检索结果-内蒙古大学图书馆

6th International ICST Conference on wireless Internet, WICON 2011

作者： Fan, Juan Zhang, Sihai Zhou, Wuyang Wireless Information Network Lab. Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei Anhui 230026 China Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China

ISBN: (纸本)9783642304927

Joint radio resource management (JRRM) mechanism helps to optimize the radio resource usage of heterogeneous wireless networks but the introduction of central new entity which manages the information of all networks in JRRM may require unbearable change to current network architecture. Aiming at easily integrating with existing and forthcoming heterogeneous wireless networks, this paper proposes a semi-distributed scheme without centralized entity, in which user terminal make decision on network selection through fuzzy neural network method based on local information and the selected network finishes the admission control to user terminal according to its actual resource condition. Our scheme is verified by the simulation in the UMTS/WLAN scenario and can effectively balance the load between the UMTS/WLAN networks while maintaining the level of blocking probability compared to traditional distributed WLAN-prefer algorithm. © 2012 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering.

关键词： Blocking probability

来源：评论

学校读者我要写书评

暂无评论

Energy-efficient distributed relay selection based on statistical channel state information

Energy-efficient distributed relay selection based on statis...

引用

6th International ICST Conference on wireless Internet, WICON 2011

作者： Jiang, Haifang Zhang, Sihai Zhou, Wuyang Wireless Information Network Lab. Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei Anhui 230026 China Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China

ISBN: (纸本)9783642304927

In this paper, distributed relay selection algorithms based on statistical Channel State Information (CSI) in amplify-and-forward mode are proposed, aiming to maximize energy efficiency. With the limited CSI, a tradeoff is made between the total power consumption and the target outage probability at the source. A forwarding threshold is obtained by minimizing the average transmission power. Each relay individually decides whether to participate in forwarding the source signals according to the forwarding threshold. Firstly, a Distributed Multiple Relay Selection (DMRS) algorithm is proposed, in which all candidate relays have the possibility of transmitting the source signals and the threshold is obtained by numerical search. Then a Distributed Single Relay Selection (DSRS) algorithm with low complexity is investigated under the assumption that only one relay forwards the signals. Simulation results indicate that the proposed algorithms provide significant performance gain in terms of energy efficiency over the existing AF-mode relay selection algorithms. © 2012 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering.

关键词： Energy efficiency

来源：评论

学校读者我要写书评

暂无评论

The master-slave stochastic knapsack modelling for fully dynamic spectrum allocation

The master-slave stochastic knapsack modelling for fully dyn...

引用

6th International ICST Conference on wireless Internet, WICON 2011

作者： Zhang, Sihai Yang, Fei Zhou, Wuyang Wireless Information Network Lab. Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei Anhui 230026 China Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China

ISBN: (纸本)9783642304927

Scarcity problem of radio spectrum resource stimulates the research on cognitive radio technology, in which dynamic spectrum allocation attracts lots of attention. For higher access efficiency in cognitive radio context, we suggest a fully dynamic resource allocation scheme for primary and secondary users, which is modelled by a master-slave stochastic knapsack process. Equilibrium behavior is analyzed, and expressions of blocking probability of both slave and master classes are derived as performance criterion and verified by numeric simulation, as well as forced termination probability of the secondary users. Compared to traditional opportunistic spectrum access (OSA), which can be regarded as half dynamic, our scheme leads to less termination events for the slaves while keeping the same behavior for the master class, promoting the system access performance. © 2012 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering.

关键词： Cognitive radio

来源：评论

学校读者我要写书评

暂无评论

A full-rate cooperative communication strategy in wireless relay networks

A full-rate cooperative communication strategy in wireless r...

引用

6th International ICST Conference on wireless Internet, WICON 2011

作者： Zhan, Lei Yang, Fei Zhang, Sihai Zhou, Wuyang Wireless Information Network Lab. Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei Anhui 230026 China Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China

ISBN: (纸本)9783642304927

In this paper, we propose a new full-rate cooperative communication strategy in wireless relay networks without direct path between source and destination. This strategy coined full-rate amplify-and-forward (FRAF) utilizes multiple relay nodes to take turns to amplify and forward data package for the transmitter at different time slot. Thus the source node could continue sending without cessation. On the other hand, prevailing linear constellation precoding process is adopted at the source node to solve the problem caused by the imbalance of the error performance of the data sent at odd and even time slots. Furthermore, we analyze the outage probability and certificate that FRAF strategy can achieve the full diversity gain. The simulation results indicate that FRAF could improve the performance of the system effectively compared to the conventional amplify-and-forward (AF) and decode-and-forward (DF) strategy. © 2012 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering.

关键词： Cooperative communication

来源：评论

学校读者我要写书评

暂无评论

Research on heart sound identification technology

引用

Science China(Information Sciences) 2012年第2期55卷 281-292页

作者： CHENG XieFeng1,3,MA Yong2,LIU Chen1,ZHANG XueJun1 & GUO YuFeng11School of Electronic Science and Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China 2School of Computer Science and technology,Nanjing University of Science and technology,Nanjing 210094,China 3key lab of Broudbard wireless communication and sensor network technology(Nanjing University of Posts and Telecommunications),Ministry of Education,Nanjing 210094,China 1. School of Electronic Science and Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China3. Ministry of Education Key Lab of Broudbard Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Nanjing 210094 China2. School of Computer Science and Technology Nanjing University of Science and Technology Nanjing 210094 China

In this article,both the basic principles and the experimental methods of identity recognition technology based on heart sounds are ***,the characteristics of heart sounds and the feasibility of heart sounds as a biometric were analyzed.A synthetic model of heart sounds was then developed based on a family of wavelets;Finally,the characteristic parameters of heart sounds were extracted by using the heart sounds linear band frequency cepstra(HS-LBFC)with a specified configuration,and the similarity distance was adopted for heart sound *** highlight the difference in two heart sound signals between the time and frequency domains,a construction method of the heart sound wavelet,a calculation method of the parameters of a synthetic model,selection of the characteristic parameters of heart sounds and the corresponding data processing technology were *** experimental results showed that the proposed method exhibited excellent performance and practicability.

关键词： biometric wavelet family of heart sounds synthetic model of heart sounds heart sounds linear band frequency cepstra(HS-LBFC)

来源：评论

学校读者我要写书评

暂无评论

Genetic algorithm based coding aware routing for wireless mesh networks

引用

Advances in Information Sciences and Service Sciences 2012年第5期4卷 235-243页

作者： Shao, Xing Wang, Ruchuan Xu, He Huang, Haiping Sun, Lijuan College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China 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 210003 China

network coding has been confirmed as a potential technology to improve performance of wireless mesh networks (WMNs) and a few network coding aware routings have been proposed. However, these mechanisms detect coding opportunities through local traffic pattern checking, which hardly obtains optimal routes. This paper proposes a Genetic algorithm based Coding Aware Routing (GCAR) for wireless mesh networks, which employs genetic algorithm to optimize routes and coding opportunities. In addition, the key ingredients in GCAR, e.g., chromosome representation, genetic operation of crossover and mutation, fitness function considering coding opportunity and interference, are carefully designed. Through simulations on a randomly generated wireless mesh network, GCAR is shown to find optimal routes within a short time, and achieve more improvements than the previously proposed methods on route setup time, throughput and load balancing.

关键词： Genetic algorithms

来源：评论

学校读者我要写书评

暂无评论

Detecting Encrypted Botnet Traffic Using Spatial-Temporal Correlation

引用

China communications 2012年第10期9卷 49-59页

作者： Chen Wei Yu Le Yang Geng College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 P. R. China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 P. R. China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing210003 P. R. China

In this paper, we to detect encrypted botnet propose a novel method traffic. During the traffic preprocessing stage, the proposed payload extraction method can identify a large amount of encrypted applications traffic. It can filter out a large amount of non-malicious traffic, greatly in, roving the detection efficiency. A Sequential Probability Ratio Test （SPRT）-based method can find spatialtemporal correlations in suspicious botnet traffic and make an accurate judgment. Experimental resuks show that the false positive and false nega- tive rates can be controlled within a certain range.

关键词： botnet encrypted traffic spatial-tenmporal correlation

来源：评论

学校读者我要写书评

暂无评论

(t, n) secret sharing scheme based on cylinder model in wireless sensor networks

引用

Journal of networks 2012年第7期7卷 1009-1016页

作者： Huang, Haiping Chen, Hao Wang, Ruchuan Mao, Qian Cheng, Renyuan Nanjing University of Posts and Telecommunications Department of Computer Nanjing University of Aeronautics and Astronautics Department of Computer Science and Technology Nanjing China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Ministry of Education/Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing China

Since the existence of characteristics of heterogeneity, limited energy, complexity and so forth, it turns into a research hot spot on the security mechanism of wireless sensor networks (WSN), especially the problems on the key management. On regard of the deficiency of extant secret sharing schemes, we develop a (t, n) threshold secret sharing scheme which is based on the cylinder model, including the procedures of master-key reconfiguration and sub-key updating. This scheme enables several nodes to be responsible for the security of key together, and by the mean time, we introduce a monitoring mechanism to improve the capability of anti-capturing. With the security theoretical analysis and the comparison with the performance on BPCGR, GKD simulation experiment, it reveals that our scheme satisfies the security requirement of key management in wireless sensor networks, and can effectively reduce the cost on communication and computation. © 2012 ACADEMY PUBLISHER.

关键词： wireless sensor networks

来源：评论

学校读者我要写书评

暂无评论

A novel channel estimation method for clipped OFDM systems based on virtual pilots

引用

Journal of Computational Information Systems 2012年第5期8卷 1905-1912页

作者： Xie, Yongsheng Zhou, Leilei Fu, Yaoxian Key Lab. of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology CAS Shanghai 200050 China

Data as well as pilot symbols are nonlinearly distorted due to signal clipping in practical OFDM systems. The distortion inflicted on pilot symbols has great negative effect on the channel estimation. To solve this issue, a novel iterative channel estimation algorithm based on virtual pilots is introduced for clipped OFDM systems in this paper. The algorithm iteratively estimates nonlinear distortion of data symbols, and subsequently uses it for data detection. Then part or all of the detected data symbols are used as virtual pilots to perform more precise channel re-estimation. The MSE of channel estimation is derived theoretically. Simulation results show that the proposal improves the performance remarkably with moderate complexity increase at the receiver. In particular, compared to traditional algorithm, the BER performance of this method increases by 0.3 dB. © 2012 Binary Information Press.

关键词： Peak to average power ratio

来源：评论

学校读者我要写书评

暂无评论

Single-channel Speech Separation by l0 Optimization Using Quasi-KLT Bases

引用

电子学报(英文版) 2012年第3期21卷 535-540页

作者： GUO Haiyan YANG Zhen ZHU Weiping YE Lei College of Engineering Nanjing Agricultural University Nanjing 210031 China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology (Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

This paper deals with single-channel speech separation. First, it is proved that when the sparse bases of the signal sources satisfy certain conditions, all the sources can be perfectly separated from a single mixture by l0 optimization. Then, a special case where the single mixture is generated by two independent speech sources is studied in more detail. It is revealed that the ideal quasi- KLT bases constructed from the original sources satisfy the sufficient conditions for perfect separation of mixed signals. Considering the fact that the ideal quasi-KLT bases cannot be obtained in practice, template-matching based quasi- KLT bases generated from the single mixture are also pro- posed to perform single-channel speech separation. Finally, simulation results demonstrating the effective performance of single-channel separation of two speech sources by l0op- timization using the template-matching based quasi-KLT bases are presented.

关键词：语音分离 KLT 优化单通道模板匹配混合物充分条件信号分离

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：