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IEEE International Conference on Systems, Man and Cybernetics

作者： R.S. Lynch P.K. Willett Signal Processing Branch Naval Undersea Warfare Center Newport RI USA Department of Electrical and Computer Engineering University of Connecticut Storrs CT USA

The Bayesian data reduction algorithm is applied to a collection of thirty real-life data sets primarily found at the University of California at Irvine's Repository of Machine Learning databases. The algorithm works by finding the best performing quantization complexity of the feature vectors, and this makes it necessary to discretize all continuous valued features. Therefore, results are given by showing the initial quantization of the continuous valued features that yields best performance. Further, the Bayesian data reduction algorithm is also compared to a conventional linear classifier, which does not discretize any feature values. In general, the Bayesian data reduction algorithm outperforms the linear classifier by obtaining a lower probability of error, as averaged over all thirty data sets.

关键词： signal processing algorithms Testing Bayesian methods Quantization Machine learning algorithms Error probability Military computing Machine learning Vectors spatial databases

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Secure blind image steganographic technique using discrete Fourier transformation

Secure blind image steganographic technique using discrete F...

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IEEE International Conference on Image processing

作者： F. Alturki R. Mersereau Department of Electronic Engineering College of Technological Studies Shuwaikh Kuwait Center for Signal and Image Processing Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

We present a new steganographic technique for covert communications. The technique embeds the hidden information in the DFT domain after permuting the image pixels in the spatial domain using a key. The permutation process introduces randomness into the cover image and results in a significant increase in the number of transform coefficients that can be used to transmit the hidden information. The hidden information is embedded using a quantization technique. The perceptual and statistical properties of the cover and the stego images remain similar for small quantization steps. The security of the system is examined against known stego attack.

关键词： Steganography Decorrelation Pixel Quantization Information security Cryptography Application software Frequency Image converters Educational institutions

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A space-time receiver for asynchronous DS-CDMA systems based on Kalman filter

A space-time receiver for asynchronous DS-CDMA systems based...

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Asilomar Conference on signals, Systems & computers

作者： Kun Wang Hongya Ge Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

ISBN: (纸本)0780365143

A new Kalman filter based space-time (S-T) receiver is proposed in this paper. By modeling an asynchronous CDMA system as a first-order state-space model, we can recursively obtain the finite-length linear minimum mean square error (LMMSE) receiver, which provides the best multiple access interference (MAI) cancellation among all the linear filters. Further interference suppression is provided by the spatial beam-former. The proposed receiver overcomes the near-far problem existing in the conventional joint S-T RAKE receiver. Simulation results demonstrate that the proposed Kalman filter based S-T receiver significantly outperforms the conventional joint S-T RAKE receiver.

关键词： Multiaccess communication Fading Multipath channels RAKE receivers Detectors Interference suppression Filters signal to noise ratio signal processing Multiple access interference

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A new adaptive algorithm for stereophonic acoustic echo canceller

A new adaptive algorithm for stereophonic acoustic echo canc...

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

作者： Yang-Won Jung Ji-Ha Lee Young-Cheol Park Dae-Hee Youn ASSP Laboratory Department of Electrical and Computer Engineering Yonsei University South Korea Center for Signal Processing Research Yonsei University South Korea

Stereophonic sound becomes more important in a growing number of hands-free applications where spatial realism is demanded. Such hands-free systems need stereophonic acoustic echo cancellers to reduce echoes that result from coupling between loudspeakers and microphones. In this paper, we propose a new adaptive algorithm for an stereophonic acoustic echo canceller based on human auditory properties and affine projection (AP) algorithm. The proposed algorithm employs a pre-processor generating speech-like noise to decorrelate the input signals without degrading perceptual speech quality. The decorrelation is based on the masking patterns of the human auditory system. By showing that the AP algorithm can be represented by a vector update as a combination of the Gram-Schmidt (GS) orthogonalization followed by the normalized LMS (NLMS) algorithm, the proposed adaptive algorithm integrates the pre-processor into the adaptive algorithm. Subjective listening test and computer simulation show the effectiveness of the proposed algorithm.

关键词： Adaptive algorithm Echo cancellers Humans Decorrelation Loudspeakers Microphones signal generators Acoustic noise Noise cancellation Noise generators

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A new fractal zerotree coding for wavelet image

A new fractal zerotree coding for wavelet image

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Meng Wu H.O. Ahmad M.N.S. Swamy Department of Telecom. Eng Nanjing University of Posts and Telecommunications Nanjing China Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

Based on the mechanisms underlying the performance of fractal and DWT, one method using fractal-based selfquantization coding approach to code different subband coefficients of DWT is presented. Within this method finer coefficients are fractal encoded according to the successive coarser ones. Self-similarities inherent between parent and their children at the same spatial location of the adjacent scales of similar orientation are exploited to predict variation of information across wavelet scales. On the other hand, with respect to the HVS model, we assign different error thresholds to different scales and different shape of range blocks to different orientations of the same scale, by which the perceptually lossless high compression ratio can be achieved and the matching processing can be quickened dramatically.

关键词： Fractals Image coding Iterative decoding Filter bank Discrete wavelet transforms Wavelet analysis Wavelet domain signal processing Telecommunication computing Shape

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Multiple-antenna diversity techniques for transmission over fading channels

Multiple-antenna diversity techniques for transmission over ...

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IEEE Conference on Wireless Communications and Networking

作者： B.A. Bjerke J.G. Proakis Communications And Digital Signal Processing Center Department of Electrical And Computer Engineering Northeastern University Boston MA USA

We consider wireless communication systems that employ multiple transmitting and receiving antennas to achieve spatial diversity and to increase the data rate through fading channels. In particular, we focus on a system with N transmitting antennas and M receiving antennas. We consider the design and performance evaluation of several detection algorithms for recovering the original data from the received signals on the M antennas. These algorithms include the optimum maximum likelihood detector and suboptimal reduced-complexity detectors such as the MMSE detector and a detector based on maximal ratio combining. We also consider coded systems.

关键词： Fading Maximum likelihood detection Receiving antennas Detectors Diversity reception Transmitting antennas Wireless communication signal design Algorithm design and analysis Detection algorithms

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temporal integration of loudness in listeners with sloping sensorineural hearing losses

Temporal integration of loudness in listeners with sloping s...

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Annual Northeast Bioengineering Conference

作者： S. Buus Communication and Digital Signal Processing Center Department of Electrical and Computer Engineering (409DA) Northeastern University Boston MA USA

temporal integration of loudness, as measured by the level difference between equally loud short and long tones, can be related directly to the loudness function if one assumes that ratio between equal-SPL long and brief tones is the same at all SPLs. This assumption is supported by measurements of temporal integration of loudness in listeners with gradual and abrupt high-frequency hearing losses. The amounts of temporal integration obtained in listeners with abrupt losses are larger than those obtained in listeners with gradual losses and in listeners with normal hearing. This finding is consistent with the slow growth of loudness with increasing intensity observed in listeners with abrupt losses.

关键词： Auditory system Deafness Loss measurement Testing Frequency Hair Digital signal processing Electric variables measurement Steady-state Feedback

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Two-dimensional model-based power spectrum estimation for nonextendible correlation bisequences

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CIRCUITS SYSTEMS AND signal processing 1997年第2期16卷 141-163页

作者： Boo, KJ Bose, NK Department of Electrical Engineering The Spatial and Temporal Signal Processing Center The Pennsylvania State University University Park

The extendibility of estimated correlation bisequences from an available sampled data array is described in terms of the generating functions of associated block Toeplitz with Toeplitz block (BTTB) matrices. The periodogram-based correlation bisequences are shown to be extendible. It is shown that the method of resultants and subresultants is convenient for generating the nonlinear constraints in the optimization problem which is solved iteratively for power spectrum estimation. A nontrivial example illustrates the concepts developed.

关键词： Spectrum analysis

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Invariance of stability properties of Hadamard and Szego product polynomials

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JOURNAL OF THE FRANKLIN INSTITUTE-engineering AND APPLIED MATHEMATICS 1997年第1期334B卷 41-46页

作者： Bose, NK Gregor, J Spatial & Temporal Signal Processing Center Department of Electrical Engineering The Pennsylvania State University University Park PA 16802 U.S.A.

It is shown that the integral representation of the Hadamard product operation of coefficient-wise multiplication of two polynomials, recently proved to keep the Hurwitz property invariant, provides interesting links to results in linear time-invariant discrete-time system theory. It is also pointed out that the invariance of the Schur property for stability of discrete-time systems, though known to be invalid under the Hadamard product operation, holds true under the operation composition. Various other related results on invariance are also included. Copyright (C) 1996 Published by Elsevier Science Ltd

关键词： Discrete time control systems

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Applications of space-time adaptive processing in wireless communications

Applications of space-time adaptive processing in wireless c...

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MILCOM, Military Communications Conference

作者： P.M. Haimovich A. Shah Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

This paper studies the application of space-time adaptive processing (STAP) to increase the performance of wireless communications. STAP applied to CDMA systems is an efficient means to increase the capacity by providing diversity paths to combat multipath and by suppressing interference through spatial-temporal filtering. STAP may also be used to harden commercial systems for military applications by rejecting narrowband interferences in overlay situations. The main advantage of interference suppression in the spatial domain is its robustness with respect to the interference bandwidth. The performance of several STAP architectures is reviewed. The performance of wireless systems with array processing or STAP is degraded by errors in the estimation of the covariance matrix due to finite sample effects. Full and reduced-rank methods are analyzed with respect to their robustness to finite sample effects.

关键词： Interference suppression Robustness Wireless communication Multiaccess communication Filtering Narrowband Bandwidth Array signal processing Degradation Estimation error

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