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12th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics, CISP-BMEI 2019

作者： Liu, Xiaoyu Kong, Huaicong Lin, Min Zhu, Wei-Ping College of Telecommunications and Information Engineering Nanjing University of Posts and Telecommunications Nanjing China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China Concordia University Department of Electrical and Computer Engineering Montreal Canada

ISBN: (纸本)9781728148526

In this paper, we investigate and propose a new transmission scheme for integrated satellite-terrestrial relay network, where a terrestrial relay equipped with multiple antennas either keeps silent or forwards message to the terrestrial user according to amplify-and-forward (AF) protocol based on the quality of the channel between the satellite and the user. By utilizing the maximal ratio combining (MRC) and maximal ratio transmission (MRT), we derive a closed-form expression for the exact outage probability (OP) of the system. Finally, numerical simulation results are provided to validate the theoretical performance analysis and reveal the impacts of the channel parameters and SNR threshold on the considered system performance. © 2019 IEEE.

关键词： Satellites

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Spectral Efficient Resource Allocation Algorithm in Indoor Terahertz Downlink networks 13

Spectral Efficient Resource Allocation Algorithm in Indoor T...

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13th International Conference on wireless communications and Signal Processing, WCSP 2021

作者： Zhu, Fanshu Yan, Feng Shen, Fei Xia, Weiwei Hu, Jin Shen, Lianfeng Southeast University National Mobile Communications Research Laboratory Nanjing210096 China Shanghai Institute of Microsystemand and Information Technology Chinese Academy of Sciences Key Lab of Wireless Sensor Network and Communication Shanghai200050 China

ISBN: (纸本)9781665407854

Terahertz (THz) communication has become one of the high-profile technologies in the sixth generation (6G) mobile communication networks due to its huge bandwidth and ultra-high data transmission rate. In this paper, the resource allocation algorithm for indoor THz networks is investigated and a problem is formulated to maximize the spectral efficiency (SE). The optimization problem is decomposed into two sub-problems including sub-band allocation problem and power allocation problem. In the first stage, the sub-band allocation problem is solved using Hungarian algorithm based on the Long-User-Central-Window (LUCW) principle. In the second stage, the sequential quadratic programming (SQP) algorithm is used to obtain the optimal power allocation. Finally, simulation results show that the proposed algorithm has higher SE comparing with some conventional schemes. © 2021 IEEE.

关键词： Spectrum efficiency

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Research of Malicious Code Attack Effect Based on Synthetic Entropy Method

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Chinese Journal of Electronics 2023年第3期22卷 449-454页

作者： LI Peng WANG Ruchuan College of Computer Nanjing University of Posts and Telecommunications Nanjing China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing China

To resolve the problem of assessing the effect of a network attack, this paper combines cross entropy with network character entropy method and proposes scheme to evaluate the malicious code attack effect. It captures the related indicators in real time and normalizes the data so as to evaluate it at the same level. It adopts cross entropy method to pretreat the indicators adaptively. We calculate the weight coefficient and exploit network character entropy method to evaluate the attack with accuracy according to the importance of the indicators in the evaluation system. Experimental results and corresponding comparisons reveal that the proposed method can quantitatively determine the exact effect of the malicious code attack.

关键词： Industries Medical services Entropy Malware Real-time systems Information technology

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Dynamic Mapping and Quality of Service Driven Re-Embedding in Virtualization Environment

Dynamic Mapping and Quality of Service Driven Re-Embedding i...

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IEEE Global communications Conference

作者： Haotong Cao Shengchen Wu Qin Wang Longxiang Yang Key Lab of Broadband Wireless Communication and Sensor Network Technique Nanjing University of Posts and Telecommunications Ministry of Education Nanjing China

ISBN: (数字)9781728109626

ISBN: (纸本)9781728109633

Embedding customized virtual networks (VNs) onto the underlying physical network (PN) is a key issue in virtualization research. This issue is virtual network embedding (VNE). Since the issue inception, multiple mapping algorithms have been studied. However, prior mapping algorithms are mostly static. Existing dynamic mapping algorithms just focus on accepting as many VNs as possible. No existing dynamic algorithm considers optimizing the quality of service (QoS) performance of each accepted VN. On these backgrounds, we jointly investigate the dynamic VN embedding and optimize the QoS performance of each accepted VN. A dynamic heuristic algorithm is proposed. When one VN service is requested, the VN will be mapped by the dynamic heuristic algorithm. If the QoS demand of the VN is not guaranteed, the re-embedding scheme of the heuristic algorithm will be driven. Certain virtual elements of the VN will be re-embedded. The dynamic embedding algorithm ensures flexible VN assignment and improves the PN resource utilization. Finally, simulation results are illustrated in order to highlight our proposed dynamic algorithm. For instance, VN acceptance ratio of our dynamic heuristic algorithm improves at least 13%.

关键词： Heuristic algorithms Quality of service Delays Bandwidth Propagation delay Virtualization

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Practical quantum key distributions with single-photon-added coherent sources

Practical quantum key distributions with single-photon-added...

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第十六届全国量子光学学术报告会

作者： Dong Wang Zheng-Fu Han Guang-Can Guo Feng Zhu Qin Wang Key Lab of Quantum Information University of Science and Technology of ChinaCAS Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsMinistry of Education

We propose new schemes on implementing the single-photon-added coherent source in the quantum key *** apply the source in either the standard BB84 protocol or the new proposed measurement-device-independent quantum ke... 详细信息

关键词： Practical quantum key distributions with single-photon-added coherent sources

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Secure Efficient Routing Based on network Coding in the Delay Tolerant networks

Secure Efficient Routing Based on Network Coding in the Dela...

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2014 IEEE 5th International Conference on Software Engineering and Service Science

作者： Jianmin Bao Shu Zhang Junjie Zhang Kun Wang Haifeng Hu Key Lab of Broadband Wireless Communication and Sensor Network Technology （Nanjing Univ. of Posts and Telecommunications） Ministry of Education Nanjing University of Posts and Telecommunications

The Delay/Disruption Tolerant network（DTN） is characterized with long delay,high bit-error rate,intermittent connectivity and frequent *** to this,network coding is introduced to improve its transmission performance *** DTN routing algorithms based on network coding have been ***,they are susceptible to various malicious *** this paper,we propose a new kind of networking scheme suitable to the DTN,which can resist the eavesdropping attacks to a certain ***,we establish a DTN network model based on the packet path optimization allocation algorithm and redefine the packet format to meet the algorithm ***,to resist the dropping attacks,the source node dynamically adds redundancy factors at the certain *** the pollution attacks and the data tampering attacks can almost be resisted by means of mutual authentication between intermediate *** approach avoids the traditional anti-tampering attack algorithm over-reliant on the source *** security analysis and simulation results show that our scheme can effectively resist the joint attacks and optimize the network performance.

关键词： delay tolerant networks（DTNs） network coding joint-attack

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A DISTRIBUTED COMPRESSED SENSING APPROACH FOR SPEECH SIGNAL DENOISING

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Journal of Electronics(China) 2011年第4期28卷 509-517页

作者： Ji Yunyun Yang Zhen College of Communication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts ＆ Telecommunications Nanjing 210003 China

Compressed sensing,a new area of signal processing rising in recent years,seeks to minimize the number of samples that is necessary to be taken from a signal for precise *** precondition of compressed sensing theory is the sparsity of *** this paper,two methods to estimate the sparsity level of the signal are *** then an approach to estimate the sparsity level directly from the noisy signal is ***,a scheme based on distributed compressed sensing for speech signal denoising is described in this work which exploits multiple measurements of the noisy speech signal to construct the block-sparse data and then reconstruct the original speech signal using block-sparse model-based Compressive Sampling Matching Pursuit(CoSaMP) *** simulation results demonstrate the accuracy of the estimated sparsity level and that this de-noising system for noisy speech signals can achieve favorable performance especially when speech signals suffer severe noise.

关键词： Distributed compressed sensing Sparsity estimation Speech signal Denoising

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Stable time synchronization for wireless sensor network by adaptive value tracking

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ICIC Express Letters, Part B: Applications 2016年第1期7卷 135-141页

作者： Hu, Bing Sun, Zhixin Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications No. 66 New Mofan Road Nanjing210003 China

A desirable time synchronization protocol based on flooding in wireless sensor networks (WSNs) should neither demand fast propagation of latest time information nor keep track of the neighboring nodes. Moreover, such a protocol is strictly required to have a stable and energy efficient synchronization process. In this paper, we propose a stable time synchronization algorithm by adaptive value tracking that has smooth convergence process and low energy consumption. By considering both logical clock value and average rate of logical clock, each sensor node keeps synchronization with the rate of reference clock through successive feedbacks, and then adjusts clock offset of the node, and the network-wide synchronization is established fast without demanding fast propagation of latest time information and keeping track of the neighboring nodes. From our example comparison, we observed that the proposed algorithm provides stable time synchronization compared to the time synchronization algorithm by adaptive value tracking. © 2016.

关键词： Synchronization

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Genetic algorithm based coding aware routing for wireless mesh networks

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Advances in Information Sciences and Service Sciences 2012年第5期4卷 235-243页

作者： Shao, Xing Wang, Ruchuan Xu, He Huang, Haiping Sun, Lijuan College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China College of Computer Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing 210003 China

network coding has been confirmed as a potential technology to improve performance of wireless mesh networks (WMNs) and a few network coding aware routings have been proposed. However, these mechanisms detect coding opportunities through local traffic pattern checking, which hardly obtains optimal routes. This paper proposes a Genetic algorithm based Coding Aware Routing (GCAR) for wireless mesh networks, which employs genetic algorithm to optimize routes and coding opportunities. In addition, the key ingredients in GCAR, e.g., chromosome representation, genetic operation of crossover and mutation, fitness function considering coding opportunity and interference, are carefully designed. Through simulations on a randomly generated wireless mesh network, GCAR is shown to find optimal routes within a short time, and achieve more improvements than the previously proposed methods on route setup time, throughput and load balancing.

关键词： Genetic algorithms

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Three-step three-party quantum secure direct communication

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中国科学（物理学力学天文学） 2018年第9期61卷 26-30页

作者： Shan-Shan Chen Lan Zhou Wei Zhong Yu-Bo Sheng Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China College of Mathematics & Physics Nanjing University of Posts and Telecommunications Nanjing 210003 China Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsMinistry of Education Nanjing 210003 China

We propose a three-party quantum secure direct communication (QSDC) protocol with hyperentanglement in both spatial-mode and polarization degrees of *** secret message can be encoded independently with desired unitary operations in two degrees of *** this protocol,a party can synchronously obtain the other two parties' *** with previous three-party QSDC protocols,our protocol has several ***,the single photons in our protocol are only required to transmit for three *** advantage makes this protocol simple and ***,Alice and Bob can send different secret messages to Charlie,***,with hyperentanglement,this protocol has a higher information capacity than other protocols.

关键词： quantum communication quantum secure direct communication hyperentanglement

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