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Joint direction finding, signal and channel response estimation for a polynomial phase signal in a multipath channel

Joint direction finding, signal and channel response estimat...

引用

Asilomar Conference on signals, Systems & computers

作者： A. Zeira B. Friedlander Signal Processing Technology Limited Palo Alto CA USA Department Electrical & Computer Engineering University of California Davis CA USA

In this paper we study the joint estimation of the direction-of-arrival (DOA), signal and channel parameters for an unknown polynomial phase signal in a multipath channel. We derive the Cramer Rao bound (CRB), and use it to study the dependence of the optimal performance on the SNR, and the spatial and temporal separation, of the different paths. Finally, we compare the optimal DOA estimation performance to the performance achievable by several suboptimal estimators, and to the performance achievable in the presence of a single propagation path.

关键词： Phase estimation Polynomials Direction of arrival estimation signal processing Frequency Multipath channels Cramer-Rao bounds Delay effects Delay estimation Amplitude estimation

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Interpolated array minimum variance beamforming for correlated interference rejection

Interpolated array minimum variance beamforming for correlat...

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

作者： A. Zeira B. Friedlander Signal Processing Technology Limited Palo Alto CA USA Department of Electrical and Computer Engineering University of California Davis CA USA

signal cancellation causes the performance of conventional adaptive beamformers to severely deteriorate in environments containing interference sources that are correlated with the signal. We propose an algorithm which overcomes the signal cancellation problem for wideband signals. The proposed algorithm applies array manifold interpolation to perform frequency domain averaging, which reduces the correlation between the signals and the interference sources. In contrast to other algorithms that apply frequency averaging, the algorithm proposed does not require any preliminary estimation or prior information on the interference environment.

关键词： Array signal processing signal processing algorithms Sensor arrays Wideband Interference cancellation Frequency estimation Covariance matrix Adaptive signal processing Interpolation Frequency domain analysis

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Image compression with singularity preservation

Image compression with singularity preservation

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： A. Langi W. Kinsner Department of Electrical and Computer Engineering Signal and Data Compression Laboratory and TRLabs University of Manitoba Winnipeg MAN Canada

This paper presents a new approach to lossy image compression through singularity preservation to obtain high compression ratios. The concept of this approach is based on a conjecture that image singularities carry most of the perceptual information, hence the essential part of an image should be represented by its singularity as opposed to its energy alone. Wavelet maxima have been chosen to represent signal singularity because of their ability to characterize image singularity fully. There are algorithms to reconstruct the original image faithfully from wavelet maxima. A compression scheme can then be designed to reduce the bit rate while preserving singularities. The resulting low bit-rate image has sharp edges without distortions, such as blockiness or blurs. This approach has been used to compress aerial ortho images, in which the perceptual quality of a 27 peak signal-to-noise ratio (PSNR) singularity-preserving image outperforms that of a 30 dB PSNR energy-preserving joint-photographic expert group (JPEG) image at a 15:1 compression ratio.

关键词： Image coding Image reconstruction PSNR Pixel Humans Transform coding Wavelet transforms Image storage Data compression Laboratories

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Orthogonal trans multiplexer: A multiuser communications platform from FDMA to CDMA

Orthogonal trans multiplexer: A multiuser communications pla...

引用

European signal processing Conference (EUSIPCO)

作者： Ali N. Akansu Mehmet V. Taztbay New Jersey Institute of Technology Department of Electrical and Computer Engineering Center for Communications and Signal Processing Research University Heights Newark NJ 07102

Orthogonal transmultiplexers have been successfully utilized for multi-user communications. They are of the FDMA type in their most common version. Mostly, frequency-selective PR-QMFs were used in transmultiplexers as orthogonal user codes for CDMA communications reported in the literature. This conflicts with the fundamentals of CDMA theory. We introduce novel M-valued spread spectrum PR-QMF codes in this paper. It is shown that the proposed M-valued spread spectrum PR-QMF codes with minimized auto- and cross-correlation properties outperform the conventional Gold codes in CDMA communication scenarios considered in the paper.

关键词： Filter banks Gold Time-frequency analysis Frequency division multiplexing Frequency division multiaccess

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Equalizer and detector performance in digital VCRs

Equalizer and detector performance in digital VCRs

引用

IEEE International Conference on Communications (ICC)

作者： Younggyun Kim Jaekyun Moon Soon Tae Kim Yong Deok Jang Sun Tae Lee Department of Electrical Engineering University of Minnesota Minneapolis MN USA Signal Processing Laboratory Samsung Electronics Corporation Limited Suwon South Korea

Various equalization and detection techniques are considered for the digital video cassette recorder (DVCR) application. Bit error rate (BER) performances are evaluated based on computer simulation. The equalization/detection schemes considered are class IV partial response equalisation followed by Viterbi algorithm detection (PR4/VA), extended class IV combined with VA detection (EPR4/VA), decision feedback equalization (DFE) and fixed-delay tree search with decision feedback (FDTS/DF). For all cases, the rate 24/25 modulation DC-controlled channel code is used. The BER simulations are performed at different channel SNR values and in the presence of off-track, head-tape space variations and sampling phase error. The results show that the FDTS/DF with a search depth of 3 has significant performance advantage and improved robustness over other schemes under various channel conditions.

关键词： Detectors Video recording Decision feedback equalizers Bit error rate Application software Performance evaluation computer simulation Viterbi algorithm Modulation coding Sampling methods

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Data-adaptive algorithms for signal detection in impulsive noise modeled as a subGaussian, alpha-stable process

Data-adaptive algorithms for signal detection in impulsive n...

引用

IEEE Workshop on Statistical signal and Array processing

作者： G.A. Tsihrintzis C.L. Nikias Communication Systems Laboratory Department of Electrical Engineering University of Virginia Charlottesville VA USA Signal and Image Processing Institute Department of Electrical Engineering-Systems University of Southern California Los Angeles CA USA

We address the problem of coherent detection of a signal embedded in heavy-tailed noise modeled as a subGaussian, alpha-stable process. We assume that the signal is a complex-valued vector of length L, known only within a multiplicative constant. The dependence structure of the noise, i.e., the underlying matrix of the sub Gaussian process, is not known. The intent is to implement a generalized likelihood ratio detector which employs robust estimates of the unknown noise underlying matrix and the unknown signal strength. The performance of the proposed adaptive detector is compared to that of an adaptive matched filter that uses Gaussian estimates of the noise underlying matrix and the signal strength and is found to be clearly superior. The proposed new algorithms an evaluated via Monte-Carlo simulation.

关键词： signal detection Interference signal processing signal processing algorithms Detectors Gaussian noise signal design Probability distribution Image processing Noise robustness

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Efficient polynomial transformation algorithms for multidimensional systems formulated in {s,z,/spl gamma/} variables

Efficient polynomial transformation algorithms for multidime...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： H.C. Reddy I-Hung Khoo G.S. Moschytz A.R. Stubberud Department of Electrical and Computer Engineering University of California Irvine CA USA Department of Electrical Engineering California State University Long Beach CA USA Institute of Signal and Information Processing ETH Zurich Zurich Switzerland

Discrete-time systems using /spl delta/-operator instead of shift operator are being studied vigorously in view of the many numerical advantages they provide. In the design of discrete-time filters, polynomial transformations from continuous-time systems play an important role. This paper would present efficient tabular algorithms to perform polynomial transformation between continuous-time {s-variable}, /spl delta/-DT {/spl gamma/-variable} and q-DT {z-variable} systems. Both 1-D and 2-D cases are considered.

关键词： Polynomials Multidimensional systems signal processing Information processing USA Councils Filters Discrete transforms Stability analysis Algorithm design and analysis

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A system for vehicle classification from range imagery

A system for vehicle classification from range imagery

引用

Southeastern Symposium on System Theory

作者： Shiquan Peng C.A. Harlow Department of Electrical and Computer Engineering and Remote Sensing and Image Processing Laboratory Louisiana State University Baton Rouge LA USA

ISBN: (纸本)0818673524

In this project we consider automated vehicle location and classification systems. Current systems which utilize loop detectors or video cameras have deficiencies. Video based systems are sensitive to environmental conditions and do not perform well in vehicle classification. The new generation of range or distance sensors that are being developed offer the promise of sensors which are not sensitive to lighting conditions and provide information which should give better vehicle detection and classification percentages than current systems. The focus of this project is to develop an automated vehicle location and classification system based upon imagery obtained from range sensors. Image analysis operators and classification methods are developed for vehicle classification. Preliminary results indicate that accurate vehicle classification can be obtained.

关键词： Vehicle detection Radar detection Sensor systems Costs Infrared detectors Laser radar Image processing Road transportation Machine vision Surveillance

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Closed loop heart beat interval modelization in humans using mean blood pressure, instantaneous lung volume and muscle sympathetic nerve activity

Closed loop heart beat interval modelization in humans using...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： P. Celka R. Vetter U. Scherrer E. Pruvot Department of Electrical Engineering Signal Processing Laboratory Swiss Federal Institute of Technology Lausanne Switzerland Department of Internal Medicine and Division of Cardiology University Hospital Lausanne Switzerland

Considering a closed loop model of the cardiovascular system, the authors develop accurate multi-input linear and nonlinear approaches for estimation of the heart beat interval time series using mean arterial blood pressure (MABP), instantaneous lung volume (ILV) and muscle sympathetic nerve activity (MSNA). The nonlinear model proved to be more adequate compared to the linear one, with respiration being the most nonlinear component of the system.

关键词： Heart beat Humans Blood pressure Lungs Muscles Low pass filters Cardiology Cardiovascular system Arterial blood pressure Transfer functions

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Scheduling VBR traffic for achievable QoS in a shared un-buffered environment

Scheduling VBR traffic for achievable QoS in a shared un-buf...

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International Conference on Universal Personal Communications

作者： J.M. Capone L. Stavralalcis Communications and Digital Signal Processing (CDSP) Center Department of Electrical and Computer Engineering Northeastern University Boston MA USA Northeastern University Boston MA US

A system of T resources (wireless channels) shared by a number of un-buffered applications is considered. The shared transmission resources are defined to be the slots (packet transmission times) of a TDMA frame (service cycle). Packets which are not allocated a channel within the current service cycle are dropped. The quality of service (QoS) vector is equivalently described in terms of (diverse) packet dropping probabilities (p/sub i/), or (diverse) packet dropping rates (d/sub i/). From a precisely defined region of achievable QoS vectors, easy to implement scheduling policies that deliver the achievable QoS vectors are derived. As an example, a policy that delivers a target QoS vector is derived; its performance is verified through simulations.

关键词： Quality of service Bit rate Resource management Wireless LAN Monitoring Processor scheduling signal processing Application software Operating systems Delay effects

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