检索结果-内蒙古大学图书馆

2011 International Conference on Information technology, Computer Engineering and Management Sciences, ICM 2011

作者： Cheng, Chunling Hao, Jingbo Zhang, Dengyin College of Computer Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing Jiangsu 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Jiangsu Province Nanjing Jiangsu 210003 China

ISBN: (纸本)9780769545226

On the battlefield, the cooperative fighting and communication among combat vehicles require higher service level of real-time transmission. Combat vehicles' fast moving and the links' frequent disruption lead to the increase of packet loss rate, packet delay and routing control overhead ratio. This paper proposes an expanding ring prediction and location aided AODV routing algorithm. It improves AODV routing protocol from both routing discovery and maintenance phases. In the rouing discovery phase, the algorithm limits the scope of sending RREQ through predicting the topology ring;and during the route maintenance phase, it predicts the motion range of destination node with the information provided by GPS to avoid blindness routing. The simulation results show that the proposed routing algorithm can greatly cut down the overload of combat vehicular network, improve the routing delay and reduce packet loss rate. It can meet the real-time requirements of the service transmission among combat vehicles and also improve the performance of the combat vehicular network. © 2011 IEEE.

关键词： Forecasting

来源：评论

学校读者我要写书评

暂无评论

A noval data collection approach for Wirelsee sensor networks

A noval data collection approach for Wirelsee Sensor Network...

引用

2nd Annual Conference on Electrical and Control Engineering, ICECE 2011

作者： Wang, Haiyong Yang, Geng Xu, Jian Chen, Zhengyu Chen, Lei Yang, Zhen College of Internet of Things Nanjing University of Posts and Telecommunications Nanjing 210003 Jiangsu China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Post and Telecommunications Nanjing 210003 China

ISBN: (纸本)9781424481637

The unmanned nature of wireless sensor networks make them very vulnerable to the malicious attacks. Therefore, how to complete secure data collection under different conditions is the crucial issue to wireless sensor networks. There have been a few on-going research efforts about multipath routing for secure data collection. In this paper, we make full use of the broadcast message when wireless sensor network initializes to construct secure multipath routing for secure data collection which will cause little overhead to the sensor nodes in the network. In accordance with the simulation results, the algorithm in this paper compares with other recent researches is better. © 2011 IEEE.

关键词： sensor nodes

来源：评论

学校读者我要写书评

暂无评论

AN IMPROVED EPON UPSTREAM TRANSMISSION SCHEME WITH ZERO INTER-PERIOD IDLE LOSS

引用

Journal of Electronics(China) 2011年第4期28卷 664-669页

作者： Shen Jianhua Guo Hongmei Mi Zhengkun Key Lab of Broadband Wireless Communication and Sensor Network Technology （ NUPT） Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

Existing Ethernet Passive Optical network(EPON) Dynamic Bandwidth Allocation(DBA) algorithms suffer from the disadvantage of idle time loss,which lower the upstream bandwidth *** letter proposes an improved upstream transmission scheme with idle-time eliminating *** analysis and numerical calculation prove that the improved scheme can ef-fectively eliminate the idle time and enhance the efficiency of upstream link *** results have shown that the bandwidth utilization can be raised up to 15% in heavy-load scenarios while the time delay performance of Assured Forwarding(AF) and Best Effort(BE) services are improved simultaneously.

关键词： Ethernet Passive Optical network(EPON) Dynamic Bandwidth Allocation(DBA) algorithm Channel transmission scheme Idle time eliminating

来源：评论

学校读者我要写书评

暂无评论

Performance analysis of data aggregation algorithms in wireless sensor networks

Performance analysis of data aggregation algorithms in wirel...

引用

2nd Annual Conference on Electrical and Control Engineering, ICECE 2011

作者： Xu, Jian Yang, Geng Chen, Zheng-Yu Chen, Lei Yang, Zhen College of Computer Science and Technology Nanjing University of Posts and Telecommunications Nanjing 210003 Jiangsu China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 Jiangsu China

ISBN: (纸本)9781424481637

Resource-constrained is a critical issue in wireless sensor networks (WSN) applications. Data aggregation (or data fusion) is one of the key techniques to solve the problem. Data aggregation can effectively reduce the data traffic, thereby reduce energy consumption, and extend the network's survival time. The research of data aggregation relates to many aspects of technology, so that the design of efficient data aggregation algorithm is a challenging task. In this paper, we investigate the effect of essential operations, scheduling algorithm and aggregation tree construction, has on data aggregation performance. The main performance such as end-to-end delay and energy-consumption of different aggregation schemes has been studied and measured by simulation experiment. © 2011 IEEE.

关键词： Scheduling algorithms

来源：评论

学校读者我要写书评

暂无评论

An improved epon upstream transmission scheme with zero inter-period idle loss

引用

Journal of Electronics 2011年第4期28卷 664-669页

作者： Shen, Jianhua Guo, Hongmei Mi, Zhengkun Key Lab of Broadband Wireless Communication and Sensor Network Technology (NUPT) Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

Existing Ethernet Passive Optical network (EPON) Dynamic Bandwidth Allocation (DBA) algorithms suffer from the disadvantage of idle time loss, which lower the upstream bandwidth utilization. This letter proposes an improved upstream transmission scheme with idle-time eliminating mechanism. Theoretical analysis and numerical calculation prove that the improved scheme can effectively eliminate the idle time and enhance the efficiency of upstream link utilization. Simulation results have shown that the bandwidth utilization can be raised up to 15% in heavy-load scenarios while the time delay performance of Assured Forwarding (AF) and Best Effort (BE) services are improved simultaneously. © 2011 Science Press, Institute of Electronics, CAS and Springer-Verlag Berlin Heidelberg.

关键词： Channel transmission scheme Dynamic Bandwidth Allocation (DBA) algorithm Ethernet Passive Optical network (EPON) Idle time eliminating

来源：评论

学校读者我要写书评

暂无评论

An energy optimization scheme based on rate guarantee in emergency mesh network

An energy optimization scheme based on rate guarantee in eme...

引用

2011 International Conference on wireless communications and Signal Processing, WCSP 2011

作者： Zhao, Su Liang, Changqing Meng, Qingmin College of Telecommunication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China National Mobile Communications Research Lab. Southeast University Nanjing 210003 China

ISBN: (纸本)9781457710100

The wireless mesh network (WMN) is effective as emergency networks in disaster area which has a flexible network topology. The efficiency of the energy is particularly important in the emergency communication network. In this paper, we proposed an energy optimization scheme based on the framework of wireless mesh networks. This scheme ensures the data rate achieved under the condition of the original transmission power in the wireless mesh network, by reducing the mutual interference between nodes to make the transmission power of the nodes down, thus extends the lifespan of the emergency network effectively. A number of simulation results show that the proposed scheme can reduce the transmission power of nodes while ensuring the end-to-end data rates. © 2011 IEEE.

关键词： MESH networking

来源：评论

学校读者我要写书评

暂无评论

Secret and reliable coding mechanism for noncoherent multisource network coding

Secret and reliable coding mechanism for noncoherent multiso...

引用

IEEE International Conference on communication Software and networks

作者： Chen, Siguang Wu, Meng Lu, Weifeng Jin, Yi College of Computer Science Nanjing University of Posts and Telecommunications Nanjing China College of Telecommunications and Information Engineering Nanjing Univ. of Posts and Telecommunications Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education China College of Informatics and Electronics Zhejiang Sci-Tech University Hangzhou China

ISBN: (纸本)9781612844855

This work considers the communication scenario where multiple sources transmit information to one or more receivers and these receivers request the information from all the sources. We construct a secret and reliable coding mechanism for noncoherent multisource network coding by extending the work [9, 10] to multisource case. Although the network scenario suffers from an adversary that can re-select the tapping links in different time slot and inject z erroneous packets into network, and the transmission links suffer from a packet erasures, our scheme can retrieve the original information secretly and accurately from the corrupt and deficient information. Meanwhile, the secret and reliable multisource network coding scheme can obtain an asymptotic achievable rate of k2z3. © 2011 IEEE.

关键词： network coding

来源：评论

学校读者我要写书评

暂无评论

A DISTRIBUTED COMPRESSED SENSING APPROACH FOR SPEECH SIGNAL DENOISING

引用

Journal of Electronics(China) 2011年第4期28卷 509-517页

作者： Ji Yunyun Yang Zhen College of Communication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts ＆ Telecommunications Nanjing 210003 China

Compressed sensing,a new area of signal processing rising in recent years,seeks to minimize the number of samples that is necessary to be taken from a signal for precise *** precondition of compressed sensing theory is the sparsity of *** this paper,two methods to estimate the sparsity level of the signal are *** then an approach to estimate the sparsity level directly from the noisy signal is ***,a scheme based on distributed compressed sensing for speech signal denoising is described in this work which exploits multiple measurements of the noisy speech signal to construct the block-sparse data and then reconstruct the original speech signal using block-sparse model-based Compressive Sampling Matching Pursuit(CoSaMP) *** simulation results demonstrate the accuracy of the estimated sparsity level and that this de-noising system for noisy speech signals can achieve favorable performance especially when speech signals suffer severe noise.

关键词： Distributed compressed sensing Sparsity estimation Speech signal Denoising

来源：评论

学校读者我要写书评

暂无评论

Image-based position estimation and adaptive modulation coding in vehicular communication

引用

Journal of networks 2011年第12期6卷 1754-1759页

作者： Yang, Hao Meng, Qingmin Gu, Xiong Zheng, Baoyu School of Geography and Biological Information Key Lab of Broadband Wireless Communication and Sensor Network Tech. Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China National Mobile Communications Research Lab Southeast University Nanjing 210096 China

Vehicle position estimation is a key technology for Inter-Vehicle communications, while template matching can be used to get information of vehicular position. In the paper, a simplified template matching, namely area-based template match is considered. A vehicular communication system designed for wireless data application is proposed where a camera is fixed in a vehicle which is served as a base station. By means of comparison between the outline area of vehicular image and reference templates, the base station can obtain the position estimation of the vehicle. The reference templates can be pre-calculated from a group of field experiment data. Based on supervised learning, we develop an image-based vehicle position estimation method and evaluate its effect on an adaptive coding modulation scheme. The computer simulation results show that in the wireless fading channel with the OFDM physical model, compared with fixed modulation coding scheme, the studied adaptive modulation and coding (AMC) scheme taking account of the position estimation can gain greater throughput. © 2011 ACADEMY PUBLISHER.

关键词： Orthogonal frequency division multiplexing

来源：评论

学校读者我要写书评

暂无评论

The Failover Performance of Multimedia Transporting by SCTP

The Failover Performance of Multimedia Transporting by SCTP

引用

International Conference on wireless communications, networking and Mobile Computing (WiCom)

作者： Wen-Nai Wang Mei Peng Fang-Fang Tang Jing-Ling Zhu Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Ministry of Education Nanjing China School of Comm. and Inform. Engg. Nanjing Univ. Posts and Telecomm. China

The Stream Control Transmission Protocol (SCTP) which provides multihoming at transport layer has been extended recently for multimedia streaming and vertical handover. However, failure recover control is still in design to meet real-time multimedia services. In this paper, we investigate experimentally the performance of SCTP's failover and fail-recover relying on an open source platform. The result shows that in stream transporting by lksctp module, the failover completed time distributes within 63 to 70 seconds, and the fail-recover with 0 to 25 seconds. It is also found that fail-recover time is strongly correlated with SCTP Heartbeat events.

关键词： Multimedia communication Streaming media Servers Switches Real time systems Protocols Heart beat

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：