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检索条件"主题词=Detection algorithms"

共 7382 条记录，以下是251-260 订阅

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Soft-decision output at sequential detection algorithms in digital mobile radio systems

Soft-decision output at sequential detection algorithms in d...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： G. Zimmermann W. Rupprecht Institute of Communication Engineering University of Kaiserslautern Kaiserslautern Germany

To improve the performance of the channel decoding in receivers for digital mobile radio systems the detector should be able to deliver reliability information about the symbol decisions (soft-decision). This paper is concerned with procedures which allow a soft-decision output at sequential detection algorithms. Simulation results obtained with these algorithms for the GSM system show the achievable gain over hard-decision detectors and allow a comparison to the more complex Soft-Output Viterbi-algorithm.< >

关键词： detection algorithms Land mobile radio GSM Detectors Maximum likelihood estimation Speech Maximum likelihood decoding Receivers Data communication Fading

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A comparative study of MIMO detection algorithms for wideband spatial multiplexing systems

A comparative study of MIMO detection algorithms for wideban...

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IEEE Conference on Wireless Communications and Networking

作者： Jingming-Wang B. Daneshrad Electrical Engineering Department University of California Los Angeles CA USA

The implementation of wideband MIMO systems poses a major challenge to hardware designers due to the huge processing power required for MIMO detection. To achieve this goal with a complete VLSI solution, channel coding and MIMO detection are preferably separated so that each of them can be fitted into a single chip. In this paper, a comparative study is presented regarding various uncoded adaptive and non-adaptive MIMO detection algorithms. Intended to serve as a reference for system designers, this comparison is performed from several different perspectives including theoretical formulation, simulated BER/PER performance, and hardware complexity. All the simulations are conducted within MIMO-OFDM framework and with a packet structure similar to that of the IEEE 802.11a/g standard. As the comparison results show, the RLS algorithm appears to be an affordable solution for a wideband MIMO system targeted at gigabit wireless transmission. As a direct result of this work, an ASIC for a 25 MHz wideband 8 /spl times/ 8 MIMO-OFDM system using RLS has been designed and fabricated.

关键词： MIMO detection algorithms Wideband Hardware Channel coding Very large scale integration Resonance light scattering Receiving antennas Signal detection Wireless communication

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A decision-theoretic approach to evaluate radiation detection algorithms

A decision-theoretic approach to evaluate radiation detectio...

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IEEE Conference on Technologies for Homeland Security

作者： Mallory A. Nobles Landon H. Sego Scott K. Cooley Luke J. Gosink Richard M. Anderson Spencer E. Hays Mark F. Tardiff Applied Statistics and Computational Modeling Group Pacific Northwest National Laboratory Richland WA Puget Sound Institute University of Washington Tacoma Tacoma WA Department of Statistical Sciences and Operations Research Virginia Commonwealth University Richmond VA

There are a variety of sensor systems deployed at border crossings and ports of entry throughout the world that scan for illicit nuclear material. These systems employ detection algorithms that interpret the output of the scans and determine whether additional investigation is warranted. In this work, we demonstrate an approach for comparing the performance of such detection algorithms. We optimize each algorithm by minimizing risk, which considers the probability distribution of threat sources and the consequence of detection errors. Our method is flexible and is easily adapted to many different assumptions regarding the probability of a conveyance containing illicit material and the relative consequences of false positive and false negative errors. This approach can help developers and decision makers identify optimal settings for these algorithms. We illustrate the method by comparing the risk from two families of detection algorithms and discuss the generalizability of the method.

关键词： Algorithm design and analysis Prediction algorithms Materials Radiation detectors detection algorithms Sensitivity Educational institutions

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A Parallel LFR-like Benchmark for Evaluating Community detection algorithms

A Parallel LFR-like Benchmark for Evaluating Community Detec...

引用

IEEE International Symposium on Parallel and Distributed Processing Workshops and Phd Forum (IPDPSW)

作者： George M. Slota Jack Garbus Rensselaer Polytechnic Institute Troy NY

ISBN: (数字)9781728174457

ISBN: (纸本)9781728174570

Community detection is one of the most widely-used graph analytics. As recent community detection algorithms have been targeting large-scale networks, an emerging problem is how best to evaluate the output of these algorithms. Common measures such as modularity have several well-known issues, so comparisons against a notion of a “ground truth” community structure, such as in the Lancicinetti-Fortunato-Radicchi (LFR) benchmark, is preferred. This current work targets the parallel generation of graphs matching the specifications of the LFR benchmark. We are able to generate such graphs at the billion-edge scale in seconds, giving orders-of-magnitude speedup relative to prior work.

关键词： Benchmark testing Generators Instruction sets Twitter Complexity theory Probabilistic logic detection algorithms

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Misregistration errors in change detection algorithms and how to avoid them

Misregistration errors in change detection algorithms and ho...

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IEEE International Conference on Image Processing

作者： D. Farin P.H.N. de With University슠of슠Technology Eindhoven Eindhoven Netherlands

Background subtraction is a popular algorithm for video object segmentation. It identifies foreground objects by comparing the input images with a pure background image. In camera-motion compensated sequences, small errors in the motion estimation can lead to large image differences along sharp edges. Consequently, the errors in the image registration finally lead to segmentation errors. This paper proposes a computationally efficient approach to detect image areas having a high risk of showing misregistration errors. Furthermore, we describe how existing change detection algorithms can be modified to avoid segmentation errors in these areas. Experiments show that our algorithm can improve the segmentation quality. The algorithm is memory efficient and suitable for real-time processing.

关键词： detection algorithms Cameras Change detection algorithms Object segmentation Image edge detection Image segmentation Motion estimation Partitioning algorithms Object detection Sprites (computer)

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Incident detection algorithms for COMPASS - An advanced traffic management system

Incident detection algorithms for COMPASS - An advanced traf...

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Vehicle Navigation and Information Systems Conference

作者： P.H. Masters J.K. Lam Kam Wong Ministry of Transportation of Ontario Canada National Engineering Technology Corporation

Advanced Traffic Management Systems (ATMS) provide the means for local transportation officials to monitor traffic conditions, adjust traffic operations, and respond to accidents. By providing early traffic incident detection and management, and by redistributing traffic to less congested portions of the highway network, ATMS can influence vehicle operators' route choices. COMPASS, a state-of-the-art advanced traffic management system implemented in the Metropolitan Toronto area, has adopted most of the Intelligent Vehicle-Highway Systems (IVHS) technologies. This paper describes the logic and implementation of the automatic incident detection for COMPASS. The purpose of incident detection is to identify the potential occurrence of incidents in a traffic stream by analyzing the flow characteristics of the traffic stream. The output of the incident detection function will form the basis for incident verification by the operator and implementation of traffic response plans. Two incident detection algorithms have been developed for the system, namely the All Purpose Incident detection (APID) algorithm and the Double Exponential Smoothing (DES) algorithm. The APID algorithm is based on the California incident detection algorithms which have the general structure of a binary decision tree. The algorithm has been designed to handle different traffic patterns. For example, the light/medium traffic incident detection routines are more suitable for detecting incidents at light/medium traffic conditions than the general incident detection routine. Furthermore, the false alarm rate may be reduced by introducing the compression wave test and persistence test. The DES algorithm makes use of a short-term forecasting technique for detecting irregularities of a traffic variable (e.g. volume) in a time series. A tracking signal is obtained by dividing the cumulative error of a traffic variable (e.g. volume) by the current standard deviation of the same variable. An incident will be

关键词： detection algorithms Telecommunication traffic Logic Testing Transportation Condition monitoring Road accidents Vehicle detection Automated highways Road vehicles

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Research of spectrum holes detection algorithms for cognitive radio

Research of spectrum holes detection algorithms for cognitiv...

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International Conference on Communication Technology (ICCT)

作者： Dong Chunli Yang Zhen Zhang Hui Tian Feng Wang Li College of Communication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing China National Mobile Communications Research Laboratory Southeast University Nanjing Nanjing China Nanjing College of Traffic Vocational Technology Nanjing China

The experience of ubiquitous and seamless access to heterogeneous mobile communication networks is one of the core issues of today's research. One important issue is the reliable detection of spectrum holes. in this paper, we address three important spectrum holes detection algorithms in cognitive wireless networks: MTM-SVD based spectrum holes detection algorithm, Kalman filtering Predictor and Particle filtering predictor. A detailed analysis and the specific steps are given.

关键词： Adaptation model Filtering Prediction algorithms Filtering algorithms Computational modeling Wireless networks detection algorithms

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Implementation of control and detection algorithms for utility interfaced power conversion systems

Implementation of control and detection algorithms for utili...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： T. Thacker F. Wang R. Burgos D. Boroyevich Center for Power Electronics Systems The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

This paper presents experimental results from the hardware implementation of a power conversion system (PCS), and its islanding control and detection algorithms, for a distributed generation (DG) unit's interface to the utility grid. The control and detection schemes implemented are shown in simulations to be stable and effective. The algorithms allow for not only transient control between modes of operation (grid-connected to stand-alone, islanding, modes) but for the elimination of nondetection zones (NDZ) and the autonomous operation of the PCS from the grid. The simulations show that the concepts of the algorithms are feasible, while the hardware implementation, via power electronics building blocks (PEBBs), shows the results that validate them.

关键词： Control systems detection algorithms Power conversion Personal communication networks Power system reliability Distributed control Power system transients Power systems Density estimation robust algorithm Power electronics

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Robustness of polarimetric detection algorithms against steering mismatches

Robustness of polarimetric detection algorithms against stee...

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European Radar Conference (EURAD)

作者： Vsevolod Kovalenko Piet van Genderen TU Delft-EWI Netherlands

We analyze robustness of several multichannel radar detection algorithms to mismatches in the steering vector. In particular, we address the scenario of a staged detection, where a history of measurements provides the region of interest and a-priori polarimetric target signatures for a target. The four second stage detection approaches - optimally weighed span, Kellypsilas and Robeypsilas detectors, and Gerlachpsilas secondary data free detector - are considered using these polarimetric features. The evaluation based on recordings of real natural scenes and both real and artificially inserted extended objects concerns robustness of these algorithms to mismatches in the steering vector. It has been observed - for different ground clutter environments into which extended target is placed - that Kellypsilas detector provides the best detection but may suffer severely from the mismatch, Gerlachpsilas detector while allowing higher probability of false alarms, produces the most stable performance and Robeypsilas matched filter gives a suitable trade-off.

关键词： Robustness detection algorithms Radar detection Detectors Algorithm design and analysis History Particle measurements Layout Clutter Matched filters

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Single-user detection algorithms for space-time block coded DS/CDMA transmissions over multipath fading channels

Single-user detection algorithms for space-time block coded ...

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IEEE Conference on Vehicular Technology (VTC)

作者： S.N. Nazar I.N. Psaromiligkos Department of Electrical & Computer Engineering McGill University Montreal QUE Canada

We consider a combined space-time (ST) block coding and direct-sequence code division multiple access (DS/CDMA) scheme for downlink transmissions over multipath fading channels, in which ST block coding is performed at the chip level, i.e. after code spreading. For this scheme, we develop low complexity and low decoding delay linear ST single-user detection algorithms. In addition, we demonstrate that by exploiting the signal structure imposed by the chip-level ST block coding, blind channel multipath estimation (with only a scalar ambiguity) is feasible, even with the assignment of a single code vector to each user.

关键词： detection algorithms Multiaccess communication Fading Block codes Decoding Downlink Multiuser detection Blind equalizers Nonlinear filters Delay estimation

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