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Multi-scale Modeling Approach for Detecting Low Observable Targets within Sea Clutter

Multi-scale Modeling Approach for Detecting Low Observable T...

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IEEE Conference on Aerospace

作者： Jing Hu Jianbo Gao Robert S. Lynch Genshe Chen Department of Electrical and Computer Engineering University of Florida Gainesville FL USA Naval Undersea Warfare Center Signal Processing Branch Newport RI USA Intelligent Automation Inc. Rockville MD USA

Sea clutter refers to the radar backscatter from the ocean surface. Accurate modeling of sea clutter and rough sea surface is an important problem in radar signal processing and applications, as it facilitates robust detection of low observable targets within sea clutter, which has significant importance to coastal security, navigation safety and environmental monitoring. Great efforts have been made to model sea clutter. However, the nature of sea clutter is poorly understood and the important problem of target detection within sea clutter remains a tremendous challenge. We propose a systematic, multi-scale approach to model sea clutter. By extensively utilizing available real data, we (1) develop methods to better fit non-stationary and non-Gaussian sea clutter, (2) characterize correlation structure of sea clutter on multiple time scales, and (3) develop accurate and readily implementable methods to detect low observable targets within sea clutter.

关键词： Radar detection Rough surfaces Surface roughness Sea surface Radar clutter Backscatter Oceans Radar signal processing Robustness Sea measurements

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4D wavelet noise suppression of MR diffusion tensor data

4D wavelet noise suppression of MR diffusion tensor data

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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： Hesamoddin Jahanian Azadeh Yazdan-Shahmorad Hamid Soltanian-Zadeh Department of Radiology Henry Ford Health System Image Analysis and Communications Laboratory Detroit MI USA Department of Biomedical Engineering University of Michigan Ann Arbor MI USA Controll and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran Iran

Diffusion tensor imaging (DTI) is known to be promising for providing anatomical information about white-matter fiber bundles that cannot be obtained by other non-invasive in vivo imaging methods. However, its application is limited because of its low signal-to-noise ratio and significant imaging artifacts. To improve the accuracy of tissue structural and architectural characterization with diffusion tensor imaging 4D wavelet denoising technique is used to improve the signal to noise ratio (SNR) of diffusion tensor images. To evaluate the proposed method, a high SNR data set is built by repeating and averaging the data acquisition several times and is compared to the denoised data. Our results revealed that wavelets would effectively reduce the noise in DTI data with less blurring of tissue types, especially in the white matter. It would suggest that by using the 4D wavelet noise suppression, one could decrease the acquisition time and still have an acceptable SNR.

关键词： Tensile stress Diffusion tensor imaging signal to noise ratio Noise reduction Magnetic noise Anisotropic magnetoresistance Eigenvalues and eigenfunctions In vivo Magnetic resonance imaging Wavelet analysis

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Upstream transmission in WDM PONs at 10Gbps using low bandwidth RSOAs assisted with optical filtering and electronic equalization

Upstream transmission in WDM PONs at 10Gbps using low bandwi...

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European Conference on Optical Communication (ECOC)

作者： I. Papagiannakis M. Omella D. Klonidis J. Kikidis A. N. Birbas I. Tomkos J. Prat Electrical & Computer Engineering Department University of Patras Rion Patras Greece Signal Theory & Communications Department Universitat Poliltècnica de Catalunya Barcelona Spain Athens Information Technology Center Athens Greece Analog Integrated Electronic Systems S. A. Greece

Upstream transmission at 10 Gbps over extended access fibre links is demonstrated using a low-bandwidth RSOA assisted by electronic equalization and optimum filter offset at the receiver (OLT) end.

关键词： Optical filters Wavelength division multiplexing Bandwidth Passive optical networks Filtering Optical receivers Optical transmitters Optical noise Band pass filters Optical feedback

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Towards an inclusive computational model of visual cortex

Towards an inclusive computational model of visual cortex

引用

IEEE Symposium on Bioinformatics and Bioengineering (BIBE)

作者： M. Gheiratmand H. Soltanian-Zadeh H. Khaloozadeh Electrical Engineering Department K.N. Toosi University of Technology Tehran Iran Radiology Department Henry Ford Health System Image Analysis and Communications Laboratory Detroit MI USA School of Cognitive Sciences Institute for Studies Theoretical Physics and Mathematics (IPM) Tehran Iran Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran Iran

Understanding the primatespsila visual system has been one of the challenging problems of different groups of scientists for years. Though many studies, from physiology and neuroscience to computer vision, are done on different aspects of visual processing in the cortex, a comprehensive computational model of visual cortex is still missing. We have implemented a computational model of object recognition in ventral visual pathway in our previous work. This hierarchical model covers visual areas V1/V2, V4/PIT, and AIT sending inputs to the Prefrontal Cortex (PFC) for categorization. To extend our model, in this work, we have added a simple model of motion detection in neurons of areas V1 and MT of the dorsal stream to our previous model. This has enabled the model to perform another principal function of the visual cortex, i.e., motion perception.

关键词： Brain modeling Computational modeling Neurons Biological system modeling Object recognition Motion analysis Solid modeling Visual system computer vision Motion detection

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Time delay estimation in a spatially structured model using decoupled estimators for temporal and spatial parameters

Time delay estimation in a spatially structured model using ...

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ITG Workshop on Smart Antennas

作者： Felix Antreich Josef A. Nossek Gonzalo Seco A. Lee Swindlehurst German Aerospace Center (DLR) Inst. for Communications and Navigation Wessling Germany Inst. for Circuit Theory & Signal Processing Munich University of Technology (TUM) Germany Department of Telecommunication & Systems Engineering Universitat Authnòma de Barcelona Spain Dept. of Telecommunications & Systems Engineering Universitat Autonoma de Barcelona (UAB) Spain Dept. of Electrical Engineering & Computer Science The University of California Irvine CA U.S.A.

This paper deals with the joint estimation of time-delay and spatial (direction-of-arrival, DOA) parameters of several replicas of a known signal in an unknown spatially correlated field. Unstructured and structured models have been proposed for maximum likelihood (ML) estimators in the literature. The former suffers from a severe performance degradation in some scenarios, whereas the latter involves huge complexity. It is shown how the extended invariance principle (EXIP) can be applied to obtain estimates with the quality of those of the structured model, but with the complexity of the unstructured one. We present a method to improve the quality of the time-delay estimates obtained with an unstructured spatial model when an estimate of the DOAs is available. Exemplarily, simulation results for time-delay estimation for GPS (Global Positioning System) are included and confirm that our proposal approaches the Cramer-Rao lower bound (CRLB) of the structured model even when suboptimal DOA estimates obtained by ESPRIT are introduced.

关键词： Delay estimation Delay effects

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Comparing the effect of carrier frequency offset on OFDM and single-carrier block transmission in AWGN channels

Comparing the effect of carrier frequency offset on OFDM and...

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IEEE GLOBECOM 2006 - 2006 Global Telecommunications Conference

作者： Pan, Liu Bar-Ness, Yeheskel Center for Wireless Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102

ISBN: (纸本)142440357X

Both OFDM and single-carrier block transmission (SCBT) are promising candidates for the future high date rate communication, which well handle the frequency selective channels with a low implementation complexity. However, the sensitivity to carrier frequency offset, caused by Doppler effect or the carrier frequency difference between transmitter and receiver, is always a major concern of these block transmission systems. Actually, a controversy in comparing the carrier frequency offset effect on OFDM and SCBT systems has already been witnessed in the literature for a long time. In this paper, we first analyze the effects of carrier frequency offset on these two systems, then by carefully investigating existing works, we classify the problem into two categories: carrier frequency offset analysis with compensation and without compensation. Finally, we draw conclusions based on theoretical and numerical results that the BER performance of OFDM systems is more sensitive to carrier frequency offset than SCBT systems for the BPSK modulation in AWGN channels, although the difference of the BER performance between two systems is much smaller than theoretically predicted in previous works, if a fair comparison environment is used. Moreover, this small performance gap vanishes in higher level constellation like QPSK. © 2006 IEEE.

关键词： Carrier communication

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Throughput of two-hop wireless networks with relay cooperation 45

Throughput of two-hop wireless networks with relay cooperati...

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45th Annual Allerton Conference on Communication, Control, and Computing 2007

作者： Niu, Bo Simeone, Osvaldo Haimovich, Alexander M. Somekh, Oren Center for Wireless Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology NewarkNJ07102 United States Department of Electrical Engineering Princeton University PrincetonNJ08544 United States

ISBN: (纸本)9781605600864

In this paper, we consider the throughput problem of a wireless fading network with two-hop relaying, where n single antenna source-destination pairs communicate through a set of single antenna relays using amplify-and-forward strategy Two different cooperation schemes at the relay nodes are considered, where the relays share either channel state information (CSI) or both CSI and received signals. The high level of cooperation is justified for a case where the relaying role is fulfilled by infrastructure nodes that can communicate through a wired backbone without an overhead on the wireless channel. We show that in the first case, at least n2 relays are needed to achieve linear scaling of the system throughput versus n. In the second case, exchanging the received signals at the relays can reduce the needed number of relays to n in order to achieve linear scaling. It is also shown that the second cooperation scheme achieves a strictly positive per node throughput, where the total number of nodes accounted for includes the relays.

关键词： Throughput

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The electronic passport and the future of government-issued RFID-based identification 1

The electronic passport and the future of government-issued ...

引用

1st IEEE International Conference on RFID, IEEE RFID 2007

作者： Ezovski, G. Watkins, Steve Adaptive Communications and Signal Processing Group School of Electrical and Computer Engineering Cornell University IthacaNY14850 United States Department of Electrical and Computer Engineering University of Missouri-Rolla RollaMO65409 United States

ISBN: (纸本)1424410126

Passports and other identification documents may be enhanced using recent advancements in technology. Various national and international bodies are pursuing machine-readable approaches with biometric information. In particular, the International Civil Aviation Organization (ICAO) has adopted standards whereby passports can store biometric identifiers. Countries that participate in the Visa Waiver Program (VWP) began issuing electronic passports in 2006. However, the selection of technologies remains questionable due to privacy and security concerns. This paper examines policy regarding these electronic approaches and developments toward electronic data storage and transmission. Radio-frequency identification (RFID) devices for electronic passports and other existing identity documents are discussed. © 2007 IEEE.

关键词： Biometrics

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Scalable bata multicast using expanding window fountain codes 45

Scalable bata multicast using expanding window fountain code...

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45th Annual Allerton Conference on Communication, Control, and Computing 2007

作者： Vukobratović, Dejan Stanković, Vladimir Sejdinović, Dino Fagoonee, Lina Xiong, Zixiang Department of Communications and Signal Processing University of Novi Sad Novi Sad Serbia Department of Communication Systems InfoLab 21 Lancaster University Lancaster United Kingdom Centre for Communications Research Department of Electrical and Electronic Engineering University of Bristol Bristol United Kingdom Department of Electrical and Computer Engineering Texas A and M University College StationTX United States

ISBN: (纸本)9781605600864

Digital Fountain (DF) codes were introduced as an efficient and universal Forward Error Correction (FEC) solution for data multicast over lossy packet networks. However, in real-time applications, the DF encoder cannot make use of the "rateless" property as it was proposed in the DF framework, due to its delay constraints. In this scenario, many receivers might not be able to collect enough encoded symbols (packets) to perform succesful decoding of the source data block (e.g., they are connected as a low bit-rate receivers to a high bit-rate source stream, or they are affected by severe channel conditions). This paper proposes an application of recently introduced Expanding Window Fountain (EWF) codes as a scalable and efficient solution for real-time multicast data transmission. We show that, by carefully optimizing EWF code design parameters, it is possible to design a flexible DF solution that is capable of satisfying multicast data receivers over a wide range of data rates and/or erasure channel conditions.

关键词： Forward error correction

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A spatial exploration based blind DOA estimation algorithm for closely spaced sources

A spatial exploration based blind DOA estimation algorithm f...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Feng Wan Wei-Ping Zhu M. N. S. Swamy Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

In this paper, a spatial extrapolation-based blind DOA estimation method is presented for closely spaced sources. The new method is based on the linear extrapolation of the correlation matrix using AR coefficients, which are first estimated through an initial DOA estimation. Both the initial and final DOA estimations are performed by using the ESPRIT algorithm. Unlike conventional AR coefficient estimation method which estimates AR coefficients on the snap-shot basis, our AR coefficient estimation is carried out in correlation domain once a block of snap-shots, thus significantly reducing the computational complexity of the antenna array. computer simulations show that the proposed blind DOA estimation method outperforms the conventional method in terms of the mean square-error (MSE) when the angle of separation of DO As is very small.

关键词： Direction of arrival estimation Extrapolation signal processing algorithms Linear antenna arrays Array signal processing Vectors Interpolation Multiple signal classification Wireless communication Computational complexity

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