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Efficient computation of the DFT for some transform lengths that are not integral powers of two

Efficient computation of the DFT for some transform lengths ...

引用

Midwest Symposium on Circuits and Systems (MWSCAS)

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

In this paper, it is shown that radix-2 discrete Fourier transform algorithms can be designed for some transform lengths that are not integral powers of two. These algorithms reduce the overhead operations significantly compared with the mixed-radix algorithms. A specific algorithm is described in detail and its computational complexity and run-time performance are compared with the corresponding mixed-radix algorithm.

关键词： signal processing algorithms Discrete Fourier transforms Fourier transforms Algorithm design and analysis Runtime Power engineering computing Arithmetic Computational complexity Software performance Software algorithms

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Matrix factorization derivation and analysis of computational complexity of a new radix-2 DFT algorithm

Matrix factorization derivation and analysis of computationa...

引用

Midwest Symposium on Circuits and Systems (MWSCAS)

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

Recently, a new family of discrete Fourier transform algorithms has been reported in which the structural complexity is significantly reduced without affecting the arithmetic complexity. In the present paper, a radix-a algorithm of this family is derived using the matrix factorization approach. This approach is known to be useful in mapping algorithms to architectures. An analysis of the computational complexity of this algorithm is carried out. A run-time comparison of the proposed algorithm is made with the Cooley-Tukey radix-2 algorithm.

关键词： Computational complexity signal processing algorithms Discrete Fourier transforms Algorithm design and analysis Matrices computer architecture Equations Runtime Digital arithmetic Software performance

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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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Digital filter equalization of analog gain and phase mismatch in I-Q receivers

Digital filter equalization of analog gain and phase mismatc...

引用

International Conference on Universal Personal communications

作者： F. Harris Communications and Signal Processing Laboratory Department of Electrical and Computer Engineering San Diego State University San Diego CA USA

Gain and phase mismatch between the two signal processing paths of an I-Q receiver are responsible for artifacts which limit the dynamic range of a communication system. We describe and demonstrate a technique to adaptively balance the gain and phase of the I-Q paths with DSP based balancing loops which operate as background tasks while processing input data.

关键词： Digital filters signal processing Digital signal processing Frequency Sparse matrices Laboratories Dynamic range Gain Temperature Blind equalizers

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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...

引用

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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Reduced-state maximum-likelihood sequence detection for magnetic recording channels

Reduced-state maximum-likelihood sequence detection for magn...

引用

IEEE Workshop on Statistical signal and Array processing

作者： Jindong Li J.G. Proakis Center for Communication and Digital Signal Processing Department of Electrical and Computer Engineering Northeastern University Boston MA USA

ISBN: (纸本)0818675764

This paper is focused on the design of partial response equalized channels and maximum-likelihood sequence detection for high density magnetic recording systems. Methods for designing linearly equalized partial response channels are presented and applied to a Lorentzian model for the magnetic recording channel. Reduced-state maximum-likelihood sequence detection methods are employed for the partial response equalized channels and the error rate performances of the detectors are evaluated.

关键词： Maximum likelihood detection Magnetic recording Intersymbol interference Design methodology Error analysis Decision feedback equalizers Delay Noise reduction Finite impulse response filter Digital signal processing

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Hierarchical neural network for multiresolution image analysis

Hierarchical neural network for multiresolution image analys...

引用

IEEE International Conference on Image processing

作者： M.S. Pereira E.S. Manolakos Communications and Digital Signal Processing (CDSP) Center for Research and Graduate Studies Department of Electrical and Computer Engineering Northeastern University Boston MA USA Northeastern University Boston MA US

We propose an architecture for multiresolution classification based on a wavelet decomposition and a hierarchical neural network. Each layer of the neural network is a "frequency expert" associated with a single frequency channel. Higher layers in the hierarchy integrate the information provided by the layers below, leading to a network where different "experts" cooperate to explain the input data. We illustrate the performance of this architecture on edge detection, a problem which is well known to be best addressed in a multiresolution framework.

关键词： Neural networks Image resolution Image analysis Image edge detection Frequency signal resolution Image motion analysis Image texture analysis signal processing algorithms Pixel

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Spread spectrum PR-QMF transmultiplexer codes for CDMA communications

Spread spectrum PR-QMF transmultiplexer codes for CDMA commu...

引用

IEEE Digital signal processing Workshop

作者： A.N. Akansu X.M. Lin M.V. Tazebay Department of Electrical and Computer Engineering Center for Communications and Signal Processing Reasearch New Jersey Institute of Technology Newark NJ USA New Jersey Institute of Technology Newark NJ US

Orthogonal transmultiplexers have been successfully utilized for multiple access communications. They are of FDMA type in their most common version. The frequency selective PR-QMFs were used in transmultiplexers for CDMA communications reported in the literature. This conflicts with the fundamentals of CDMA theory. We introduce novel spread spectrum PR-QMF codes. It is shown that the spread spectrum PR-QMF codes with minimized auto- and cross-correlation properties drastically outperform the conventional Gold (1967) codes in CDMA communication scenarios considered.

关键词： Spread spectrum communication Multiaccess communication Gold Frequency domain analysis Multiple access interference Frequency division multiaccess Bit error rate signal processing Frequency conversion OFDM modulation

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Performance analysis of direct sequence spread spectrum communications system employing interference excision

Performance analysis of direct sequence spread spectrum comm...

引用

IEEE Digital signal processing Workshop

作者： M.V. Tazebay A.N. Akansu New Jersey Institute of Technology Newark NJ US New Jersey Institute of Technology Department of Electrical and Computer Engineering Center for Communications and Signal Processing Research Newark NJ USA

It is well known that a proper interference exciser enhances the performance of a spread spectrum communications system. There have been several competing excision techniques reported in the literature. This paper presents a performance evaluation of those excision techniques via the analytical and computer simulation tools. It is found that the analytical performance tools presented are in match with the computer simulation results. It is also shown that a previously proposed adaptive time-frequency exciser consistently outperforms the existing interference excision techniques in the literature.

关键词： Performance analysis Spread spectrum communication Interference Narrowband Bandwidth Time frequency analysis Detectors Communication systems Transmitters Stochastic processes

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Focalization in the Gulf of Mexico

Focalization in the Gulf of Mexico

引用

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

作者： Z.-H. Michalopoulou M.B. Porter Department of Mathematics and Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA Department of Matheimatics and Center for Communications and Signal Processing New Jersey Institute of Technology Newark NJ USA

Matched-field processing (MFP) has been an active area of research in the last decade for estimating the location of a sound source and parameters related to the ocean channel. MFP yields estimates of the unknown parameters by matching the true received acoustic field to the theoretically predicted field calculated for sets of likely values for the unknown parameters. Successful demonstrations of the application of MFP to real data have been limited. Here, MFP is shown to provide both successful localization and focusing of the environment ('focalization') with real data collected in the Gulf of Mexico. The estimation is done by maximizing the correlation between the received and expected signals using simulated annealing.

关键词： Oceans Sonar equipment Marine technology signal processing Pulse shaping methods Contracts Sea surface Mathematics Yield estimation Simulated annealing

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