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International Conference on communications and networking in China (CHINACOM)

作者： Yuexing Peng George C. Alexandropoulos Peng Wang Yonghui Li Dac-Binh Ha Key Lab of Universal Wireless Communication Beijing University of Posts and Telecommunications Beijing China Broadband Wireless and Sensor Network Group Athens Information Technology Peania Greece Centre of Excellence in Telecommunications University of Sydney Sydney Australia Institute of Research and Development Duy Tan University Danang Vietnam

One of the basic problems in cryptography is the generation of a common secret key between two legitimate parties in order to prevent eavesdropping. In this paper, we develop an information-theoretic secret key generation method that exploits the physical layer properties of the multipath channel in orthogonal frequency division multiplexing (OFDM) systems with time division duplexing (TDD), and in particular the amplitude and phase of the estimated channel frequency response (CFR). Both the fast space decorrelation and the independency of the amplitude and phase of the multipath fading channel are used to generate the secret key, leading to increased secrecy bit rate and negligible secrecy leakage. The effect of the channel estimation error, delay and mobility are investigated for the presented method. Simulation results corroborate the increased performance of the proposed method over existing ones.

关键词： wireless communication Security OFDM Fading communication system security Indexes Channel estimation

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JOINT LLR-CRC ERROR MITIGATION FOR TWO-WAY ADAPTIVE DENOISE-AND-FORWARD network CODING

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Journal of Electronics(China) 2013年第4期30卷 352-361页

作者： Cheng Yulun Yang Longxiang Jiangsu Key Lab of Wireless Communications Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications

network Coding (NC) brings correlation between the coded signals from different sources, which makes the system more vulnerable to the decode error at relay. Conventional Cyclic Redundancy Code (CRC) has been implemented for error bit detection. However, its error correction is simply ignored. To fully exploit this feature, this paper proposes a novel joint Log-Likelihood Ratio (LLR) CRC error mitigation for NC two way relay channel. Specific thresholds are designed to estimate the error number of data block and identify those which can be recovered if the number is within the error correction scope of CRC. We examine two modes of the thresholds, one based on the average Bit Error Rate (BER) of source-relay link, while the other based on that of instantaneous one. We provide the full analysis for the Pair-wise Error Probability (PEP) performance of the scheme. A variety of numerical results are presented to reveal the superiority of the proposed scheme to conventional CRC NC under independent Rayleigh fading channels. Moreover, the efficiencies of the proposed thresholds are also validated.

关键词： network Coding （NC） Log-Likelihood Ratio （LLR） Cyclic Redundancy Code （CRC） Denoise-and-forward Pair-wise Error Probability （PEP）

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Efficient electronic entanglement concentration assisted by single mobile electrons

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Chinese Physics B 2013年第11期22卷 178-182页

作者：盛宇波周澜 Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education College of Mathematics & Physics Nanjing University of Posts and Telecommunications

We present an efficient entanglement concentration protocol （ECP） for mobile electrons with charge detection. This protocol is quite different from other ECPs for one can obtain a maximally entangled pair from a pair of less-entangled state and a single mobile electron with a certain probability. With the help of charge detection, it can be repeated to reach a higher success probability. It also does not need to know the coefficient of the original less-entangled states. All these advantages may make this protocol useful in current distributed quantum information processing.

关键词： quantum communication entanglement entanglement concentration

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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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LLR-AWARE SMART LINK-ADAPTIVE STRATEGY FOR DECODE-AND-FORWARD COOPERATIVE communication

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Journal of Electronics(China) 2013年第2期30卷 175-182页

作者： Cheng Yulun Yang Longxiang Wireless Communications Key Lab of Jiangsu Province Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications

Error propagation seriously degenerate the diversity order of Decode-and-Forward (DF) cooperative communication. To address this problem, a novel Log Likelihood Ratio (LLR)-based Link Adaptive Relaying (LAR) is proposed to promote adaption accuracy at relay. The instantaneous Bit Error Probability (BEP) is calculated according to the LLR of the received signals firstly, then based on it, the equivalent Signal-to-Noise Ratio (SNR) is employed to operate dynamic power scaling by relay. It is theoretically proved that the full diversity order can be attained by the scheme. Besides, the power sensitivity is also analyzed. Simulation results show that the proposed scheme outperform the conventional LAR and can achieve full diversity order. Moreover, its strong adaptation to SNR fluctuation is validated.

关键词： Cooperative communication Adaptive transmission Log Likelihood Ratio (LLR) Diversity order Power efficiency

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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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Optimal entanglement concentration for three-photon W states with parity check measurement

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Chinese Physics B 2013年第2期22卷 97-104页

作者：周澜盛宇波赵生妹 College of Mathematics & Physics Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education National Laboratory of Solid State Microstructures Nanjing University

We present an efficient entanglement concentration protocol（ECP） for the less-entangled W state with some identical conventional polarized single *** the protocol,two of the parties say Alice and Charlie should perform the parity check measurements and they can ultimately obtain the maximally entangled W state with a certain success ***,they can obtain another less-entangled W state,which can be reconcentrated into the maximally entangled W *** iterating this ECP,a high success probability can be *** ECP may be an optimal one and it is useful in current quantum information processing.

关键词： quantum communication entanglement entanglement concentration

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Cooperative Spectrum Sensing with receiver diversity over fading reporting channels

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Journal of Information and Computational Science 2013年第9期10卷 2765-2772页

作者： Yue, Wenjing Yang, Zhen Chen, Zhi Wang, Lei Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China National Mobile Communications Research Laboratory Southeast University Nanjing 210003 China

Cooperative Spectrum Sensing (CSS) is well known that, in the fading environment, it can effectively improve the spectrum sensing performance. However, a common problem in CSS requires that the communication links between the sensing users and the data collector must be reliable. In this paper, by taking into account the error introduced by reporting channel (channels between the data collector and the sensing users), We propose a receive diversity based CSS scheme, which improve spectrum sensing accuracy by reducing the probability of error introduced by fading reporting channel. For proposed methods, the relation between detection probability and false alarm probability is studied and the numerical results are given. By considering error probability over fading channel, our analysis and numerical results verify that compared to traditional CSS with OR-rule, the proposed methods can achieve better sensing performance. Copyright © 2013 Binary Information Press.

关键词： Fading channels

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A NEW PRIVACY-PRESERVING EUCLID-DISTANCE PROTOCOL AND ITS APPLICATIONS IN WSNS

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Journal of Electronics(China) 2013年第2期30卷 190-197页

作者： Chen Ping Ji Yimu Wang Ruchuan Huang Haiping Zhang Dan 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 of Ministry of Education Nanjing University of Posts and Telecommunications

Recently, privacy concerns become an increasingly critical issue. Secure multi-party computation plays an important role in privacy-preserving. Secure multi-party computational geometry is a new field of secure multi-party computation. In this paper, we devote to investigating the solutions to some secure geometric problems in a cooperative environment. The problem is collaboratively computing the Euclid-distance between two private vectors without disclosing the private input to each other. A general privacy-preserving Euclid-distance protocol is firstly presented as a building block and is proved to be secure and efficient in the comparison with the previous methods. And we proposed a new protocol for the application in wireless sensor networks (WSNs), based on the novel Euclid-distance protocol and Density-Based Clustering Protocol (DBCP), so that the nodes from two sides can compute cooperatively to divide them into clusters without disclosing their location information to the opposite side.

关键词： Secure multi-party computation Privacy-preserving Euclid-distance protocol wireless sensor networks (WSNs) Density-Based Clustering Protocol (DBCP)

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Sparse and low-rank matrices recovery from incomplete and noisy measurement

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Journal of Computational Information Systems 2013年第19期9卷 7703-7710页

作者： Yang, Zhenzhen 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

The problem of recovering sparse and low-rank matrices from a given matrix captures many applications. However, this recovery problem is NP-hard and thus not tractable in general. Recently, it has been shown that this NP-hard problem can be well approached via heuristically solving a convex relaxation problem where the ?1-norm and the nuclear norm are used to induce sparse and low-rank structures, respectively. To capture more applications, this paper studies the recovery problem in a more general setting: the matrix is acquired by compressed measurement and the measurement is corrupted by Gaussian noise. The separable structure of the new model enables us to solve the involved subproblems more efficiently by splitting the multipliers function. Hence, an implementable numerical algorithm which called accelerated alternating direction method of multipliers (AADMM) is proposed to solve the novel model. Our experimental results show that AADMM is surprisingly efficient for solving the new recovery model. © 2013 Binary Information Press.

关键词： Recovery

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