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检索条件"任意字段=Advanced Signal Processing: Algorithms, Architectures, and Implementations V"

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Direction-of-arrival estimation in unknown correlated noise using MUSIC and higher order statistics

Direction-of-arrival estimation in unknown correlated noise ...

引用

advanced signal processing: algorithms, architectures, and implementations v

作者： Hung, Hsien-Sen Chen, Keshi Iowa State Univ. Ames IA USA

ISBN: (纸本)0819416207

In this paper we consider the direction-of-arrival (DOA) estimation of Gaussian signals in non- Gaussian noise of unknown spatial correlations. The proposed method involves two primary steps. Firstly, the third-order cumulant function of the random wavefield received by an array of sensors is estimated and then projected onto the correlation domain to exploit the correlations of noise across the sensors in an array. Secondly, the estimated noise correlation matrix is then utilized in a correlation-based eigenstructure method, such as MUSIC, for DOA estimation. As expected, the proposed method improves the performance of MUSIC which requires the knowledge of noise correlation. Numerical simulation results for both the MUSIC and proposed algorithms are presented and compared.

关键词： signal processing

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Innovative implementation and simulation of signal processing algorithms for the ASTP & DITP programs.

Innovative implementation and simulation of signal processin...

引用

Conference on signal and Data processing of Small Targets

作者： DeChaine, MD Kinashi, Y Nichols Res Corp Arlington VA 22202 USA

ISBN: (纸本)0819428221

An innovative approach is being used to implement and simulate the infrared (IR) and laser radar signal processing algorithms for the advanced Sensor Technology Program (ASTP) and the Discrimination Interceptor Technology Program (DITP). Although the algorithms will run on four different computer architectures, they will use the same source code for all implementations. The initial development and testing will occur in Mathcad on a Windows 95/NT personal computer, then move to simulation on a Silicon Graphics (SGI) workstation, then to scaled real-time simulation on a parallel high performance computer (HPC), and finally to the actual flight processor, the miniaturized parallel Wafer Scale signal Processor (WSSP) with a MIMD (multiple-instruction and multiple data) architecture. This flexibility is accomplished with code wrappers that implement interchangeable interface layers for the code modules, one wrapper for Mathcad matrices, one for C++ objects on the workstation, one for message passing with static routing on the HPC, and one for dynamically routed message passing on the WSSP. With this approach, developers can move modules back and forth from the workstation simulation environment to the implementation hardware. This will eliminate the need to maintain different versions of the same algorithm. The signal processing algorithms will be modified to work in a massively parallel architecture, with a message passing interface, which is simulated on the Silicon Graphics workstation, emulated on the HPC, and implemented on the WSSP. This approach will allow for pipeline processing as well as multiple, concurrently running instances of modules. In addition, innovative algorithms will fuse active laser radar detections and passive multicolor IR sensor measurements to improve target state estimation.

关键词： signal processing algorithms parallel processing simulation infrared sensors laser radar ballistic missile defense

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3D Object Matching on the GPU Using Spin-Image Surface Matching

3D Object Matching on the GPU Using Spin-Image Surface Match...

引用

Conference on advanced signal processing algorithms, architectures, and Implementantions XvIII

作者： Davis, Nolan Braunreiter, Dennis Tebcherani, Cezario Tanida, Masatoshi Sci Applicat Int Corp San Diego CA 92121 USA

ISBN: (纸本)9780819472946

Spin-image surface matching is a technique for locating objects in a scene by processing three-dimensional surface information from sources such as light detection and ranging (LIDAR), structured light photography, and tomography. It is attractive for parallel processing on graphics processing units (GPUs) because the two main computational steps matching pairs of spin-images by correlation, and matching pairs of points between model and scene - are explicitly parallel. By implementing these parallel computations on the GPU, as well as recasting serial portions of the algorithm into a parallel form and structuring the algorithm to limit data exchanges between host and GPU, this project achieved an overall speedup of 20 times or more compared to conventional serial processing. A demonstration application has been developed that allows users to select among a set of models and scenes and then applies the spin-image surface matching algorithm to match the selected models to the scene. It also has several user interface controls for changing parameters. One new parameter is a geometric consistency ratio (GCR) that quantifies the matching performance and provides a measure for discarding low-quality matches. By toggling between GPU- and host-based processing, the application demonstrates the speedup achieved with parallelization on the GPU.

关键词： spin image surface matching object matching image correlation geometric consistency GPU graphical processing unit parallel processing speedup

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Highly scalable hardware accelerator for digital signal processing

Highly scalable hardware accelerator for digital signal proc...

引用

advanced signal processing: algorithms, architectures, and implementations v

作者： Chi, Chi-Hung Lau, Siu-Chung Chinese Univ. of Hong Kong Shatin NT Hong Kong

ISBN: (纸本)0819416207

In this paper, a highly scalable hardware accelerator design for digital signal processing is presented. The key features of this accelerator are minimum I/O operations, highly scalable massive parallelism, easy programming, and modularity and regularity. With a very large register file (> 1000) per processing element, the reuse factor per datum in this accelerator can be increased significantly (as compared to traditional DSP architectures). System performance is improved because the amount of data transfer between the on-chip cache and the off-chip cache/memory is reduced by the same factor. Since the basic building block of this accelerator is simply a vLSI chip with several processing elements, scalable massive parallelism can be achieved by connecting multiple chips together in a SIMD `vector- like' fashion. Finally, programming of this accelerometer is not difficult because it is operated under the SIMD `vector-like' mode. With the expected vLSI technology in the next few years, the throughput of one single accelerator chip can approach GFLOPs performance. Hence, the high computing power needed by digital signal processing applications can be provided by just connecting a small number of this chip together.

关键词： Computer hardware

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STRAIGHTFORWARD IMPLEMENTATION OF DSP algorithms ON SYSTOLIC ARRAYS

STRAIGHTFORWARD IMPLEMENTATION OF DSP ALGORITHMS ON SYSTOLIC...

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5TH ANNUAL EUROPEAN COMPUTER CONF : advanced COMPUTER TECHNOLOGY, RELIABLE SYSTEMS AND APPLICATIONS

作者： BAGAINI, C BALBONI, A BINDA, C PORTA, M RAMPA, v SCIUTO, D CEFRIEL Milano Italy

ISBN: (纸本)0818621419

The status of the work on a high-level synthesis framework able to automatically generate an optimal architecture that implements a generic digital signal processing (DSP) algorithm is reported. Defining class-oriented architectural synthesis environments seems to be the key point for an efficient silicon compilation. The synthesis system is limited only to DSP algorithms defined in local recursive form, but, in the future, it will be extended to different architectures.

关键词： signal processing

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Massively parallel signal processing architecture based on response of retina cells

Massively parallel signal processing architecture based on r...

引用

advanced signal processing: algorithms, architectures, and implementations v

作者： Wilkins, Nathan A. Abushagur, Mustafa A. Caulfield, H.John COLSA Corp. Ft. Payne AL USA

ISBN: (纸本)0819416207

A massively parallel signal and image processing architecture is considered. The architecture is comprised of 2D arrays of cells that simulate the response of retina neurons. The results of simulations are compared to previously published experimental results and the system is applied to detection of spatio-temporal features in sequences of images representative of pulse- doppler radar images. By arranging the output layer so that the cells respond to various key input features an array of feature extraction cells can be obtained. The system is characterized by developing an image space to feature space mapping.

关键词： Computer vision

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Regularization approach for signal extrapolation with wavelets

Regularization approach for signal extrapolation with wavele...

引用

advanced signal processing: algorithms, architectures, and implementations v

作者： Lin, Li-Chien Kuo, C.-C.J. Univ. of Southern California Taichung Taiwan

ISBN: (纸本)0819416207

We propose a scale-limited signal model based on wavelet representation and study the reconstructability of scale-limited signals via extrapolation in this research. In analogy with the band-limited case, we define a scale-limited time-concentrated operator, and examine various vector spaces associated with such an operator. It is proved that the scale-limited signal space can be decomposed into the direct sum of two subspaces and only the component in one subspace can be exactly reconstructed, where the reconstructable subspace can be interpreted as a space consisting of scale/time-limited signals. Due to the ill-posedness of scale-limited extrapolation, a regularization process is introduced for noisy data extrapolation.

关键词： signal processing

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Automatic generation of implementations for DSP transforms on fused multiply-add architectures

Automatic generation of implementations for DSP transforms o...

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IEEE International Conference on Acoustics, Speech, and signal processing

作者： voronenko, Y Püschel, M Carnegie Mellon Univ Dept Elect & Comp Engn Pittsburgh PA 15213 USA

Many modern computer architectures feature fused multiply-add (FMA) instructions, which offer potentially faster performance for numerical applications. For DSP transforms, compilers can only generate FMA code to a very limited extent because optimal use of FMAs requires modifying the chosen algorithm. In this paper we present a framework for automatically generating FMA code for every linear DSP transform, which we implemented as an extension to the SPIRAL code generation system. We show that for many transforms and transform sizes, our generated FMA code matches the best-known hand-derived FMA algorithms in terms of arithmetic cost. Further, we present actual runtime results that show the speed-up obtained by using FMA instructions.

关键词： Computer architecture

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EFFECT OF RESAMPLING ON THE MUSIC ALGORITHM WHEN APPLIED TO INvERSE SYNTHETIC APERTURE RADAR

EFFECT OF RESAMPLING ON THE MUSIC ALGORITHM WHEN APPLIED TO ...

引用

CONF ON advanced signal processing algorithms, architectures, AND implementations 2

作者： NASH, G Defence Science and Technology Organization and Univ. of South Australia (Australia)

ISBN: (纸本)0819406945

Inverse synthetic aperture radar (ISAR) is a radar imaging method by which the rotation of a target is utilized to produce a two dimensional image. To achieve high resolution in both range and cross range, a series of stepped frequency waveforms are transmitted. These sample the target's radar response in frequency and time. Frequency transforms to time, which is proportional to range, and time transforms to doppler frequency, which is proportional to cross range. Therefore a two dimensional Fourier transform can be applied to the two dimensional data set to produce a radar image. However this is an approximation as the data is in a polar format, which only approximates a rectangular grid. Therefore resampling (interpolation) is required to change the grid from a polar to a rectangular format. The resampling in this case is straightforward. In an attempt to obtain higher resolution images, the Fourier transform has been replaced by the multiple signal classification (MUSIC) algorithm. The justification for this is that the targets of interest are manmade and so have sharp edges and corners. Therefore they consist of a number of corner reflectors with a background of continuous reflectors. The corner reflectors by their nature will generally give much stronger reflections, so one can with a certain degree of accuracy, approximate the ship as a collection of corner reflectors. Over the small change in aspect angle for which ISAR imaging is performed, corner reflectors can be approximated as point scatterers. This leads to the data being modeled as a collection of complex exponentials with added white Gaussian noise. The noise being due to thermal noise in the radar system. This type of data set is ideal for the two dimensional MUSIC algorithm. There are two major difficulties in applying the MUSIC algorithm to ISAR imaging. First, the MUSIC estimator is more sensitive to the sampling grid being polar than the Fourier transform is. Second, the resampling is less effect

关键词： Fourier transforms Radar Reflectors Computer simulations Interference (communication) Data modeling Detection and tracking algorithms Image resolution signal processing Transform theory

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On-line arithmetic for recurrence problems

On-line arithmetic for recurrence problems

引用

advanced signal processing algorithms, architectures, and implementations II

作者： Ercegovac, Milos D. Univ. of California/Los Angeles Los Angeles CA USA

An arithmetic-level approach to increasing computation rate in solving recurrence problems is discussed. The approach, based on on-line arithmetic principles, is discussed in problems such as root finding and recursiv... 详细信息

ISBN: (纸本)0819406945

关键词： signal processing

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