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检索条件"机构=Information and Communication Science and Technology Laboratory Laboratory Lab-STICC"

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A full-rate cooperative communication strategy in wireless relay networks

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

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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

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

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

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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

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Hybrid-on-chip communication architecture for dynamic MP-SoC protection

Hybrid-on-chip communication architecture for dynamic MP-SoC...

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Symposium on Integrated Circuits and Systems Design (SBCCI)

作者： Johanna Sepulveda Guy Gogniat Ricardo Pires Wang J. Chau Marius Strum Microelectronics Laboratory LME University of São Paulo Sao Paulo Brazil Information and Communication Science and Technology Laboratory Lab-STICC Université Bretagne Sud France Federal Institute of Education Science and Technology of São Paulo Sao Paulo Brazil

MPSoCs are able to support multiple applications on the same chip. This flexibility also represents a vulnerability, turning the MPSoC security specially challenging. Most of the current MPSoCs security services are based on symmetric and public-key cryptographic mechanisms. So that, MPSoCs integrate a large set of keys that must be exchanged in an efficient and secure way. In such scenario, any security concept will be ineffective if the key management is weak. In this paper, we present the implementation of an on-chip hybrid communication (HoCs) security-based architecture, that combines bus and Network-on-chip (NoC), to address the efficient and secure key management at MPSoCs. The HoC implements dynamically the QoSS (Quality of Security Service) concept that allows the customization of security. We evaluate the effectiveness of our approach over several MPSoCs attack scenarios and estimate their impact on the overall performance. We show that our architecture can perform a fast detection of a wide range of attacks and a fast configuration of the different security policies for several MPSoC applications. Our hybrid approach saves upto 16% and 25% of communication latency and power consumption, respectively, when compared to the NoC-based architecture without any security.

关键词： Data mining Buffer overflow

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Poster abstract: Direct multi-hop time synchronization with constructive interference

Poster abstract: Direct multi-hop time synchronization with ...

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International Symposium on information Processing in Sensor Networks (IPSN)

作者： Yin Wang Gaofeng Pan Zhiyu Huang MOE Key Lab for Information System Security TNLIST Tsinghua University Science and technology on communication information security control laboratory Chinese Academy of Sciences

ISBN: (纸本)9781479964703

Multi-hop time synchronization in wireless sensor networks (WSNs) is often time-consuming and error-prone due to random time-stamp delays for MAC layer access and unstable clocks of intermediate nodes. Constructive interference (CI), a recently discovered physical layer phenomenon, allows multiple nodes transmit and forward an identical packet simultaneously. By leveraging CI, we propose direct multihop (DMH) time synchronization by directly utilizing the time-stamps from the sink node instead of intermediate n-odes, which avoids the error caused by the unstable clock of intermediate nodes. DMH doesn't need decode the flooding time synchronization beacons. Moreover, DMH explores the linear regression technique in CI based time synchronization to counterbalance the clock drifts due to clock skews.

关键词： Synchronization Clocks Protocols Accuracy Interference Wireless sensor networks Relays

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Dynamic NoC-based architecture for MPSoC security implementation 11

Dynamic NoC-based architecture for MPSoC security implementa...

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24th Symposium on Integrated Circuits and Systems Design, SBCCI2011

作者： Sepúlveda, Johanna Gogniat, Guy Pires, Ricardo Chau, Wang J. Strum, Marius J. Microelectronics Laboratory LME University of São Paulo São Paulo Brazil Information and Communication Science and Technology Laboratory Lab.-STICC Université Bretagne Sud Lorient France Federal Institute of Education Science and Technology of São Paulo Sao Paulo Brazil

ISBN: (纸本)9781450308281

MPSoCs have been proposed as a promising architecture choice to overcome the challenging embedded electronics requirements, characterized by tights development times and fast evolution of applications. The MPSoC flexibility, also represents a system vulnerability. As security requirements vary dramatically for different applications, the challenge is to provide MPSoC security that allows a trustworthy system that meets all the security requirements of such applications. NoC has become an attractive alternative to support the MPSoC communication requirements. Our work proposes the implementation of dynamic security architecture to overcome present MPSoC vulnerabilities. We integrate agile and dynamic security firewalls into the NoC in order to detect attacks based on different security rules. We evaluate the effectiveness of our approach over several MPSoCs scenarios and estimate their impact on the overall performance. We show that our architecture can perform a fast detection of a wide range of attacks and a fast configuration of the different security policies for several MPSoC applications. © 2011 ACM.

关键词： Network-on-chip

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Reports of the AAAI 2010 fall symposia

Reports of the AAAI 2010 fall symposia

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作者： Azevedo, Roger Biswas, Gautam Bohus, Dan Carmichael, Ted Finlayson, Mark A. Hadzikadic, Mirsad Havasi, Catherine Horvitz, Eric Kanda, Takayuki Koyejo, Oluwasanmi Lawless, William F. Lenat, Doug Meneguzzi, Felipe Mutlu, Bilge Oh, Jean Pirrone, Roberto Raux, Antoine Sofge, Donald A. Sukthankar, Gita Van Durme, Benjamin Yorke-Smith, Neil Department of Educational and Counseling Psychology McGill University Canada Center for Intelligent Systems Vanderbilt University United States Microsoft Research Redmond United States Department of Software and Information Systems University of North Carolina Charlotte United States Complex Systems Institute United States Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology United States Media Lab. Massachusetts Institute of Technology United States ATR Intelligent Robotics and Communication Laboratories Kyoto Japan Department of Electrical and Computer Engineering University of Texas Austin United States Department of Mathematics Paine College Augusta GA United States Cycorp Austin TX United States Robotics Institute Carnegie Mellon University United States Department of Computer Sciences University of Wisconsin Madison United States University of Palermo Italy Honda Research Institute United States Navy Center for Applied Research in Artificial Intelligence Naval Research Laboratory Washington DC United States Department of Electrical Engineering and Computer Science University of Central Florida United States Department of Computer Science Johns Hopkins University United States American University of Beirut Lebanon SRI International's Artificial Intelligence Center United States

The Association for the Advancement of Artificial Intelligence (AAAI) presented the 2010 Fall Symposium Series on November 11-13, 2010. The eight symposia included Cognitive and Metacognitive Educational Systems, Commonsense Knowledge, Complex Adaptive Systems: Resilience, Robustness, and Evolvability, Computational Models of Narrative, Dialog with Robots, Manifold Learning and Its Applications, Proactive Assistant Agents and Quantum Informatics for Cognitive, Social, and Semantic Processes. Cognitive and Metacognitive Educational Systems aimed to provide a comprehensive definition of metacognitive educational systems that is inclusive of the theoretical, architectural, and educational aspects of this field. The AAAI Commonsense Knowledge Fall Symposium had the goal of bringing together the diverse elements of this community whose work benefits from or contributes to the representation of general knowledge about the world. One of the specific goals of Proactive symposium was to gather the researchers from various projects in assistant agents to share their wisdom in retrospect.

关键词： Semantics

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N-GRAM NEAREST NEIGHBOR ALGORITHM FOR VOICE PASSWORD SYSTEM

N-GRAM NEAREST NEIGHBOR ALGORITHM FOR VOICE PASSWORD SYSTEM

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IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Wu Guo Zhao Zhang Yanhua Long Lirong Dai MOE-Microsoft Key Laboratory of Multimedia Computing and Communication University of Science and Technology of China (USTC) China iFly Speech Lab Department of Electronic Engineering and Information Science University of Science and Technology of China (USTC) China

ISBN: (纸本)9781424442959

A specific issue in the voice password system is addressed in this paper: When the text content of target speaker's enrollment password has been already known by imposters, they can do a well-behaved impersonation using the same text content as the target speaker. This results in a much higher false acceptance than the traditional voice password system. N-gram based nearest neighbor algorithm is proposed here to improve the speaker detection accuracy. Furthermore, correlation coefficient is adopted as the distance measurement between two acoustic features instead of the traditional Euclidean distance. Experimental results show that the proposed method outperforms the DTW and GMM-UBM algorithms.

关键词： speaker recognition dynamic time warping nearest neighbor dynamic time warping speaker recognition Nearest neighbor Voice distance measurement Passwords nearest neighbor algorithm Loudspeakers Euclidean distance

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Differentiated Bandwidth Allocation for Reducing Server Load in P2P VOD

Differentiated Bandwidth Allocation for Reducing Server Load...

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International Conference on Grid and Cooperative Computing (GCC)

作者： Zhengjun Chena Kaiping Xue Peilin Hong Hancheng Lu University of Science and Technology of China Hefei Anhui CN MOE-MS Key Laboratory of Multimedia Computing and Communication and The Information Network Laboratory of EEIS Department University of Science and Technology Hefei China The Information Network Lab of EEIS Department University of Science and Technology of China (USTC) Hefei China The Information Network Laboratory of EEIS Department University of Science and Technology Hefei China

P2P technology offers a promising scalable solution for video-on-demand (VOD) service. Recent studies have found that departure misses are the major cause of server load in P2P-based VOD. Inspired by this finding, this paper addresses the design of bandwidth allocation policy to decrease departure misses and thereby reduce server load further. We first formulate the minimum departure misses problem. Then we propose a centralized algorithm which serves as our benchmark for all other schemes. The centralized algorithm makes use of surplus bandwidth to help peers prefetch chunks, thus reducing departure misses significantly. We then propose a distributed bandwidth allocation algorithm in which a stable peer with higher playback position is able to obtain a larger share of parentspsila upload bandwidth. A simple predictor is developed for stable node identification. Simulation results show that our distributed protocol outperforms traditional approach, and close to the centralized one.

关键词： Channel allocation Bandwidth Streaming media Peer to peer computing Network servers Web server Computer networks Grid computing Multimedia computing Prefetching

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The Underwater Acoustic OFDM Channel Estimation Based on Wavelet and MMSE

The Underwater Acoustic OFDM Channel Estimation Based on Wav...

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WRI International Conference on communications and Mobile Computing, CMC

作者： Xue-fei Ma Chun-hui Zhao Gang Qiao Key Lab. of Underwater Acoust. Technol. Nat. Defense Sci. & Technol. Harbin College of Information and Communication Engineering Harbin Engineering of Technology Harbin China Key Laboratory of Underwater Acoustic Technology National Defense Science and Technology Harbin China

In this paper we proposed a novel approach of channel estimation based on wavelet and MMSE. Recently, there have been tremendous demands for high-speed data transmission in underwater acoustic communications. Accurate channel estimation is necessary for coherent detection of the underwater acoustic orthogonal frequency division multiplexing (OFDM) signals. Pilot-assisted channel estimation using training sequence to obtains the channel information, the transmitter rate decrease rapidly along with the number of training sequence increase. We proposed a approach using less training to estimate the channel by wavelet and minimum mean Square error (MMSE), the pilot sequence before transmitting is convolutionnal encoded for the correlation of symbol, at the receive wavelet denoise is imposed to eliminate the Additive white Gaussian noise (AWGN) then using MMSE to obtain others frequency bin channel impulse response inner the same block.

关键词： Underwater acoustics OFDM Channel estimation AWGN Frequency estimation Data communication Underwater communication Acoustic signal detection Underwater tracking Transmitters

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The Underwater Acoustic MIMO OFDM System Channel Equalizer Basing on Independent Component Analysis

The Underwater Acoustic MIMO OFDM System Channel Equalizer B...

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WRI International Conference on communications and Mobile Computing, CMC

作者： Xuefei Ma Chun-hui Zhao Gang Qiao Key Lab. of Underwater Acoust. Technol. Nat. Defense Sci. & Technol. Harbin College of Information and Communication Engineering Harbin Engineering of Technology Harbin China Key Laboratory of Underwater Acoustic Technology National Defense Science and Technology Harbin China

In this paper we proposed a novel approach of blind channel equalizer for underwater multiple-input multiple-output orthogonal frequency diversity multiple (MIMO-OFDM) system. Convolutional encoder is applied on reference frequency bin and each block before entre the underwater MIMO-OFDM system. The transform imposed a correlation structure on the transmitted block, after every reference frequency signal being unmixed by fixed-point algorithm for independent component analysis (FastICA), the estimated reference are reordered and scaled. Then using minimum mean squared error (MMSE) to obtain others frequency bin channel impulse response inner the same block. We recover the user signal assuming that the channels are unknown and no training sequences are sent.

关键词： Underwater acoustics MIMO OFDM Equalizers Independent component analysis Underwater communication Convolution Sonar Mobile communication Acoustical engineering

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