检索结果-内蒙古大学图书馆

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

来源：评论

学校读者我要写书评

暂无评论

An Expressive, Lightweight and Secure Construction of key Policy Attribute-Based Cloud Data Sharing Access Control

引用

Journal of Physics: Conference Series 2017年第1期910卷

作者： Guofen Lin Hanshu Hong Yunhao Xia Zhixin Sun The Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing China

Attribute-based encryption (ABE) is an interesting cryptographic technique for flexible cloud data sharing access control. However, some open challenges hinder its practical application. In previous schemes, all attributes are considered as in the same status while they are not in most of practical scenarios. Meanwhile, the size of access policy increases dramatically with the raise of its expressiveness complexity. In addition, current research hardly notices that mobile front-end devices, such as smartphones, are poor in computational performance while too much bilinear pairing computation is needed for ABE. In this paper, we propose a key-policy weighted attribute-based encryption without bilinear pairing computation (KP-WABE-WB) for secure cloud data sharing access control. A simple weighted mechanism is presented to describe different importance of each attribute. We introduce a novel construction of ABE without executing any bilinear pairing computation. Compared to previous schemes, our scheme has a better performance in expressiveness of access policy and computational efficiency.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A TDMA Based Cooperative Communication MAC Protocol for Vehicular Ad Hoc networks

A TDMA Based Cooperative Communication MAC Protocol for Vehi...

引用

IEEE Vehicular technology Conference

作者： Tianjiao Zhang Qi Zhu Jiangsu Key Lab of Wireless Communications Key Lab on Wideband Wireless Communications and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781509016990

In a VANET (Vehicular Ad Hoc network), the collisions caused by vehicles' mobility lead to poor network performance, especially in high-density network. In order to increase the flexibility of communication, this paper presents a communication protocol with dynamic choosing relay node and automatic cooperative communication called VC-TDMA (Vehicular Cooperative TDMA). The nodes can choose the multi-hop relay nodes rationally and other idle nodes can provide cooperative communication automatically. Considering batch arrival data traffic, the buffer queue state of nodes in the network is numerical analyzed by Markov Chain. The simulation results show that VC-TDMA can improve the throughput of the network compared with the conventional TDMA protocol.

关键词： VANETs Markov Chain Cooperative Communication TDMA time division multiple access Markov chain cooperative communication V2V Communication protocols Ganglia Trunk Node network node Simulation results

来源：评论

学校读者我要写书评

暂无评论

PRIVACY-PRESERVING K-NN COMPUTATION OVER ENCRYPTED CLOUD DATA WITHOUT key SHARING

PRIVACY-PRESERVING K-NN COMPUTATION OVER ENCRYPTED CLOUD DAT...

引用

2016 4th IEEE International Conference on Cloud Computing and Intelligence Systems（IEEE CCIS2016）

作者： ShaoHui Wang Tian Liu Fu Xiao Ruchuan Wang 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

ISBN: (纸本)9781509012572

As a frequently used query operation for online applications,secure k-nearest neighbors(k-NN)computation on encrypted cloud data has received much *** this paper,we focus on the problem of supporting efficient k-NN computation over encrypted cloud data while data owner cannot share his secret keys with query *** give a security analysis of the scheme proposed by Zhu et al.[16],and the analysis shows the scheme cannot provide query privacy at *** we design a new efficient construction to support efficient k-NN computation over encrypted cloud data without key ***,security analysis is presented to demonstrate the new scheme can provide data privacy and query privacy in the Known Ciphertext Model.

关键词： cloud computing k-nearest neighbors computation privacy Known Ciphertext Model

来源：评论

学校读者我要写书评

暂无评论

A New Fragmentation Strategy for Video of HTTP Live Streaming

A New Fragmentation Strategy for Video of HTTP Live Streamin...

引用

International Conference on Mobile Ad-hoc and sensor networks, MSN

作者： Xiaorui Li Lei Wang Jingwu Cui Baoyu Zheng National Mobile Communications Research Laboratory Southeast University Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology (NUPT) Nanjing China

ISBN: (纸本)9781509056972

To achieve the flexible and efficient transmission of files in the video on demand system, this paper proposed a three-tier fragmentation strategy which provided a unfiled method of fragmentation for video of HTTP Live Streaming and large file. In order to prove the rationality of the three-tier fragmentation strategy, we compared it with the two layers fragmentation strategy and the fragmentation strategy of equal time. And the comparisons proved the superiority of three-tier fragmentation strategy.

关键词： Peer-to-peer computing IPTV Packet loss Video on demand Data communication

来源：评论

学校读者我要写书评

暂无评论

Effective Prediction Mode Decision Scheme Concerning Scene Switch

Effective Prediction Mode Decision Scheme Concerning Scene S...

引用

International Conference on wireless communications and Signal Processing

作者： Wei Pu Dong Hu Education Ministry's Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781509028610

In HEVC, prediction mode decision is essential for efficient coding in applications. While many fast algorithms have been designed to reduce the candidate modes, the features of scene switch frames have seldom been considered. These frames usually have no relationship with the previous frames. Thus, intra modes should be used. In this paper, we propose a simple and efficient Hash-based algorithm. It evaluates the motion intensity of videos and can detect the occurrence of scene switch efficiently. Then chooses the best prediction modes among intra ones directly for CUs in these frames. Experimental results show that it achieves 42% to 53% time saving of the switch frame prediction. Meanwhile, as the prediction time of a switch frame is about 5 to 13 times over that of a normal continuous frame, the algorithm can achieve an outstanding improvement in the prediction of the whole video, especially when dealing with multi-scene videos.

关键词： Mode decision Intra mode Motion intensity Scene switch

来源：评论

学校读者我要写书评

暂无评论

Design of P2P Application Layer Protocol

Design of P2P Application Layer Protocol

引用

International Conference on Mobile Ad-hoc and sensor networks, MSN

作者： Yujie Ma Lei Wang Jingwu Cui Baoyu Zheng National Mobile Communications Research Laboratory Southeast University Nanjing China Network Technology (NUPT) Key Lab of Broadband Wireless Communication and Sensor Nanjing China

ISBN: (纸本)9781509056972

On the basis of studying the principle and application technology of P2P protocol, we design the private protocol of P2P application layer to meet the needs of P2P communication. This application layer protocol splits up video into three types of blocks in order to improve transmission efficiency. Besides, the protocol can be expanded when needed since there are some invalid bits in the state list.

关键词： Peer-to-peer computing Protocols Streaming media Authentication Servers Sockets Law

来源：评论

学校读者我要写书评

暂无评论

Sleeping-time Analysis for Cognitive OFDM-PON

Sleeping-time Analysis for Cognitive OFDM-PON

引用

International Conference on wireless communications and Signal Processing

作者： Qiang Yu Xiaoting Yu Xiao Wu Lei Wang Baoyu Zheng Global Energy Interconnection Research institute Key Lab of Broadband Wireless Communication and Sensor Network Technology (NUPT) National Mobile Communications Research Laboratory Southeast University

ISBN: (纸本)9781509028610

In this paper, we introduce the concept of OFDM-PON, and introduce the best method to choose the maximum sleep time based on link speed and queue buffer capacity. By analyzing the relationship between the longest sleep time and the queue buffer capacity, it is concluded that inducing cognition into OFDM-PON can be used as an effective method to improve the energy efficiency.

关键词： Cognition OFDM-PON Sleeping time Link speed Queue buffer capacity

来源：评论

学校读者我要写书评

暂无评论

Load Balanced Coding Aware Multipath Routing for wireless Mesh networks

引用

Chinese Journal of Electronics 2015年第1期24卷 8-12页

作者： SHAO Xing WANG Ruchuan HUANG Haiping SUN Lijuan College of Computer Nanjing University of Posts and Telecommunications College of Information Engneering Yancheng Institutue of Technology Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Lab of Broadband Wireless Communication and Sensor Network Technology

The growth of network coding opportunities is considered the unique optimization goal by most current network coding based routing algorithms for wireless mesh networks. This usually results in flows aggregation problem in areas with coding opportunities, and degrades the network performance. This paper proposes a Load balanced coding aware multipath routing(LCMR)for wireless mesh networks. To facilitate the evaluation of discovered multiple paths and the tradeoffs between coding opportunity and load balancing, a novel routing metric, Load balanced coding aware routing metric(LCRM) is presented, which considers the load degree of nodes when detects coding opportunities. LCMR could spread traffic over multipath to further balance load. Simulation results demonstrate that LCMR could evenly spread the traffic over the network with increasing network throughput in a heavy load at the expense of some coding opportunities.

关键词： Load balanced Coding aware Multipath Routing wireless mesh networks.

来源：评论

学校读者我要写书评

暂无评论

A Normalization Model for Analyzing Multi-Tier Millimeter Wave Cellular networks

arXiv

引用

arXiv 2017年

作者： Xiong, Siqing Wang, Lijun Kwak, Kyung Sup Bai, Zhiquan Wang, Jiang Li, Qiang Han, Tao School of Electronic Information and Communications Huazhong University of Science and Technology Wuhan China School of Electronic Information Wuhan University Wuhan China Faculty of information science and technology Wenhua College Wuhan China Department of Information and Communication Inha university Incheon Korea Republic of School of Information Science and Engineering Shandong University Jinan China Shanghai Research Center for Wireless Communications Shanghai China Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China Key lab of wireless sensor network and communication Chinese Academy of Sciences Shanghai China

—Based on the distinguishing features of multi-tier millimeter wave (mmWave) networks such as different transmit powers, different directivity gains from directional beamforming alignment and path loss laws for line-of-sight (LOS) and non-line-of-sight (NLOS) links, we introduce a normalization model to simplify the analysis of multi-tier mmWave cellular networks. The highlight of the model is that we convert a multi-tier mmWave cellular network into a single-tier mmWave network, where all the base stations (BSs) have the same normalized transmit power 1 and the densities of BSs scaled by LOS or NLOS scaling factors respectively follow piecewise constant function which has multiple demarcation points. On this basis, expressions for computing the coverage probability are obtained in general case with beamforming alignment errors and the special case with perfect beamforming alignment in the communication. According to corresponding numerical exploration, we conclude that the normalization model for multi-tier mmWave cellular networks fully meets requirements of network performance analysis, and it is simpler and clearer than the untransformed model. Besides, an unexpected but sensible finding is that there is an optimal beam width that maximizes coverage probability in the case with beamforming alignment errors. Copyright © 2017, The Authors. All rights reserved.

关键词： wireless networks

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：