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检索条件"主题词=Detection Algorithms"

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An Efficient MIMO V-BLAST Decoder Based on a Dynamically Reconfigurable FPGA Including its Reconfiguration Management

An Efficient MIMO V-BLAST Decoder Based on a Dynamically Rec...

引用

IEEE International Conference on Communications (ICC)

作者： H. Wang P. Leray J. Palicot SUPELEC/IETR Cesson-Sevigne France

This paper introduces a reconfigurable MIMO V-BLAST (vertical Bell Laboratories layered space-time) square root decoder that is CORDIC operators based, allows for dynamically changing the interconnections between the CORDIC (coordinate rotation digital computer) operators. These interconnections of CORDIC operators are implemented in a partial reconfigurable part of FPGA using the dynamic reconfiguration method which improves both the reconfiguration time and the area efficiency. Moreover, this reconfiguration time improvement is increased thanks to the MicroBlaze (within the FPGA) in which is included the reconfiguration management. This MIMO square root decoder is mapped on a Xilinx Virtex-4, showing the configuration time improvement, area efficiency and flexibility of the decoder by using the dynamic partial reconfiguration method.

关键词： MIMO Field programmable gate arrays Maximum likelihood decoding Signal processing algorithms Detectors Bit error rate Communications Society Wireless communication detection algorithms Hardware

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A new method for frame synchronization in OFDMA mode of WMAN

A new method for frame synchronization in OFDMA mode of WMAN

引用

IEEE Region 10 International Conference TENCON

作者： K. Pushpa Ch. Nanda Kishore Y. Yoganandam Osmania University Hyderabad India HelloSoft (India) Private Limited Hyderabad India

In this paper, we propose a new method for frame synchronization in OFDMA mode of WMAN. The scheme is based on the preamble suggested for OFDMA mode of WMAN where the preamble consists of real subsymbols and OFDMA data symbols contain complex subsymbols for each frame. The proposed method is independent of frequency offset and results in sharp peak at the frame boundary. A simple approach for selecting appropriate threshold to detect the frame boundary is presented. Simulations are conducted for AWGN and frequency selective channels to demonstrate the performance of the proposed method. Further, the performance of the proposed method is compared with that of the existing methods and it is found that the proposed method exhibits better performance as compared to that of existing methods.

关键词： Frequency synchronization Timing Binary phase shift keying OFDM modulation Interchannel interference AWGN detection algorithms Quadrature phase shift keying Quadrature amplitude modulation Wireless LAN

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Trustworthiness and Confidence of Peers in Peer-to-Peer (P2P) Network

Trustworthiness and Confidence of Peers in Peer-to-Peer (P2P...

引用

International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Yoshio Nakajima Alireza Goudarzi Nemati Tomoya Enokido Makoto Takizawa Tokyo Denki University Japan Rissho University Japan

In a peer-to-peer (P2P) overlay network, a peer process (peer) communicates with other peers and manipulates objects like databases in the peers. It is critical to obtain service information on what peers support what service. In a fully distributed, unstructured P2P network, there is no centralized coordinator. It is critical for a peer to identify which acquaintance is trustworthy since acquaintances may support obsolete service information and may be faulty. There are subjective and objective types of the trustworthiness of each acquaintance. In the subjective approach, a peer obtains the trustworthiness of an acquaintance by itself through communicating with an acquaintance. On the other hand, a peer takes trustworthiness opinions on an acquaintance from other peers, In this paper, a peer only takes opinions of trustworthy peers by excluding faulty peers. A peer has to decide on which trustworthiness type is taken. In this paper, we postulate the more the peer is confident of its trustworthiness opinion, the more the subjective trustworthiness is taken into account.

关键词： Peer to peer computing Object detection Electronic mail Fault diagnosis Indexes Distributed databases Floods Permission detection algorithms

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On the sustained tracking of human motion

On the sustained tracking of human motion

引用

International Conference on Automatic Face and Gesture Recognition

作者： Yaser Ajmal Sheikh Ankur Datta Takeo Kanade Robotics Institute Carnegie Mellon University Pittsburgh PA USA

In this paper, we propose an algorithm for sustained tracking of humans, where we combine frame-to-frame articulated motion estimation with a per-frame body detection algorithm. The proposed approach can automatically recover from tracking error and drift. The frame-to-frame motion estimation algorithm replaces traditional dynamic models within a filtering framework. Stable and accurate per-frame motion is estimated via an image-gradient based algorithm that solves a linear constrained least squares system. The per-frame detector learns appearance of different body parts and dasiasketchespsila expected gradient maps to detect discriminant pose configurations in images. The resulting online algorithm is computationally efficient and has been widely tested on a large dataset of sequences of drivers in vehicles. It shows stability and sustained accuracy over thousands of frames.

关键词： Tracking Humans Motion estimation detection algorithms Heuristic algorithms Filtering algorithms Vehicle dynamics Biological system modeling Least squares approximation Detectors

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An array antenna processing algorithm for collaborative MIMO system

An array antenna processing algorithm for collaborative MIMO...

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Asia-Pacific Conference on Microwave

作者： Chang-eui Shin Seungwon Choi HY-SDR The School of Electrical Computer and Communication Engineering Hanyang University Seoul South Korea

This paper has presented design and performance analysis of CSM combined with beamforming and 2times8 ML detection. The goal of this paper is the reduction of computational complexity and the improvement of performance of the CSM with array antenna system using beamforming scheme. The simulation result shows that proposed algorithm provides the better performance than conventional algorithm and the comparison of the computational complexity shows that proposed algorithm can decrease computational burden dramatically.

关键词： Antenna arrays Collaboration MIMO Transmitting antennas Mobile antennas Receiving antennas Base stations Array signal processing AWGN detection algorithms

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SNAP, Small-world Network Analysis and Partitioning: An open-source parallel graph framework for the exploration of large-scale networks

SNAP, Small-world Network Analysis and Partitioning: An open...

引用

International Symposium on Parallel and Distributed Processing (IPDPS)

作者： David A. Bader Kamesh Madduri College of Computing Georgia Institute of Technology USA

We present SNAP (small-world network analysis and partitioning), an open-source graph framework for exploratory study and partitioning of large-scale networks. To illustrate the capability of SNAP, we discuss the design, implementation, and performance of three novel parallel community detection algorithms that optimize modularity, a popular measure for clustering quality in social network analysis. In order to achieve scalable parallel performance, we exploit typical network characteristics of small-world networks, such as the low graph diameter, sparse connectivity, and skewed degree distribution. We conduct an extensive experimental study on real-world graph instances and demonstrate that our parallel schemes, coupled with aggressive algorithm engineering for small-world networks, give significant running time improvements over existing modularity-based clustering heuristics, with little or no loss in clustering quality. For instance, our divisive clustering approach based on approximate edge betweenness centrality is more than two orders of magnitude faster than a competing greedy approach, for a variety of large graph instances on the Sun Fire T2000 multicore system. SNAP also contains parallel implementations of fundamental graph-theoretic kernels and topological analysis metrics (e.g., breadth-first search, connected components, vertex and edge centrality) that are optimized for small- world networks. The SNAP framework is extensible; the graph kernels are modular, portable across shared memory multicore and symmetric multiprocessor systems, and simplify the design of high-level domain-specific applications.

关键词： Open source software Large-scale systems Algorithm design and analysis Multicore processing Kernel detection algorithms Design optimization Social network services Performance analysis Clustering algorithms

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Web-Based Intelligent Photo Browser for Flood of Personal Digital Photographs

Web-Based Intelligent Photo Browser for Flood of Personal Di...

引用

IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Yuki Orii Takayuki Nozawa Toshiyuki Kondo Tokyo University of Agriculture슠and슠Technology Koganei Tokyo Japan

We developed a Web-based intelligent photo browser which enables automatic clustering of unstructured personal digital photo collection. We conducted user studies to assess the usability of the developed photo browser (APC, automatic photo classifier) compared with an unstructured one. The user task adopted here was finding some of target pictures indicated by an experimenter from personal or somebody elsepsilas photo collections. The results show that APC is better in the case of the personal photographs while it requires much time for otherspsila photo collections. It was suggested that the glance of a photo browser should be considered according to whether the photographs had been taken by the user.

关键词： Floods Intelligent agent Humans Usability Digital cameras Agriculture detection algorithms Operating systems Microcomputers Clustering methods

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An Interleaver-Based Asynchronous Cooperative Diversity Scheme for Wireless Relay Networks

An Interleaver-Based Asynchronous Cooperative Diversity Sche...

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IEEE International Conference on Communications (ICC)

作者： Z. Fang L. Li Z. Wang Department of Communications Science and Engineering Fudan University Shanghai China

Distributed space time coding can achieve full spatial diversity in wireless relay networks. However, it requires accurate symbol-level synchronization and priori coordination between cooperative relay terminals, which is difficult to implement in distributed networks. In this paper, we propose a novel scheme based on interleaving to achieve cooperative diversity in both synchronous and asynchronous networks with little protocol overhead. A low complexity iterative detection algorithm is also proposed to combine signals from different relays at the receiver. The simulation results demonstrate the comparable performance to space-time codes based cooperative schemes which require perfect synchronization and coordination.

关键词： Relays Protocols Space time codes Broadcasting detection algorithms Transmitting antennas Decoding Cultural differences Interleaved codes MIMO

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Detecting the MB1 with Higher-Order Statistics

Detecting the MB1 with Higher-Order Statistics

引用

International Conference on Computational Intelligence and Security

作者： Donghui Hu Lina Wang Xiaqiu Jiang Tingting Zhu Yuntao Yue School of Computer Science and Information Hefei University of Technology Hefei China School of Computer Science Wuhan University of China Wuhan Hubei China The Key Laboratory of Aerospace Information Security and Trust Computing Ministry of Education Wuhan Hubei China

ISBN: (纸本)9781424441969

MB1 is a very promising steganography. In this paper, a novel steganalysis scheme is presented to detect MB1. Many experiments are carried out based on high order features, and some useful propositions are learned from those experimental results. Based on those propositions we propose an effective MB1 detection algorithm. Experimental results show that the new proposed method has outperformed the existing MB1 steganalysis method in detection reliability.

关键词： Higher order statistics Steganography Information security Computer science detection algorithms Art Calibration Histograms Computational intelligence Computer security

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Detecting wormhole attacks in wireless networks using local neighborhood information

Detecting wormhole attacks in wireless networks using local ...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Wassim Znaidi Marine Minier Jean-Philippe Babau INSA CITI Villeurbanne France

ISBN: (纸本)9781424426430

Wormhole attacks enable an attacker with limited resources and no cryptographic material to disrupt wireless networks. In a wormhole attack, an attacker records packets (or bits) at one location in the network, tunnels them (possibly selectively) to another location and retransmits them there into the network. In this paper, we present an algorithm for detecting and thus defending against wormhole attacks in wireless multi-hop networks. This algorithm uses only local and neighborhood information without requiring clock synchronization, location information or dedicated hardware. Moreover, the algorithm is independent of wireless communication models. We present simulation results for grid-like topologies and for random topologies and show that the algorithm is able to detect wormhole attacks in all cases whereas the number of false alarms (false detections) decreases rapidly if the network is sufficiently dense.

关键词： Wireless networks Network topology Routing protocols Wireless sensor networks Communication system security Hardware Wireless communication detection algorithms Cryptography Spread spectrum communication

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