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Electronic cluster state entanglement concentration based on charge detection

Chinese Physics B 2014年第2期23卷 138-143页

作者：刘炯赵圣阳周澜盛宇波 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 & Physics Nanjing University of Posts and Telecommunications

We propose an efficient entanglement concentration protocol （ECP） based on electron-spin cluster states assisted with single electrons. In the ECP, we adopt the electron polarization beam splitter （PBS） and the charge detector to construct the quantum nondemolition measurement. According to the result of the measurement of the charge detection, we can ultimately obtain the maximally entangled cluster states. Moreover, the discarded items can be reused in the next round to reach a high success probability. This ECP may be useful in current solid quantum computation.

关键词： entanglement concentration quantum computation cluster states

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Clustered Spatio-Temporal Compression Design for wireless sensor networks

Clustered Spatio-Temporal Compression Design for Wireless Se...

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International Conference on Computer communications and networks (ICCCN)

作者： Siguang Chen Chuanxin Zhao Meng Wu Zhixin Sun Jian Jin Department of Electrical and Computer Engineering The University of British Columbia Vancouver Canada Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China School of Electrical Engineering and Computing Curtin University Perth Australia

Since the temporal and spatial correlations of sensor readings are existent in wireless sensor networks (WSNs), this paper develops a clustered spatio-temporal compression scheme by integrating network coding (NC) and compressed sensing (CS) for correlated data. The proper selections of NC coefficients and measurement matrix are designed for this scheme. This design guarantees the reconstruction of clustered compression data successfully with an overwhelming probability and unifies the operations of NC and CS into real field successfully. Moreover, in contrast to other spatio-temporal schemes with the same computational complexity, the proposed scheme possesses lower reconstruction error by employing the independent encoding in each sensor node (including the cluster head nodes) and joint decoding in sink node. At the same time it has lower computational complexity as compared with JSM-based spatio-temporal scheme by exploiting the temporal and spatial correlations of original sensing data step by step. Finally, the simulation results verify that the clustered spatio-temporal compression scheme outperforms the other two compression schemes significantly in terms of recovery error and compression gain.

关键词： Correlation wireless sensor networks sensors Encoding Computational complexity Decoding Security

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An improved packet sending algorithm based on LTP in Delay Tolerant networks

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Journal of Computational Information Systems 2014年第12期10卷 5279-5286页

作者： Liu, Yan Wang, Kun Xu, Lili Yu, Yue Ouyang, Zhiyou College of Automation and Electrical Engineering Nanjing University of Technology Nanjing 210009 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

In DTN (Delay Tolerant networks), bundle and block shred data to cope with frequent interruption. However, it remains a problem of what impact will be generated on transmission efficiency by the size of bundle and block as well as how to achieve maximum efficiency by adjusting Bundle and block size in terms of environment. This paper focuses on Bundle and LTP (Licklider Transmission Protocol) in transmission layer of DTN and the impact of block size on transmission efficiency. Then a packet sending algorithm is proposed that dynamically varies its strategy to achieve the best transmission efficiency. Finally, simulation results illustrate the advantages of our proposed scheme. Meanwhile, selecting optimum size of block in proposed algorithm can increase the transmission efficiency. 1553-9105/Copyright © 2014 Binary Information Press.

关键词： Delay tolerant networks

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sensor node-assisted asynchronous cooperative spectrum sensing for cognitive radio network

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The Journal of China Universities of Posts and Telecommunications 2014年第5期21卷 17-23页

作者： CAO Kai-tian WANG Dong-lin Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications National Mobile Communications Research Laboratory Southeast University Department of Electrical and Computer Engineering New York Institute of Technology (Nanjing Campus)

In order to take advantage of the asynchronous sensing information, alleviate the sensing overhead of secondary users （SUs） and improve the detection performance, a sensor node-assisted asynchronous cooperative spectrum sensing （SN-ACSS） scheme for cognitive radio （CR） network （CRN） was proposed. In SN-ACSS, each SU is surrounded by sensor nodes （SNs）, which asynchronously make hard decisions and soft decisions based on the Bayesian fusion rule instead of the SU. The SU combines these soft decisions and makes the local soft decision. Finally, the fusion center （FC） fuses the local soft decisions transmitted from SUs with different weight coefficients to attain the final soft decision. Besides, the impact of the statistics of licensed band occupancy on detection performance and the fact that different SNs have different sensing contributions are also considered in SN-ACSS scheme. Numerical results show that compared with the conventional synchronous cooperative spectrum sensing （SCSS） and the existing ACSS schemes, SN-ACSS algorithm achieves a better detection performance and lower cost with the same number of SNs.

关键词： cognitive radio asynchronous cooperative spectrum sensing Bayesian fusion rule ON-OFF model soft decision

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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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Outage analysis of OFDM full Duplex relaying systems

Outage analysis of OFDM full Duplex relaying systems

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International Conference on wireless communications and Signal Processing (WCSP)

作者： Songqing Wang Wendong Yang Wei Xu Jinling Hospital Nanjing University School of Medicine Nanjing China College of Communications Engineering PLA University of Science and Technology Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications). Ministry of Education Nanijing China PLA 95269 Troop Guangzhou China

ISBN: (纸本)9781467376884

This paper focuses on decode-and-forward (DF) OFDM full duplex relaying (FDR) systems with multiple relays, where residual loop interference is taken into account. Closed-form and high-SNR approximate expressions for the outage probability are derived. Simulations are carried out to validate the derived outage performance and compare the performance of OFDM FDR with that of OFDM half duplex relaying (HDR) systems.

关键词： OFDM Relays Interference Approximation methods Signal to noise ratio wireless communication broadband communication

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Temporally and Spatially Correlated Uplink Channel Estimation for Massive MIMO Systems

Temporally and Spatially Correlated Uplink Channel Estimatio...

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International Conference on wireless communications and Signal Processing

作者： Bin Lv Zhen Yang Youhong Feng Key Lab of Broadband Wireless Communications and Sensor Network Technology Ministry Education Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781467376884

It is well known that most wireless channels are sparse. The channel impulse responses (CIRs) of certain size antenna array have a partially shared support due to the spatial correlation. Moreover, the CIRs during adjacent symbols have a common support due to the temporal correlation. In this paper, we propose a novel compressed channel estimation scheme for the uplink massive multi-input multi-out (MIMO) systems based on the assumption of time division duplexing (TDD) mode by exploiting the above mentioned temporal and spatial correlations. Then a joint subspace pursuit (JSP) algorithm is proposed. Simulation results demonstrate the proposed scheme using the JSP algorithm outperforms the classical channel estimation techniques.

关键词： Compressed channel estimation Massive MIMO Temporal and spatial correlations

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Defense technology of Wormhole Attacks Based on Node Connectivity

Defense Technology of Wormhole Attacks Based on Node Connect...

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IEEE International Conference on Smart City/SocialCom/SustainCom (SmartCity)

作者： Jiu-hu Zheng Huan-yan Qian Lei Wang School of Information Technology Jiangsu Institute of Commerce Nanjing Jiangsu China School of Computer Science and Engineering Nanjing University of Science and Technology Nanjing Jiangsu China National Mobile Communications esearch Laboratory Southeast University Nanjing Jiangsu China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing Jiangsu China

ISBN: (纸本)9781509018949

After wormhole attacks the routing mechanism of wireless sensor network (WSN) is damaged, then the hop count and distance between nodes cannot be well matched, so that the WSN becomes the anisotropic sensor network, resulting in security treats for WSN. Considering that wormhole attacks can cause the changing of node connectivity, through the theoretical analysis and derivation, the paper has proposed a method which detects wormhole attacks with the connected relation of high connectivity nodes, and optimizes routing with the help of the normal nodes outside the wormhole. Simulation results show that the algorithm can well detect wormhole attacks and has better localization accuracy In addition, the effect is more obvious in the case of the wormhole nodes with large communication radius and long distance.

关键词： wireless sensor networks Routing Probability Algorithm design and analysis Security Simulation Computer science

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Requirement-oriented privacy protection analysis architecture in cloud computing

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Journal of communications 2015年第1期10卷 55-63页

作者： Ke, Changbo Wang, Ruchuan Xiao, Fu Huang, Zhiqiu School of Computer Sci. and Tech./School of Software Nanjing Univ. of Posts and Telecom Nanjing210023 China Jiangsu High Tech Research Key Laboratory for Wireless Sensor Networks NanjingJiangsu210003 China College of computer Sci. and Tech Nanjing Univ. of Aeronautics and Astronautics NanjingJiangsu210016 China Key Lab of Broadband Wireless Communication and Sensor Network Tech Nanjing University of Posts and Telecom Ministry of Education Jiangsu Province NanjingJiangsu210003 China

As a new software paradigm, cloud computing provides services dynamically according to user requirements. However, it is difficult to control personal privacy information because of the opening, virtualization, multi-tenancy and service outsourcing characters. Therefore, how to protect user privacy information has become a research focus. In this paper, we propose requirement-oriented privacy protection theory analysis architecture and implementation platform. Firstly, the theory analysis architecture is depicted as layers, and we analyze the function and key technologies of every layer. Secondly, we address the privacy property description method with ontology and description logic, and then analyze the theory modules of privacy items conflict checking layer, privacy policy negotiation layer and privacy agreement forensics layer. Thirdly, according to theory architecture, we design the implementation platform of requirement-oriented privacy protection, and discuss the function and workflow. In the end, we conclude and point out the future work. © 2015 Engineering and technology Publishing.

关键词： Data privacy

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A grouping dynamic framed slotted ALOHA collision tracking algorithm

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Journal of Computational Information Systems 2014年第9期10卷 3989-3996页

作者： Zhang, Xuejun Ye, Chuanling Tian, Feng Sun, Zhixin Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Edu. Nanjing University of Posts and Telecommunications Nanjing 210003 China School of Electronic Science and Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China

This paper proposed an improved grouping tag anti-collision algorithm based on the dynamic framed slotted ALOHA algorithm and collision tracking tree algorithm. The analysis of performance and the result of simulation show that this algorithm though combining the ALOHA-based algorithm, tree-based algorithm and grouping theory, improve the throughput of the system efficiency and reduce the total query the number of slots. © 2014 Binary Information Press.

关键词： Radio frequency identification (RFID)

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