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12th European Conference on Antennas and Propagation, EuCAP 2018

作者： Zhang, Weite Tian, Lei Wu, Zhongyuan Zhang, Jianhua Zheng, Yi Cao, Jingmin Key Lab of Universal Wireless Communications Ministry of Education China State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunications Mailbox NO.92 Beijing100876 China China Mobile Research Institude Beijing China National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu Sichuan China

ISBN: (纸本)9781785617911

Rural-macro (RMa) is an important scenario for fifth generation (5G) deployment, and there is a strong diffraction in RMa making it difficult to distinguish between line-of-sight (LoS) and non-line-of-sight (NLoS) case. Since the environmental condition is closely related to the dynamic range of channel impulse response (CIR), this paper studies the dynamic range impact on characteristics of three dimensional (3D) multiple-input multiple-output (MIMO) channels based on 3.5 GHz measurement campaign in RMa. The space-alternating generalized expectation-maximization (SAGE) algorithm is employed to estimate multipath component parameters. The channel statistical characteristics, channel capacity and eigenvalues of CIR matrix are calculated for different CIR dynamic ranges. The results show that the delay spread, the angle spread, the channel capacity and the sub-channel correlation are linearly related to the dynamic range of CIR. Thus, the results give a new perspective to study channel characteristics based on CIR dynamic range in RMa scenario. © 2018 Institution of Engineering and *** Rights Reserved.

关键词： Channel capacity

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Prediction-Based Spectrum Access Optimization in Cognitive Radio Networks

Prediction-Based Spectrum Access Optimization in Cognitive R...

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International Symposium on Personal, Indoor, and Mobile Radio communications

作者： PeiLiang Zuo Xing Wang Wangdan Linghu Rong Sun Tao Peng Wenbo Wang Wireless Signal Processing and Networks Laboratory (WSPN) Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781538660102

Cognitive radio (CR) has received wide attention for enhancing the spectrum utilization. Spectrum prediction can be fully utilized in both time and frequency domains for cognitive access. In this paper, Long Short-Term Memory (LSTM) networks method is adopted for spectrum prediction. Based on prediction of the power of future time slots, the method can help to achieve spectrum utilization flexibility by calculating throughput of shared channels. A new spectrum access strategy, which integrates optimal spectrum sensing interval in time domain and channel selection based on the presented LSTM networks method in frequency domain, is proposed. In particular, for multiple channels of the shared spectrum, the optimal sensing interval of each channel is calculated, which is then adopted as the reference output length of the LSTM networks method, with predicted results, a feedback which consists of a preferred channel list will be conducted for spectrum access. With both real-life and generated data, the proposed LSTM networks method is verified, which outperforms commonly used Neural Network (NN) and Hidden Markov Model (HMM) methods. Numerical results also show that the proposed spectrum access strategy is capable of increasing throughput of the cognitive system and reducing energy consumption of spectrum sensing significantly.

关键词： CR LSTM HMM

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A Game Theory Scheme Combined with the Interference Region in Cellular D2D Heterogeneous Networks

A Game Theory Scheme Combined with the Interference Region i...

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IEEE International Conference on communications in China Workshops (ICCC)

作者： Tingting Zhong Tao Peng Yating Zhang Wireless Signal Processing and Networks Laboratory (WSPN) Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781538670125;9781538670118

The cellular D2D heterogeneous network takes advantage of proximity gain and hop gain of D2D communication, which can greatly improve the performance of the entire network. The actual network imposes an ultra-reliable and low-latency requirement for communications. Therefore, this paper proposes a set of joint power control and resource allocation distributed solutions. It consists of two parts. In order to guarantee the quality-of-service (QoS) of cellular primary users and scheduled D2D users, the pricing-based game scheme is used. In order to achieve the low-latency requirement, the link scheduling scheme based on the interference graph matrix within the D2D network is proposed. Simulations have shown that compared with the pure game theory scheme, this scheme can significantly reduce delay and thus achieve ultra-reliable and low-latency requirements.

关键词： Device-to-device communication Interference Games Scheduling Convergence Quality of service Game theory

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Comparative channel study of ray tracing and measurement for an indoor scenario at 28 GHz 12

Comparative channel study of ray tracing and measurement for...

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12th European Conference on Antennas and Propagation, EuCAP 2018

作者： Zhan, Jinnan Zhang, Jianhua Tian, Lei Zhang, Xinzhuang Tang, Pan Dou, Jianwu Wei, Hewen Key Lab of Universal Wireless Communications Ministry of Education New Zealand State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunications Mailbox NO.92 Beijing100876 China Wireless Algorithm Department Product R and D system ZTE Corp. Ltd. Shanghai201210 China National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu Sichuan610041 China

ISBN: (纸本)9781785617911

The millimeter wave communication is important for future wireless systems. In this paper, the channel characteristics at 28 GHz in an indoor scenario are researched based on ray tracing (RT) simulation and measurement. In the RT simulation, various configurations, such as different number of reflections, diffractions and penetrations are used. As for the measurement, two setups are implemented in order to analyze more parameters. Setup one is that biconical antennas are used at both the transmitter (TX) and receiver (RX). The other setup is that horn antenna at RX is rotated 360◦ in azimuth with a step of 5◦ when an omni-directional antenna located at TX. Meanwhile, antenna is rotated one circle with an elevation angle of 10◦, 0◦ and -10◦, respectively. Path loss and K-factor are analyzed firstly, and analysis results indicate the RT result with 1 or 2 reflections, 1 diffractions and 5 penetrations in this conference room is closest to the measurement result and channel models in 3GPP TR 38.901. Then, the root mean square (RMS) delay spread and RMS angular spread are investigated, which shows the value of measurement is a bit larger than RT because of the limitation of azimuth and elevation step. According to all the results, 1-2 reflections, 1 diffraction and 5 penetrations can be used in RT for future analysis of indoor scenario at 28 GHz. © Institution of Engineering and *** Rights Reserved.

关键词： Ray tracing

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Deep Learning Enabled Dynamic Reactive Video Caching in Mobile Edge Networks

Deep Learning Enabled Dynamic Reactive Video Caching in Mobi...

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International Conference on communication Systems

作者： Chuanhao Sun Jizhe Zhou Xiang Zhou Xing Zhang Wenbo Wang Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Post and Telecommunications Beijing P.R. China

ISBN: (纸本)9781538678657;9781538678640

The dynamic video streaming adaption and caching has been widely adopted in the proposals of future network, fulfilling the ever-increasing demand for seamless high-definition video transmission. Generally, the mobile video is transmitted in a two-stage wireless-wired hybrid link. There are totally different features in two stages, leading to a cask effect. Fortunately, the emergence of mobile edge computing (MEC) enables an intelligent interaction between these two stages. Moreover, the emergence of deep learning provides a new way to enhance the performance of such system, with higher flexibility and intelligence. Here, we propose an Deep learning enabled dynamic reactive video caching scheme deployed in MEC server. In this scheme, the caching server improves the utilization efficiency of the backhaul while MEC-based video quality adaption is used to adapt the rate to time-varying wireless channel. Deep Q-learning is also introduced to optimize the quality of experience (QoE) of the mobile video service in an intelligent way. Based on our simulation, the proposed scheme outperforms existing schemes with higher quality and stability in mobile video service.

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Design and Analysis of Cooperative Multicast-Unicast Transmission Scheme in Hybrid Satellite-Terrestrial Networks

Design and Analysis of Cooperative Multicast-Unicast Transmi...

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International Conference on communication Systems

作者： Liangjingrong Liu Jiaxin Zhang Xing Zhang Peng Wang Yuanjun Wang Le Ouyang Wireless Signal Processing & Networks Lab (WSPN) Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781538678657;9781538678640

The rapid development of the mobile Internet results in the explosive increase of content demands. In order to improve the efficiency of content delivery, the mobile edge computing (MEC) has been widely explored. Meanwhile, as the hybrid satellite-terrestrial network gradually becomes the trend of next-generation mobile communication, the terrestrial backhaul load is expected to be relieved. However, existing works do not take into account the exploitable potential of a benign combination of the user preference characteristics and evolving satellite processing capabilities, thus we proposed hybrid satellite-terrestrial double-edge networks (HSTDEN), promoting the collaboration between satellite MEC (S-MEC) and the terrestrial MEC (T-MEC). Besides, a novel cooperative multicast-unicast transmission (CMUT) scheme is proposed. Multicast can efficiently serve popular requests, while unicast is targeted at personalized requests to avoid them being never served. Finally, a system-level OPNET platform is built to analyze the performance of proposed scheme. Numerical results show that our proposed CMUT scheme has advantages in relieving terrestrial backhaul load, especially in the scenarios where content convergence is high.

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Implementation of Digital Image Encryption Algorithm Based on DNA Coding and Chaos Theory

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IOP Conference Series: Materials Science and Engineering 2020年第7期768卷

作者： Denghui Li Yanhong Wang Institute of Information Technology of GUET Guilin China Guangxi Key Lab of Wireless Wideband Communication &Signal Processing Guilin China Key Laboratory of Cognitive Radio and Information Processing Ministry of Education (Guilin University of Electronic Technology) GUET Guilin China

Because of the large amount of data and high redundancy, digital image can not be encrypted by traditional methods. The method based on DNA and chaos theory can be used for image encryption. The experimental results show that the gray value of the image after encryption is randomly and evenly distributed, which directly loses the features of the original image. The histogram is balanced, the correlation between adjacent pixels is low, and the information entropy is close to the ideal value, which shows a good anti cracking ability and can restore the image well.

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A novel clustering method based on density peaks and its validation by channel measurement 12

A novel clustering method based on density peaks and its val...

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12th European Conference on Antennas and Propagation, EuCAP 2018

作者： Xue, Hanqing Tian, Lei Zhang, Yuxiang Wang, Chao Zhang, Jianhua Li, Wei Wei, Hewen Key Lab of Universal Wireless Communications Ministry of Education China State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunications P. O. Box 92 Beijing100876 China Department of Electrical Engineering Northern Illinois University DeKalbIL60115 United States National key laboratory of science and technology on blind signal processing Chengdu Sichuan610041 China

ISBN: (纸本)9781785617911

In this paper, cluster centers are defined as local maxima in the density which is called density peaks. We use an algorithm based on density peaks to cluster multipath components (MPCs) whose parameters are estimated by the space-alternating generalized expectation-maximization (SAGE) algorithm. To validate its performance, we apply it to the data from a channel measurement in an indoor scenario at 28 GHz and compare it to the widely used KPowerMeans algorithm with the same distance metric of multiple component distance (MCD). Through the results, we find it can cluster MPCs more accurately validated by Calinski-Harabasz (CH) and Davies-Bouldin (DB) indices. More importantly, it overcomes the shortcoming of setting the number of clusters manually because we can determine the cluster centers automatically. Besides, the efficiency of DP clustering is far superior to KPowerMeans because what it needs is only a distance matrix and we only need to compute it once. At the end, statistical analysis of clusters are presented to provide insights in channel modeling of millimeter wave. © Institution of Engineering and *** Rights Reserved.

关键词： Millimeter waves

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Heralded amplification of single-photon entanglement with polarization feature

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Frontiers of physics 2018年第5期13卷 241-249页

作者： Yu-Yu Jin Sheng-Xian Qin Hao Zu Lan Zhou Wei Zhong Yu-Bo Sheng School of Science Nanjing University of Posts and Telecommunications Nanjing 210003 China New Energy Technology Engineering Laboratory of Jiangsu Province 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 Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China

Heralded noiseless amplification is beneficial in overcoming transmission photon loss in a noisy quantum channel. We propose a single-photon-assisted heralded noiseless amplification protocol of the single- photon entanglement （SPE）, where the single-photon qubit has an arbitrary unknown polarization feature. We focus on both the complete and partial photon loss during the transmission process. After the amplification, the parties can recover the pure less-entangled SPE into a maximally entangled SPE and increase its fidelity. Moreover, the polarization feature of the single-photon qubit will be well preserved and not be leaked. Our protocol can be realized under our current experimental condition. Based on the features above, our protocol may be useful in the quantum secure communication schemes that encode information in the polarization degree of freedom of photons.

关键词： quantum communication single-photon entanglement quantum state amplification polarization feature

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Upper Bound of Collective Attacks on Quantum key Distribution

arXiv

引用

arXiv 2019年

作者： Li, Wei Zhao, Shengmei Nanjing University of Posts and Telecommunications Institute of Signal Processing and Transmission Nanjing210003 China Nanjing University of Posts and Telecommunications Key Lab Broadband Wireless Communication and Sensor Network Ministy of Education Nanjing210003 China National Laboratory of Solid State Microstructures Nanjing University Nanjing210093 China

Evaluating the theoretical limit of the amount of information Eve can steal from a quantum key distribution protocol under given conditions is one of the most important things that need to be done in security proof. In addition to source loopholes and detection loopholes, channel attacks are considered to be the main ways of information leakage, while collective attacks are considered to be the most powerful active channel attacks. Here we deduce in detail the capability limit of Eve’s collective attack, the most powerful attack scheme in channel attacks, in non-entangled quantum key distribution, like BB84 and measurement-device-independent protocols, and entangled quantum key distribution, like device-independent protocol, in which collective attack is composed of quantum weak measurement and quantum unambiguous state discrimination detection. The theoretical results show that collective attacks are equivalent in entangled and non-entangled quantum key distribution protocols. We also find that compared with the loose bond on Eve’s attack provided by security proof based on entanglement purification, the security proof against collective attacks not only improves the system’s tolerable bit error rate, but also improves the key rate. Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum cryptography

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