检索结果-内蒙古大学图书馆

Asilomar Conference on signals, Systems & computers

作者： Hsing-Hsing Chiang C.L. Nikias Department of Electrical and Computer Engineering Communications and Digital Signal Processing (CDSP) Center for Research and Graduate Studies Northeastern University Boston MA USA

A new adaptive scheme for time delay estimation is introduced for signal environments where the signal is non-Gaussian and the additive noise sources are spatially correlated Gaussian with unknown power spectrum characteristics. The new scheme is based on parametric modeling between two sensor measurements and employs higher-order statistics (third- or fourth-order) of the data. An analytic asymptotic performance evaluation of the errors of the model parameters obtained by the new method is provided. It is demonstrated by means of extensive simulations that the new adaptive scheme works well for both stationary and nonstationaxy cases. As expected, it outperforms the cross- correlation-based gradient method for time delay adaptation in spatially correlated Gaussian noises. The new scheme is also compared with the overdetermined recursive instrumental variable method and shown to exhibit substantially less computational complexity.

关键词： Delay effects Delay estimation Additive noise signal processing Biomedical measurements Digital signal processing Gaussian noise Radar tracking Biosensors Time measurement

来源：评论

学校读者我要写书评

暂无评论

Experimental analysis of SIMD recursive digital filtering on the PASM system prototype

Experimental analysis of SIMD recursive digital filtering on...

引用

IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： M.J. McPheters T.L. Casavant Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA Parallel Processing Laboratory School of Electrical Engineering Purdue University West Lafayette IN USA

Experimental analyses of an implementation of an SIMD algorithm for recursive digital filtering using the partitionable SIMD/MIMD (PASM) parallel processing system prototype at Purdue University are presented. The algorithm used easily generalizes to use N processing elements (PEs). Timing-based analyses are made based on a four-PE version by examining the following constituent execution times: microcontroller execution time, PE execution time, broadcast communication time, and the execution time of five additional phases in the recursive digital filtering summation calculation. Broadcast execution time was found to account for roughly 44% of the total execution time, and the implication of this is discussed for larger problem sizes and machine sizes. The total measured execution time is verified through summation of execution times for the various components of the algorithm.< >

关键词： Digital filters Prototypes Filtering algorithms Parallel processing Partitioning algorithms Algorithm design and analysis Analytical models Performance analysis Laboratories Communication system control

来源：评论

学校读者我要写书评

暂无评论

A frequency domain inverse solution in electrocardiography

A frequency domain inverse solution in electrocardiography

引用

Annual Northeast Bioengineering Conference

作者： D.H. Brooks C.L. Nikias J.H. Siegel Department of Electrical and Computer Engineering Communications and Digital Signal Processing Center Northeastern University Boston MA USA MIEMSS University of Maryland Baltimore MD USA

Recent advances in the development of detection schemes for myocardial ischemia which use frequency-domain parameters as detection statistics open up the possibility of using frequency-domain methods in the inverse problem of electrocardiography. The application of the minimum relative entropy (MRE) reconstruction principle to this problem is considered and its theoretical justification is given. The MRE method is compared to a standard time-domain least-squares method, constrained least squares (CLS). Initial results indicate that the MRE method promises to be able to overcome limitations of the time-domain least-squares methods which tend to make the latter difficult to apply in a clinical setting.< >

关键词： Frequency domain analysis Electrocardiography Inverse problems Torso Least squares methods Heart Humans Solid modeling Animals Anatomy

来源：评论

学校读者我要写书评

暂无评论

Harmonic decomposition methods in cumulant domains (array processing)

Harmonic decomposition methods in cumulant domains (array pr...

引用

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

作者： R. Pan C.L. Nikias Communications and Digital Signal Processing Center for Research and Graduate Studies Department of Electrical Engineering Northeastern University Boston MA USA Communications and Space Sciences Laboratory Department of Electrical Engineering Northeastern University Boston MA USA

The authors address the bearing estimation problem of sources from array data (snapshots) in the presence of Gaussian color (spatially correlated) noises of unknown autocorrelation matrix. They demonstrate that the harmonic decomposition methods (signal and noise subspace) can easily be reformulated using fourth-order cumulant matrices instead of autocorrelations. Simulation results are presented and comparisons are made to show that the performance of the fourth-order cumulant-based methods (beamforming, MUSIC) is superior to that of their equivalent autocorrelation-based methods when the additive noise sources are colored Gaussian with unknown correlation matrix.< >

关键词： Array signal processing Sensor arrays Autocorrelation Colored noise Matrix decomposition Additive noise Gaussian noise Direction of arrival estimation Multiple signal classification Phased arrays

来源：评论

学校读者我要写书评

暂无评论

The complex form of a fast algorithm for frequency estimation

The complex form of a fast algorithm for frequency estimatio...

引用

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

作者： Z. Banjanin J.R. Cruz Cooperative Institute for Mesosclae Meteorogical Studies University of Oklahama Norman OK USA Communication and Signal Processing Laboratory School of Electrical engineering and Computer Science University of Oklahama Norman OK USA

A complex form of a fast frequency estimation technique based on the quotient-difference (QD) algorithm is presented. The complex stochastic process is modeled as a sum of nonharmonically related damped exponentials. This algorithm computes the zeros of the predictor polynomial in a single step, directly from the data and has computational complexity on the order of Np.< >

关键词： Frequency estimation signal processing algorithms Polynomials Parameter estimation Equations Meteorology Laboratories computer science Parametric statistics Prediction algorithms

来源：评论

学校读者我要写书评

暂无评论

Optimal Design Of Pulse Shapes By Means Of Constrained Criteria

Optimal Design Of Pulse Shapes By Means Of Constrained Crite...

引用

Asilomar Conference on signals, Systems & computers

作者： R.A. Nobakht M.R. Civanlar S.H. Ardalan Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA AT and T Bell Laboratories Inc. Middletown NJ USA

A primary concern in the early days of pulse shaping was the construction of an analog circuit to generate the optimal pulse shape, and this has been a limiting constraint. With the recent developments in the DSP hardware, however, it is possible to use almost any pulse shape for digital data transmission. This resulted in a search for design algorithms capable of constructing pulse shapes matching to the properties of a given channel. Such properties can be translated to certain constrained criteria in the design of pulse shapes. The projection onto convex sets technique is suitable for the solution of this problem particularly because of its flexibility in modeling a variety of constraints. The use of the technique for the optimal pulse design problem is demonstrated through a detailed example from power line communications.

关键词： Pulse shaping methods Shape Finite impulse response filter signal processing algorithms Pulse circuits Digital signal processing Hardware Intersymbol interference Constraint optimization IIR filters

来源：评论

学校读者我要写书评

暂无评论

Optimal pulse shape design using projections onto convex sets

Optimal pulse shape design using projections onto convex set...

引用

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

作者： M.R. Civanlar R.A. Nobakht AT and T Bell Laboratories Inc. Middletown NJ USA Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

Recent development in digital signal processing (DSP) hardware has made it possible to use almost any pulse shape for digital data transmission, resulting in a search for design algorithms capable of constructing pulse shapes matching the properties of a given channel. The technique of projection onto convex sets is particularly suitable for the solution of this problem because of its flexibility in modeling a variety of constraints. The use of the technique for the optimal pulse design problem is demonstrated through by an example from power line communications.< >

关键词： Pulse shaping methods Shape Digital signal processing Finite impulse response filter signal processing algorithms Hardware Pulse generation IIR filters Data communication Power line communications

来源：评论

学校读者我要写书评

暂无评论

A NEW ALGORITHM FOR ADAPTIVE ARRAYS

引用

IEEE TRANSACTIONS ON ACOUSTICS SPEECH AND signal processing 1987年第9期35卷 1314-1319页

作者： GARDNER, WA BROWN, WA Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California슠Davis Davis CA USA Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Davis Davis CA USA

A new deflected stochastic-gradient algorithm for adaptive sensor arrays is introduced. It is shown to have the capability of converging substantially faster than the nondeflected stochastic gradient (LMS) algorithm but slower than the recursive least squares (RLS) algorithm. Because of its amenability to reduction of computational complexity by data quantization, it has the potential for processing digital signals with bandwidths one to two orders of magnitude larger than the bandwidths manageable with the RLS algorithm for sensor arrays containing a number of adjustable weights in the approximate range of 10-50.

关键词： Adaptive arrays Sensor arrays Least squares approximation Resonance light scattering Bandwidth Stochastic processes Least squares methods Computational complexity Quantization signal processing

来源：评论

学校读者我要写书评

暂无评论

SPECTRAL CORRELATION OF MODULATED signalS - .1. ANALOG MODULATION

引用

IEEE TRANSACTIONS ON COMMUNICATIONS 1987年第6期35卷 584-594页

作者： GARDNER, WA Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Davis CA USA

The importance of the concept of cyclostationarity in design and analysis of signal detectors, synchronizers, and extractors in communication systems is briefly discussed, and the central role of spectral correlation, in the characterization of random processes that are cyclostationary in the wide sense, is explained. A spectral correlation function that is a generalization of the power spectral density function is described, and a corresponding generalization of the Wiener-Khinchine relation and several other fundamental spectral correlation relations also are described. Explicit formulas for the spectral correlation function for various types of analog-modulated signals are derived. This includes pulse and carrier amplitude modulation, quadrature amplitude carrier modulation, and phase and frequency carrier modulation. To illustrate the differing spectral correlation characteristics of different modulation types, the magnitudes of the spectral correlation functions are graphed or described in graphical terms as the heights of surfaces above a bifrequency plane.

关键词： Pulse modulation Amplitude modulation Phase modulation Quadrature amplitude modulation signal design signal analysis signal processing signal detection Detectors Frequency synchronization

来源：评论

学校读者我要写书评

暂无评论

SPECTRAL CORRELATION OF MODULATED signalS .2. DIGITAL MODULATION

引用

IEEE TRANSACTIONS ON COMMUNICATIONS 1987年第6期35卷 595-601页

作者： GARDNER, WA BROWN, WA CHEN, CK Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Davis CA USA

As a continuation of Part I, the spectral correlation function is presented for a variety of types of digitally modulated signals. These include digital pulse-amplitude, pulse-width, and pulse-position modulation, and various types of phase-shift keying and frequency-shift keying. The magnitudes of the spectral correlation functions are graphed as the heights of surfaces above a bifrequency plane, and these graphs are used as visual aids for comparison and contrast of the spectral correlation properties of different modulation types.

关键词： Digital modulation Space vector pulse width modulation signal processing Pulse modulation Phase shift keying Frequency shift keying Pulse width modulation Filters Matrices Parameter estimation

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：