检索结果-南通市图书馆

A NEW PRIVACY-PRESERVING EUCLID-DISTANCE PROTOCOL AND ITS APPLICATIONS IN WSNS

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2013年第2期30卷 190-197页

作者： Chen Ping Ji Yimu Wang Ruchuan Huang Haiping Zhang Dan 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

Recently, privacy concerns become an increasingly critical issue. Secure multi-party computation plays an important role in privacy-preserving. Secure multi-party computational geometry is a new field of secure multi-party computation. In this paper, we devote to investigating the solutions to some secure geometric problems in a cooperative environment. The problem is collaboratively computing the Euclid-distance between two private vectors without disclosing the private input to each other. A general privacy-preserving Euclid-distance protocol is firstly presented as a building block and is proved to be secure and efficient in the comparison with the previous methods. And we proposed a new protocol for the application in wireless sensor networks (WSNs), based on the novel Euclid-distance protocol and Density-Based Clustering Protocol (DBCP), so that the nodes from two sides can compute cooperatively to divide them into clusters without disclosing their location information to the opposite side.

关键词： Secure multi-party computation Privacy-preserving Euclid-distance protocol wireless sensor networks (WSNs) Density-Based Clustering Protocol (DBCP)

Image compression scheme based on PCA for wireless multimedia sensor networks

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2016年第1期23卷 22-30页

作者： Zhou Wei Sun Lijuan Guo Jian Liu Linfeng College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China Jiangsu High Technology Research Key laboratory for wireless sensor networks Nanjing 210003 China

In combination of the characteristic of the network architecture of wireless multimedia sensor networks （WMSNs）, a distributed multi-node cooperative network （DMCN） model is designed by using the concept of in-network processing to improve their energy, memory and computational power. To balance the energy consumption of the network, according to roles division, camera nodes and common nodes are cooperated to accomplish the workload of image acquisition, compression and transmission. Camera nodes gather images and send blocking images to the common nodes in cluster. Common nodes adaptively compress the partitioned images by using a noise-tolerant distributed image compression （NDIC） algorithm based on principal component analysis （PCA） called NDIC-PCA algorithm and send the compressed data to the cluster head node. Then, the cluster head node sends the compressed image data to the station. Simulation results demonstrate that, DCNM can effectively balance the energy consumption of network and largely extend the network lifecycle. In addition, compared with previous algorithms, the proposed NDIC-PCA algorithm achieves higher peak signal to noise ratio without decreasing compression ratio.

关键词： wireless multimedia sensor networks image compression principal component analysis node collaboration

A NEW APPROACH TO DVC COMBINED WITH ROI EXTRACTION AND RESIDUAL VIDEO CODING FOR MULTIMEDIA sensor networks

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2013年第1期30卷 17-24页

作者： Lin Zhaoxiao Sun Lijuan Xiao Fu Wang Ruchuan 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 Telecommunications) Ministry of Education Jiangsu Province

The Wyner-Ziv distributed video coding scheme is characterized for its intraframe encoder and interframe decoder which can also approach the efficiency of an interframe encoder-decoder system. In Wyner-Ziv residual coding of video, the residual of a frame with respect to a reference frame is Wyner-Ziv encoded, which can reduces the input entropy and leads to a higher coding efficiency than directly encoding the original frame. In this paper, we propose a new approach of residual coding combined with Region Of Interest (ROI) extraction. Experimental results show that, the proposed scheme achieves better rate-distortion performance compared to conventional Wyner-Ziv coding scheme.

关键词： Distributed Video Coding (DVC) Residual video coding Region Of Interest (ROI)

Direction-of-arrival estimation of quasi-stationary signals using two-level Khatri-Rao subspace and four-level nested array

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2014年第7期21卷 2743-2750页

作者：李双何为杨旭光鲍明王营冠 Key laboratory of wireless sensor networks and Communication Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences Communication Acoustics laboratory Institute of AcousticsChinese Academy of Sciences

The Khatri-Rao(KR) subspace method is a high resolution method for direction-of-arrival(DOA) *** with 2q level nested array,the KR subspace method can detect O(N2q) sources with N ***,the method cannot be applicable to Gaussian sources when q is equal to or greater than 2 since it needs to use 2q-th order *** this work,a novel approach is presented to conduct DOA estimation by constructing a fourth order difference *** the existing DOA estimation method based on the KR product and 2q level nested array,the proposed method only uses second order statistics,so it can be employed to Gaussian sources as well as non-Gaussian *** exploiting a four-level nested array with N elements,our method can also identify O(N4) *** order to estimate the wideband signals,the proposed method is extended to the wideband *** results demonstrate that,compared to the state of the art KR subspace based methods,the new method achieves higher resolution.

关键词： difference co-array direction-of-arrival estimation Khatri-Rao product nested array

Research on Data Privacy Protection Algorithm with Homomorphism Mechanism Based on Redundant Slice Technology in wireless sensor networks

在线全文

学校读者我要写书评

暂无评论

China Communications 2019年第5期16卷 158-170页

作者： Peng Li Chao Xu He Xu Lu Dong Ruchuan Wang School of Computer Science Nanjing University of Posts and TelecommunicationsNanjing 210003China Jiangsu High Technology Research Key laboratory for wireless sensor networks Nanjing 210003China

wireless transmission method in wireless sensor networks has put forward higher requirements for private protection technology. According to the packet loss problem of private protection algorithm based on slice technology, this paper proposes the data private protection algorithm with redundancy mechanism, which ensures privacy by privacy homomorphism mechanism and guarantees redundancy by carrying hidden data. Moreover,it selects the routing tree generated by CTP(Collection Tree Protocol) as routing path for data transmission. By dividing at the source node, it adds the hidden information and also the privacy homomorphism. At the same time,the information feedback tree is established between the destination node and the source node. In addition, the destination node immediately sends the packet loss information and the encryption key via the information feedback tree to the source node. As a result,it improves the reliability and privacy of data transmission and ensures the data redundancy.

关键词： wireless sensor network privacy protection slice technology privacy homomorphism collection tree protocol

Traffic Prediction Method for GEO Satellites Combining ARIMA Model and Grey Model

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2020年第1期25卷 65-69页

作者： ZHOU Jian YANG Qidong ZHANG Xiaofei HAN Chong SUN Lijuan College of Computer Jiangsu High Technology Research Key Laboratory for Wireless Sensor NetworksNanjing University of Posts and TelecommunicationsNanjing 210023China

An accurate traffle prediction on various service is of great importance to the channel resource management of geostationary earth orbit(GEO)***,a traffic prediction method for GEO satellites combining autoregressive integrated moving average(ARIMA)model and grey model is ***,the traffle prediction methods based on ARIMA model and grey model are introduced ***,a combined model is given,in which according to the results of the historical prediction of ARIMA model and grey model,those two models are combined with different ***,the combined model is applied to a multi-service access and the access probability of each kind of service is calculated based on the prediction ***,the simulation experiments indicate that the combined model has better prediction stability and higher average prediction accuracy than either of the separated ***,the proposed access strategy based on the combined model performs better than other similar strategies.

关键词： traffic prediction ARIMA model grey model access GEO satellites

Accurate energy model for WSN node and its optimal design

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2008年第3期19卷 427-433页

作者： Kan Baoqiang Cai Li Zhu Hongsong Xu Yongjun School of Science Air Force Engineering Univ. Xi'an 710051 P. R. China lab of wireless sensor networks Inst. of Computing Technology Chinese Academy of Sciences Beijing 100080 P. R. China

With the development of CMOS and MEMS technologies, the implementation of a large number of wireless distributed micro-sensors that can be easily and rapidly deployed to form highly redundant, self-configuring, and ad hoc sensor networks. To facilitate ease of deployment, these sensors operate on battery for extended periods of time. A particular challenge in maintaining extended battery lifetime lies in achieving communications with low power. For better understanding of the design tradeoffs of wireless sensor network （WSN）, a more accurate energy model for wireless sensor node is proposed, and an optimal design method of energy efficient wireless sensor node is described as well. Different from power models ever shown which assume the power cost of each component in WSN node is constant, the new one takes into account the energy dissipation of circuits in practical physical layer. It shows that there are some parameters, such as data rate, carrier frequency, bandwidth, Tsw, etc, which have a significant effect on the WSN node energy consumption per useful bit （EPUB）. For a given quality specification, how energy consumption can be reduced by adjusting one or more of these parameters is shown.

关键词： wireless sensor networks (WSNs) energy model optimal design.

Interference aware routing for mobile ad hoc networks based on node's sending and receiving capabilities

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2013年第4期20卷 73-79,111页

作者： GU Chao ZHU Qi Jiangsu Key laboratory of wireless Communications Nanjing University of Posts and Telecommunications Key lab on Wideband wireless Communications and sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications

How to efficiently build routes among nodes is increasing important for mobile ad hoc networks （MANETs）. This paper puts forward an interference aware routing protocol called Interference aware cross layer routing protocol （IA-CLR） for MANETs based on the IEEE 802.11 medium access layer （MAC）. By defining the node＇s sending and receiving capabilities, IA-CLR can indicate the interference strength of the link in a real and comprehensive way. Further more, in order to choose the route with minimum bottleneck link interference, a new routing metric is proposed by combining the MAC layer and the network layer for cross layer design. Simulation results show that IA-CLR can significantly improve the performances of network such as the average end-to-end delay, the packets loss ratio and the throughput.

关键词： ad hoc networks routing protocol routing design interference aware

Cooperative resource allocation in cognitive wireless powered communication networks with energy accumulation and deadline requirements

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2019年第8期62卷 145-158页

作者： Ding XU Qun LI wireless Communication Key lab of Jiangsu Province Nanjing University of Posts and Telecommunications Engineering Research Center of Health Service System Based on Ubiquitous wireless networks Nanjing University of Posts and Telecommunications

This study investigates a multi-carrier cognitive wireless powered communication network(CWPCN) with a wirelessly powered primary user(PU). A two-stage cooperative protocol between the PU and the secondary user(SU) is adopted so that the PU can harvest energy from the SU while the SU gains transmission opportunities. It is assumed that the energy harvested by the PU can be accumulated for future usage, and the quality of service of the PU is guaranteed by satisfying the required minimum number of data bits for a given deadline. Herein, we maximize the SU rate by considering the time allocation,subcarrier allocation, and power allocation in both an offline setting(in which the future channel gains are known a priori) and an online setting(in which only the current channel gains are known). In the offline and online schemes, the maximization problem is solved using the block-coordinate descent method and the Lagrange duality method. The effectiveness of the proposed schemes is evaluated and verified via simulation experiments against benchmark schemes.

关键词： wireless powered communication networks energy harvesting cognitive radio deadline constraint energy accumulation