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检索条件"任意字段=2nd IEEE Sensor Array and Multichannel Signal Processing Workshop"

共 469 条记录，以下是251-260 订阅

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Optimal design of DS-CDMA systems under multipath fading channel: array signal processing approach 2

Optimal design of DS-CDMA systems under multipath fading cha...

引用

2nd ieee workshop on signal processing Advances in Wireless Communications, SPAWC 1999

作者： Hung, Jui-Chung Chen, Bor-Sen Department of Electrical Engineering National Tsing Hua University Hsinchu300 Taiwan

ISBN: (纸本)0780355997

In this study, based on multirate technique, the detection problem of DS-CDMA systems is transformed to an equivalent signal of beamforming systems. In this situation, the channel plus spreading code in DS-CDMA systems is equivalent to a steering matrix in the signal processing of beamforming systems. Based on an optimum beamforming technique, an optimum detection design is proposed for DS-CDMA systems. Furthermore, stochastic processes model the time-varying tap coefficients of multipath fading channels. The channel parameter or steering matrix estimation algorithm is developed based on the Kalman state estimation method. Finally, an adaptive design for DS-CDMA systems is also discussed in this paper. Consistency of the proposed method is shown, and some illustrative simulations are presented. © 1999 ieee.

关键词： Beamforming

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Research on An Emulational System about Estimation of The Underwater Target Azimuth Direction Finding

Research on An Emulational System about Estimation of The Un...

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2nd International Symposium on Intelligent Information Technology Application

作者： Liu, Wei Wang, Changming Guan, Qinjin Nanjing Univ Sci & Technol Coll Mech Engn Nanjing 210094 Jiangsu Peoples R China

ISBN: (纸本)9780769535050

The choice of algorithms and the hydrophone array is the key of getting high precision in underwater targets detection. Using LabVIEW and 8 channel data acquisition card the underwater targets noise was gathered. Based on the MATLAB, the algorithms of underwater targets estimation have been confirmed The water tank experiments have shown that this system can realize to acoustic signal gathering, processing. The results obtained in this paper can give reference for array shape and algorithms selection.

关键词： Azimuth Sonar equipment Object detection Data acquisition Acoustic noise Noise shaping MATLAB Underwater acoustics signal processing Shape

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Hyper-Cam: Hyperspectral IR imaging applications in defence innovative research

Hyper-Cam: Hyperspectral IR imaging applications in defence ...

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workshop on Hyperspectral Image and signal processing

作者： Montembeault, Yan Lagueux, Philippe Farley, Vincent Villemaire, André Gross, Kevin C. Telops Inc. 100-2600 St-Jean-Baptiste Québec QC G2E 6J5 Canada Air Force Institute of Technology Wright-Patterson AFB 2950 Hobson Way Dayton OH 45433 United States

ISBN: (纸本)9781424489077

Modern defence acitivites often require sophisticated technology to enable protection of sites and troops, as well as understanding and predicting events in the battlefield. The need for protection against chemical attacks has been a military priority for decades. Similarly, the need for battlefield standoff remote sensing (target/camouflage and surface contaminants detection, IR signatures of decoys/flares/jet engines) has evolved along with theelectrooptical technologies. These areas of application require powerful detection methods through the analysis of infrared spectral signatures and recognition algorithms. Telops commercializes the Hyper-Cam, a rugged and compact infrared hyperspectral imaging sensor operating in the LWIR (8-11.5 μm) or the MWIR (1.5-5.5 μm). This paper presents some areas of application in defence innovative research where the Hyper-Cam sensor, is paving the way with unprecedented capabilities. ©2010 ieee.

关键词： Hyperspectral imaging

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On high resolution bearing estimation for scattered sources 2

On high resolution bearing estimation for scattered sources

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2nd ieee workshop on signal processing Advances in Wireless Communications, SPAWC 1999

作者： Abdellatif, T. Larzabal, P. Bardot, J.-P. Clergeot, H. LESiR - ENS Cachan. 61 av. du prbident Wilson Cachan cedex94235 France LTSMM Campus Saint Denis BP792 Cayenne Cedex97337 France

ISBN: (纸本)0780355997

Previous studies in urban wireless communications underscored an angular spread of the signals reaching the base station antenna array. In this case, many of the array processing methods based on the point source assumption produce poor performance. This paper highlights the behavior of subspace-based methods in such scenarios. A generalization of the MUSIC location algorithm to more realistic propagation models is derived, taking into account a parametric distribution of the angular density power. Moreover, this work proposes and motivates the use of linear prediction methods as an alternative for high resolution bearing estimation in presence of angular spreading. Indeed, the deconvolution of an auto-regressive spectrum permits one to obtain both the direction of arrival and the angular spread of the assumed parametric shape. A linear prediction method, optimally applied to a »Lorenz» shape of the angular distribution is also implemented. In fact, it seems that a Lorenz shape matches better experimental results than Gaussian or uniform ones. © 1999 ieee.

关键词： array processing

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MEMEA 2007 2nd - ieee International workshop on Medical Measurement and Applications

MEMEA 2007 2nd - IEEE International Workshop on Medical Meas...

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MeMeA 2007 2nd - ieee International workshop on Medical Measurement and Applications

ISBN: (纸本)1424410800

The proceedings contain 22 papers. The topics discussed include: ultrasonic anemometer for the measurement of respiratory flow in the forced oscillation technique;implementation of SPR-biosensors for express-diagnostics of acute viral infection and mycotocsicosis;measurements of generated potentials by the electrodes of a cochlear implant;measurements of generated potentials by the electrodes of a cochlear implant;evaluation of water barrier function of human skin using super fast dew point hygrometer;development of EMFI-sensor based pressure sensitive insole for gait analysis;fetal electrocardiogram signal modeling using genetic algorithm;processing EEG signals for clinical interpretation in seizure-suspected patients;multiple channel electrooculogram classification using automata;haptic exercises for measuring improvement of post-stroke rehabilitation patients;and signal-shape locked loop (SSLL) as an adaptive separator of cardiac and respiratory components of bio-impedance signal.

关键词： Electrodes

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DOA-based adaptive array antenna testbed system

DOA-based adaptive array antenna testbed system

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ieee Topical Conference on Wireless Communication Technology/2nd Wireless Grantees workshop

作者： Kim, M Ichige, K Arai, H Yokohama Natl Univ Div Elect & Comp Engn Yokohama Kanagawa 240 Japan

ISBN: (纸本)0780381963

In recent and future wireless cellular communications, Co-Channel Interference (CCI) is very critical problem. At basestation, adaptive array antenna technology exploiting spatial domain filtering with antenna array and digital signal processing can combat the CCI, thus the system capacity can be increased. Most algorithms for adaptive array antenna system have been studied. Most algorithms usually need directions of arrival (DOAs) of desired and interferer signals in advance. The DOA-based adaptive array antenna systems make use of the estimated DOAs in a beamformer in order to separate the desired signal from interferers spatially. But, of course, there are other types of algorithms that exploit temporal reference and not need the DOA information. The performance of DOA,-based beamforming is superior to that of other types of algorithms for small angular spread, while it has time-consuming tasks due to its large amount of computational burden [1]. © 2003 ieee.

关键词： Direction of arrival

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Feature Detection and Tracking with the Dynamic and Active-pixel Vision sensor (DAVIS) 2

Feature Detection and Tracking with the Dynamic and Active-p...

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2nd International Conference on Event-Based Control, Communication, and signal processing (EBCCSP)

作者： Tedaldi, David Gallego, Guillermo Mueggler, Elias Scaramuzza, Davide Univ Zurich Robot & Percept Grp Dept Informat CH-8006 Zurich Switzerland

ISBN: (纸本)9781509041961

Because standard cameras sample the scene at constant time intervals, they do not provide any information in the blind time between subsequent frames. However, for many high-speed robotic and vision applications, it is crucial to provide high-frequency measurement updates also during this blind time. This can be achieved using a novel vision sensor, called DAVIS, which combines a standard camera and an asynchronous event-based sensor in the same pixel array. The DAVIS encodes the visual content between two subsequent frames by an asynchronous stream of events that convey pixel-level brightness changes at microsecond resolution. We present the first algorithm to detect and track visual features using both the frames and the event data provided by the DAVIS. Features are first detected in the grayscale frames and then tracked asynchronously in the blind time between frames using the stream of events. To best take into account the hybrid characteristics of the DAVIS, features are built based on large, spatial contrast variations (i.e., visual edges), which are the source of most of the events generated by the sensor. An event-based algorithm is further presented to track the features using an iterative, geometric registration approach. The performance of the proposed method is evaluated on real data acquired by the DAVIS.

关键词： Iterative methods

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The measured effects of GPS Flex power capability collected on sensor Station data

The measured effects of GPS Flex power capability collected ...

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5th ESA workshop on Satellite Navigation Technologies / European workshop on GNSS signals and signal processing (NAVITEC)

作者： Jimenez-Banos, D. Perello-Gisbert, J. V. Crisci, M. ESA ESTEC Radio Nav Syst & Tech TEC ETN Noordwijk Netherlands

ISBN: (纸本)9781424487417

In a scenario in which several GNSS systems, GPS, Galileo, GLONASS, COMPASS, QZSS, are planning to coexist in the same frequency band, spectra/signal structure management and relative power levels are the main instruments to counteract the possible impact of intersystem interference, and the ability to increase the transmit power on individual signal components from GNSSs system providers has become an important feature of the modernized satellite payloads. Among the modernizations that GPS Block IIR-M and IIF Space Vehicles payload underwent, one of them is the capability of programmable power output also known as "flex power" capability. The flex power capability enables operators of the system to increase the signal strength of the military P(Y) and M-code signals, if needed by Department of Defense (DoD) and allied GPS users. The 2nd Space Operations Squadron (2SOPS) experimented, over the course of five days during the month of September, the use of this programmable power output capability in several SVs. This paper provides an analysis of the C/No measured from sensor stations where the transmit power level changes that GPS satellites underwent during the days from the 7th of September 2010 to the 12th can be assessed. Moreover, a theoretical analysis based on real measurements collected with the STFC (UK) 25m Radio Observatory [1] is presented, providing a possible explanation on how the flex power capability may have been implemented on board.

关键词： GNSS Modernizations Power measurements Interference Radiofrequency compatibility

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Proceedings of the 1997 2nd ieee-CAS Region 8 workshop on Analog and Mixed IC Design

Proceedings of the 1997 2nd IEEE-CAS Region 8 Workshop on An...

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Proceedings of the 1997 2nd ieee-CAS Region 8 workshop on Analog and Mixed IC Design

The proceedings contains 24 papers from the 1997 2nd ieee-CAS Region 8 workshop on Analog and Mixed IC Design. Topics discussed include: analog/digital interface in submicron IC's;low power/low voltage circuits;low power, low-voltage ROMs;intermediate frequency-sampling modulators;high-performance modulator design using computer aided design tools;IC microsensors;CMOS readout chip for pixel detectors;tunable perceptual microsystem for stereo depth estimation;capacitive sensors;silicon vertex track detector;dynamic translinear circuits;current mode and translinear design;programmable pulse based mixed-signal processing VLSI;high-accuracy high-speed continuous-time current comparators;and massively-parallel analog array processors.

关键词： Integrated circuit layout

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Semi-blind symbol synchronization for antenna array signal processing in short burst multiuser SDMA systems 2

Semi-blind symbol synchronization for antenna array signal p...

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2nd ieee workshop on signal processing Advances in Wireless Communications, SPAWC 1999

作者： Kuzminskiyt, Alexandr M. Hatzinakos, Dimitrios Bell Laboratories Lucent Technologies Unit 1 Pagoda Park Westmead Drive Swindon WiltshireSN5 7YT United Kingdom Dept. of Electrical and Computer Engineering University of Toronto TorontoONM5S 3G4 Canada

ISBN: (纸本)0780355997

The problem of symbol synchronization for semi-blind antenna array signal processing in digital communications is considered. It is relevant to situations where the location of known training symbols within a slot of received data is not known. Training based and blind techniques have been employed to address this problem but they become ineffective when the length of the training sequence and/or the data received under quasi-stationary conditions is not sufficiently long. A more effective semi-blind solution is proposed in this paper. A synchronization algorithm is developed and compared with the known training-based algorithm by means of computer simulations. The testing and evaluation conditions correspond to those of short burst multiuser Spatial Division Multiple Access (SDMA) systems. © 1999 ieee.

关键词： Antenna arrays

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