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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Xiaohuan Wu Wei-Ping Zhu Jun Yan Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications China

ISBN: (纸本)9781509041183

In this paper, a new method for two-dimensional (2-D) direction-of-arrival (DOA) estimation is proposed. We first reconstruct the covariance matrix of the coarray with block-Toeplitz structure and then retrieve the DOAs. Our method is computationally efficient as supported by the derived closed-form expression for the estimated covariance matrix. Unlike other methods, which require fully loaded arrays, the proposed method can be applied in the case of common rectangular arrays with arbitrary geometries. The estimated azimuth and elevation angles are automatically paired. Moreover, our method is of high estimation accuracy and immune to the angle ambiguity effect. Numerical simulations are carried out to verify the effectiveness of the proposed method.

关键词： 2-D DOA estimation Toeplitz-block-Toeplitz structure generalized rectangular array (GRA)

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2nd World Congress on Computer Science and Information Engineering, CSIE 2011

作者： Wang, Haiyan Wang, Ying Yue, Xiwen College of Computer Science Nanjing University of Posts and Telecommunications Nanjing 210003 Jiangsu China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 Jiangsu China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing 210003 Jiangsu China

ISBN: (纸本)9783642257650

A novel trust transmission method which is based on the similarities of nodes in trust models is proposed in this paper. Trust transmission is evaluated by calculating the similarity between recommenders when trustor does not have direct interaction with trustee. However, when there does not have direct recommenders, trust transmission is realized by guaranteed trust chains. Simulation results show that the proposed method improves the trustworthiness of node behavior to some extent and is practical especially in case when nodes do not know each other. © Springer-Verlag Berlin Heidelberg 2012.

关键词： network security

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AN IMPROVED EPON UPSTREAM TRANSMISSION SCHEME WITH ZERO INTER-PERIOD IDLE LOSS

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Journal of Electronics(China) 2011年第4期28卷 664-669页

作者： Shen Jianhua Guo Hongmei Mi Zhengkun Key Lab of Broadband Wireless Communication and Sensor Network Technology （ NUPT） Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

Existing Ethernet Passive Optical network(EPON) Dynamic Bandwidth Allocation(DBA) algorithms suffer from the disadvantage of idle time loss,which lower the upstream bandwidth *** letter proposes an improved upstream transmission scheme with idle-time eliminating *** analysis and numerical calculation prove that the improved scheme can ef-fectively eliminate the idle time and enhance the efficiency of upstream link *** results have shown that the bandwidth utilization can be raised up to 15% in heavy-load scenarios while the time delay performance of Assured Forwarding(AF) and Best Effort(BE) services are improved simultaneously.

关键词： Ethernet Passive Optical network(EPON) Dynamic Bandwidth Allocation(DBA) algorithm Channel transmission scheme Idle time eliminating

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Measurement-device-independent quantum key distribution with hyper-encoding

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Science China(Physics,Mechanics & Astronomy) 2019年第11期62卷 47-56页

作者： Zheng-Xia Cui Wei Zhong Lan Zhou Yu-Bo Sheng Schoool of Science Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Postsand TelecommunicationsNanjing 210003China Institute for Quantum Computing University of Waterloo200 University Ave WWaterloo ON N2L3G1Canada Institute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China

Measurement device-independent quantum key distribution(MDI-QKD) protocols are immune to all possible attacks on the photon detectors during quantum communication, but their key generation rates are low compared with those of other QKD *** each individual photon’s channel capacity is an efficient way to increase the key generation rate, and high-dimensional(HD) encoding is a powerful tool for increasing the channel capacity of photons. In this paper, we propose an HD MDI-QKD protocol with qudits hyper-encoded in spatial mode and polarization degrees of freedom(DOFs). In the proposed protocol, keys can be generated using the spatial mode and polarization DOFs simultaneously. The proposed protocol is unconditionally secure,even for weak coherent pulses with decoy states. The proposed MDI-QKD protocol may be useful for future quantum secure communication applications.

关键词： quantum communication measurement device-independent quantum key distribution high-dimensional hyper encoding

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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 trusted network remediation scheme based on the stability of access terminals

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2nd World Congress on Computer Science and Information Engineering, CSIE 2011

作者： Wang, Haiyan Xu, Mingming College of Computer Nanjing University of Posts and Telecommunications 210003 Nanjing Jiangsu China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks 210003 Nanjing Jiangsu China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province 210003 Nanjing Jiangsu China

ISBN: (纸本)9783642257650

To improve the effectiveness of control and remediation of failure access terminals in trusted network, a novel remediation scheme is proposed in this paper. Based on the introduction of a definition of stability of access terminals and the employment of the architecture of trusted network connect(TNC), the proposed remediation scheme can not only realize a dynamic control on terminal's behaviors but also support a trustworthy remediation. Simulation results demonstrate that the proposed scheme is more effective compared with static and integrity-based remediation scheme and significantly improve the speed of remediation. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Remediation

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Mobile agent based coding aware multipath routing for wireless sensor network

Mobile agent based coding aware multipath routing for wirele...

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6th China Conference of wireless sensor networks, CWSN 2012

作者： Shao, Xing Wang, Ruchuan Lin, Qiaomin Huang, Haiping College of Computer Nanjing University of Posts and Telecommunications XinMoFan Road.66 210003 Nanjing China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks XinMoFan Road.66 210003 Nanjing China Key Lab. of Broadband Wireless Communication and Sensor Network Technology XinMoFan Road.66 210003 Nanjing China

ISBN: (纸本)9783642362514

This paper presents an Mobile Agent based Coding Aware Routing (MA-CAMR) for wireless sensor network, which exploits mobile agent to discovery the routing and coding opportunities, reducing complexity of node design. Besides, the general network coding condition of two cross flows is proposed for coding opportunity discovery. In addition, a novel routing metric, Coding and Energy Aware Routing Metric (CEARM) is proposed, which considers the coding gain, the load and energy of node. MA-CAMR exploits multipath routing and CEARM to balance the network load and energy consumption. Simulation results demonstrate that MA-CAMR could balance network load and energy consumption, reduce energy consumption, and prolong network lifetime. © 2013 Springer-Verlag.

关键词： Mobile agents

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Cooperative beamforming for uav-assisted cognitive relay networks with partial channel state information 4

Cooperative beamforming for uav-assisted cognitive relay net...

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4th IEEE International Conference on Computer and communications, ICCC 2018

作者： Zhu, Shengxiang Yang, Ke Ouyang, Jian Du, Yunjie College of Telecommunications and Information Engineering Nanjing University of Posts and Telecommunications Nanjing China Ministry of Education Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing China

ISBN: (纸本)9781538683392

In this paper, we propose a cooperative beamforming (BF) scheme for unmanned aerial vehicle (UAV)-assisted relay networks, where multiple UAVs are deployed as cognitive relays to assist the signal transmission between a cognitive transmitter and a cognitive receiver. Specifically, assuming that only the partial channel state information of each link is available, we first formulate an optimization problem to minimize the total transmit power of UAV relays under the constraints of the quality-of-service (QoS) requirement of the cognitive network and the interference limitation of the primary network. Then, a vector iterative algorithm is presented to solve the optimization problem so that the optimal BF weight vector is obtained. Finally, simulation results are provided to demonstrate the effectiveness of the proposed BF algorithm and show the effects of UAV number and power constraint on the considered UAV-assisted network. © 2018 IEEE.

关键词： Quality of service

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Research on Time Synchronization Method Under Arbitrary network Delay in wireless sensor networks

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Computers, Materials & Continua 2019年第9期61卷 1323-1344页

作者： Bing Hu Feng Xiang Fan Wu Jian Liu Zhe Sun Zhixin Sun Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsNanjing210003China YuanTong Express Co.LTD Shanghai201705China Department of Computer Science Tuskegee UniversityTuskegeeAL36088USA College of Information Engineering Nanjing University of Finance and EconomicsNanjing210023China

To cope with the arbitrariness of the network delays,a novel method,referred to as the composite particle filter approach based on variational Bayesian(VB-CPF),is proposed herein to estimate the clock skew and clock offset in wireless sensor ***-CPF is an improvement of the Gaussian mixture kalman particle filter(GMKPF)*** GMKPF,Expectation-Maximization(EM)algorithm needs to determine the number of mixture components in advance,and it is easy to generate overfitting and *** Bayesian EM(VB-EM)algorithm is introduced in this paper to determine the number of mixture components adaptively according to the ***,to solve the problem of data packet loss caused by unreliable links,we propose a robust time synchronization(RTS)method in this *** establishes an autoregressive model for clock skew,and calculates the clock parameters based on the established autoregressive model in case of packet *** final simulation results illustrate that VB-CPF yields much more accurate results relative to GMKPF when the network delays are modeled in terms of an asymmetric Gaussian ***,RTS shows good robustness to the continuous and random dropout of time messages.

关键词： Time synchronization particle filter expectation maximization wireless sensor networks(WSNs)

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