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Index mapping approach of deriving the PM DFT algorithms

Index mapping approach of deriving the PM DFT algorithms

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： D. Sundararajan M.O. Ahmad Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

The DFT is of fundamental importance in many areas of science and engineering due to its efficient evaluation of frequently used operations such as signal analysis, convolution, and correlation. It has been shown that radix-2 DFT (discrete Fourier transform) algorithms can be designed based on vector representation of data providing several advantages. These algorithms provide more efficient solution for the problem of DFT computation. An index mapping approach is used to derive these algorithms. This approach makes the derivation simpler and provides a better insight into the functioning of the algorithms. The signal flow graph of the algorithm is also presented.

关键词： Equations Transforms

来源：评论

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Traffic modeling in a multi-media environment

Traffic modeling in a multi-media environment

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： S.N. Subramanian Tho Le-Ngoc Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

Proposes a new model for characterizing the data traffic in a multi-media environment. The authors model the data traffic by a two-state doubly stochastic Poisson process, with sojourn times in each state having an independent and identical heavy tailed distribution, such as the Pareto distribution. The simulation results from the new data traffic model are presented. The new model is versatile in capturing the self-similar characteristics of traffic found in the traffic measurements. The authors also suggest that the other two types of multi-media traffic namely, voice and video may each be characterized by a 2-state doubly stochastic Poisson process with exponential sojourn times (i.e., a Markov modulated Poisson process or MMPP).

关键词： Traffic control Multimedia communication Stochastic processes Packet switching Telecommunication traffic Communication system traffic control signal processing Electronic mail B-ISDN Jitter

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Objective measurement of image impairments. Blocking, blurring, and spatial edge noise

Objective measurement of image impairments. Blocking, blurri...

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： W.W. Bishtawi W.E. Lynch Center of Signal Processing and Communications Department of Electrical & Computer Engineering Concordia University Montreal QUE Canada

The impairment detection method (IDM) is proposed. It is an objective measurement technique of subjective image quality. Given the original and reproduced image as inputs, both images are divided into three areas: flat area, texture area, and sharp edge area. Features are extracted from each area using gradient vector block analysis. The IDM produces three output parameters that measure blocking distortion, blurring, and spatial edge noise.

关键词： Noise measurement Distortion measurement Image coding Image quality Humans Histograms Pixel signal processing Measurement techniques Mean square error methods

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Shape equalization of binary images using Fourier descriptor interpolation in low-level processing for image understanding

Shape equalization of binary images using Fourier descriptor...

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： M. Macieszczak M.O. Ahmad Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

One of the most essential tasks in the image understanding systems is shape analysis of the binary images. The effectiveness of the shape analysis process requires an accurate description of the shape of the object and an appropriate structure of the input data. In this paper, a new method of the shape equalization is presented. The proposed approach increases the accuracy of the shape description without increasing the complexity of the input information. The method is based on the data interpolation using Fourier descriptors and takes advantage of the statistical properties of the objects found in image scenes. A 1-D filter is used for spatial filtering of the contours.

关键词： Shape Interpolation Layout Image sampling Frequency signal processing computer vision Image analysis Filters Filtering

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An adaptive fractal-based algorithm for image compression

An adaptive fractal-based algorithm for image compression

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： B. Dzerdz M.O. Ahmad Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

The use of fractal theory in the area of image compression is a relatively new and intriguing concept. Its theoretical basis is well established in the theory of iterated function systems, and particularly in partitioned iterated function systems. However, there are still numerous questions about its practical implementation to be answered. The main problem with this method is that of reducing the complexity of an otherwise very promising concept. We describe a simple and efficient adaptive fractal-based algorithm for image compression. The algorithm uses horizontal-vertical (HV) partitioning of an image into rectangular blocks of different sizes. The partitioning information is used in the encoding process for determining both the range and the domain image blocks. Neither the ranges nor the domains are determined in advance. Instead, the image is fully partitioned into small areas not larger than some predetermined size. The ranges and the corresponding domains are then determined in an adaptive manner, by comparing the rectangular image blocks with different scales. The proposed algorithm attempts to find a good cover for the ranges as large as possible and it then proceeds toward smaller ranges only if an optimal cover is not found with the larger scale. The method allows the total number of finally chosen ranges to be reduced, which is an essential requirement for achieving high compression ratios. The proposed algorithm gives roughly one-half the number of ranges compared to that given by the quad-tree based partitions yielding significant improvement in the compression ratio.

关键词： Fractals Image coding signal processing algorithms Partitioning algorithms Adaptive signal processing Image converters

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A new design of switched-current IIR filters

A new design of switched-current IIR filters

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： Shenghong Wang M.O. Ahmad Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

A new design of a switched-current IIR filter using digital filter synthesis is described. The filter consists of unit delays, coefficient multipliers and adders. The design methodology is simple and it gives filters whose structure is very regular. The methodology is very suitable for programmable filter design and design automation. As an example, a second-order IIR filter is designed employing the developed technique and it is implemented using a new high accuracy differential switched-current memory cell.

关键词： IIR filters Circuits Digital filters Design automation Voltage Switches Communication switching signal processing signal synthesis Delay

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electrical imaging of cardiac activity

Electrical imaging of cardiac activity

引用

Electro

作者： D.H. Brooks Communications and Digital Signal Processing Center Department of Electrical and Computer Engineering Northeastern University Boston MA USA

We describe a methodology for a systematic approach to the processing of measurements of electrical potentials which originate in cardiac electrical activity. This methodology can be seen as an imaging modality whose goal is the display and interpretation of an image of the electrical activity of the heart. It requires the display and analysis of electric field data as a function of time and space on complex, irregular three-dimensional geometries. This imaging modality does not reconstruct anatomy, but rather it uses an anatomical model as a basis with which to analyze physical quantities originating in the heart. The goals of this analysis are to achieve a better understanding of normal and abnormal electrical activity of the heart and to apply this knowledge to the diagnosis and monitoring of patients.< >

关键词： Heart Electric variables measurement Electric potential Electrocardiography Inverse problems Image analysis Torso Conductors Density measurement signal processing

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Parallel computation of higher order moments on the MasPar-1 machine

Parallel computation of higher order moments on the MasPar-1...

引用

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

作者： J.N. Kalamatianos E.S. Manolakos Communications and Digital Signal Processing Center Electrical and Computer Engineering Department Northeastern University Boston MA USA

The design of efficient parallel processing implementations for speeding up the computationally intensive estimation of higher order statistics (HOS) has been recognized as an important task by the signal processing community. We report on the synthesis of minimum running time (latency) data-parallel algorithms that can be employed to compute all moment lags, up to the 3rd or 4th-order, on the MasPar-1 single instruction multiple data (SIMD) parallel system. By construction the synthesized SIMD algorithms require constant memory per processing element (PE), thus allowing the processing of 1-D input data sequences with as many as M=2/sup 10/ data samples. Simulation results are presented showing the gain in speedup and execution times, as compared to optimized versions of the serial estimation algorithm running in powerful workstations.

关键词： Concurrent computing signal processing algorithms Parallel processing Recursive estimation Digital signal processing Delay Design engineering signal design Higher order statistics computer aided instruction

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Adaptive multiuser bootstrapped decorrelating CDMA detector for one-shot asynchronous unknown channels

Adaptive multiuser bootstrapped decorrelating CDMA detector ...

引用

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

作者： Y. Bar-Ness N. Sezgin Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

Vast research was recently performed on signal detection of multiuser code division multiple access (CDMA). Particularly for uplink (users to base station) the signals are asynchronous and the near-far problem is an important issue to deal with. All near-far resistant detectors, adaptive or non-adaptive, assume knowledge of the relative delays of the different users signals. Among these are the one-shot detectors suggested by Verdu. In this paper we suggest an adaptive algorithm to decorrelate the outputs of the one shot matched filters that assumes no knowledge of the relative delay. The performance of this approach is shown to be better than the non-adaptive "zero-forcing" method previously used and which implements linear transformation via the inverse of matched filters output cross-correlation. For simplicity a two-user case is presented. Extension to a higher number of users is relatively simple.

关键词： Decorrelation Multiaccess communication Detectors Delay Matched filters Adaptive signal detection Impedance matching Multiple access interference Power control Adaptive signal processing

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Efficient simulation of cell loss probability using standardized ATM connection traffic descriptors

Efficient simulation of cell loss probability using standard...

引用

IEEE International Conference on communications (ICC)

作者： J.A. Freebersyser J.K. Townsend Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

In ATM networks, the purpose of connection admission control is to decide if allowing a new connection into the network violates a quality of service measure, such as the cell loss probability. Testing the algorithms that perform connection admission control is difficult because of the complexity of the ATM switches, the low cell loss probabilities required by ATM networks, and the unwieldiness of matching statistical models of the traffic entering the network to the connection traffic descriptors used by the call admission control algorithm. In the paper, instead of using statistical traffic models, the authors describe the traffic entering the network by the connection traffic descriptors standardised by the ATM Forum. They develop a simulation model for estimating the cell loss probability, derive upper and lower bounds on the cell loss probability, use importance sampling to increase the efficiency of the simulation, and find an analytical solution for the improvement in simulation efficiency. For the examples considered they obtained 3 to 9 orders of magnitude improvement in efficiency compared to conventional Monte Carlo simulation.

关键词： Communication system traffic control Traffic control Asynchronous transfer mode Probability Analytical models Admission control Quality of service Loss measurement Testing Performance evaluation

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