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arXiv 2018年

作者： Geng, Yong Huang, Xiatao Cui, Wenwen Ling, Yun Xu, Bo Zhang, Jin Yi, Xingwen Wu, Baojian Huang, Shu-Wei Qiu, Kun Wong, Chee Wei Zhou, Heng Key Lab of Optical Fiber Sensing and Communication Networks School of Information and Communication Engineering University of Electronic Science and Technology of China Chengdu611731 China Department of Electrical Computer and Energy Engineering University of Colorado BoulderCO80309 United States Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of California Los AngelesCA90095 United States

We demonstrate seamless channel multiplexing and high bitrate superchannel transmission of coherent optical orthogonal-frequency-division-multiplexing (CO-OFDM) data signals utilizing a dissipative Kerr soliton (DKS) frequency comb generated in an on-chip microcavity. Aided by comb line multiplication through Nyquist pulse modulation, the high stability and mutual coherence among mode-locked Kerr comb lines are exploited for the first time to eliminate the guard intervals between communication channels and achieve full spectral density bandwidth utilization. Spectral efficiency as high as 2.625 bit/Hz/s is obtained for 180 CO-OFDM bands encoded with 12.75 Gbaud 8-QAM data, adding up to total bitrate of 6.885 Tb/s within 2.295 THz frequency comb bandwidth. Our study confirms that high coherence is the key superiority of Kerr soliton frequency combs over independent laser diodes, as a multi-spectral coherent laser source for high-bandwidth high-spectral-density transmission networks. Copyright © 2018, The Authors. All rights reserved.

关键词： Spectral density

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5G ENTERING INTO A NEW ERA

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China communications 2017年第12期14卷 I0002-I0004页

作者： Feifei Gao Changle Li Jun Fang Kaizhi Huang Zhi Quan Chengwen Xing Jianhua Zhang Zhongshan Zhang Liqiang Zhao Yulong Zou Department of Automation Tsinqhua UniversityBeiiingChina the State Key Laboratory of Integrated Services Networks Xidian University china communications ieee communications magazine ieee signal processing letters national digital switching system engineering&technological research center the college of information engineering shenzhen university the school of information and electronics beijing institute of technology bupt itu-r imt-2020 channel model ieee comm the school of computer and communication engineering in the university of science and technology beijing(ustb) state key lab.of integrated ser vice networks xidian university the nanjing university of posts and telecommunications(nupt)

The ever increasing wireless data services, such asimaging, video, audio, multimedia, etc., have de-mands for the very high speed wireless communicationsand network, which are unfortunately a bottleneck whencombining with the wireline core network. Users＇ arenow expecting high quality of experience with low-costdevices, ubiquitous connectivity, energy efficiency, highreliability, or even ultra-low latency if a vehicle terminalis applied.

关键词： 5G ENTERING A NEW ERA

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RT_Vivaldi: A Symmetric & Equality RTT Prediction Algorithm in networks

RT_Vivaldi: A Symmetric & Equality RTT Prediction Algorithm ...

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International Conference on Control Systems and computer Science (CSCS)

作者： Huijun Dai Zhaosheng Dai Xiaolin Gui Min Zhu Kuncai Zhong Shuming Liu Shaanxi Key lab of Computer Networks Xi'an Jiaotong University Shaanxi Shaanxi P R.Chian Suzhou Academy Xi'an Jiaotong University Shaanxi Shaanxi P R.Chian School of Electronics and Communication Engineering

ISBN: (纸本)9781538618400

Predicting network round-trip times (RTT) between nodes is difficult because of the asymmetric and unequal network features. The phenomenon of Triangle Inequality Violation (TIV) can seriously affect the results in prediction. The traditional Vivaldi algorithm has a low accuracy and an unsteady convergence rate. In this paper, a novel Restrained TIV Vivaldi (RT_Vivaldi) algorithm is proposed. Firstly, the TIV is analyzed to set a triangle detection and suppression coefficient. The coefficient is defined to correct the asymmetric and unequal influence on the TIV. Multiple reference neighbor nodes are set based on the distances between them and then dynamically update the parameters to eliminate the effects of the links with the various lengths. Finally, simulations have proven that the proposed RT_Vivaldi algorithm has a higher accuracy and a greater stability than those traditional algorithms.

关键词： Prediction algorithms Delays Heuristic algorithms Internet Springs Convergence Benchmark testing

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The hybrid encryption algorithm of lightweight data in cloud storage

The hybrid encryption algorithm of lightweight data in cloud...

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International Symposium on Agents, Multi-Agent Systems and Robotics (ISAMSR)

作者： Chengliang Liang Ning Ye Reza Malekian Ruchuan Wang College of Computer Nanjing University of Posts and Telecommunications Nanjing China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing China Department of Electrical Electronic and Computer Engineering University of Pretoria Pretoria South Africa Key Lab of Broadband Wireless Communication and Sensor Network Nanjing University of Post and Telecommunications Nanjing China

In this paper, we proposed a hybrid encryption algorithm in order to solve the security problems on lightweight data on the cloud storage service. This paper first improves the RSA algorithm in the cloud environment by increasing the length of the RSA key to an extent that it can quickly generate big primes. Then, we merge AES and RSA algorithms on the basis of the improved RSA algorithm. This is called a hybrid encryption algorithm which is suitable for security of the lightweight data in cloud storage environment in order to further enhance the confidentiality of data in the cloud. The experimental result shows that the hybrid encryption algorithm has advantages of fast encryption and decryption, more secure, and it is also able to settle the security problems of users' lightweight data in a certain extent.

关键词： Encryption Cloud computing Algorithm design and analysis Public key Access control

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5G entering into a new era [Guest Editorial]

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China communications 2017年第12期14卷 iv-vi页

作者： Feifei Gao Changle Li Jun Fang Kaizhi Huang Zhi Quan Chengwen Xing Jianhua Zhang Zhongshan Zhang Liqiang Zhao Yulong Zou Department of Automation Tsinghua University Beijing China State Key Laboratory of Integrated Services Networks Xidian University University of Eletronic Science and Technology of China National Digital Switching System Engineering & Technological Research Center Zhengzhou China College of Information Engineering Shenzhen University School of Information and Electronics Beijing Institute of Technology Beijing University of Posts and Telecommunication School of Computer and Communication Engineering in the University of Science and Technology Beijing State Key Lab. of Integrated Service Networks Xidian University Nanjing University of Posts and Telecommunications (NUPT) Nanjing China

The ever increasing wireless data services, such as imaging, video, audio, multimedia, etc., have demands for the very high speed wireless communications and network, which are unfortunately a bottleneck when combining with the wireline core network. Users' are now expecting high quality of experience with low-cost devices, ubiquitous connectivity, energy efficiency, high reliability, or even ultra-low latency if a vehicle terminal is applied.

关键词：

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Five-partite entanglement generation in a high-Q microresonator

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Physical Review A 2015年第4期91卷 042311-042311页

作者： Yutian Wen Xufei Wu Rongyu Li Qiang Lin Guangqiang He State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Electrical and Computer Engineering University of Rochester New York 14627 USA

We propose to produce five-partite entanglement via cascaded four-wave mixing in a high-Q microresonator that may become a key to future one-way quantum computation on chip. A theoretical model is presented for the underlying continuous-variable entanglement among the generated comb modes that is expansible to more complicated scenarios. We analyze the entanglement condition when the van Loock and Furusawa criteria are violated and discuss the device parameters for potential experimental realization that may be utilized to build an integrated compact five-partite entanglement generator. The proposed approach exhibits great potential for future large-scale integrated full optical quantum computation on chip.

关键词： MICRORESONATORS (Optoelectronics) COMB filters QUANTUM computing QUANTUM systems QUANTUM states

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A multi-path forwarding strategy for content-centric networking

A multi-path forwarding strategy for content-centric network...

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IEEE International Conference on communications in China (ICCC)

作者： Guanghui Zhang Hui Li Tingting Zhang Dagang Li Li Xu School of Electronic & Computer Engineering Peking University Shenzhen China Engineering Lab of Converged Networks Technology Shenzhen China Communication Engineering Research Center Harbin Institute of Technology Shenzhen China

Content-Centric Networking (CCN) is a new networking paradigm to resolve the data traffic explosive problem of the Internet caused by a rapid increase in file sharing and video streaming traffic. Instead of seeking a single best path in the IP network, CCN is able to employ multipath to deliver packets. The conventionally adopted CCN forwarding strategies, such as taking advantage of replication of Interests or the shortest path do not offer satisfying performance under high-bandwidth requirements. In this paper, we present a Luby Transform (LT) code aided multipath forwarding strategy (LTCA-MF), which aims at reducing data downloading time and improving load balance in forwarding by transmitting LT coded contents on multiple disjoint paths. Tested by a large-scale network simulation scenario, our LTCA-MF strategy achieves excellent performance with desirable reliability and feasibility in comparison to others.

关键词： Servers Routing Greedy algorithms IP networks Complexity theory Decoding Encoding

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A weighted hard combination scheme for cooperative spectrum sensing in cognitive radio sensor networks

A weighted hard combination scheme for cooperative spectrum ...

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IEEE International Conference on Telecommunications and Malaysia communications (ICT-MICC)

作者： I. Mustapha Borhanuddin M. Ali Mohd F. A. Rasid A. Sali H. Mohamad Department of Computer and Communication System Engineering Universiti Putra Malaysia Serdang Selangor Malaysia Wireless Networks and Protocol Research Lab MIMOS Berhad Technology Park Malaysia Kuala Lumpur Malaysia

Multi-user spatial sensing diversity exploration through cooperation spectrum sensing greatly improves sensing performance. However, high communication overhead and energy costs for exchanging sensing results may limit its viability in a realistic large scale resource constraint network such as cognitive radio wireless sensor networks. This paper presents a Weighted Hard Combination (WHC) scheme that combines features of both quantized and hard combining schemes to minimize energy cost for reporting sensing result and improve primary user detection performance in cooperative sensing. We evaluate the effectiveness of the scheme through simulation. Performance comparison of the WHC scheme in terms of detection performance, reporting energy cost and reporting time ratio with conventional hard combination, soft combination and quantized schemes indicates viability of the scheme. The results indicate that the WHC scheme minimizes reporting energy cost by 70% and improves detection performance by 5.6% compared to the quantized 3-bits scheme.

关键词： Sensors Cognitive radio Wireless sensor networks Diversity reception Signal to noise ratio Interference

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Performance analysis of two-hop-relay cellular systems with queueing capability

Performance analysis of two-hop-relay cellular systems with ...

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2015 International Conference on Information and communications Technologies, ICT 2015

作者： Lu, Weifeng Gu, Mengmeng Yang, Luxi College of Computer Nanjing University of Posts and Telecommunications Nanjing210023 China School of Information Science and Engineering SouthEast University Nanjing210096 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing Jiangsu210023 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing Jiangsu210023 China

ISBN: (纸本)9781849199940

In this paper, we present a two-hop-relay WCDMA cellular system with queueing capability, where a call can wait in the incoming buffer at the congested Base Transceiver Station (BTS) if no channel is immediately available, so as to reduce the call blocking rate. We develop an analytic model based on Multidimensional Markov chains. Then based on this model, we can obtain the average transmission rate and the queuing delay performance of the system respectively. Finally, through numerical calculation, we analyze the impact of the various parameters on the performance of the two-hop-relay WCDMA cellular system with queueing capability.

关键词： Queueing theory

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A QoS-aware routing algorithm based on ant-cluster in wireless multimedia sensor networks

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Science China(Information Sciences) 2014年第10期57卷 77-92页

作者： HUANG HaiPing CAO Xiao WANG RuChuan WEN YongGang 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 School of Computer Engineering Nanyang Technological University

QoS-aware routing algorithm is important in wireless multimedia sensor networks. This paper formulates a generalized QoS-aware routing model on the basis of multiple routing metrics and priorities of packets. We first introduce a 2D plain-based routing algorithm IPACR which improves the standard ant colony algorithm by optimizing the initial distribution of artificial pheromone in order to accelerate the algorithm convergence rate. Then a clustering-based routing algorithm ICACR is presented which can be well applied in a large scale network. ICACR is a variation of IPACR because it can be suitable for clustering cases to satisfy the larger scale situations. Both the numerical algorithm performance analysis and simulation of IPACR and ICACR are given. The results show that ICACR outperforms IPACR in terms of both network lifetime and QoS-aware routing metrics in large scale wireless multimedia sensor networks. Moreover, the simulation based on the real video traces shows that by extending the multi-path to ICACR for different priorities of video frames better performance can be achieved.

关键词： ant colony clustering-based multi-path QoS-aware routing algorithm wireless multimedia sensor networks

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