检索结果-内蒙古大学图书馆

Interference suppression algorithms for D2D communication underlaying cellular networks

Journal of Computational Information Systems 2015年第18期11卷 6705-6717页

作者： Huan, Cheng Liu, Chen Fu, Youhua The Key Lab. of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China National Mobile Communications Research Laboratory Southeast University Nanjing China

In this paper, we investigate the interference scenario where Device-to-Device (D2D) users and the cellular user share the same spectrum resource, and propose two novel interference suppression algorithms for D2D communication. One of the two proposed algorithms is the step-by-step interference suppression algorithm called SISA, and the other one is the joint interference suppression algorithm called JISA. The SISA mainly deals with the cellular interference to the D2D receiver, while the JISA copes with not only the cellular interference but also the noise at the D2D receiver. Both algorithms are designed from the perspective of precoding and decoding. Based on this, we first formulate the interference suppression problem for D2D communication as an optimization problem to maximize the signal-to- interference- plus-noise ratio (SINR) of the D2D receiver, and regard the precoding vector of the D2D transmitter and the decoding vector of the D2D receiver as the optimized variables. Second, we in turn propose the SISA and JISA to solve the optimization problem. Finally, we derive out respective closed-form expressions for optimize variables according to the SISA and JISA. Numerical results show that the two proposed algorithms both enable D2D to achieve significant performance gains over that using the existing schemes in terms of SINR and bit-error rate (BER). © 2015 by Binary Information Press.

关键词： Bit error rate

来源：评论

学校读者我要写书评

暂无评论

Review on MAC Protocols in Energy-Harvesting Wireless Body Area networks

Review on MAC Protocols in Energy-Harvesting Wireless Body A...

引用

International Conference on Identification, Information and Knowledge in the Internet of Things (IIKI)

作者： Shidong Liu Kun Wang Jinghong Guo Yao Wang Xin Qi Smart Grid Research Institute State Grid Nanjing china Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing China

Wireless Body Area networks (WBANs) have become a leading solution in Mobile Health (mHealth). Typically, a WBAN consists of in-body or around-body sensor nodes for collecting data of physiological feature. For a WBAN to provide high throughput and low delay in an energy-efficient way, designing an efficient Medium Access Control (MAC) protocol is of paramount importance because the MAC layer coordinates nodes' access to the shared wireless medium. To show the difference of MAC protocols between Energy-Harvesting wireless body area networks (EH-WBANs) and battery powered WBANs (BT-WBANs), this article surveys the latest progresses in energy harvesting techniques and WBAN MAC protocol designs.

关键词： Wireless communication Media Access Protocol Body area networks Energy harvesting Wireless sensor networks Batteries

来源：评论

学校读者我要写书评

暂无评论

LFDD: Local False Data Detection for In-network Aggregation in Wireless sensor networks

LFDD: Local False Data Detection for In-Network Aggregation ...

引用

International Symposium on Computational Intelligence and Design

作者： Chao Ding Lijun Yang Meng Wu College of Computer Science Nanjing University of Posts and Telecommunications Key Lab of "Broadband Wireless Communication and Sensor Network Technology" of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781467395885

To minimize the damage of false data injection attack, detecting the false injected data for the in-network aggregation in sensor networks at an early stage becomes a necessary and challenging task. In this paper, we adopt Hierarchical Bayesian Space-Time (HBST) methodology to characterize the data model of in-network aggregation, and propose a divided difference filter (DDF) based scheme LFDD to detect false injected data. We evaluate the performance of the proposed scheme via the theoretical analysis, and conduct the experiments on the Telosb platform using TinyOS-2.1 to validate the theoretical results. Both the theoretical and experimental results indicate that LFDD is suitable to resist false data injection attack for aggregation in WSNs.

关键词： sensor networks security in-network aggregation hierachical bayesian space-time (HBST) methodology divided difference filter (DDF)

来源：评论

学校读者我要写书评

暂无评论

R-PMD: robust passive motion detection using PHY information with MIMO

R-PMD: robust passive motion detection using PHY information...

引用

IEEE International Conference on Performance, Computing and communications (IPCCC)

作者： Hai Zhu Fu Xiao Lijuan Sun xiaohui Xie Panlong Yang Ruchuan Wang College of Computer Nanjing University of Posts and Telecommunications China Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education China College of Communications Engineering PLA University of Science and Technology China

Robust Device-free passive (Dfp) detection is an essential primitive for a broad range of applications such as intrusion detection and smart space. Most recent works focus on finer-grained Channel State Information (CSI), instead of the variable Received Signal Strength (RSS). However, existing solutions have some limitations, being feasible only in the line of sight (LOS) or for more than one targeted entities. Moreover, space diversity supported by the MIMO systems hasn't been fully investigated. Motivated by this observation, we propose a novel scheme for Robust Passive Motion Detection (R-PMD). In our scheme, the variance of CSI amplitude feature is extracted as a new metric and the earth mover's distance (EMD) is utilized to determine the detection results. Besides, CSIs across multiantennas are further exploited to improve the detection precision and robustness. We prototype R-PMD on commercial WiFi devices and evaluate it in a typical indoor scenario. Experiment results show R-PMD can achieve great performance in terms of sensitivity and robustness.

关键词： Feature extraction MIMO Robustness Wireless communication Legged locomotion Receiving antennas Measurement

来源：评论

学校读者我要写书评

暂无评论

Arbitrary Partially Entangled Three-Electron W State Concentration with Controlled-Not Gates

引用

Chinese Physics Letters 2014年第5期31卷 9-12页

作者：盛宇波冯兆峯欧阳阳屈长城周澜 Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing 210003 College of Mathematics and Physics Nanjing University of Posts and Telecommunications Nanjing 210003

We describe an efficient entanglement concentration protocol （ECP） for an arbitrary partially entangled threeelectron W state. We show that with the help of two ancillary single electrons, the concentration task can be well completed. This ECP has several advantages： Firstly, we only require one pair of partially entangled states. Secondly, only two single electrons are used during the whole protocol. Thirdly, we do not require all the parties to participate in the whole process, and only two parties are needed to perform the operation. Fourthly, the protocol can 5e repeated to obtain a high success probability. This ECP may be useful in current quantum computation and quantum communication.

关键词： QUANTUM entanglement ELECTRONS QUANTUM computing QUANTUM communication NONLINEAR theories

来源：评论

学校读者我要写书评

暂无评论

Semantic QoS Ontology and Semantic Service Ranking Approach for IoT services

引用

Journal of Harbin Institute of technology(New Series) 2014年第6期21卷 102-112页

作者： Nwe Nwe Htay Win Jian-Min Bao Gang Cui Purevsuren Dalaijargal School of Computer Science and Technology Harbin Institute of Technology Key Lab of Broadband Wireless Communication and Sensor Network Technolog Jiangsu Provincial Engineering Research Center of Telecommunications and Network TechnologyMinistry of Education

Due to a rapid increase in the number of functionally equivalent web services at open and dynamic Io T service environment,Qo S has become a major discrimination factor to reflect the user's expectation and experience of using a *** are different languages and models for expressing Qo S advertisements and requirements among service providers and ***,it leads to the issues of semantic interoperability of Qo S information and semantic similarity match between a semantic description of the service being requested by the service consumer,and a formal description of the service being offered by the service *** this paper,we propose a hierarchical two-layer semantic Qo S ontology to promote the description and declaration of Qo S-based service information in detail for any domain and ***,we develop a semantic matchmaking algorithm to compare the web services according to their Qo S information and adopt analytical hierarchy process( AHP) to make decision for the ranked services depending on the Qo S *** comparison study and experimental result show that our proposed system is superior to other service ranking approaches.

关键词： IoT service environment semantic QoS ontology semantic matchmaking algorithm QoS-based service information analytical hierarchy process

来源：评论

学校读者我要写书评

暂无评论

A Multi-dimensional Index Structure Based on Improved VA-file and CAN in the Cloud

引用

International Journal of Automation and computing 2014年第1期11卷 109-117页

作者： Chun-Ling Cheng Chun-Ju Sun Xiao-Long Xu Deng-Yin Zhang 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 Nanjing University of Posts and TelecommunicationsMinistry of Education Jiangsu Province

Currently,the cloud computing systems use simple key-value data processing,which cannot support similarity search efectively due to lack of efcient index structures,and with the increase of dimensionality,the existing tree-like index structures could lead to the problem of"the curse of dimensionality".In this paper,a novel VF-CAN indexing scheme is ***-CAN integrates content addressable network(CAN)based routing protocol and the improved vector approximation fle(VA-fle) *** are two index levels in this scheme:global index and local *** local index VAK-fle is built for the data in each storage ***-fle is thek-means clustering result of VA-fle approximation vectors according to their degree of *** cluster forms a separate local index fle and each fle stores the approximate vectors that are contained in the *** vector of each cluster center is stored in the cluster center information fle of corresponding storage *** the global index,storage nodes are organized into an overlay network CAN,and in order to reduce the cost of calculation,only clustering information of local index is issued to the entire overlay network through the CAN *** experimental results show that VF-CAN reduces the index storage space and improves query performance efectively.

关键词： Cloud computing index similarity search clustering vector approximation fle(VA-fle) content addressable network(CAN)

来源：评论

学校读者我要写书评

暂无评论

Risk prediction model based on improved AdaBoost method for cloud users

引用

Open Cybernetics and Systemics Journal 2015年第1期9卷 44-49页

作者： Zhang, Lin Rao, Kaili Wang, Ruchuan Jia, Yishang College of Computer Nanjing University of Posts and Telecommunications Nanjing210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks NanjingJiangsu Province210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nangjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nangjing210003 China

Considering the problem how to protect the cloud services from being destroyed by cloud users, the riskprediction model based on improved AdaBoost method is proposed. The risk prediction is regarded as two-class classification problem, and the risk of new cloud users could be predicted by the attributes of historical cloud users. In order to improve the result of predicted, AdaBoost method is adopted in this paper. The error rate of the last training is used to adjust the sample distribution of the next training, which can make the next training have stronger ability of identification for the error-classified samples. At the same time the weight of each weak classifier is set. After all, the strong classifier is generated by combined the weak classifiers through voting, which can improve the overall result of classification. Considering the wrongly-predicted cost, AdaBoost method is improved. The method of cost-sensitive is added into the model in order to minimal the misclassified-cost. Experiments show that the cost-sensitive AdaBoost method has better classification result than the traditional ones and it can predict the risk of the new cloud user effectively and protect the security of the cloud services. © Zhang et al.

关键词： Adaptive boosting

来源：评论

学校读者我要写书评

暂无评论

Flexible user-centric service selection algorithm for Internet of Things services

引用

Journal of China Universities of Posts and Telecommunications 2014年第SUPPL. 1期21卷 64-70页

作者： Nwe, Nwe Htay Win Bao, Jian-Min Cui, Gang School of Computer Science and Technology Harbin Institute of Technology Harbin 15001 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China

In Internet of Things (IoT), the similar functional services are evolving in different quality of services (QoS) due to the widespread deployment of spatially distributed things on dynamic networks through the web. Therefore, the user involvement in service selection systems becomes a vital role to enhance the system performance by taking into account of subjective factors. This paper proposes a flexible QoS-based service selection algorithm (FQSA) which mainly targets to the users to be able to give their subjective preferences in an easy and friendly manner. The FQSA algorithm selects the services based on subjective information provided by the service consumers and objective information supported by the service providers. It adopts artificial neural network backpropagation algorithm to find the objective factors and applies similarity aggregation method to evaluate the creditability of the user subjective factors which have already been evaluated by ontological reasoning with the help of proposed QoS ontology. The comparative study and experimental results show that our FQSA algorithm is superior to other service selection approaches. © 2014 The Journal of China Universities of Posts and Telecommunications.

关键词： Neural networks

来源：评论

学校读者我要写书评

暂无评论

A parallel HEVC encoder scheme based on Multi-core platform

A parallel HEVC encoder scheme based on Multi-core platform

引用

2015 4th National Conference on Electrical,Electronics and Computer Engineering(NCEECE 2015)

作者： Shu Jun Hu Dong Education Ministry’s Key Lab of Broadband Wireless Communication and Sensor Network Technology Education Ministry’s Engineering Research Center of Ubiquitous Network and Health Service System Jiangsu Province’s Key Lab of Image Procession and Image Communications Nanjing University of Post and Telecommunications

ISBN: (纸本)9781510819085

In this paper, we propose a parallel HEVC encoder scheme based on multi-core platform, which provides maximized parallel scalability by exploiting two-level parallelism, namely, the frame level parallelism and the CTB level parallelism. Inspired by the intra-CTB row level parallelism of WPP in HEVC, we investigate the inter-frame CTB prediction dependency to its reference CTBs, and find the inter-CTB correlation. Using this inter-correlation, we divide a frame into CTB units and create CTB-row level coding threads when their corresponding reference CTBs are available. Each thread is bonded to a processing core, therefore, both intra- and inter-CTB rows can be encoded in parallel. Moreover, we introduce a priority scheduling mechanism to control the coding threads. Experiments on Tilera-Gx36 multi-core platform show that, compared with serial execution, the proposed method achieves 3.6 and 4.3 times speedup for 1080 P and 720 P video sequences, respectively.

关键词： HEVC multi-core platform parallel processing frame-level CTB-level

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：