a special balanced multiway tree with flexible structure and node pages linking to each other. It supports not only rapid random query, but also range query. But B+ Tree index cannot be directly migrated since data storage architecture is different in cloud environment. Based on the characteristics of cloud computing master-slave architecture and combined with the characteristics of the columnar storage in the cloud environment, this paper proposes an improved secondary index of B+ Tree. In this index, primary key still uses key-Value style hash index, which can not only get high search efficiency, but also maintain load balance;other property columns will apply improved B+ Tree index, which can solve the problem of high time complexity when querying non-primary key and also support range query of non-primary key property. © 2015 Taylor & Francis Group, London.

关键词： Flexible structures

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Distributed cooperative spectrum sensing based on consensus among reliable secondary users

Distributed cooperative spectrum sensing based on consensus ...

引用

International Conference on wireless communications and Signal Processing, WCSP 2015

作者： Wei, Ji Haixi, Cao Zhen, Yang College of Telecommunication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing210003 China

ISBN: (纸本)9781467376860

Cooperative spectrum sensing (CSS) is a key technology to improve the sensing performance. Fully distributed CSS has been applied in cognitive radio ad hoc networks with good detection performance. However, when the number of secondary users (SUs) is large and the range of cognitive radio network is wide, sensing overheads (e.g., time and energy consumption) will increase correspondingly. Meanwhile, the reliability of SUs will potentially influence the detection performance. In this paper, a fully decentralized cooperative spectrum sensing scheme based on consensus theory among reliable SUs is proposed. Firstly, belief vector is used for distinguishing the reliable SUs from the unreliables. Secondly, the sub network with most reliable SUs is chose as reliable region, in which sensing information of reliable SUs can be exchanged among their one-hop neighbors with finite iterations based on consensus theory. Lastly, SUs in consensus network will get a consensus sensing outcome which will be shared with SUs outside of consensus network. The proposed scheme does not need the prior knowledge of primary user in the entire process. Simulation results show that the proposed scheme has better detection performance than traditional methods. © 2015 IEEE.

关键词： Energy utilization

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A dynamic context management scheme for 6LoWPAN

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Journal of Computational Information Systems 2015年第9期11卷 3155-3163页

作者： Luo, Bingqing Sun, Zhixin Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing China

This paper aims to propose a design of dynamic context management scheme for low-power wireless personal area networks based on IPv6 (6LoWPAN). In the scheme, a prefix auto-configuration mechanism is established to update the context table dynamically, therefore, no manual configuration or administration is further required. Meanwhile, based on the proposed 6LoWPAN structure, the context distribution and synchronization scheme can be achieved in extended 6LoWPAN domains, which maximized the benefit of 6LoWPAN header compression mechanism. Three main problems can be solved by the dynamic context management scheme on context sharing. One is how to update and maintain the context table;another is when to distribute the context information and the third one is how to synchronize the context information in extended 6LoWPAN domains. Judging from simulation perspective, this paper compares the compression ratio and energy consumed of dynamic context management scheme with that of static context table scheme. The results show that the performance of dynamic context management scheme works better for 6LoWPAN compression. ©, 2015, Binary Information Press. All right reserved.

关键词： wireless sensor networks

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Nonorthogonal object identification based on ghost imaging

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Photonics Research 2015年第5期3卷 238-242页

作者： Xiaofan Gu Shengmei Zhao Institute of Signal Processing & Transmission Nanjing University of Posts and Telecommunications (NUPT) Key Lab of Broadband Wireless Communication and Sensor Network Technology NUPT Ministry of Education

Ghost imaging could be used to make a quick identification of orthogonal objects by means of photocurrent correlation measurements. In this paper, we extend the method to identify nonorthogonal objects. In the method, an object is illuminated by one photon from an entangled pair, and the other one is diffracted into a particular direction by a pre-established multiple-exposure hologram in the idler arm. By the correlation measurements, the nonorthogonal object in the signal arm could be discriminated within a very short time. The constraints for the identification of nonorthogonal objects are presented, which show that the nonorthogonal objects can be discriminated when the overlapping portion between any two objects is less than half of all the objects in the set. The numerical simulations further verify the result.

关键词： Nonorthogonal object identification based on ghost imaging

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A hybrid recommendation algorithm based on social networks

A hybrid recommendation algorithm based on social networks

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International Conference on Quality of Service in Heterogeneous Wired/wireless networks (QSHINE)

作者： Jing Gong MeiLing Gao Bixiao Xu Wenjun Wang Zhixin Sun Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing china College of mathematics & physics of Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing China

ISBN: (纸本)9781479982172

In the light of the problem of collaborative recommendation and content-based cold start, this paper proposes a hybrid recommendation system based on social network. The method is based on the user social relations network. According to the social behavior of user, by establishing the model of social network users, it puts forward the user similarity measure. Then it takes random walk algorithm as a basis and selects out N users who have the highest similarity with the users' interest. The test results show that this method can obtain better recommendation effect and customer satisfaction.

关键词： Collaboration Filtering algorithms Indexes Filtering

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