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arXiv 2020年

作者： Yan, Yu-Fei Zhou, Lan Zhong, Wei Sheng, Yu-Bo Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Nanjing210003 China Schoool of Science 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

Measurement-device-independent quantum key distribution (MDI-QKD) provides us a powerful approach to resist all attacks at detection side. Besides the unconditional security, people also seek for high key generation rate, but MDI-QKD has relatively low key generation rate. In this paper, we provide an efficient approach to increase the key generation rate of MDI-QKD by adopting multiple degrees of freedom (DOFs) of single photons to generate keys. Compared with other high-dimension MDI-QKD protocols encoding in one DOF, our protocol is more flexible, for our protocol generating keys in independent subsystems and the detection failure or error in a DOF not affecting the information encoding in other DOFs. Based on above features, our MDI-QKD protocol may have potential application in future quantum communication field. Copyright © 2020, The Authors. All rights reserved.

关键词： Quantum cryptography

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First-order-reflection MIMO channel model for 60 GHz NLOS indoor WLAN systems

First-order-reflection MIMO channel model for 60 GHz NLOS in...

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International Conference on communication Systems

作者： Lei Wang Jianxin Chen Xin Wei Jingwu Cui Baoyu Zheng National Mobile Comm. Research Laboratory Southeast University Nanjing China Ministry of Education Key Lab of Broadband Wireless Comm. and Sensor Network Technology (Nanjing University of Posts & Telecomm.) Nanjing China

ISBN: (纸本)9781479958337

wireless communications employing 60 GHz millimeter wave are quite attractive recently due to the huge clean unlicensed bandwidth (up to 7 GHz) in this frequency band. In this paper, aiming at increasing channel capacity and improving the reliability of non-line-of-sight (NLOS) indoor wireless communications, we focus on a first-order-reflection multiple input multiple output (MIMO) model for 60 GHz wireless local area network (WLAN) systems based on the short-range indoor scenario provided by IEEE Std 802.11ad. Considering the special physical properties of 60 GHz millimeter wave in such scenario, we use large scale planar antenna arrays at both transmitter and receiver to eliminate link level interference. The antenna arrays are divided into several sub-arrays and each sub-array is considered as a high-gain steerable directional antenna unit. The essential characteristics of the physical layer of this model is to adjust these antenna units along different first-order-reflection clusters from walls or ceiling simultaneously at both transmitter and receiver to get several parallel channel links. System level simulation results demonstrate that the proposed model with multiple first-order-reflection links can increase the channel capacity for several times compared to the original model in this scenario.

关键词： MIMO Antenna arrays Signal to noise ratio wireless communication Interference IEEE standards Receivers

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When Digital Twin Meets 6G: Concepts, Obstacles, and Research Prospects

arXiv

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arXiv 2024年

作者： Liu, Wenshuai Fu, Yaru Shi, Zheng Wang, Hong The School of Science and Technology Hong Kong Metropolitan University 999077 Hong Kong The School of Intelligent Systems Science and Engineering Jinan University Zhuhai519070 China The Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing210003 China

The convergence of digital twin technology and the emerging 6G network presents both challenges and numerous research opportunities. This article explores the potential synergies between digital twin and 6G, highlighting the key challenges and proposing fundamental principles for their integration. We discuss the unique requirements and capabilities of digital twin in the context of 6G networks, such as sustainable deployment, real-time synchronization, seamless migration, predictive analytic, and closed-loop control. Furthermore, we identify research opportunities for leveraging digital twin and artificial intelligence to enhance various aspects of 6G, including network optimization, resource allocation, security, and intelligent service provisioning. This article aims to stimulate further research and innovation at the intersection of digital twin and 6G, paving the way for transformative applications and services in the future. Copyright © 2024, The Authors. All rights reserved.

关键词： Resource allocation

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Biased decoy-state reference-frame-independent quantum key distribution

arXiv

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arXiv 2017年

作者： Zhu, Jian-Rong Zhang, Chun-Mei Guo, Guang-Can Wang, Qin 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 Key Laboratory of Quantum Information CAS University of Science and Technology of China Hefei230026 China

Without actively aligning the reference frames, the reference-frame-independent quantum key distribution (RFI-QKD) can generate secure keys even when the reference frames drift slowly. Here, we propose a new scheme on the decoy-state RFI-QKD, where the basis assignments of two legitimate parties are biased, reducing the fraction of mismatched-basis data. When accounting for statistical fluctuations under different misalignments of reference frames, we investigate the performance of biased decoy-state RFI-QKD with full parameter optimization. We also make a clear comparison between the new scheme with other practical schemes, e.g., unbiased decoy-state RFI-QKD and biased decoy-state BB84-QKD. Simulation results demonstrate that the new proposed biased decoy-state RFI-QKD can significantly improve the performance (secret key rate and secure transmission distance) of practical QKD systems. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum cryptography

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Quantum key distribution with the single-photon-added coherent source

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Physical Review A 2014年第6期90卷 062315-062315页

作者： Dong Wang Mo Li Feng Zhu Zhen-Qiang Yin Wei Chen Zheng-Fu Han Guang-Can Guo Qin Wang Key Laboratory of Quantum Information University of Science and Technology of China CAS Hefei Anhui 230026 China Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

In this paper, we present schemes on implementing the single-photon-added coherent source in quantum key distributions. We apply this source in either the standard BB84 protocol or the recently proposed measurement-device-independent quantum key distribution, comparing their performance with the cases of using other existing sources, e.g., the weak coherent source or the heralded single-photon source, and giving out corresponding numerical simulations. Our simulation results show that in both protocols the single-photon-added coherent source can greatly exceed all other existing sources. Moreover, even when taking statistical fluctuation into account, a high key generation rate can still be achieved at long distance by applying this source.

关键词： SINGLE photon generation QUANTUM measurement COHERENT scattering QUANTUM communication (Optics) QUANTUM states

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A distributed compressed sensing approach for speech signal denoising

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Journal of Electronics 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 and Telecommunications Nanjing 210003 China Nanjing University of Posts and Telecommunications Nanjing 210006 No. 66 Xinmofan Road P. O. Box 214 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 reconstruction. The precondition of compressed sensing theory is the sparsity of signals. In this paper, two methods to estimate the sparsity level of the signal are formulated. And then an approach to estimate the sparsity level directly from the noisy signal is presented. Moreover, 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) algorithm. Several simulation results demonstrate the accuracy of the estimated sparsity level and that this denoising system for noisy speech signals can achieve favorable performance especially when speech signals suffer severe noise. © 2011 Science Press, Institute of Electronics, CAS and Springer-Verlag Berlin Heidelberg.

关键词： Denoising Distributed compressed sensing Sparsity estimation Speech signal

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Certifying quantum teleportation experimentally

Quantum Engineering

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Quantum Engineering 2019年第3期1卷

作者： Sheng, Yu-Bo Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Nanjing China School of Science Nanjing University of Posts and Telecommunications Nanjing China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing China

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Two-way denoise-and-forward network coding opportunistic relaying aiming at minimizing euclidean distance in multi-access phase

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Journal of Electronics 2011年第4期28卷 433-443页

作者： Jia, Xiangdong Yang, Longxiang Shao, Shixiang Wireless Communications Key Lab of Jiangsu Province 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 and Telecommunications Nanjing 210003 China College of Mathematics and Information Science Northwest Normal University Lanzhou 730070 China Nanjing University of Posts and Telecommunications Nanjing 210003 Box 188 No. 66 Xinmofan Road China

To exploit the effect of modulation schemes on the best relay selection, a novel Jointing Modulation schemes max-min criterion (JM-max-min) is proposed firstly for Two-Way De-Noise-and-Forward (DNF) Opportunistic Relaying systems (TW-DNF-OR) by aiming at minimizing the Pairwise Error Probability (PEP) of Multi-Access (MA) phase which dominates the error performance of TW-DNF-OR due to the presence of MA interference. The proposed JM-max-min criterion integrates perfectly the minimum distances of constellations and the relay links gains. Then, with the proposed JM-max-min criterion, we analyze the Symbol Error Probabilities (SEPs) of MA phase and BroadCast (BC) phase by using the approximated mathematics analysis, and present the corresponding closed-form expressions to SEPs. The numerical analysis shows, for a given modulations combination at both sources, the TW-DNF-OR systems with the proposed JM-max-min criterion outperform the one with the conventional max-min criterion. © 2011 Science Press, Institute of Electronics, CAS and Springer-Verlag Berlin Heidelberg.

关键词： Cooperative communications Max-min criterion network coding Opportunistic relaying

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Performance analysis of data aggregation algorithms in wireless sensor networks

Performance analysis of data aggregation algorithms in wirel...

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International Conference on Electrical and Control Engineering (ICECE)

作者： Jian Xu Geng Yang Zheng-yu Chen Lei Chen Zhen Yang Key Laboratory of Broadband Wireless Communication & Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing Jiangsu China Nanjing University of Posts and Telecommunications Nanjing CN College of Computer Science & Technology Nanjing University of Posts and Telecommunications Nanjing Jiangsu China

Resource-constrained is a critical issue in wireless sensor networks (WSN) applications. Data aggregation (or data fusion) is one of the key techniques to solve the problem. Data aggregation can effectively reduce the data traffic, thereby reduce energy consumption, and extend the network's survival time. The research of data aggregation relates to many aspects of technology, so that the design of efficient data aggregation algorithm is a challenging task. In this paper, we investigate the effect of essential operations, scheduling algorithm and aggregation tree construction, has on data aggregation performance. The main performance such as end-to-end delay and energy-consumption of different aggregation schemes has been studied and measured by simulation experiment.

关键词： wireless sensor networks Delay Energy consumption Scheduling algorithm Algorithm design and analysis Approximation algorithms Distributed databases

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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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